CN115268008A

CN115268008A - Variable-focus camera module

Info

Publication number: CN115268008A
Application number: CN202110489175.3A
Authority: CN
Inventors: 赵波杰; 黄桢; 阙嘉耀; 叶林敏; 方银丽; 傅强; 洪超; 袁栋立
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2022-11-01
Anticipated expiration: 2041-04-30
Also published as: CN115268008B

Abstract

The utility model discloses a module of making a video recording of can zooming, wherein, the module of making a video recording of can zooming adopts novel piezoelectric actuator as the driver to satisfy the demand of zooming of the module of making a video recording of can zooming. And moreover, the piezoelectric actuators are arranged in the variable-focus camera module by adopting a reasonable arrangement scheme so as to further meet the requirements on the structure and the size of the variable-focus camera module.

Description

Variable-focus camera module

Technical Field

The utility model relates to a module field of making a video recording especially relates to the module of making a video recording of can zooming, wherein, the module of making a video recording of can zooming adopts neotype piezoelectric actuator to satisfy as drive element the demand of zooming of the module of making a video recording of can zooming. And moreover, the piezoelectric actuators are arranged in the variable-focus camera module by adopting a reasonable arrangement scheme so as to further meet the requirements on the structure and the size of the variable-focus camera module.

Background

With the popularization of mobile electronic devices, technologies related to camera modules used in mobile electronic devices for helping users acquire images (e.g., videos or images) have been rapidly developed and advanced, and in recent years, camera modules have been widely used in many fields such as medical treatment, security, industrial production, and the like.

In order to meet the increasingly wide market demands, high pixels, large chips and small sizes are the irreversible development trend of the existing camera modules. As the photo-sensing chip is developed toward high pixels and large chips, the size of the optical lens fitted with the photo-sensing chip is gradually increased, which brings new challenges to a driving element for driving the optical lens for optical performance adjustment (e.g., optical focusing, optical anti-shake, etc.).

Specifically, the conventional driving element for driving the optical lens is an electromagnetic Motor, such as a Voice Coil Motor (VCM), a Shape Memory Alloy Actuator (SMA), and the like. However, as the optical lens increases in size and weight, the conventional electromagnetic motor has been unable to provide sufficient driving force to drive the optical lens to move. In quantification, the conventional voice coil motor and shape memory alloy driver are only suitable for driving an optical lens with a weight less than 100mg, that is, if the weight of the optical lens exceeds 100mg, the conventional driver cannot meet the application requirements of the camera module.

In addition, with the change and development of market demands, in recent years, an image pickup module configured in a terminal device is also required to be capable of realizing a zoom photographing function, for example, a demand for realizing a distant view photographing by an optical zoom. In comparison with a conventional camera module (e.g., a moving-focus camera module), the optical zoom camera module not only includes a lens having a larger size and weight, that is, a driver is required to provide a larger driving force, but also the driver for driving the lens to move is required to provide a driving performance with higher precision and longer stroke. The above technical requirements cannot be met by the conventional electromagnetic drive motor. Meanwhile, the conventional electromagnetic actuator has a problem of electromagnetic interference.

Therefore, a new driving scheme for the camera module with an adaptive function is needed, and the new driver can meet the development requirements of light and thin camera modules.

Disclosure of Invention

An advantage of the present application is to provide a variable focus camera module, wherein the variable focus camera module uses a novel piezoelectric actuator as a driving element to provide a driving force large enough, and further, to provide a driving performance with higher precision and longer stroke, so as to meet the requirement of adjusting the optical performance of the variable focus camera module, for example, the requirement of optical zooming.

Yet another advantage of the present application is to provide a variable focus camera module, wherein the piezoelectric actuators are arranged in the variable focus camera module by a reasonable arrangement scheme, so as to meet the structural and size requirements of the variable focus camera module.

Other advantages and features of the present application will become apparent from the following description and may be realized by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In order to realize at least one of the above advantages, the present application provides a variable focus camera module, which includes:

a zoom lens group comprising: the zoom lens comprises a fixed part, a zooming part and a focusing part, wherein the zooming lens group is provided with an optical axis;

a photosensitive member held on a light passage of the zoom lens group; and

a drive assembly, comprising: the zoom lens comprises a drive shell, a first drive element, a second drive element, a first carrier, a second carrier, a first prepressing part and a second prepressing part, wherein the first drive element, the second drive element, the first carrier and the second carrier are positioned in the drive shell, the zoom part is installed on the first carrier, and the focusing part is installed on the second carrier;

the first driving element and the second driving element are implemented as piezoelectric actuators, and the first driving element is frictionally coupled to the first carrier through the first pre-pressing part and is configured to move in a two-dimensional trajectory along the direction set by the optical axis in a manner of bending vibration along two directions after being driven so as to drive the first carrier through friction to drive the zooming part to move along the direction set by the optical axis; the second driving element is frictionally coupled to the second carrier through the second pre-pressing portion and configured to move in a two-dimensional trajectory along the direction set by the optical axis in a manner of bending vibration along two directions after being driven, so as to drive the second carrier through friction to drive the focusing portion to move along the direction set by the optical axis.

In a variable focus camera module according to the present application, the piezoelectric actuator includes: the device comprises an actuating system and a driving circuit system, wherein the actuating system moves in a two-dimensional track along a preset direction in a mode of bending vibration along two directions under the control of the driving circuit system.

In the variable focus camera module according to the present application, the actuating system includes: a piezoelectric plate structure and a friction drive fixed to the piezoelectric plate structure, the friction drive being frictionally coupled to the first carrier or the second carrier.

In a variable focus camera module according to the present application, the piezoelectric plate structure has a first side surface extending along a depth direction thereof and a second side surface extending along a height direction thereof and adjacent to the first side surface, wherein the piezoelectric plate structure has a first resonance frequency along the depth direction thereof and a second resonance frequency along the height direction thereof, wherein the second resonance frequency is greater than the first resonance frequency.

In the zoom camera module according to the present application, the piezoelectric plate structure includes a first piezoelectric region, a second piezoelectric region, and a third piezoelectric region formed on the second side surface, and a fourth piezoelectric region formed on the first side surface, where the second piezoelectric region is located between the first piezoelectric region and the third piezoelectric region, and the fourth piezoelectric region is adjacent to the second piezoelectric region; wherein the piezoelectric plate structure further comprises a first electrode pair electrically connected to the first piezoelectric region, a second electrode pair electrically connected to the second piezoelectric region, a third electrode pair electrically connected to the third piezoelectric region, and a fourth electrode pair electrically connected to the fourth electrical connection region.

In the zoom camera module according to the present application, the driving circuit system includes a first driving circuit and a second driving circuit, the first driving circuit is electrically connected to the first electrode pair and the third electrode pair, and the second driving circuit is electrically connected to the second electrode pair and the fourth electrode pair; wherein the circuit vibration signal vibration frequency output by the first driving circuit and the second driving circuit is equal to the first resonance frequency or the second resonance frequency.

In the zoom camera module according to the present application, when the vibration frequency of the circuit vibration signal output by the first driving circuit is the first resonance frequency, the piezoelectric plate structure resonates in the height direction and partially resonates in the depth direction, so that the piezoelectric plate structure moves along a two-dimensional trajectory in a preset direction in a manner of bending vibration in two directions; when the vibration frequency of the circuit vibration signal input by the second driving circuit is the second resonance frequency, the piezoelectric plate structure resonates in the depth direction and partially resonates in the height direction, so that the piezoelectric plate structure moves along a two-dimensional track along a preset direction in a manner of bending vibration along two directions.

In the variable focus camera module according to the present application, the driving assembly further includes a first friction actuating portion and a second friction actuating portion, the first friction actuating portion being sandwiched between the friction driving portion of the first driving element and the first carrier so that the first driving element is frictionally coupled to the first carrier by the first friction actuating portion and the first pre-pressing member; the second friction actuating portion is sandwiched between the friction driving portion of the second driving element and the second carrier to be frictionally coupled to the second carrier by the second pre-pressing part and the second friction actuating portion.

In the zoom camera module according to the present application, the first pre-pressing part includes a first elastic element, and the first elastic element is disposed between the piezoelectric plate structure of the first driving element and the driving housing, so as to force the friction driving part of the first driving element to abut against the first friction actuating part by the elastic force of the first elastic element, and in this way, the first driving element is frictionally coupled to the first carrier; the second pre-pressing element comprises a second elastic element, which is arranged between the piezoelectric plate structure of the second driving element and the driving shell, so as to force the friction driving part of the second driving element to abut against the second friction actuating part through the elastic force of the second elastic element, and in this way, the second driving element is frictionally coupled to the second carrier.

In the variable focus camera module according to the present application, the first elastic member and the second elastic member are implemented as adhesives having elasticity.

In the variable-focus camera module according to the application, the thickness of the first elastic element and the second elastic element is between 10um and 50 um.

In the variable focus camera module according to the present application, the first carrier includes a first groove concavely formed on a surface thereof, and the first friction actuating portion is disposed in the first groove, wherein the first groove forms a guide groove for guiding the friction driving portion of the first driving element to move.

In the variable focus camera module according to the present application, the second carrier includes a second groove concavely formed on a surface thereof, and the second friction actuating portion is disposed in the second groove, wherein the second groove forms a guide groove for guiding the friction driving portion of the second driving element to move.

In a variable focus camera module according to the present application, the first recess has a reduced aperture and/or the second recess has a reduced aperture.

In the zoom camera module according to the present application, the first pre-pressing part includes a first magnetic attraction element disposed on the first carrier and a second magnetic attraction element disposed on the driving housing and corresponding to the first magnetic attraction element, so that a magnetic force between the first magnetic attraction element and the second magnetic attraction element forces a friction driving portion of the first driving element to abut against the first friction actuating portion, and the first driving element is frictionally coupled to the first carrier; the second pre-pressing part comprises a third magnetic attraction element arranged on the second carrier and a fourth magnetic attraction element arranged on the driving shell and corresponding to the third magnetic attraction element, so that the friction driving part of the second driving element is forced to abut against the second friction actuating part through the magnetic acting force between the third magnetic attraction element and the third magnetic attraction element, and the second driving element is frictionally coupled to the second carrier in such a way.

