CN109073989B - Camera module and mobile terminal - Google Patents

Abstract

The utility model provides a module and mobile terminal make a video recording, this module includes: the supporting plate is arranged on the substrate; the shell is hermetically connected with the supporting plate; the lens assembly includes: an image sensor and a lens; the voice coil driving device includes: the permanent magnet is fixedly connected with the lens, and the electromagnet coil surrounds the permanent magnet and is fixedly connected with the supporting plate; the image sensor is arranged between the substrate and the supporting plate; the lens is positioned in a space formed by the shell and the sealing plate, and liquid for providing buoyancy for the lens and the permanent magnet is filled in the shell. In the technical scheme, the electromagnet coil is externally arranged so as to facilitate heat dissipation, the buoyancy of the liquid is used as partial or whole force for overcoming the gravity of the lens and the permanent magnet, and no matter which position the lens is located, when the magnetic force of the electromagnet coil and the permanent magnet is used as force for providing partial gravity, the energy consumption is reduced, and the condition of the image pickup effect is improved.

Description

Camera module and mobile terminal

The present application claims priority of chinese patent application with application number 201710064653.X entitled "a camera module" filed by the chinese patent office on 4/2/2017, the entire contents of which are incorporated herein by reference.

Technical Field

The application relates to the technical field of camera shooting, in particular to a camera shooting module and a mobile terminal.

Background

The photographing is one of the important functions of the mobile phone next to the call, and the photographing scene is also the scene with the most serious problem of the heat of the mobile phone. The average power consumption of the camera module of the mobile phone accounts for about 30 percent (about 1W) of the power consumption of the whole mobile phone in the photographing process, and a local heating point is very easy to form on the shell due to the small size and high power consumption of the module. The local temperature of the corresponding shell position of the camera module is very high and exceeds the tolerance limit of a human body.

The camera module generally comprises a lens, a voice coil driving device, an image sensor, a printed circuit board and other main components. The voice coil driving device and the image sensor are main heating devices, the voice coil driving device and the image sensor respectively account for half of the power consumption of the module, and when the temperature of the camera module rises, a plurality of photographing performances such as focusing speed, image definition and the like can be obviously influenced.

Disclosure of Invention

The embodiment of the application provides a camera module and a mobile terminal, which are used for improving the heat dissipation effect of the camera module and improving the imaging quality of the camera module.

In a first aspect, a camera module is provided, which includes: the voice coil driving device comprises a substrate, a supporting plate, a lens assembly, a voice coil driving device and a shell; wherein,

the supporting plate is arranged on the substrate;

the shell is connected with the supporting plate in a sealing mode;

the lens assembly includes: the device comprises an image sensor and a lens for transmitting light rays to the image sensor;

the voice coil driving apparatus includes: the lens driving device comprises a permanent magnet fixedly connected with the lens and an electromagnet coil surrounding the permanent magnet and fixedly connected with the supporting plate, wherein when the electromagnet coil supplies power, a magnetic field formed between the electromagnet coil and the permanent magnet provides driving force or braking force for the lens;

the image sensor is arranged between the substrate and the supporting plate; the lens is positioned in a space formed by the shell and the sealing plate, and liquid for providing buoyancy for the lens and the permanent magnet is filled in the shell.

In the above technical scheme, through adopting the external mode of setting of electromagnet coil, electromagnet coil's heat dissipation has been made things convenient for, and, fill up liquid through the adoption in the casing, buoyancy through this liquid is as the partial or whole power of overcoming the gravity of camera lens and permanent magnet, and when adopting buoyancy, no matter which position the camera lens is in, buoyancy size can not change, consequently, even when needing the magnetic force of electromagnet coil and permanent magnet as providing the power that partly overcome gravity, the electric current of electromagnet coil also can not be when the position of keeping away from image sensor because the camera lens, and need increase current, and then reduce the energy consumption, the condition that influences the effect of making a video recording because the temperature is too high in the module of making a video recording has been improved.

In a specific embodiment, the ratio of the density of the liquid to the density of the structure of the lens and the permanent magnet is within a set first threshold. The liquid can be ensured to provide enough buoyancy, and the energy consumption of the electromagnet coil when the lens is driven is reduced.

In a specific embodiment, the first set threshold is 95% to 105%. I.e. the set threshold may be a threshold of different size.

