CN114114589A

CN114114589A - Camera module with focusing, anti-shake and optical axis correcting functions

Info

Publication number: CN114114589A
Application number: CN202010886291.4A
Authority: CN
Inventors: 戎琦; 袁栋立; 刘佳; 刘傅文; 陈卓; 俞丝丝; 赵金军; 卞强龙
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2022-03-01
Anticipated expiration: 2040-08-28
Also published as: CN114114589B; WO2022042094A1

Abstract

The invention relates to a camera module, which comprises: a lens assembly; a first bearing seat; the second bearing seat is positioned at the outer side of the first bearing seat and is elastically connected with the first bearing seat; the fixing component is positioned at the outer side of the second bearing seat and is elastically connected with the second bearing seat; the first driving element is arranged between the first bearing seat and the second bearing seat and is suitable for driving the first bearing seat to move along the optical axis direction relative to the second bearing seat; and the second driving element is arranged between the second bearing seat and the fixed part and is suitable for driving the second bearing seat to rotate around a radial shaft relative to the fixed part, wherein the second bearing seat is provided with a reference surface vertical to the optical axis, and the radial shaft is a virtual axis on the reference surface. The invention also provides a corresponding method for correcting the optical axis inclination. The optical axis can be corrected, and the fact that the lens is hindered by the driving forces in the two directions to cause crosstalk is prevented.

Description

Camera module with focusing, anti-shake and optical axis correcting functions

Technical Field

The present application relates to an optical technology, and more particularly, to a camera module having functions of focusing, anti-shake, and optical axis correction.

Background

With the popularization of mobile electronic devices, technologies related to camera modules (for acquiring images, such as videos or images) applied to mobile electronic devices have been rapidly developed and advanced, and in recent years, camera modules have been widely applied to various fields, such as medical treatment, security, industrial production, and the like. In order to meet the increasingly wide market demands, the characteristics of the camera module, such as high pixel and high frame rate, are the irreversible development trend of the existing camera module.

Along with the promotion of the mobile phone photographing requirement, the camera module pixel is bigger and bigger, the sensitization chip area is bigger and bigger, the size that leads to whole camera lens module is corresponding increase also, the increase of camera lens module size leads to the equipment in-process camera lens optical axis slope problem serious, solves the optical axis slope problem and is especially outstanding urgent demand.

Disclosure of Invention

An object of the present invention is to overcome the deficiencies of the prior art and to provide a solution for a camera module with functions of focusing, anti-shake and optical axis correction.

In order to solve the above technical problem, the present invention provides a camera module, which includes: the lens assembly is provided with an optical axis; the lens assembly is arranged on the first bearing seat; the second bearing seat is positioned at the outer side of the first bearing seat, and the first bearing seat is elastically connected with the second bearing seat; the fixing component is positioned on the outer side of the second bearing seat, and the second bearing seat is elastically connected with the fixing component; the first driving element is arranged between the first bearing seat and the second bearing seat and is suitable for driving the first bearing seat to move along the optical axis direction relative to the second bearing seat; and the second driving element is arranged between the second bearing seat and the fixed part and is suitable for driving the second bearing seat to rotate around a radial shaft relative to the fixed part, wherein the second bearing seat is provided with a reference surface vertical to the optical axis, and the radial shaft is a virtual axis on the reference surface.

The first driving element comprises a coil arranged on the outer side surface of the first bearing seat and a magnet arranged on the inner side surface of the second bearing seat.

The second driving element comprises a coil arranged on the outer side surface of the second bearing seat and a magnet arranged on the inner side surface of the fixed part.

The outer side surface of the first bearing seat is provided with a first coil containing hole and a second coil containing hole which are symmetrical about an optical axis, and a first coil and a second coil are respectively arranged in the first coil containing hole and the second coil containing hole; the medial surface that the second bore the weight of the seat set up with first magnetite holding hole that first coil holding hole corresponds and with the second magnetite holding hole that second coil holding hole corresponds, set up in the first magnetite holding hole can with first coil interact's first magnetite, set up in the second magnetite holding hole can with second coil interact's second magnetite.

Wherein a third coil accommodating hole, a fourth coil accommodating hole, a fifth coil accommodating hole and a sixth coil accommodating hole are formed in the outer side surface of the second bearing seat, the third coil accommodating hole and the fifth coil accommodating hole are symmetrical with respect to the optical axis, the fourth coil accommodating hole and the sixth coil accommodating hole are symmetrical with respect to the optical axis, and a third coil, a fourth coil, a fifth coil and a sixth coil are respectively formed in the third coil accommodating hole, the fourth coil accommodating hole, the fifth coil accommodating hole and the sixth coil accommodating hole; the inner side surface of the fixing part is provided with a third magnet containing hole corresponding to the third coil containing hole, a fourth magnet containing hole corresponding to the fourth coil containing hole, a fifth magnet containing hole corresponding to the fifth magnet containing hole and a sixth magnet containing hole corresponding to the sixth coil containing hole, a third magnet capable of interacting with the third coil is arranged in the third magnet containing hole, a fourth magnet capable of interacting with the fourth coil is arranged in the fourth magnet containing hole, a fifth magnet capable of interacting with the fifth coil is arranged in the fifth magnet containing hole, and a sixth magnet capable of interacting with the sixth coil is arranged in the sixth magnet containing hole.