In a variable focus camera module according to the present application, the first drive element and the second drive element are simultaneously arranged at a first side of the variable focus lens group.

In a variable focus camera module according to the present application, the first drive element and the second drive element are arranged in mutual alignment at a first side of the variable focus lens group.

In the variable focus camera module according to the present application, the first drive element is provided between a side surface of the first carrier and a side surface of the drive housing, and the second drive element is provided between a side surface of the second carrier and a side surface of the drive housing.

In the variable focus camera module according to the present application, the first drive element is disposed between a bottom surface of the first carrier and a bottom surface of the drive housing, and the second drive element is disposed between a bottom surface of the second carrier and a bottom surface of the drive housing.

In the variable focus camera module according to the present application, the driving assembly further comprises a guiding structure disposed at a second side of the zoom lens group opposite to the first side, the guiding structure being configured to guide the focusing portion and the zooming portion to move along the optical axis.

In the zoom camera module according to the application, the guide structure includes: the optical axis of the optical axis-parallel driving device comprises a first supporting part and a second supporting part which are formed on the driving shell at intervals, and at least one guide rod which is erected between the first supporting part and the second supporting part and penetrates through the first carrier and the second carrier, wherein the guide rod is parallel to the optical axis, so that the first carrier and the second carrier can be guided to move along the guide rod parallel to the optical axis.

In the variable focus camera module according to the present application, the guide structure further comprises a first guide mechanism disposed between the first carrier and the drive housing and a second guide mechanism disposed between the second carrier and the drive housing, wherein the first guide mechanism is configured to guide the zoom portion to move along the optical axis, and the second guide mechanism is configured to guide the focus portion to move along the optical axis.

In the zoom camera module according to the present application, the first guide mechanism includes at least one ball disposed between the first carrier and the driving housing, and a receiving groove disposed between the first carrier and the driving housing for receiving the at least one ball; the second guide mechanism comprises at least one ball arranged between the second carrier and the driving shell, and an accommodating groove arranged between the second carrier and the driving shell and used for accommodating the at least one ball.

In the zoom camera module according to the application, the first guide mechanism includes: the sliding rail is arranged between the driving shell and the first carrier and is suitable for the sliding of the sliding block; the second guide mechanism includes: the sliding rail is arranged between the driving shell and the second carrier and is suitable for the sliding of the sliding block.

In the module of making a video recording of can zooming according to the application, the module of making a video recording of can zooming further includes: and the light turning element is used for turning the imaging light to the zoom lens group.

In the variable-focus camera module according to the application, the focusing part and the zooming part are adjacently arranged.

Further objects and advantages of the present application will become apparent from a reading of the ensuing description and drawings.

These and other objects, features and advantages of the present application will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.

Fig. 1 illustrates a schematic diagram of a variable focus camera module according to an embodiment of the present application.

Fig. 2 illustrates a schematic diagram of an optical system of the variable focus camera module according to an embodiment of the present application.

Fig. 3 illustrates a schematic cross-sectional view of the variable focus camera module according to an embodiment of the present application.

Fig. 4A illustrates a schematic diagram of a piezoelectric actuator according to an embodiment of the application.

Fig. 4B illustrates a schematic view of a piezoelectric plate structure of the piezoelectric actuator according to an embodiment of the present application.

Fig. 4C illustrates a schematic diagram of a signal output of the driving circuitry of the piezoelectric actuator according to an embodiment of the present application.

Fig. 4D-4F illustrate schematic views of the piezoelectric actuator moving in a first mode according to an embodiment of the present application.

Fig. 4G-4I illustrate schematic views of the piezoelectric actuator moving in a second mode according to embodiments of the present application.

Fig. 4J illustrates another schematic view of a piezoelectric plate structure of the piezoelectric actuator according to an embodiment of the present application.

Fig. 4K illustrates a schematic view of the piezoelectric actuator acting on a moved object according to an embodiment of the present application.

Fig. 4L illustrates a movement diagram of the piezoelectric actuator according to an embodiment of the present application.

Fig. 5 is a schematic diagram illustrating a variant implementation of the variable focus camera module according to an embodiment of the present application.

Fig. 6 illustrates a schematic diagram of another variant embodiment of the variable focus camera module according to an embodiment of the present application.

Fig. 7 is a schematic diagram illustrating yet another variant implementation of the variable focus camera module according to an embodiment of the present application.

Fig. 8 illustrates a schematic diagram of yet another variant implementation according to an embodiment of the present application.

Fig. 9 illustrates a schematic diagram of yet another variant implementation according to an embodiment of the present application.

Detailed Description

Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and that the present application is not limited by the example embodiments described herein.

Summary of the application

As described above, the driving elements for driving the components of the camera module, such as the optical lens and the zoom component, are electromagnetic motors, such as Voice Coil Motors (VCM), shape Memory Alloy actuators (SMA), and the like. Since the camera module is conventionally disposed along the thickness direction of an electronic device such as a mobile phone, the components in the camera module tend to be thin and small, and in this case, the electromagnetic motor can provide a sufficient driving force. However, the structure and the positional relationship of the camera module relative to the electronic device are changed along with the periscopic camera module and other novel camera modules, that is, the camera module can be arranged along the length or the width direction of the electronic device, so that the camera module is not limited by the thickness direction of the electronic device, and the camera module can obtain a larger degree of freedom in the aspect of size increase.

Further, as the demand for the imaging performance of the camera module increases, higher demands are made on each component of the camera module, particularly the zoom component, and with the reduction of the limitation in terms of the increase in size, the component design of the camera module also brings about an increase in the size of the component in order to realize a stronger function, resulting in a further increase in the weight of the component. In this situation, the conventional electromagnetic motor can no longer provide enough driving force, and to the extent that the existing voice coil motor driver can only drive the optical lens with a weight less than 100mg, the memory alloy motor needs a larger stroke space, that is, if the weight of the component to be driven in the camera module exceeds 100mg, the existing driver cannot meet the application requirement of the camera module or needs to increase the size of the driver by a large amount to provide a larger thrust force, so a new generation of driving scheme for the camera module must be developed.

Based on this, the technical route of the present application is to provide a design of a variable focus camera module based on a piezoelectric actuator capable of providing a larger driving force, so as to satisfy a demand for the driving force of a component after the component in a novel variable focus camera module is enlarged.

Here, as can be understood by those skilled in the art, since the technical requirements of the novel variable-focus camera module are completely opposite to those of the conventional variable-focus camera module which needs to be miniaturized, in the technical route for the novel variable-focus camera module, a whole set of design solutions based on the technical requirements of the novel variable-focus camera module is required, rather than simply applying the novel piezoelectric actuator to the design of the conventional variable-focus camera module.

Specifically, the technical scheme of this application provides a module of making a video recording of zooming, includes: a zoom lens group comprising: the zoom lens comprises a fixed part, a zooming part and a focusing part, wherein the zooming lens group is provided with an optical axis; a photosensitive assembly corresponding to the zoom lens group; and, a drive assembly comprising: a driving housing, at least one driving element located in the driving housing, wherein the at least one driving element is disposed at a first side of the zoom lens group, configured to drive the zoom portion and/or the focus portion to move along the optical axis, and the at least one driving element is a piezoelectric actuator.

In this way, by configuring the overall structure of the variable focus camera module based on the piezoelectric actuator capable of providing a greater driving force, and using the piezoelectric actuator as a driving element of the zoom portion and/or the focus portion that needs to be moved, it is possible to drive the optical components of the variable focus camera module having a greater weight, that is, optical components having a weight much greater than 100mg, for example, up to a weight of more than 1 gram. Moreover, even if the stroke provided by the single deformation of the piezoelectric actuator is limited, the long-distance movement of the optical component to be moved can be realized by a mode of superposing the strokes provided by multiple deformations, and the time of the single deformation and the recovery of the piezoelectric actuator is very short, so that the requirement on the zooming time can be completely met in millisecond magnitude.

It should be noted that the variable focus camera module according to the embodiment of the present application is implemented as a variable focus periscopic camera module. Of course, it should be understood by those skilled in the art that, although the variable-focus camera module is implemented as a variable-focus periscopic camera module in the embodiment of the present application, in other examples of the present application, the variable-focus camera module may also be implemented as other types of camera modules, and is not limited by the present application.

Exemplary variable focus camera module

Fig. 1 illustrates a schematic diagram of a variable focus camera module according to an embodiment of the present application. As shown in fig. 1, the variable focus camera module according to the embodiment of the present application is implemented as a periscopic camera module, which includes: a light turning element 10, a zoom lens group 20, a photosensitive assembly 30 and a driving assembly 40.

Accordingly, as shown in fig. 1 and 2, in the embodiment of the present application, the light turning element 10 is configured to receive an imaging light ray from a subject and turn the imaging light ray to the zoom lens group 20. In particular, in the embodiment of the present application, the light turning element 10 is configured to turn the imaging light from the object by 90 °, so that the overall height dimension of the variable focus camera module can be reduced. Here, in consideration of manufacturing tolerance, in an actual operation, an error of within 1 ° may exist in the angle at which the light bending element 10 bends the imaging light, as will be understood by those skilled in the art.

In a specific example of the present application, the light-turning element 10 may be implemented as a mirror (e.g., a plane mirror), or a light-turning prism (e.g., a triangular prism). For example, when the light turning element 10 is implemented as a light turning prism, the light incident surface and the light exiting surface of the light turning prism are perpendicular to each other, and the light reflecting surface of the light turning prism is inclined at an angle of 45 ° to the light incident surface and the light exiting surface, so that when an imaging light enters the light turning prism perpendicularly to the light incident surface, the imaging light can be turned by 90 ° at the light reflecting surface and outputted from the light exiting surface perpendicularly to the light exiting surface.