In a specific embodiment, the housing and the supporting plate are respectively provided with a sealing lens matched with the lens, the sealing lens is a flat lens, the supporting plate and the substrate are connected in a sealing manner, and a space for accommodating the image sensor is enclosed between the substrate and the supporting plate. The flat lens has no convergence or diffusion effect on light. The quality of making a video recording is guaranteed effectively. Meanwhile, a sealing space is formed between the supporting plate and the substrate, so that liquid leakage can be prevented, and dust can be prevented from entering the image sensor to influence the photographing function.

In a specific embodiment, the liquid has a density of 0.2 to 2g/cm 3. In this liquid, any density can be selected, as long as the above range requirements are satisfied. In a specific embodiment, the liquid may have different choices, and may be a single substance, such as distilled water, or a solution, which is a solution with known material, and the solubility of the solution may be configured according to actual needs. Furthermore, the liquid may also be a colorless or colored solution. In a specific embodiment, the liquid is a colorless transparent solution, and the sealing lens between the lens and the image sensor is an optical filter. In this scheme, since the liquid is a colorless transparent solution, a filter is required to be disposed in front of the lens and the image sensor for filtering light. In another specific embodiment, the liquid is a colored transparent liquid, which can act as a filter when light is irradiated to the colored transparent liquid.

In a specific embodiment, the number of the electromagnet coils is multiple, and the plurality of electromagnet coils are uniformly arranged around the permanent magnet. The posture of the lens is convenient to regulate, and in a more specific embodiment, the number of the electromagnet coils is three or four. Or a different number of five, six, etc. may be used. And when the electromagnetic coil is specifically arranged, the interval between any adjacent electromagnetic coils is the same so as to enclose a cylindrical space. And one surface of each electromagnet coil facing the permanent magnet is an inwards concave arc surface.

In a specific embodiment, the permanent magnet is oval, and a through hole for sleeving the lens is arranged on the permanent magnet. In addition, two or more than two permanent magnets can be embedded at the periphery of the lens to be spliced into an ellipsoid. The ellipsoid is the principle of imitating the eyeball of a human or an animal, has small resistance when moving in a liquid environment, is beneficial to making small translation or rotation towards all directions and is convenient for posture adjustment.

In a specific embodiment, the electromagnetic coil fixing device further comprises a plurality of supporting columns arranged on the edge of the supporting plate and located in the shell, and each supporting column is used for fixing one electromagnetic coil. The electromagnet coil is supported by the support column. In addition, the electromagnet coil can be fixed by adhering the electromagnet coil to the support plate.

In a specific embodiment, the device further comprises a plurality of Hall devices which are arranged on the supporting plate and used for detecting the posture of the permanent magnet. The monitoring of the posture of the lens can be realized through the Hall device, and the posture of the lens can be conveniently adjusted.

In a specific embodiment, the housing is made of a heat conducting material, and each electromagnet coil is in pressing contact with the inner wall of the housing. The heat that the electro-magnet coil produced can be gone out through the casing conduction, and the heat dissipation of being convenient for, the preferred, this casing can be the casing of the better non-metallic material preparation of metal material or heat conductivity, and when adopting metal casing, this metal casing can be iron-clad, aluminum hull or copper shell, and existing intensity protection lens subassembly also has good heat-conduction effect.

In a second aspect, a mobile terminal is provided, where the mobile terminal includes any one of the camera modules described above, and a motherboard chip, where the motherboard chip controls power supply to the electromagnet coil to drive the lens to move or brake the lens.

In the above technical scheme, through adopting the external mode of setting of electromagnet coil, electromagnet coil's heat dissipation has been made things convenient for, and, fill up liquid through the adoption in the casing, buoyancy through this liquid is as the partial or whole power of overcoming the gravity of camera lens and permanent magnet, and when adopting buoyancy, no matter which position the camera lens is in, buoyancy size can not change, consequently, even when needing the magnetic force of electromagnet coil and permanent magnet as providing the power that partly overcome gravity, the electric current of electromagnet coil also can not be when the position of keeping away from image sensor because the camera lens, and need increase current, and then reduce the energy consumption, the condition that influences the effect of making a video recording because the temperature is too high in the module of making a video recording has been improved.

In a specific embodiment, when the camera module has the hall device, the main board chip is further configured to control to supply power to the electromagnet coil and brake the lens when the hall device detects that the lens moves to a set position.