The second bearing seat is approximately rectangular in top view, and the third coil, the fourth coil, the fifth coil and the sixth coil are respectively positioned outside four corners of the second bearing seat.

The second bearing seat is approximately rectangular in top view, and the third coil, the fourth coil, the fifth coil and the sixth coil are respectively positioned on the outer sides of four sides of the second bearing seat.

Wherein, the first bearing seat and/or the second bearing seat are/is also provided with a displacement sensor.

The first bearing seat is connected with the second bearing seat through an integral elastic sheet, the elastic sheet comprises a first elastic section and a second elastic section, the first elastic section is connected with the first bearing seat and the second bearing seat, the second elastic section is connected with the second bearing seat and the fixed part, and the first elastic section is connected with the second elastic section through an elastic inflection point arranged on the second bearing seat.

The first bearing seat is connected with the second bearing seat through a first elastic sheet, and the second bearing seat is connected with the fixing part through a second elastic sheet.

The second bearing seat is provided with a magnetic shielding sheet between the magnet at the inner side and the coil at the outer side.

The camera module further comprises a third bearing seat arranged below the second bearing seat and elastically connected with the fixing part, and a third driving element is arranged between the third bearing seat and the second bearing seat and is suitable for driving the third bearing seat to move along the direction perpendicular to the optical axis.

The third driving element comprises four coils arranged on the third bearing seat and four magnets arranged on the second bearing seat.

The fixing part comprises a base, a motor shell and a frame positioned on the inner side of the motor shell, and the second driving element is arranged between the second bearing seat and the frame.

The fixing part comprises a base and a motor shell, and the second driving element is arranged between the second bearing seat and the motor shell.

Wherein the first drive element and/or the second drive element is a piezoelectric drive element.

Wherein the first drive element and/or the second drive element is an SMA drive element.

According to another aspect of the present application, there is also provided a method of correcting an optical axis tilt for a camera module, the camera module including: the lens assembly is provided with an optical axis; the lens assembly is arranged on the first bearing seat; the second bearing seat is elastically connected with the first bearing seat; the fixing component is positioned on the outer side of the second bearing seat, and the second bearing seat is elastically connected with the fixing component; the first driving element is arranged between the first bearing seat and the second bearing seat and is suitable for driving the first bearing seat to move along the optical axis direction relative to the second bearing seat; the second driving element is arranged between the second bearing seat and the fixed part and is suitable for driving the second bearing seat to rotate around a radial shaft relative to the fixed part, wherein the second bearing seat is provided with a reference surface perpendicular to the optical axis, and the radial shaft is a virtual axis on the reference surface;

the method of correcting the optical axis tilt includes: 1) after the camera module is assembled, measuring the inclination angle of the optical axis of the camera module; 2) a control module for calculating a current value to be input to the second drive element for correcting the inclination angle of the optical axis and writing the current value or a parameter representing the current value into the second drive element; and

3) when shooting is carried out by the camera module, the second driving element outputs initial driving current according to the written current value or the parameter representing the current value, the optical axis posture at the moment is taken as a reference posture, and subsequent shooting is carried out by the reference posture.

Wherein the subsequent photographing includes focusing or/and an anti-shake operation.

Wherein, the step 1) further comprises: setting a target plate, wherein the target plate is provided with a plurality of marks positioned in a target view field; measuring the axial position of an imaging point corresponding to the resolution force peak value of each mark; then obtaining an image plane inclination angle according to the measured axial position of the imaging point of each mark, and further obtaining an inclination angle of the optical axis of the camera module; the step 2) further comprises the following steps: and burning the current value or the parameter representing the current value into a register of the second driving element.

Wherein the step 2) comprises the following substeps: 21) calculating the current to be compensated according to the difference of the motor code values of the imaging points corresponding to the marks; 22) writing a compensation current to a register of the second drive element; and 23) sensing the actual movement of the lens assembly under the action of the compensation current by using a displacement sensor, calculating the inclination angle of the central axis of the lens assembly relative to a preset ideal optical axis, and finishing the step 2) when the inclination angle between the central axis of the lens assembly and the preset ideal optical axis is within a preset threshold value; otherwise, returning to the step 1) to recalculate the inclination angle of the optical axis.