Of course, in other examples of the present application, the light turning element 10 may also be implemented as other types of optical elements, and is not limited to the present application. In the embodiment of the present application, the variable focus camera module may further include a greater number of light turning elements 10, one reason for which is that: one function of introducing the light turning element 10 is: and (3) turning the imaging light to fold the optical system of the variable-focus camera module with longer Total Track Length (TTL) in structural dimension. Accordingly, when the total optical length (TTL) of the variable focus camera module is too long, a greater number of light turning elements 10 may be disposed to meet the size requirement of the variable focus camera module, for example, the light turning elements 10 may be disposed at the image side of the variable focus camera module or between any two lenses in the zoom lens group 20.

As shown in fig. 1 and fig. 2, in the embodiment of the present application, the zoom lens group 20 corresponds to the light turning element 10, and is configured to receive the imaging light from the light turning element 10 to converge the imaging light. Accordingly, as shown in fig. 2, the variable focus lens package 20 includes, along its set optical axis direction: the zoom lens module comprises a fixed part 21, a zoom part 22 and a focusing part 23, wherein the positions of the zoom part 22 and the focusing part 23 relative to the fixed part 21 can be respectively adjusted under the action of the driving assembly 40, so that the adjustment of the optical performance of the variable-focus camera module, including but not limited to optical focusing and optical zooming functions, is realized. Specifically, the zoom portion 22 and the focus portion 23 can be adjusted by the driving assembly 40, so that the focal length of the zoom lens group 20 of the variable focus camera module is adjusted, thereby clearly shooting objects at different distances.

Specifically, in the present embodiment, the fixing portion 21 includes a first barrel and at least one optical lens housed in the first barrel. In the embodiment of the present application, the fixed portion 21 is adapted to be fixed to a non-moving portion in the driving assembly 40, so that the position of the fixed portion 21 in the variable focus lens group 20 is kept constant.

It should be noted that in other examples of the present application, the fixing portion 21 may not be provided with the first lens barrel, and may only include at least one optical lens, for example, only include a plurality of optical lenses that are embedded with each other. That is, in other examples of the application, the fixing portion 21 may be implemented as a "bare lens".

Specifically, in the embodiment of the present application, the zoom portion 22 includes a second barrel and at least one optical lens accommodated in the second barrel, wherein the zoom portion 22 is adapted to be driven by the driving assembly 40 to move along the optical axis direction set by the zoom lens group 20, so as to implement an optical zoom function of the variable focus camera module, so that the variable focus camera module can implement clear shooting of objects at different distances.

It should be noted that in other examples of the present application, the zoom portion 22 may not be provided with the second barrel, and may only include at least one optical lens, for example, only include a plurality of optical lenses that are embedded with each other. That is, in other examples of the application, the zoom portion 22 may also be implemented as a "bare lens".

Specifically, in the embodiment of the present application, the focusing portion 23 includes a third barrel and at least one optical lens accommodated in the third barrel, wherein the focusing portion 23 is adapted to be driven by the driving assembly 40 to move along the optical axis direction set by the zoom lens group 20, so as to achieve the focusing function of the variable focus camera module. More specifically, the optical focusing achieved by driving the focusing portion 23 can compensate for the focus shift caused by moving the zooming portion 22, thereby compensating for the imaging performance of the variable focus camera module so that the imaging quality thereof meets the preset requirements.

It should be noted that, in other examples of the present application, the focusing portion 23 may not be provided with the third barrel, and only includes at least one optical lens, for example, only includes a plurality of optical lenses that are embedded with each other. That is, in other examples of the application, the focusing portion 23 may also be implemented as a "bare lens".

More specifically, as shown in fig. 1 and fig. 2, in the embodiment of the present application, the fixed portion 21, the zooming portion 22 and the focusing portion 23 of the zoom lens group 20 are sequentially disposed (i.e., in the zoom lens group 20, the zooming portion 22 is located between the fixed portion 21 and the focusing portion 23), that is, when the imaging light from the light turning element 10 passes through the zoom lens group 20, it sequentially passes through the fixed portion 21, then passes through the zooming portion 22, and then passes through the focusing portion 23.

Of course, in other examples of the present application, the relative positional relationship among the fixed portion 21, the zoom portion 22, and the focus portion 23 may also be adjusted, for example, the fixed portion 21 is disposed between the zoom portion 22 and the focus portion 23, and the focus portion 23 is disposed between the zoom portion 22 and the fixed portion 21. It should be understood that in the embodiment of the present application, the relative positional relationship among the fixing portion 21, the zooming portion 22 and the focusing portion 23 can be adjusted according to the optical design requirement and the structural design requirement of the variable focus camera module.

In particular, however, in the embodiment of the present application, in consideration of the structural design of the variable focus camera module, it is preferable that the focusing portion 23 and the zooming portion 22 are disposed adjacently. That is, the positions of the respective portions in the variable focus lens group 20 according to the embodiment of the present application are preferably configured to: the zooming part 22 is located between the fixed part 21 and the focusing part 23, or the focusing part 23 is located between the fixed part 21 and the zooming part 22. It should be understood that the zooming portion 22 and the focusing portion 23 are portions of the zoom lens group 20 that need to be moved, and therefore, the focusing portion 23 and the zooming portion 22 are disposed adjacently, and such a position setting is advantageous for arranging the driving assembly 40, which will be developed in the detailed description of the driving assembly 40.

It should be noted that, in the example illustrated in fig. 2, although the variable focus lens group 20 including one of the fixed portions 21, one of the variable focus portions 22 and one of the focus portions 23 is taken as an example, it should be understood by those skilled in the art that, in other examples of the present application, the specific number of the fixed portions 21, the variable focus portions 22 and the focus portions 23 is selected and is not limited by the present application, and can be adjusted according to the optical design requirement of the variable focus camera module.

In order to limit the imaging light entering the photosensitive component 30, in some examples of the present application, the variable focus camera module further includes a light blocking element (not shown) disposed on the photosensitive path of the photosensitive component 30, wherein the light blocking element can at least partially block the projection of the imaging light, so as to reduce the influence of stray light on the imaging quality of the variable focus camera module as much as possible.

As shown in fig. 2, in the embodiment of the present application, the photosensitive assembly 30 corresponds to the zoom lens group 20, and is configured to receive an image light from the zoom lens group 20 and perform an image, where the photosensitive assembly 30 includes a circuit board 31, a photosensitive chip 32 electrically connected to the circuit board 31, and a filter element 33 held on a photosensitive path of the photosensitive chip 32. More specifically, in the example illustrated in fig. 2, the photosensitive assembly 30 further includes a bracket 34 provided to the circuit board 31, wherein the filter element 33 is mounted on the bracket 34 to be held on a photosensitive path of the photosensitive chip 32.

It should be noted that, in other examples of the present application, the specific implementation manner of the filter element 33 being held on the photosensitive path of the photosensitive chip 32 is not limited in the present application, for example, the filter element 33 may be implemented as a filter film and coated on a surface of one of the optical lenses of the zoom lens group 20 to achieve a filtering effect, and for example, the photosensitive assembly 30 may further include a filter element holder (not shown) mounted on the holder, wherein the filter element 33 is held on the photosensitive path of the photosensitive chip 32 in a manner of being mounted on the filter element holder.

As described above, in order to meet the increasingly wide market demand, high pixel, large chip, and small size are irreversible trends in the development of the existing camera module. As the photosensitive chip 32 progresses toward high pixels and large chips, the size of the zoom lens group 20 fitted to the photosensitive chip 32 also gradually increases, which puts new technical requirements on driving elements for driving the focusing part 23 and the zooming part 22 of the zoom lens group 20.

The new technical requirements are mainly focused on two aspects: a relatively larger driving force, and a more excellent driving performance (specifically, including a more accurate driving control and a longer driving stroke). Further, in addition to the need to find a driver that meets new technical requirements, it is also necessary to consider that the selected driver can be adapted to the current trend of making the camera module lighter and thinner.

Through research and experiments, the inventor of the application provides a piezoelectric actuator with a novel structure, and the piezoelectric actuator can meet the technical requirements of the variable-focus camera module on a driver. And further arranging the piezoelectric actuator in the variable-focus camera module in a proper arrangement mode so as to meet the structural design requirement and the size design requirement of the variable-focus camera module.

Specifically, as shown in fig. 1 and 3, in the embodiment of the present application, the driving assembly 40 for driving the variable focus lens group 20 includes: a drive housing 41, a first drive element 42, a second drive element 43, a first carrier 44 and a second carrier 45, wherein the first drive element 42, the second drive element 43, the first carrier 44 and the second carrier 45 are accommodated in the drive housing 41, such that the variable focus camera module has a relatively more compact structural arrangement.

Specifically, in this embodiment, the first driving element 42 and the second driving element 43 are implemented as a piezoelectric actuator 100, the zooming portion 22 is mounted on the first carrier 44, and the focusing portion 23 is mounted on the second carrier 45, wherein the first driving element 42 is frictionally coupled to the first carrier 44 and configured to move in a two-dimensional trajectory along the direction set by the optical axis in a manner of bending vibration along two directions after being driven, so as to drive the first carrier 44 by friction to move the zooming portion 22 along the direction set by the optical axis, and the second driving element 43 is frictionally coupled to the second carrier 45 and configured to move in a two-dimensional trajectory along the direction set by the optical axis in a manner of bending vibration along two directions after being driven, so as to drive the second carrier 45 by friction to move the focusing portion 23 along the direction set by the optical axis. That is, in the embodiment of the present application, the piezoelectric actuator 100 is used as a driver for driving the zoom portion 22 and the focus portion 23 in the zoom lens group.

Fig. 4A to 4L illustrate schematic views of a piezoelectric actuator according to an embodiment of the application. As shown in fig. 4A, the piezoelectric actuator 100 according to the embodiment of the present application includes: the system comprises an actuating system 110 and a driving circuit system 120, wherein the actuating system 110 moves in a two-dimensional track along a preset direction in a mode of bending vibration along two directions under the control of the driving circuit system 120. In particular, in this embodiment, the piezoelectric actuator 100 is an efficient semi-resonant driving system, and after being turned on, the actuating system 110 of the piezoelectric actuator 100 moves in a two-dimensional trajectory along a preset direction in a manner of bending vibration along two directions to frictionally couple and move the acted-on object along the preset direction.