In a specific embodiment, the motherboard image sensor is further configured to control the current required to maintain the position of the lens to be supplied to the electromagnet coil when the density of the liquid is not equal to the density of the structure formed by the lens and the permanent magnet. The posture of the lens can be ensured through a smaller current, and the heat production quantity of the camera module is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a camera module according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the camera module shown in FIG. 1;

fig. 3 is an exploded view of the camera module shown in fig. 1.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

As shown in fig. 1, 2 and 3, fig. 1 shows an external structure of a camera module according to an embodiment of the present application, fig. 2 shows an internal component matching structure thereof, and fig. 3 shows structures of respective components.

The embodiment of the application provides a camera module, which comprises a substrate 30, wherein the substrate 30 can be a printed circuit substrate, the end part of the printed circuit substrate is connected with a flexible circuit board 31 in order to facilitate the connection of the camera module and other components of a mobile terminal, and one end of the flexible circuit board 31 is provided with a connector. In addition, the camera module further includes a supporting plate 21, the supporting plate 21 is disposed on the substrate 30, and the supporting plate 21 and the housing 10 are hermetically connected and enclose a sealed space, and further, the camera module further includes a lens assembly and a voice coil driving device, the sealed space enclosed by the supporting plate 21 and the housing 10 is used for accommodating the lens 60 and the voice coil driving device in the lens assembly, and the space is filled with a liquid for providing buoyancy for the lens 60 and the permanent magnet 50 (a part of the voice coil driving device), when the camera module is specifically disposed, the lens 60 and the voice coil driving device in the lens assembly are respectively disposed in the housing 10, and the housing 10 and the supporting plate 21 are respectively provided with a sealing lens 40 matched with the lens 60, and both the sealing lenses 40 are flat lenses. The flat lens has no convergence or diffusion effect on light. Avoiding the influence on the imaging. The voice coil driving device includes: the lens driving device comprises a permanent magnet 50 fixedly connected with the lens 60 and an electromagnet coil 80 surrounding the permanent magnet 50 and fixedly connected with the support plate 21, wherein when the electromagnet coil 80 is powered, a driving force or a braking force is provided for the lens 60 through a magnetic field formed between the electromagnet coil 80 and the permanent magnet 50.

The lens assembly includes, in addition to a lens 60, an image sensor 70, the lens 60 being adapted to transmit the captured light to the image sensor 70, and in use, the light passes through the sealing lens 40 on the housing 10 and then irradiates the lens 60, and passes through the sealing lens 40 on the support plate 21 and then enters the image sensor 70. In a specific arrangement, the image sensor 70 is disposed between the substrate 30 and the supporting plate 21, and is connected to the substrate 30 to convert the optical signal transmitted from the lens 60 into an electrical signal and transmit the electrical signal to the substrate 30, in a specific embodiment, the supporting plate 21 is connected to the substrate 30 in a sealing manner, and a space for accommodating the image sensor 70 is defined between the substrate 30 and the supporting plate 21, that is, the image sensor 70 is sealed, so that dust can be effectively prevented from entering the image sensor 70, thereby preventing the dust from affecting the photographing function.

When installed, the lens 60 is suspended in a liquid. The voice coil driving device is a device that provides driving force by magnetic force, and includes a permanent magnet 50 fixedly connected to the lens 60, and a plurality of electromagnet coils 80 disposed around the permanent magnet 50 and fixedly connected to the supporting plate 21, as shown in fig. 2 and 3, in a specific embodiment, the number of the electromagnet coils 80 is four, the substrate 30 and the housing 10 are rectangular, and the four electromagnet coils 80 are located at four corners of the supporting plate 21. When the electromagnet coil 80 is energized, a force is applied to the lens 60 by a magnetic field formed between the electromagnet coil 80 and the permanent magnet 50. Specifically, the electromagnet coil 80 forms an electromagnet when energized and generates a magnetic field, and the permanent magnet 50 located in the magnetic field is forced by the magnetic force to start moving. In specific control, when the direction of the magnetic field generated by the electromagnet changes, the permanent magnet 50 is attracted by the electromagnet or repelled by the electromagnet, so that the direction of the magnetic field of the electromagnet can be changed by changing the direction of the current in the electromagnet coil 80, and attraction or repulsion between the electromagnet coil 80 and the permanent magnet 50 is further realized. Since the permanent magnet 50 is fixed on the lens 60 and the electromagnet coil 80 is fixedly connected with the supporting plate 21, the movement of the lens 60 can be controlled by controlling the direction and magnitude of the current of the electromagnet coil 80. In addition, each electromagnet coil 80 can be set with different current magnitude and direction at will, so as to realize the translation of the lens 60 in any direction and the rotation of any angle. When this arrangement is adopted, since the electromagnet coil 80 is located at the periphery, the generated heat is more easily dissipated. In addition, when the electromagnetic heating device is specifically configured, in order to further facilitate heat dissipation, the housing 10 is made of a heat conductive material, and each of the electromagnet coils 80 is in pressing contact with an inner wall of the housing 10. The heat that electromagnet coil 80 produced can be conducted away through casing 10, is convenient for dispel the heat, and wherein, this casing 10 can be the casing of the better non-metallic material preparation of metal material or heat conductivity, and when adopting metal casing, this metal casing can be iron-clad, aluminum hull or copper shell, and existing intensity protection lens subassembly also has good heat-conduction effect.