Wherein the step 2) further comprises: 24) and after the compensation current is written in to correct the inclination angle of the optical axis, focusing is carried out again, and the clearest position is burnt.

Wherein the step 1) comprises: and moving the camera module in the axial direction, sensing the movement of four magnets positioned on the diagonal line of the second bearing seat by using a Hall element, and then calculating the included angle between the diagonal line of the second bearing seat and the horizontal plane.

Wherein the step 2) comprises: 21) calculating the inclination angle of the second bearing seat relative to the horizontal plane according to the included angle between the diagonal line of the second bearing seat corresponding to the single code value of the driving motor and the horizontal plane to obtain an inclination angle-code curve; the inclination angle-code curve is processed in a segmented mode, a code value interval corresponding to each section of curve is recorded, and compensation current for compensating the inclination angle in the code value interval is calculated; 22) then writing the compensation current and the corresponding code value interval into a register of the second driving element; and 23) sensing the actual movement of the lens assembly under the action of the compensation current by using a displacement sensor, calculating the inclination angle of the central axis of the lens assembly relative to a preset ideal optical axis, and finishing the step 2) when the inclination angle between the central axis of the lens assembly and the preset ideal optical axis is within a preset threshold value; otherwise, returning to the step 1) to recalculate the inclination angle of the optical axis.

Wherein the step 2) further comprises: 24) after the compensation current is written in, focusing is carried out again, and the clearest position is burnt; the step 3) further comprises the following steps: when the camera module is used for shooting, acquiring a current actual code value, and searching a corresponding written current value or a parameter representing the current value according to a section of an inclination angle-code curve where the current actual code value is located; and the second driving element outputs initial driving current according to the search result, takes the optical axis posture at the moment as a reference posture, and performs subsequent shooting according to the reference posture.

According to another aspect of the present application, there is also provided a method for correcting an optical axis tilt based on the aforementioned camera module, including the following steps: 1) after the camera module is assembled, measuring the inclination angle of the optical axis of the camera module; 2) a control module for calculating a current value to be input to the second drive element for correcting the inclination angle of the optical axis and writing the current value or a parameter representing the current value into the second drive element; and 3) when the camera module is used for shooting, the second driving element outputs an initial driving current according to the written current value or the parameter representing the current value, the optical axis posture at the moment is taken as a reference posture, and the subsequent shooting is carried out according to the reference posture.

Compared with the prior art, the application has at least one of the following technical effects:

1. in some embodiments of the application, the module of making a video recording has the function of focusing, anti-shake and correction optical axis simultaneously to the bearing seat that the coil place that will be used for correcting the optical axis slope is located separates with the bearing seat that the coil place that is used for focusing, can avoid the crosstalk phenomenon effectively, avoids the camera lens to receive the drive power of two directions promptly, leads to the phenomenon that the drive power of two directions hinders each other.

2. In some embodiments of the present application, by providing driving elements for performing different adjusting functions at corresponding positions of the two bearing seats and the fixing component, accurate control of focusing and correcting the optical axis can be achieved.

3. In some embodiments of the present application, the two bearing seats and the bearing seat and the fixing component are elastically connected, so that the relative motion between the two bearing seats and between the bearing seat and the fixing component can be simply and effectively realized.

4. In some embodiments of the present application, by providing a precise process flow and method for correcting an optical axis tilt, a precise correction of the optical axis tilt can be achieved.

5. In some embodiments of the present application, the bearing seat corresponding to the focusing function is separated from the bearing seat corresponding to the optical axis correction, and the optical axis inclination is detected and the corresponding motor code value capable of correcting the optical axis inclination is burned in the factory stage of the module, so that the module can move the lens along the optical axis on the premise of ensuring the optical axis collimation in the use stage (i.e., in the shooting state), thereby completing the focusing operation more accurately.

6. In some embodiments of the present application, the bearing seat corresponding to the focusing function is separated from the bearing seat corresponding to the optical axis correction, and the optical axis inclination is detected and the corresponding motor code value capable of correcting the optical axis inclination is burned in the factory-leaving stage of the module, so that the module can move the lens on the premise of ensuring the optical axis collimation in the use stage (i.e., in the shooting state), and the anti-shake operation can be completed more accurately.

7. In some embodiments of the present application, the driving elements for adjusting the tilt angle of the optical axis are disposed in the four corner regions of the bearing seat, and the driving elements for driving the lens to realize the focusing function are disposed in the two side regions of the bearing seat, so that the driving elements are staggered with respect to each other, thereby effectively reducing the radial space occupied by the motor. Radial here refers to a direction perpendicular to the optical axis.

8. In some embodiments of the application, the optical axis inclination can be detected through the factory stage of the module, and the corresponding motor code value is burnt to correct the optical axis inclination generated by the assembly tolerance of the lens, the motor and the photosensitive assembly, and when the module has a large-area photosensitive chip, the advantage is more remarkable.