As shown in fig. 4A, in this embodiment, the actuation system 110 includes a piezoelectric plate structure 111 and a friction drive portion 112 fixed to the piezoelectric plate structure 111. Here, the piezoelectric plate structure 111 may be symmetrical or asymmetrical. The piezoelectric plate structure 111 has a first side surface extending along a depth direction thereof and a second side surface extending along a height direction thereof and adjacent to the first side surface, wherein the piezoelectric plate structure 111 has a first resonance frequency along the depth direction thereof (e.g., D as illustrated in fig. 4A) and a second resonance frequency along the height direction thereof (e.g., H as illustrated in fig. 4A). Typically, the height dimension of the piezoelectric plate structure 111 is larger than its depth dimension, i.e. the second resonance frequency is larger than the first resonance frequency.

In this embodiment, the piezoelectric plate structure 111 includes at least one piezoelectric layer formed together, as shown in fig. 4B. The thickness dimension of the piezoelectric plate structure 111 ranges from 5um to 40um. In particular, in the embodiment of the present application, the at least one piezoelectric layer structure may be a single piezoelectric layer, or may include a plurality of piezoelectric layers stacked together (e.g., a plurality of parallel piezoelectric layers co-fired together). Here, a plurality of piezoelectric layers can achieve similar effects with a smaller applied voltage than a single piezoelectric layer.

As shown in fig. 4A, in this embodiment, the piezoelectric plate structure 111 includes a first piezoelectric region 1111, a second piezoelectric region 1112, and a third piezoelectric region 1113 formed on the second side surface, and a fourth piezoelectric region 1114 formed on the first side surface, wherein the second piezoelectric region 1112 is located between the first piezoelectric region 1111 and the third piezoelectric region 1113, and the fourth piezoelectric region 1114 is adjacent to the second piezoelectric region 1112. Also, the piezoelectric plate structure 111 further includes a first electrode pair 1115 electrically connected to the first piezoelectric region 1111, a second electrode pair 1116 electrically connected to the second piezoelectric region 1112, a third electrode pair 1117 electrically connected to the third piezoelectric region 1113, and a fourth electrode pair 1118 electrically connected to the fourth piezoelectric region 1114. That is, in the example as illustrated in fig. 1, the piezoelectric plate structure 111 includes 4 piezoelectric regions and four electrode pairs electrically connected to the 4 piezoelectric regions, respectively. Of course, in other examples of the present application, the piezoelectric plate structure 111 may include other numbers of piezoelectric regions and electrode pairs, and the present application is not limited thereto.

Also, in some other examples of the present application, one of the first piezoelectric region 1111 and the third piezoelectric region 1113, and/or one of the second piezoelectric region 1112 and the fourth piezoelectric region 1114 may be passive, which may reduce drive amplitude without changing the operation of the actuation system 110.

Further, in the present embodiment, the first piezoelectric region 1111, the second piezoelectric region 1112, the third piezoelectric region 1113, and the fourth piezoelectric region 1114 have polarities generated by polarization during a manufacturing process, thereby forming a positive electrode and a negative electrode. Specifically, the first piezoelectric region 1111 is polarized during manufacturing such that one electrode of the first electrode pair 1115 corresponding to the first piezoelectric region 1111 forms a negative electrode (e.g., a —, as illustrated in fig. 4A), and the other electrode forms a positive electrode (e.g., a ±) (as illustrated in fig. 4A); the third piezoelectric region 1113 is polarized in the manufacturing process so that one electrode of the third electrode pair 1117 corresponding to the third piezoelectric region 1113 forms a negative electrode (e.g., B-as illustrated in fig. 4A) and the other electrode forms a positive electrode (e.g., B + as illustrated in fig. 4A); the second piezoelectric region 1112 is polarized during fabrication such that one electrode of a second electrode pair 1116 corresponding to the second piezoelectric region 1112 forms a negative electrode (e.g., C-, as illustrated in FIG. 4A) and the other electrode forms a positive electrode (e.g., C +), as illustrated in FIG. 4A; the fourth piezoelectric region 1114 is polarized in the manufacturing process such that one electrode of the fourth electrode pair 1118 corresponding to the fourth piezoelectric region 1114 forms a negative electrode (e.g., D-, as illustrated in fig. 4A) and the other electrode forms a positive electrode (e.g., D +, as illustrated in fig. 4A). It should be noted that in this embodiment, each electrode of the first electrode pair 1115 and/or the second electrode pair 1116 and/or the third electrode pair 1117 and/or the second electrode pair 1116 has an "L" shape.

As shown in fig. 4A and 4B, in this embodiment, one electrode of the first electrode pair 1115 is coupled to and connected to one internal electrode of each piezoelectric layer of the first piezoelectric region 1111 in an interleaved manner, and the other electrode of the first electrode pair 1115 is connected to an internal electrode of the first piezoelectric region 1111 opposite to each piezoelectric layer in an interleaved manner, wherein one electrode of the first electrode pair 1115 is determined to be positive and the other electrode is determined to be negative during polarization. One electrode of the second electrode pair 1116 is coupled to and cross-connected with one internal electrode of each piezoelectric layer of the second piezoelectric region 1112, and the other electrode of the second electrode pair 1116 is cross-connected with an internal electrode of the second piezoelectric region 1112 opposite to each piezoelectric layer, wherein one electrode of the second electrode pair 1116 is determined as a positive electrode and the other electrode is determined as a negative electrode during polarization. One electrode of the third electrode pair 1117 is coupled to and cross-connected with one internal electrode of each piezoelectric layer of the third piezoelectric region 1113, and the other electrode of the third electrode pair 1117 is cross-connected with an internal electrode of the third piezoelectric region 1113 opposite to each piezoelectric layer, wherein one electrode of the third electrode pair 1117 is determined to be positive and the other electrode is determined to be negative during polarization. One electrode of the third electrode pair 1117 is coupled to and cross-connected with one internal electrode of each piezoelectric layer of the third piezoelectric region 1113, and the other electrode of the third electrode pair 1117 is cross-connected with an internal electrode of the third piezoelectric region 1113 opposite to each piezoelectric layer, wherein one electrode of the third electrode pair 1117 is determined to be positive and the other electrode is determined to be negative during polarization.

With further reference to fig. 4A, in this embodiment, the driving circuit system 120 includes a first driving circuit 121 and a second driving circuit 122, the first driving circuit 121 is electrically connected to the first electrode pair 1115 and the third electrode pair 1117, and the second driving circuit 122 is electrically connected to the second electrode pair 1116 and the fourth electrode pair 1118, wherein the first driving circuit 121 and the second driving circuit 122 may be a full-bridge driving circuit or other driving circuits. In particular, in this embodiment, the drive circuitry 120 has 4 output circuit vibration signals: 124 (1) -124 (4), wherein the output circuit vibration signal may be an ultrasonic square wave vibration signal as shown in fig. 4C, or may be other signals, such as a sinusoidal signal.

In operation of the piezoelectric actuator 100, the piezoelectric plate structure 111 has two bending modes: mode 1 and mode 2, where mode 1 and mode 2 each have a different resonant frequency. The amplitude of the vibration of the bending mode of the piezoelectric plate structure 111 depends on the vibration frequency of the output circuit vibration signal. Specifically, when the drive circuitry 120 applies a circuit vibration signal to the piezoelectric plate structure 111 at a resonant frequency for one of the two bending modes (e.g., the resonant frequency of mode 1), the vibration amplitude for the bending mode operating at its resonant frequency is fully amplified and only partially amplified for the other bending modes operating at partial resonance. More specifically, when the vibration frequency of the circuit vibration signal output by the first driving circuit 121 is the first resonance frequency, the piezoelectric plate structure 111 resonates in the height direction thereof and partially resonates in the depth direction thereof, so that the piezoelectric plate structure 111 moves in a two-dimensional trajectory along a preset direction in a manner of bending vibration in two directions; when the vibration frequency of the circuit vibration signal input by the second driving circuit 122 is the second resonance frequency, the piezoelectric plate structure 111 resonates in the depth direction and partially resonates in the height direction, so that the piezoelectric plate structure 111 moves along a two-dimensional trajectory in a preset direction in a manner of bending vibration in two directions.

More specifically, in the example as illustrated in fig. 4A and 4C, 4 kinds of circuit vibration signals can be output from the first drive circuit 121 and the second drive circuit 122: 124 (1) -124 (4). In this embodiment, the voltages of the circuit vibration signals are 2.8v, and the 4 vibration signals each have a vibration frequency substantially equal to the resonance frequency of either of the two bending modes of the piezoelectric plate structure 111, i.e., substantially equal to the first resonance frequency or the second resonance frequency. In addition, the circuit vibration signals from outputs 124 (1) -124 (2) are phase shifted by the drive circuitry 120 by about 0 to 90 degrees relative to the circuit vibration signals from outputs 124 (3) -124 (4) to move in one of two directions. When the drive circuitry 120 adjusts the phase of the outputs 124 (1) -124 (2) to be approximately-180 degrees to-90 degrees relative to the outputs 124 (3) -124 (4) to move the movable member in the opposite direction (i.e., the opposite of the two directions).

Fig. 4D to 4F illustrate schematic views of the piezoelectric actuator 100 according to an embodiment of the present application moving in a first mode. As shown in fig. 4D to 4F, the bending mode is generated due to the application of circuit vibration signals from the outputs 124 (1) -124 (2) of different stages to the first piezoelectric region 1111 and the third piezoelectric region 1113 having opposite polarities. When the piezoelectricity of all electrodes is 0, fig. 4D shows the situation when the piezoelectric plate structure 111 is stationary. When the voltage difference between outputs 124 (1) and 124 (2) is positive, the length of the first piezoelectric region 1111 increases, and the length of the third piezoelectric region 1113 decreases, so that the piezoelectric plate bends as shown in fig. 4E. When the voltage difference between the outputs 124 (1) and 124 (2) is negative, the length of the first piezoelectric region 1111 decreases, and the length of the third piezoelectric region 1113 increases, so that the piezoelectric plate structure bends as shown in fig. 4F.