In the above structure, the lens 60 and the permanent magnet 50 fixedly connected thereto are suspended in the liquid, and the suspension may be realized by the buoyancy of the liquid completely or by the combined action of the buoyancy and the magnetic force. The different embodiments described above are based on the buoyancy of the liquid, and the volume of the discharged water is known from the principle of buoyancy, and the volume of the discharged water is determined by the relationship between the density of the liquid and the density of the structure composed of the lens 60 and the permanent magnet 50, since the liquid fills the space surrounded by the entire housing 10 and the substrate 30 in the present application, and the volume of the discharged water is the same as the volume thereof, and thus the relationship between the density of the liquid and the density of the structure composed of the lens 60 and the permanent magnet 50 is determined without requiring magnetic force. When the density of the liquid is equal to the density of the structure composed of the lens 60 and the permanent magnet 50, the lens 60 and the permanent magnet 50 can be suspended in the liquid by the buoyancy of the liquid without the force provided by the electromagnet coil 80, but in this method, the requirement for accuracy is high, and it is necessary to ensure that the density of the liquid is completely the same as that of the structure composed of the lens 60 and the permanent magnet 50. However, this approach has the advantage of eliminating the need for additional magnetic force to maintain the lens 60 in the desired position when it is moved. Therefore, power supply to the solenoid coil 80 is not required to provide force when the lens 60 is stabilized, thereby reducing power consumption of the solenoid coil 80 and, at the same time, reducing heat generation. In this way, when the lens movement needs to be controlled, the main board chip of the mobile terminal supplies power to the electromagnet coil 80, the magnetic force between the electromagnet coil 80 and the permanent magnet 50 provides a driving force for the lens 60, and when the lens 60 moves to a set position, the main board chip supplies a reverse current to the electromagnet coil 80, so that the electromagnet coil 80 provides a reverse braking force, that is, when the lens 60 is controlled to move, only one driving force and one reverse braking force need to be provided by the electromagnet coil 80, and when the driving force is provided, since the lens 60 and the permanent magnet 50 are in any position in the liquid, the buoyancy is the same and equal to the gravity of the lens 60 and the permanent magnet 50, when the driving force is provided, the lens 60 can be driven to move only by supplying a very short time of current to the electromagnet coil 80, and after the lens 60 moves, no further force need be provided. Compared with the prior art, the electromagnet in the prior art needs to provide force to overcome the elastic force of the spring all the time, and the elastic force of the spring changes along with the change of the position of the lens 60, so that the current supplied by the electromagnet needs to be changed at any time. Therefore, the power consumption of the electromagnet coil 80 can be reduced to a great extent by adopting the scheme of the application.