Fig. 4G to 4I illustrate schematic views of the piezoelectric actuator 100 according to an embodiment of the present application moving in a second mode.

As shown in fig. 4G-4I, the bending mode is generated as a result of vibration signals from the outputs 124 (3) -124 (4) of different phases being applied to the second and fourth

piezoelectric regions

1112, 1114 having opposite polarities. When the piezoelectricity of all electrodes is 0, fig. 4G shows the case when the piezoelectric plate structure 111 is stationary. When the voltage difference between outputs 124 (3) and 124 (4) is positive, the length of the second piezoelectric region 1112 decreases and the length of the fourth piezoelectric region 1114 increases, causing the piezoelectric plate structure 111 to bend as shown in FIG. 4H. When the voltage difference between outputs 124 (3) and 124 (4) is negative, the length of the second piezoelectric region 1112 increases and the length of the fourth piezoelectric region 1114 decreases, causing the piezoelectric plate structure to bend as shown in fig. 4I.

Accordingly, when the output circuit vibration signal as illustrated in fig. 3 is applied to the actuator system 110, the actuator system 110 forms an elliptical orbit-like two-dimensional trajectory, that is, the drive circuit system 120 can control the direction in which the actuator system 110 rotates on the elliptical orbit path according to the phase difference value, so that the actuator system 110 can drive the object to be worked at a relatively smaller and more accurate step speed.

Fig. 4J illustrates another schematic view of the piezoelectric plate structure 111 of the piezoelectric actuator 100 according to an embodiment of the present application. As shown in fig. 4J, in the embodiment of the present application, the actuating system 110 further includes a friction driving portion 112 fixed to the piezoelectric plate structure 111, wherein the friction driving portion 112 is adapted to be frictionally coupled to the acted object to drive the acted object to move along a predetermined direction by friction. In order to enable the friction driving part 112 to be frictionally coupled to the acted object, as shown in fig. 4K, during the mounting process, a pre-pressure device is generally configured for the piezoelectric actuator 100, and the pre-pressure device provides pre-pressure between the piezoelectric actuator 100 and the acted object, so that the friction driving part 112 of the piezoelectric actuator 100 can be frictionally coupled to the acted object to drive the acted object to move along a predetermined direction by friction, as shown in fig. 4L.

In particular, in this embodiment, the friction driving part 112 includes at least one contact pad, which can be fixed to the piezoelectric plate structure 111 along the depth direction and can also be fixed to the piezoelectric plate structure 111 along the height direction. In this embodiment, the at least one contact pad may have a hemispherical shape, but may have other shapes, such as a semi-cylindrical shape, a truncated cone shape, a rectangular shape, etc. Preferably, the at least one contact pad is made of a material having good friction and durability properties, such as a metal oxide material (e.g., zirconia, alumina, etc.).

It is worth mentioning that the piezoelectric actuator 100 has the advantages of small volume, large thrust and high precision compared to the conventional electromagnetic actuator. In view of quantification, the piezoelectric actuator 100 according to the embodiment of the present application can provide a driving force of 0.6N to 2N, which is sufficient to drive a component having a weight of more than 100 mg.

In addition to being able to provide a relatively large driving force, the piezoelectric actuator 100 has other advantages over conventional electromagnetic and memory alloy motor solutions, including but not limited to: the size is relatively small (with slender shape), the response precision is better, the structure is relatively simpler, the driving control is relatively simpler, the product consistency is high, no electromagnetic interference exists, the stroke is relatively large, the stabilization time is short, the weight is relatively small, and the like.

Specifically, the variable focus camera module requires a driver configured therein to have features such as a long driving stroke and a need to ensure good alignment accuracy. In current voice coil motor scheme, need additionally to design guide arm or ball guide in order to guarantee the motion linearity, need simultaneously at the large-size drive magnet of camera lens lateral part adaptation/coil etc. need set up auxiliary positioning device such as ball, shell fragment, suspension wire simultaneously, for holding more parts, guarantee structural strength and reservation structure clearance, often lead to the module horizontal size to be big partially, and structural design is complicated, and module weight is heavier. The memory alloy motor scheme is limited by relatively few strokes that the memory alloy scheme can provide in the same proportion, and meanwhile, the reliability risks of potential wire breakage and the like exist.

The piezoelectric actuator 100 has a relatively simple structure, the assembly structure is simpler, and the size of the element is basically independent of the size of the motion stroke of the piezoelectric actuator 100, so that the piezoelectric actuator 100 can realize the advantages of large thrust, small size, small weight and the like in optical zoom products, and meanwhile, the design is matched with larger stroke or heavier device weight, and the integration level in the design is higher.

Further, the piezoelectric actuator 100 pushes the object to be pushed to perform micron-scale motion in a friction contact manner, and compared with a non-contact manner in an electromagnetic scheme, the method for driving the object to be pushed needs to rely on electromagnetic force to counteract gravity, and a friction manner has the advantages of larger thrust, larger displacement and lower power consumption, and meanwhile, the control precision is higher, and high-precision continuous zooming can be realized. In addition, when a plurality of motor mechanisms are provided, the piezoelectric actuator 100 has no magnet coil structure, and thus has no magnetic interference problem. In addition, the piezoelectric actuator 100 can be self-locked by means of friction force between components, so that shaking noise of the variable-focus camera module during optical zooming can be reduced.

After the piezoelectric actuator 100 is selected as the first driving element 42 and the second driving element 43, the piezoelectric actuator 100 needs to be arranged in a reasonable manner in the variable-focus camera module, and more specifically, in this embodiment, the piezoelectric actuator 100 needs to be arranged in the driving housing 41 in a reasonable manner, so as to meet the optical performance adjustment requirement, the structural design requirement, and the size design requirement of the variable-focus camera module.

More specifically, as shown in fig. 1, in this embodiment, the driving assembly 40 further includes a first pre-pressing part 50 and a second pre-pressing part 60, wherein the first driving element 42 is frictionally coupled to the first carrier 44 through the first pre-pressing part 50 and configured to move in a two-dimensional trajectory along the direction set by the optical axis in a manner of bending vibration along two directions after being driven, so as to drive the first carrier 44 by friction to move the zooming part 22 along the direction set by the optical axis. The second driving element 45 is frictionally coupled to the second carrier 45 through the second pre-pressing portion 60 and configured to move along the direction set by the optical axis in a two-dimensional trajectory in a manner of bending vibration along two directions after being driven, so as to drive the second carrier 45 by friction to drive the focusing portion 23 to move along the direction set by the optical axis.

Here, the first drive element 42 is frictionally coupled to the first carrier 44, including: the first drive element 42 is in direct frictional engagement with the first carrier 44 and in indirect frictional engagement between the first drive element 42 and the first carrier 44 (i.e., although there is no direct frictional force between the first drive element 42 and the first carrier 44, the frictional drive force generated by the first drive element 42 is able to act on the first carrier 44). In correspondence, the second driving element 43 is frictionally coupled between the second carrier 45 and the driving housing 41, comprising: the second drive element 43 is in direct frictional engagement with the second carrier 45 and in indirect frictional engagement between the second drive element 43 and the second carrier 45 (i.e., although there is no direct frictional force between the second drive element 43 and the second carrier 45, the frictional drive force generated by the second drive element 44 is able to act on the second carrier 45).

In order to improve the friction driving performance of the first driving element 42 and the second driving element 44, as shown in fig. 1, in this embodiment, the driving assembly 40 further includes a first friction actuating portion 131, wherein the first friction actuating portion 131 is clampingly disposed between the friction driving portion 112 of the first driving element 42 and the first carrier 44, so that the first driving element 42 is frictionally coupled to the first carrier 44 through the first friction actuating portion 131 and the first pre-pressing part 50. Specifically, as shown in fig. 1, under the action of the first pre-pressing part 50, the friction driving part 112 of the first driving element 42 abuts against the first friction actuating part 131, and under the action of the friction driving part 112, the first friction actuating part 131 abuts against the first carrier 44, in such a way that the first driving element 42 is frictionally coupled to the first carrier 44 to move in a two-dimensional trajectory along the direction set by the optical axis in a manner of bending vibration along two directions after being driven, so as to drive the first carrier 44 by friction to drive the zooming part 22 to move along the direction set by the optical axis.

As shown in fig. 1, in this embodiment, the driving assembly 40 further includes a second friction actuating portion 132, and the second friction actuating portion 132 is sandwiched between the friction driving portion 112 of the second driving element 43 and the second carrier 45, so that the second driving element 43 is frictionally coupled to the second carrier 45 through the second pre-pressing part 60 and the second friction actuating portion 132. Specifically, as shown in fig. 1, under the action of the second pre-pressing part 60, the friction driving part 112 of the second driving element 43 abuts against the second friction actuating part 132, and under the action of the friction driving part 112, the second friction actuating part 132 abuts against the second carrier 45, in such a way that the second driving element 43 is frictionally coupled to the second carrier 45 to move in a two-dimensional trajectory along the direction set by the optical axis in a manner of bending vibration along two directions after being driven, so as to drive the second carrier 45 by friction to drive the zooming part 23 to move along the direction set by the optical axis.

More specifically, as shown in fig. 1, in this embodiment, the first friction actuating portion 131 has a first surface and a second surface opposite to the first surface, wherein under the action of the first pre-pressing part 50, the first surface of the first friction actuating portion 131 abuts against the surface of the first carrier 44, and the second surface thereof abuts against the friction driving portion 112, in such a way that the first driving element 42 is frictionally coupled to the first carrier 44. Correspondingly, the second friction actuating portion 132 has a third surface and a fourth surface opposite to the third surface, wherein the third surface of the second friction actuating portion 132 is abutted against the surface of the second carrier 45 and the fourth surface is abutted against the friction driving portion 112 under the action of the second pre-pressing member 60, in such a way that the second driving element 43 is frictionally coupled to the second carrier 45.

It is worth mentioning that, although in the example illustrated in fig. 1, the first friction actuating portion 131 and the second friction actuating portion 132 are respectively disposed between the first driving element 42 and the first carrier 44 and between the second driving element 43 and the second carrier 45 as a single component, for example, the first friction actuating portion 131 is implemented as a single component and attached to a side surface of the first carrier 42, or the second friction actuating portion 132 is implemented as a single component and attached to a side surface of the second carrier 45, and further, for example, the first friction actuating portion 131 is implemented as a coating layer applied to a side surface of the first carrier 42, or the second friction actuating portion 132 is implemented as a coating layer applied to a side surface of the second carrier 45. It should be understood that, in other examples of the present application, the first friction actuating portion 131 may also be integrally formed on the surface of the outer side wall of the first carrier 42, i.e., the first friction actuating portion 131 and the first carrier 42 have an integral structure. Of course, in other examples of the present application, the second friction actuating portion 132 may also be integrally formed on the surface of the outer sidewall of the second carrier 45, i.e., the second friction actuating portion 132 and the second carrier 45 have an integral structure.

Further, in the example illustrated in fig. 1, the first pre-pressing part 50 includes a first elastic element 51, and the first elastic element 51 is disposed between the piezoelectric plate structure 111 of the first driving element 42 and the driving housing 41, so as to provide a pre-pressing force between the friction driving portion 112 of the first driving element 42 and the first friction actuating portion 131 through an elastic force of the first elastic element 51 and enable the first friction actuating portion 131 to abut against the surface of the first carrier 44 through the first elastic element 51. That is, the first driving element 42 is clamped between the driving housing 41 and the first carrier 44 by the elastic force of the first elastic element 51, that is, the friction driving part 112 of the first driving element 42 is abutted against the first friction actuating part 131 and the first friction actuating part 131 is abutted against the side surface of the first carrier 44, in such a way that the first driving element 42 is frictionally coupled to the first carrier 44.

In a specific example of the present application, the first elastic element 51 is implemented as an adhesive having elasticity, i.e. the first elastic element 51 is implemented as a glue having elasticity after curing. Accordingly, during the mounting process, a layer of adhesive with a thickness of 10um to 50um may be applied between the surface of the inner sidewall of the driving housing 41 and the piezoelectric plate structure 111 of the first driving element 42, so as to form the first elastic element 51 disposed between the piezoelectric plate structure 111 of the first driving element 42 and the driving housing 41 after the adhesive is cured and molded. That is, the first elastic member 51 can also cause the first driving member 42 to be fixed to the surface of the inner side wall of the driving housing 41 while providing the pre-pressure. Preferably, the first elastic element 51 has a relatively high flatness, that is, when the adhesive is applied, the applied adhesive is guaranteed to have a relatively high flatness and uniformity as much as possible, so that the first driving element 42 can be smoothly fixed on the surface of the inner side wall of the driving housing 41, thereby improving the driving stability of the first driving element 42.

In particular, in the example illustrated in fig. 1, the second pre-pressing part 60 includes a second elastic element 61, and the second elastic element 61 is disposed between the piezoelectric plate structure 111 of the second driving element 43 and the driving shell 41, so as to provide pre-pressing force between the friction driving part 112 of the second driving element 43 and the second friction actuating part 132 through the elastic force of the second elastic element 61 and make the second friction actuating part 132 abut against the surface of the second carrier 45 through the second elastic element 61. That is, the second driving element 43 is clampingly disposed between the driving housing 41 and the second carrier 45 by the elastic force of the second elastic element 61, that is, the friction driving part 112 of the second driving element 43 is abutted against the second friction actuating part 132 and the second friction actuating part 132 is abutted against the surface of the second carrier 45, in such a way that the second driving element is frictionally coupled to the second carrier.

In a specific example of the present application, the second elastic element 61 is implemented as an adhesive having elasticity, i.e. the second elastic element 61 is implemented as a glue having elasticity after curing. Accordingly, in the mounting process, a layer of adhesive with a thickness of 10um to 50um may be applied between the surface of the inner sidewall of the driving housing 41 and the piezoelectric plate structure 111 of the second driving element 43, so as to form the second elastic element 61 disposed between the piezoelectric plate structure 111 of the second driving element 43 and the driving housing 41 after the adhesive is cured and molded. That is, the second elastic member 61 can also cause the second driving member 43 to be fixed to the surface of the inner side wall of the driving housing 41 while providing the pre-pressure. Preferably, the second elastic element 61 has a relatively high flatness, that is, when the adhesive is applied, it is ensured that the applied adhesive has a relatively high flatness and uniformity as much as possible, so that the second driving element 43 can be smoothly fixed on the surface of the inner side wall of the driving housing 41, thereby improving the driving stability of the second driving element 43.

It should be noted that, in other embodiments of the present application, the first elastic element 51 and the second elastic element 61 may also be implemented as elastic elements without viscosity, for example, rubber with elasticity in the characteristics of the material itself, or springs, plate springs, etc. with elasticity due to deformation, which is not limited by the present application.

Further, as shown in fig. 1 and 3, in this embodiment, the first driving element 42 and the second driving element 43 are selected to be disposed on the first side of the zoom lens group 20 at the same time, that is, the first driving element 42 and the second driving element 43 are selected to be disposed on the same side of the zoom lens group 20, so that the arrangement compactness of the first driving element 42 and the second driving element 43 in the driving housing 41 is higher, and the occupied longitudinal space of the driving housing 41 is smaller. Here, the longitudinal space of the driving housing 41 refers to a space occupied by the driving housing 41 in a length direction thereof, and accordingly, the lateral space of the driving housing 41 refers to a space occupied by the driving housing 41 in a width direction thereof, and the height space of the driving housing 41 refers to a space occupied by the driving housing 41 in a height direction thereof.

Also, when the first driving element 42 and the second driving element 43 are disposed on the same side of the zoom lens group 20, when the zoom portion 22 is driven by the first driving element 42 and the focus portion 23 is driven by the second driving element 43, a relative positional relationship error (particularly, a relative tilt relationship) between the zoom portion 22 and the focus portion 23 can be reduced to improve the consistency between the focus portion 23 and the zoom portion 22, and reduce the possibility of a decrease in the imaging quality of the variable focus camera module due to the tilt of the zoom portion 22 and the focus portion 23.

Preferably, when the first driving element 42 and the second driving element 43 are located on the same side of the zoom lens group 20, the first driving element 42 and the second driving element 43 are arranged in alignment in the height direction of the first side of the zoom lens group 20, that is, the first driving element 42 and the second driving element 43 have the same installation height, so that the consistency of the focusing portion 23 and the zooming portion 22 in the height direction set by the driving housing 41 is relatively higher, that is, after the zooming portion 22 is driven by the first driving element 42 and the focusing portion 23 is driven by the second driving element 43, the consistency of the zooming portion 22 and the focusing portion 23 in the height direction set by the driving housing 41 is relatively higher, so as to ensure the imaging quality of the variable focus imaging module.

As described above, in the embodiment of the present application, it is preferable that the focusing portion 23 and the zooming portion 22 of the zoom lens group 20 are adjacently disposed. In such a positional relationship, the first driving element 42 and the second driving element 43 may be disposed adjacently, so as to reduce the size of the longitudinal space of the driving housing 41 occupied by the whole of the first driving element 42 and the second driving element 43, which is beneficial to the trend of miniaturization of the variable focus imaging module.

In order to enable the first drive element 42 and the second drive element 43 to drive the first carrier 44 and the second carrier 45 more smoothly and to maintain the relative positional relationship between the first carrier 44 and the second carrier 45 with relatively high precision, as shown in fig. 1 and 2, in the present embodiment, the drive assembly 40 further includes a guide structure 46, and the guide structure 46 is configured to guide the focusing part 23 and the zooming part 22 to move along the optical axis.

In view of the structural design of the variable focus camera module, it is preferable in the embodiment of the present application that the guiding structure 46 is disposed on a second side of the variable focus lens group 20 opposite to the first side. That is, in the embodiment of the present application, it is preferable that the first driving element 42 and the second driving element 43 (as the first portion) and the guide structure 46 (as the second portion) are respectively provided on opposite sides of the variable focus camera module 20, in such a manner that the internal space of the variable focus camera module is sufficiently utilized to facilitate the weight and thickness reduction of the variable focus camera module.

As shown in fig. 1 and 3, in this embodiment, the first driving element 42 and the second driving element 43 share one guiding structure 46, that is, the first carrier 44 and the second carrier 45 share one guiding structure, in such a way as to facilitate stably maintaining the relative positional relationship between the first carrier 44 and the second carrier 45, so as to facilitate stably maintaining the relative positional relationship between the focusing portion 23 and the zooming portion 22 of the zoom lens group 20, so as to improve the resolving power of the zoom lens group 20.

More specifically, as shown in fig. 1 and 3, in this example, the guide structure 46 includes: a first supporting portion 461 and a second supporting portion 462 which are formed at intervals on the driving housing 41, and at least one guide 463 which is erected between the first supporting portion 461 and the second supporting portion 462 and penetrates the first carrier 44 and the second carrier 45, wherein the guide 463 is parallel to the optical axis, so that the first carrier 44 and the second carrier 45 can be guided to move along the guide 463 which is parallel to the optical axis.

Accordingly, in this example, the first support portion 461 and the second support portion 462 function to bridge the guide 463. For example, in a specific embodiment of this example, the first support 461 and the second support 462 may be mounted on the bottom surface of the driving housing 41 (for example, the first support 461 and the second support 462 may be implemented as support brackets), and of course, the first support 461 and the second support 462 may be integrally formed on the bottom surface of the driving housing 41, which is not limited in this application. Of course, in other specific embodiments of this example, the first support 461 and the second support 462 may also be implemented as side walls of the driving housing 41, that is, two opposite side walls of the driving housing 41 form the first support 461 and the second support 462.

Accordingly, in order to allow the guide 463 to pass therethrough, guide grooves 464 may be provided in the first and

second support portions

461 and 462, and guide passages 465 penetrating both side surfaces thereof are formed in the first and

second carriers

44 and 45, so that the guide 463 may be erected on the first and

second support portions

461 and 462 while passing through the guide passages 465 of the first and

second carriers

44 and 45 in such a manner as to be fitted to the guide grooves 464. Further, in this particular example, a lubrication medium may be optionally provided within the guide rod passages 465 of the first and

second carriers

44, 45 to reduce friction.