When the other method is adopted, that is, the structure composed of the lens 60 and the electromagnet coil 80 is suspended by the combined action of buoyancy and magnetic force, at this time, there is a certain difference between the density of the structure composed of the lens 60 and the permanent magnet 50 and the density of the liquid, and when the lens 60 needs to be kept at the position, the electromagnet coil 80 needs to provide a certain magnetic force to overcome gravity (the density of the liquid is less than that of the structure composed of the lens 60 and the permanent magnet 50) or buoyancy (the density of the liquid is greater than that of the structure composed of the lens 60 and the permanent magnet 50). Specifically, the force required to be provided by the voice coil driving device is obtained according to the difference between the gravity and the buoyancy of the lens 60 and the permanent magnet 50 during the design, and the main board chip of the mobile terminal controls the current required to be input into the electromagnet coil 80 to supply the force. The principle of the present embodiment is similar to the above principle, and only the electromagnet coil 80 needs to be powered to provide an additional force for keeping the lens 60 and the permanent magnet 50 suspended. Although the electromagnet coil 80 is required to be additionally supplied with power in the scheme, when the scheme is adopted, the requirement on the processing precision of the device is low because the density of the liquid can be different from the density of the structure formed by the lens 60 and the permanent magnet 50. When large-scale production, because lens 60 and permanent magnet 50 are adding man-hour, inevitable existence machining error and assembly error to the density of liquid also can't guarantee completely unanimous, consequently, adopt the mode of this scheme, can provide power through electromagnet coil 80 and carry out an adjustment, guarantee that lens 60 and permanent magnet 50 suspend in liquid, when the error appears, only need adjust the electric current of supplying electromagnet coil 80 can, be convenient for large-scale production. In addition, compared with the prior art, the above solution only needs to make the difference between the density of the liquid and the density of the structure composed of the lens 60 and the permanent magnet 50 within a certain range, and also has the effect of reducing heat generation.

It can be seen from the above description of the two different implementations of the lens 60 being suspended, in the present application, the density of the liquid may be the same as the density of the structure formed by the lens 60 and the permanent magnet 50, and there may also be a certain difference, in order to reduce the energy consumption of the camera module provided by the present application, that is, to reduce the heat generation amount, the density of the body may adopt a ratio of the density of the structure formed by the lens 60 and the permanent magnet 50 within a set first threshold, specifically, the first set threshold of the first threshold is 95% to 105%. If the ratio of the two is 95%, 98%, 100%, 102%, 105%, etc., it is arbitrarily between 95% -105%.

The liquid in the present application can be selected from a single substance, such as distilled water, and a solution, which is a solution with known material, and the solubility of the solution can be configured according to actual needs. Furthermore, the liquid may also be a colorless or colored solution. As shown in fig. 2 and fig. 3, in a specific embodiment, the liquid is a colorless transparent solution (not shown), in which case, the sealing lens 40 disposed between the lens 60 and the image sensor 70 and on the supporting plate 21 is a filter. In this embodiment, since the liquid is a colorless transparent solution, a filter needs to be disposed between the lens 60 and the image sensor 70 for filtering light. In another specific embodiment, the liquid is a colored transparent liquid that filters light passing therethrough when the light impinges on the colored transparent liquid. I.e. by using a colored transparent liquid as a filter, so that a transparent lens can be used as the sealing lens 40 between the lens 60 and the image sensor 70.

In addition, for the above liquid, a certain range of density can be selected, and in a specific embodiment, the density of the liquid is between 0.2 and 2g/cm3, such as 0.2g/cm3, 0.5g/cm3, 1g/cm3, 1.5g/cm3, 2g/cm3, and the like, and the density is optionally between 0.2 and 2g/cm 3.

As a more specific scheme, in order to facilitate the arrangement of the electromagnet coil 80, the camera module in the present application is further provided with a plurality of supporting pillars 22, the supporting pillars 22 and the supporting plate 21 form a bracket 20, and during the specific arrangement, the supporting pillars and the supporting plate in the bracket 20 are directly manufactured into the bracket 20 by an integral molding method.

In a specific arrangement, a plurality of support posts 22 are disposed at the edge of the support plate 21 and located in the housing 10, and each support post 22 is used for fixing one electromagnet coil 80. I.e. the number of support posts 22 provided and the electromagnet coils 80 employed. And the setting position is also determined according to the desired position of the electromagnet coil 80. In one particular embodiment, a plurality of electromagnet coils 80 are uniformly disposed around the permanent magnet 50. The posture of the lens 60 can be easily controlled, and in a more specific embodiment, the number of the electromagnet coils 80 is three or four, as shown in fig. 3, and fig. 3 shows a structure using four electromagnet coils 80. It will of course be appreciated that a different number of five, six etc. may be used. And in particular arrangement, any adjacent electromagnet coils 80 are equally spaced to define a cylindrical space. The cylindrical space is a space for defining the lens 60, and when the lens 60 is suspended in the liquid, the lens 60 is located in the cylindrical space so that the electromagnet coil 80 can have a good acting force with the permanent magnet 50 when being energized. In a specific arrangement, a surface of each electromagnet coil 80 facing the permanent magnet 50 is an arc surface that is concave. Correspondingly, one surface of the supporting column 22 facing the permanent magnet 50 is also an arc surface, and the plurality of arc surfaces are arc surfaces at different positions of the cylindrical surface. It should be understood that the concave arcuate surface formed as described above is only one specific embodiment and may be non-arcuate when specifically configured. With continued reference to fig. 3, it can be seen from fig. 3 that, in a specific embodiment, the support plate 21 is a rectangular support plate 21, and the number of the support columns 22 is four, and the four support columns 22 are respectively located at four corners of the support plate 21.