It should be noted that, in the embodiment of the present application, preferably, the guide rod 463 is flush with the friction driving portion 112 of the first driving element 42 and/or the friction driving portion 112 of the second driving element 43, so that the risk of tilting between the focusing portion and the zooming portion can be reduced to ensure the imaging quality of the zoom camera module.

Fig. 5 illustrates a schematic diagram of a variant implementation of the guide structure of the variable focus camera module according to an embodiment of the present application. As shown in fig. 5, in this example, the driving assembly 40 further includes a first guiding mechanism 47 disposed between the first carrier 44 and the driving housing 41 and a second guiding mechanism 48 disposed between the second carrier 45 and the driving housing 41, wherein the first guiding mechanism 47 is configured to guide the zoom portion 22 to move along the optical axis, and the second guiding mechanism 48 is configured to guide the focusing portion 23 to move along the optical axis.

Specifically, as shown in fig. 5, the first guiding mechanism 47 includes at least one ball 401 disposed between the first carrier 44 and the driving housing 41, and a receiving groove 402 disposed between the first carrier 44 and the driving housing 41 for receiving the at least one ball 401. That is, the first guide mechanism 47 is the ball 401 guide structure 46. The second guiding mechanism 48 includes at least one ball 401 disposed between the second carrier 45 and the driving housing 41, and a receiving groove 402 disposed between the second carrier 45 and the driving housing 41 for receiving the at least one ball 401. That is, in this example, the second guide mechanism 48 is also a ball 401 guide structure 46.

In one embodiment, as shown in fig. 5, the receiving groove 402 may be formed on a side surface of the first carrier 44 and a surface of an inner sidewall of the driving housing 41, so that the at least one ball 401 slides or rolls in the receiving groove 402, and a length direction of the receiving groove 402 is consistent with the optical axis direction. In one embodiment, as shown in fig. 7, the receiving groove 402 may be formed on a side surface of the second carrier 45 and a surface of an inner sidewall of the driving housing 41, so that the at least one ball 401 slides or rolls in the receiving groove 402.

Preferably, the first guide mechanism 47 and the second guide mechanism 48 are configured identically, and the receiving groove 402 of the first guide mechanism 47 and the receiving groove 402 of the second guide mechanism 48 are in the same line and are connected to each other, so that the inclination between the first carrier 44 and the second carrier 45 can be reduced.

Fig. 6 illustrates a schematic diagram of another variant implementation of the guide structure of the variable focus camera module according to an embodiment of the present application. As shown in fig. 6, in this example, the first guide mechanism 47 includes: at least one sliding block 403 disposed between the first carrier 44 and the driving housing 41, and a sliding slot 404 disposed between the driving housing 41 and the first carrier 44 and adapted to slide the at least one sliding block 403. That is, in this example, the first guide mechanism 47 is a slider and slide rail structure. The second guide mechanism 48 includes: at least one sliding block 403 disposed between the second carrier 45 and the driving housing 41, and a sliding slot 404 disposed between the driving housing 41 and the second carrier 45 and adapted to slide the at least one sliding block 403. That is, in this example, the second guide mechanism 48 is also of a slider and runner structure.

In a specific embodiment of this example, the slider 403 is protrudingly formed on a side surface of the first carrier 44, and the slide groove 404 is concavely formed at a corresponding position of a surface of an inner side wall of the drive housing 41. In this embodiment, the slider 403 is protrudingly formed on a side surface of the second carrier 45, and the slide groove 404 is concavely formed on a corresponding position of a surface of an inner side wall of the drive housing 41.

Preferably, the arrangement of the slide 403 and the slide 404 between the first carrier 44 and the drive housing 41 is the same as the arrangement of the slide 403 and the slide 404 between the second carrier 45 and the drive housing 41, in particular the dimensions of the slide 403 and the slide 404. Further, two slide grooves 404 provided on the driving housing 41 corresponding to the first carrier 44 and the second carrier 45 are in the same line and may be connected to each other, so that the inclination of the first carrier 44 and the second carrier 45 may be further reduced.

Fig. 7 is a schematic diagram illustrating another variant implementation of the variable focus camera module according to the embodiment of the present application, in which the arrangement positions of the first drive element 42 and the second drive element 43 are changed in this variant embodiment. Specifically, in this modified embodiment, the first driving element 42 is disposed between the bottom surface of the first carrier 44 and the bottom surface of the driving housing 41, and the second driving element 43 is disposed between the bottom surface of the second carrier 45 and the bottom surface of the driving housing 41. That is, in this modified embodiment, there is an available gap between the bottom surface of the first carrier 44 and the bottom surface of the drive housing 41 to be suitable for arranging the first drive element 42, and there is an available gap between the bottom surface of the second carrier 45 and the bottom surface of the drive housing 41 to be suitable for arranging the second drive element 43.

Also in this modified embodiment, the structural arrangement of the first pre-pressing member 50 and the second pre-pressing portion 60 is also adjusted. Specifically, as shown in fig. 7, in this modified embodiment, the first pre-pressing part 50 includes a first magnetic attraction element 52 disposed on the bottom surface of the first carrier 44 and a second magnetic attraction element 53 disposed on the bottom surface of the driving housing 41 and corresponding to the first magnetic attraction element 52, so as to provide a pre-pressing force between the friction driving portion 112 of the first driving element 42 and the first friction actuating portion 131 by a magnetic force between the first magnetic attraction element 52 and the second magnetic attraction element 53, so that the first driving element 42 is frictionally coupled to the first carrier 44.

In this variant, the first magnetically attracting element 52 and the second magnetically attracting element 53 refer to magnetically attracting components capable of attracting each other, for example, the first magnetically attracting element 52 may be implemented as a magnet, and the second magnetically attracting element 53 may be implemented as a magnetic component, for example, a material made of metal such as iron, nickel, cobalt, etc.; as another example, the first magnetically attractive element 52 can be implemented as a magnet, and the second magnetically attractive element 53 can also be implemented as a magnet.

Accordingly, in this embodiment, the second pre-pressing part 60 includes a third magnetic attraction element 62 disposed on the second carrier 45 and a fourth magnetic attraction element 63 disposed on the driving housing 41 and corresponding to the third magnetic attraction element 62, so as to provide a pre-pressing force between the friction driving portion 112 of the second driving element 43 and the second friction actuating portion 132 by a magnetic force between the third magnetic attraction element 62 and the third magnetic attraction element 62, and force the second friction actuating portion 132 to abut against the bottom surface of the second carrier 45.

In this variant, the third magnetic element 62 and the fourth magnetic element 63 refer to magnetic components capable of attracting each other, for example, the third magnetic element 62 may be implemented as a magnet, and the fourth magnetic element 63 may be implemented as a magnetic component, for example, a material made of metal such as iron, nickel, cobalt, etc.; as another example, the third magnetically attractive element 62 can be implemented as a magnet and the fourth magnetically attractive element 63 can also be implemented as a magnet.

Fig. 8 illustrates a schematic diagram of a variant implementation of the variable focus camera module according to an embodiment of the present application, wherein, in this variant embodiment, the first carrier 44 has a first groove 441 concavely formed in a side surface thereof and extending transversely, the second carrier 45 has a second groove 451 concavely formed in a side surface thereof and extending transversely, wherein the first friction actuating portion 131 is disposed in the first groove 441 such that the first friction actuating portion 131 is disposed more stably between the first driving element 42 and the first carrier 44, and the second friction actuating portion 132 is disposed in the second groove 451 such that the second friction actuating portion 132 is disposed more stably between the second driving element 43 and the second carrier 45.

It should be noted that in this embodiment, the depth of the first groove 441 is approximately equal to the thickness of the first friction actuating portion 131, and the depth of the second groove 451 is approximately equal to the thickness of the second friction actuating portion 132. Of course, in other examples of the present application, the depth of the first groove 441 may be greater than the thickness of the first friction actuating portion 131, and the depth of the second groove 451 may be greater than the thickness of the second friction actuating portion 132, such that the first groove 441 forms a guide groove for guiding the first driving element 42, and the second groove 451 forms a guide groove for guiding the second driving element 43 to move.

That is, when the depth of the first groove 441 is larger than the thickness of the first friction actuating portion 131, the first groove 441 not only forms a receiving groove for receiving the first friction actuating portion 131, but also forms a guide groove for guiding the first driving element 42; when the depth of the second groove 451 is larger than the thickness dimension of the second friction actuating portion 132, the second groove 451 not only forms a receiving groove for receiving the second friction actuating portion 132, but also forms a guide groove for guiding the second driving element 43.

Fig. 9 illustrates a schematic diagram of yet another variant implementation of the variable focus camera module according to an embodiment of the present application. As shown in fig. 9, in this modified embodiment, the first carrier 44 has a first groove 441 concavely formed in a side surface thereof and extending laterally, and the second carrier 45 has a second groove 451 concavely formed in a side surface thereof and extending laterally, wherein the first friction actuating portion 131 is disposed in the first groove 441 such that the first friction actuating portion 131 is more stably disposed between the first drive element 42 and the first carrier 44, and the second friction actuating portion 132 is disposed in the second groove 451 such that the second friction actuating portion 132 is more stably disposed between the second drive element 43 and the second carrier 45.

In particular, in this variant embodiment, the friction driving part 120 of the first driving element 42 is fitted in the first recess 441 and the friction driving part 112 of the second driving element 43 is fitted in the second recess 451, that is, in this embodiment, the first recess 441 not only forms a housing groove for housing the first friction actuating part 131 but also forms a guide groove for guiding the first driving element 42; the second groove 451 not only forms a receiving groove for receiving the second friction actuating portion 132, but also forms a guide groove for guiding the second driving member 43.

Also, in this variant embodiment, the first groove 441 has a reduced caliber, and/or the second groove 451 has a reduced caliber. That is, in this modified embodiment, the aperture size of the first groove 441 gradually decreases in a direction away from the first driving element 42 along the width direction of the first carrier 44, and the aperture size of the second groove 45 gradually decreases in a direction away from the second driving element 43 along the width direction of the second carrier 45.