In addition, for fixing the electromagnet coil 80, besides the above-mentioned manner of using the supporting frame 22, a manner of directly bonding and fixing the electromagnet coil 80 on the supporting plate 21 may also be adopted, specifically, a manner of directly bonding the electromagnet coil 80 at the corner of the supporting plate 21 by using glue to form a space for accommodating the permanent magnet 50 is adopted.

For the above permanent magnet 50, one permanent magnet 50 may be adopted, or two or more permanent magnets may be embedded in the periphery of the lens 60 to form an ellipsoid. The ellipsoid is the principle of imitating the eyeball of a human or an animal, has small resistance when moving in a liquid environment, is beneficial to making small translation or rotation towards all directions and is convenient for posture adjustment.

When the posture is specifically adjusted, when the axial position of the lens 60 needs to be adjusted, the lens 60 is driven to move along the axial direction thereof by synchronously supplying power to the plurality of electromagnet coils 80, and when the lens 60 needs to move transversely, the lens 60 can be driven to rotate by supplying power to part of the electromagnet coils 80. In order to adjust the posture of the lens 60 conveniently, in the present application, the permanent magnet 50 is an oval shape, and a through hole for being sleeved on the lens 60 is provided on the permanent magnet 50.

More preferably, in order to facilitate the adjustment of the posture of the lens 60, a plurality of hall devices 90 for detecting the posture of the permanent magnet 50 are provided on the support plate 21 in the present application. The hall devices 90 are connected to the substrate 30, and the position of the lens 60 is detected according to the principle of the magnitude of the magnetic field force sensed by the hall devices 90, in a specific embodiment, as shown in fig. 3, the number of the hall devices 90 is four, the four hall devices 90 are arranged around the permanent magnet 50, the position of the lens 60 is judged according to the magnetic field force sensed by the hall devices 90 at different positions, the hall devices 90 transmit the detected signal to the substrate 30, and the substrate 30 transmits the detected signal to a main board chip of the mobile terminal, so that the current posture of the lens 60 is known.

As can be seen from the above description, in the present application, the camera module lens 60 is suspended in the sealed space (defined by the substrate 30 and the housing 10), and the position and the posture can be maintained without continuously powering on the coil or requiring a lower electric quantity, so that the power consumption of the voice coil driving device during the operation of the camera module is greatly reduced; in addition, the heating of the voice coil driving device is mainly joule heat generated after the coil is electrified, the positions of the coil and the permanent magnet 50 of the traditional voice coil driving device are exchanged, and the electromagnetic coil 80 and the metal shell are assembled to be more favorable for heat dissipation; in addition, the lubricating liquid in the voice coil driving device sealed cavity is lower than air thermal resistance, so that the thermal diffusion between the lens 60 and the voice coil driving device and between the lens and the shell 10 is facilitated, and the imaging quality of the camera module is prevented from being influenced by high-temperature distortion of the lens due to the accumulation of local heat.

In addition, this application still provides a mobile terminal, and this mobile terminal includes the module of making a video recording of above-mentioned arbitrary item to and mainboard chip, wherein, mainboard chip control supplies power in order to drive camera lens 60 motion or braking camera lens 60 for electromagnet coil.

In addition, when the camera module has the hall device 90, the main board chip is further configured to control to supply power to the electromagnet coil and brake the lens 60 or brake the lens 60 when the hall device 90 detects that the lens 60 moves to the set position.

It should be understood that the mobile terminal in the present application may be a common mobile terminal device such as a mobile phone, a tablet computer, or a VR device. In the above scheme, the heat dissipation of the electromagnet coil 80 is facilitated by adopting the arrangement mode that the electromagnet coil 80 is externally arranged, and the shell 10 is filled with liquid, the buoyancy of the liquid is used as partial or whole force for overcoming the gravity of the lens 60 and the permanent magnet 50, and when the buoyancy is adopted, the buoyancy cannot be changed no matter where the lens 60 is located, so that even when the magnetic force of the electromagnet coil 80 and the permanent magnet 50 is used as part of the force for overcoming the gravity, the current of the electromagnet coil 80 cannot be increased because the lens 60 is far away from the image sensor 70, the energy consumption is reduced, and the condition that the camera shooting effect is influenced due to the overhigh temperature in the camera shooting module is improved.

In one embodiment, the motherboard chip is further configured to control the current supplied to the solenoid coil 80 to maintain the position of the lens 60 when the density of the liquid is not equal to the density of the structure formed by the lens 60 and the permanent magnet 50. The posture of the lens 60 can be ensured by a small current, and the heat generation amount of the camera module is reduced.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims (16)

1. The utility model provides a module of making a video recording which characterized in that includes: the voice coil driving device comprises a substrate, a supporting plate, a lens assembly, a voice coil driving device and a shell; wherein,

the supporting plate is arranged on the substrate;

the shell is connected with the supporting plate in a sealing mode;

the lens assembly includes: the device comprises an image sensor and a lens for transmitting light rays to the image sensor;

the voice coil driving apparatus includes: the lens driving device comprises a permanent magnet fixedly connected with the lens and an electromagnet coil surrounding the permanent magnet and fixedly connected with a supporting plate, wherein when the electromagnet coil supplies power, a magnetic field formed between the electromagnet coil and the permanent magnet provides driving force or braking force for the lens;

the image sensor is arranged between the substrate and the supporting plate; the lens is positioned in a space formed by the shell and the supporting plate, and liquid for providing buoyancy for the lens and the permanent magnet is filled in the shell; the liquid is used for keeping the lens to move through buoyancy after the electromagnet coil provides driving force for the lens to move, the electromagnet does not need to provide force any more, and the position and the posture of a structure formed by the lens and the permanent magnet are kept through buoyancy after the electromagnet coil provides braking force.

2. The camera module of claim 1, wherein a ratio of a density of the liquid to a density of a structure formed by the lens and the permanent magnet is within a first predetermined threshold.

3. The camera module of claim 2, wherein the first set threshold is 95% -105%.

4. The camera module according to claim 1, wherein the housing and the supporting plate are respectively provided with a sealing lens engaged with the lens, the sealing lens is a flat lens, the supporting plate is hermetically connected with the substrate, and a space for accommodating the image sensor is enclosed between the substrate and the supporting plate.

5. A camera module according to any one of claims 1 to 3, wherein the density of the liquid is between 0.2 and 2g/cm 3.

6. The camera module of claim 1, wherein the liquid is a colorless and transparent solution, and the sealing lens between the lens and the image sensor is an optical filter.

7. The camera module of claim 1, wherein the liquid is a colored transparent liquid that filters light passing therethrough.

8. The camera module of claim 1, wherein the number of the electromagnet coils is plural, and the plural electromagnet coils are uniformly arranged around the permanent magnet.

9. The camera module of claim 8, wherein the number of the electromagnet coils is three or four.

10. The camera module of claim 1, wherein the permanent magnet is oval and is provided with a through hole for being sleeved on the lens.

11. The camera module of claim 1, further comprising support posts disposed at edges of the support plate and within the housing, each support post for securing one of the electromagnet coils.

12. The camera module of claim 1, further comprising a plurality of hall devices disposed on the support plate for detecting the attitude of the permanent magnet.

13. The camera module of claim 1, wherein the housing is made of a thermally conductive material, and each of the electromagnet coils is in pressing contact with an inner wall of the housing.

14. A mobile terminal, comprising the camera module according to any one of claims 1 to 13, and a motherboard chip, wherein the motherboard chip controls power supply to the electromagnet coil to drive the lens to move or brake the lens.

15. The mobile terminal of claim 14, wherein when the camera module has a plurality of hall devices, the motherboard chip is further configured to control power supply to the electromagnet coil and brake the lens when the hall devices detect that the lens moves to a set position.

16. The mobile terminal of claim 14, wherein the motherboard chip is further configured to control the electromagnet coil to supply a current required to maintain the position of the lens when the density of the liquid is not equal to the density of the structure formed by the lens and the permanent magnet.

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