It should be appreciated that after a period of operation of the first drive element 42 and the second drive element 43, the friction drive portions 112 of the first drive element 42 and the second drive element 43 may wear. Accordingly, under the action of the first pre-pressing part 50 and the second pre-pressing part 60, the friction driving part 112 of the first driving element 42 extends further inward from the first groove 441, and the friction driving part 112 of the second driving element 43 extends further inward from the second groove 451, so that, since the first groove 441 has a reduced caliber and the second groove 451 has a reduced caliber, the friction driving part 112 of the first driving element 42 can again abut against the first friction actuating part 131 disposed in the first groove 441, and the friction driving part 112 of the second driving element 43 can again abut against the second friction actuating part 132 disposed in the second groove 451, in such a way, the service lives of the first driving element 42 and the second driving element 43 can be prolonged, i.e., the service life of the zoom lens module can be prolonged.

In summary, the variable focus camera module according to the embodiments of the present application is illustrated, wherein the variable focus camera module employs the piezoelectric actuator 100 as a driver to provide not only a sufficiently large driving force, but also a driving performance with higher precision and longer stroke to meet the zooming requirement of the variable focus camera module.

Further, in the embodiment of the present application, the piezoelectric actuator 100 has a relatively small size to better adapt to the trend of making the camera module lighter and thinner. Moreover, the variable-focus camera module adopts a reasonable layout scheme to arrange the piezoelectric actuators 100 in the variable-focus camera module so as to meet the structural and dimensional requirements of the variable-focus camera module.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments, and any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. The utility model provides a module of making a video recording of zooming which characterized in that includes:

a photosensitive member held on a light passage of the zoom lens group; and

the first driving element and the second driving element are implemented as piezoelectric actuators, the first driving element is frictionally coupled to the first carrier through the first pre-pressing part and is configured to move in a two-dimensional track along the direction set by the optical axis in a manner of bending vibration along two directions after being driven, so that the first carrier is driven by friction to drive the zooming part to move along the direction set by the optical axis; the second driving element is frictionally coupled to the second carrier through the second pre-pressing portion and configured to move in a two-dimensional trajectory along the direction set by the optical axis in a manner of bending vibration along two directions after being driven, so as to drive the second carrier through friction to drive the focusing portion to move along the direction set by the optical axis.

2. The variable focus camera module of claim 1, wherein said piezoelectric actuator comprises: the device comprises an actuating system and a driving circuit system, wherein the actuating system moves in a two-dimensional track along a preset direction in a mode of bending vibration along two directions under the control of the driving circuit system.

3. The variable focus camera module of claim 2, wherein said actuation system comprises: a piezoelectric plate structure and a friction drive portion fixed to the piezoelectric plate structure, the friction drive portion being frictionally coupled to the first carrier or the second carrier.

4. The variable focus camera module of claim 3, wherein the piezoelectric plate structure has a first side surface extending along its depth direction and a second side surface extending along its height direction and adjacent to the first side surface, wherein the piezoelectric plate structure has a first resonant frequency along its depth direction and a second resonant frequency along its height direction, wherein the second resonant frequency is greater than the first resonant frequency.

5. The variable focus camera module of claim 4, wherein the piezoelectric plate structure comprises a first piezoelectric region, a second piezoelectric region, and a third piezoelectric region formed on the second side surface, and a fourth piezoelectric region formed on the first side surface, wherein the second piezoelectric region is between the first piezoelectric region and the third piezoelectric region, and the fourth piezoelectric region is adjacent to the second piezoelectric region; wherein the piezoelectric plate structure further comprises a first electrode pair electrically connected to the first piezoelectric region, a second electrode pair electrically connected to the second piezoelectric region, a third electrode pair electrically connected to the third piezoelectric region, and a fourth electrode pair electrically connected to the fourth electrical connection region.

6. The variable focus camera module of claim 5, wherein the drive circuitry comprises a first drive circuit and a second drive circuit, the first drive circuit being electrically connected to the first electrode pair and the third electrode pair, the second drive circuit being electrically connected to the second electrode pair and the fourth electrode pair; wherein the circuit vibration signal vibration frequency output by the first driving circuit and the second driving circuit is equal to the first resonance frequency or the second resonance frequency.

7. The variable focus camera module according to claim 6, wherein when the vibration frequency of the circuit vibration signal output by the first driving circuit is the first resonance frequency, the piezoelectric plate structure resonates in the height direction thereof and partially resonates in the depth direction thereof, so that the piezoelectric plate structure moves along a preset direction in a two-dimensional trajectory in a manner of bending vibration in two directions; when the vibration frequency of the circuit vibration signal input by the second driving circuit is the second resonance frequency, the piezoelectric plate structure resonates in the depth direction and partially resonates in the height direction, so that the piezoelectric plate structure moves along a two-dimensional track along a preset direction in a manner of bending vibration along two directions.

8. The variable focus camera module of claim 7, wherein the driving assembly further comprises a first friction actuating portion and a second friction actuating portion, the first friction actuating portion being clampingly disposed between the friction driving portion of the first driving element and the first carrier so that the first driving element is frictionally coupled to the first carrier by the first friction actuating portion and the first pre-pressing means; the second friction actuating portion is sandwiched between the friction driving portion of the second driving element and the second carrier to be frictionally coupled to the second carrier by the second pre-pressing part and the second friction actuating portion.

9. The variable focus camera module according to claim 8, wherein the first pre-pressing member comprises a first elastic element, the first elastic element is disposed between the piezoelectric plate structure of the first driving element and the driving housing, so that the friction driving portion of the first driving element is forced to the first friction actuating portion by an elastic force of the first elastic element, and the first driving element is frictionally coupled to the first carrier; the second pre-pressing element comprises a second elastic element, the second elastic element is arranged between the piezoelectric plate structure of the second driving element and the driving shell, so that the friction driving part of the second driving element is forced to abut against the second friction actuating part through the elastic force of the second elastic element, and the second driving element is frictionally coupled to the second carrier.

10. The variable focus camera module of claim 9, wherein said first and second elastic elements are implemented as an adhesive having elasticity.

11. The variable focus camera module of claim 10, wherein the thickness dimension of the first and second elastic elements is between 10um and 50 um.

12. The variable focus camera module of claim 8, wherein the first carrier comprises a first groove concavely formed in a surface thereof, the first friction actuating portion being disposed in the first groove, wherein the first groove forms a guide slot for guiding movement of the friction driving portion of the first drive element.

13. The variable focus camera module of claim 12, wherein the second carrier comprises a second groove concavely formed in a surface thereof, the second friction actuating portion being disposed in the second groove, wherein the second groove forms a guide slot for guiding movement of the friction driving portion of the second drive element.

14. The variable focus camera module of claim 13, wherein the first recess has a reduced aperture and/or the second recess has a reduced aperture.

15. The zoom camera module of claim 8, wherein the first pre-pressing member comprises a first magnetic attraction element disposed on the first carrier and a second magnetic attraction element disposed on the driving housing and corresponding to the first magnetic attraction element, so that a friction driving portion of the first driving element is forced to abut against the first friction actuating portion by a magnetic force between the first magnetic attraction element and the second magnetic attraction element, and the first driving element is frictionally coupled to the first carrier; the second pre-pressing part comprises a third magnetic attraction element arranged on the second carrier and a fourth magnetic attraction element arranged on the driving shell and corresponding to the third magnetic attraction element, so that the friction driving part of the second driving element is forced to abut against the second friction actuating part through the magnetic acting force between the third magnetic attraction element and the third magnetic attraction element, and the second driving element is frictionally coupled to the second carrier in such a way.

16. The variable focus camera module of claim 8, wherein said first drive element and said second drive element are provided simultaneously on a first side of said variable focus lens group.

17. The variable focus camera module of claim 16, wherein said first and second drive elements are disposed in alignment with each other on a first side of said variable focus lens group.

18. The variable focus camera module of claim 16, wherein the first drive element is disposed between a side surface of the first carrier and a side surface of the drive housing, and the second drive element is disposed between a side surface of the second carrier and a side surface of the drive housing.

19. The variable focus camera module of claim 16, wherein said first drive element is disposed between a bottom surface of said first carrier and a bottom surface of said drive housing, and said second drive element is disposed between a bottom surface of said second carrier and a bottom surface of said drive housing.

20. The variable focus camera module of claim 16, wherein the drive assembly further comprises a guide structure disposed on a second side of the zoom lens group opposite the first side, the guide structure configured to guide the focusing portion and the zooming portion to move along the optical axis.

21. The variable focus camera module of claim 20, wherein said guide structure comprises: the optical axis of the first carrier is parallel to the optical axis, so that the first carrier and the second carrier can be guided to move along the guide rod parallel to the optical axis.

22. The variable focus camera module of claim 20, wherein said guide structure further comprises a first guide mechanism disposed between said first carrier and said drive housing and a second guide mechanism disposed between said second carrier and said drive housing, wherein said first guide mechanism is configured to guide movement of said zoom portion along the optical axis and said second guide mechanism is configured to guide movement of said focus portion along the optical axis.

23. The variable focus camera module of claim 22, wherein the first guide mechanism comprises at least one ball disposed between the first carrier and the drive housing, and a receiving slot disposed between the first carrier and the drive housing for receiving the at least one ball; the second guide mechanism comprises at least one ball arranged between the second carrier and the driving shell, and an accommodating groove arranged between the second carrier and the driving shell and used for accommodating the at least one ball.

24. The variable focus camera module of claim 22, wherein said first guide mechanism comprises: the sliding rail is arranged between the driving shell and the first carrier and is suitable for the sliding of the sliding block; the second guide mechanism includes: the sliding rail is arranged between the driving shell and the second carrier and is suitable for the sliding of the sliding block.

25. The variable focus camera module of claim 1, further comprising: and the light turning element is used for turning the imaging light to the zoom lens group.

26. The variable focus camera module of claim 1, wherein the focusing portion and the zooming portion are disposed adjacent.