Drawings

Fig. 1 is a perspective exploded view illustrating main components of a camera module according to an embodiment of the present application;

fig. 2 is a perspective exploded view illustrating a main component of the camera module according to an embodiment of the present application after a motor housing is removed;

fig. 3 is a perspective exploded view of the main components of the camera module according to another embodiment of the present application, with the motor housing removed;

FIG. 4 is a schematic perspective view illustrating an assembly relationship of components in the camera module according to an embodiment of the present application;

FIG. 5 is a schematic perspective view illustrating an assembly relationship of components in a camera module according to another embodiment of the present disclosure;

fig. 6 is a partial schematic view of a second carrier of the camera module according to an embodiment of the disclosure;

fig. 7 is an exploded perspective view of a camera module with a third carrying seat added in an embodiment of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that the expressions first, second, etc. in this specification are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, a first body discussed below may also be referred to as a second body without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of an object have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "including," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

As used herein, the terms "substantially," "about," and the like are used as terms of table approximation and not as terms of table degree, and are intended to account for inherent deviations in measured or calculated values that will be recognized by those of ordinary skill in the art.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Fig. 1 shows a schematic structural diagram of a camera module according to an embodiment of the present application. Referring to fig. 1, the camera module includes a lens assembly 1 and a motor assembly 2, which includes a first carrying seat 21 for carrying the lens module, a second carrying seat 22 located at a radial outer side of the first carrying seat, a driving part, and a fixing part 23. The first carrying seat 21 and the second carrying seat 22 are centered on the optical axis of the lens assembly 1, the second carrying seat 22 is elastically connected to the first carrying seat 21, and the second carrying seat 22 is elastically connected to the fixing member 23. The optical axis is defined as a virtual axis passing through the center of the lens assembly. According to one embodiment of the present application, as shown in fig. 1 to 4, the fixing part 23 includes a motor housing 24, a frame 25, and a base. The bearing seat is a hollow structure, a thread structure matched with each other can be arranged between the first bearing seat 21 and the lens component 1, and the bearing seat and the outer frame and the base of the fixing part are both separated by a certain distance, namely the bearing seat does not directly contact the fixing part.

According to an embodiment of the present application, as shown in fig. 2, a first coil receiving hole and a second coil receiving hole are provided at an outer side of the first carrier seat 21. The first coil receiving hole and the second coil receiving hole are respectively located at two opposite sides of the first bearing seat 21. The first coil 211 is disposed in the first coil-accommodating hole, the second coil 212 is disposed in the second coil-accommodating hole, and the first coil 211 and the second coil 212 are symmetrical about the optical axis. Accordingly, as shown in fig. 2 and 3, a first magnet accommodating hole is provided at a position corresponding to the first coil 211 inside the second carrier 22, a second magnet accommodating hole is provided at a position corresponding to the second coil 212 inside the second carrier 22, a first magnet 221 is provided in the first magnet accommodating hole, and a second magnet 222 is provided in the second magnet accommodating hole. When current is introduced into the first coil, the first coil generates a magnetic field, the first magnet is positioned in the magnetic field generated by the first coil, and Lorentz force which is mutually repulsive or attractive is generated between the first coil and the first magnet; when the second coil is electrified, the second coil generates a magnetic field, the second magnet is positioned in the magnetic field generated by the second coil, Lorentz force which is mutually repulsive or attractive is generated between the second coil and the second magnet, the first magnet and the second magnet are fixed, the Lorentz force drives the first coil and the second coil to move up and down along the optical axis, and through the interaction among the first coil, the second coil, the first magnet and the second magnet, the first bearing seat can be driven to move up and down along the optical axis, so that the lens assembly is driven to move up and down along the optical axis, and focusing is realized. According to an alternative embodiment of the application, more than two, for example four, coils may be provided on the outside of the first carrier 21 and correspondingly the same number of magnets may be provided on the inside of the second carrier. It is preferable to adopt a scheme in which two coils symmetrically distributed about the optical axis are disposed outside the first carrier base 21, which is advantageous to reduce the weight and volume of the camera module.

According to an embodiment of the present application, as shown in fig. 2 and 3, the third, fourth, fifth and sixth coil-receiving holes are provided at the outer side of the second carrier seat 22. A third coil 223 is disposed in the third coil-receiving hole, a fourth coil 224 is disposed in the fourth coil-receiving hole, a fifth coil 225 is disposed in the fifth coil-receiving hole, and a sixth coil 226 is disposed in the sixth coil-receiving hole. As shown in fig. 2 and 3, the third coil 223 and the fifth coil 225 are symmetrical with respect to the optical axis, and the fourth coil 224 and the sixth coil 226 are symmetrical with respect to the optical axis. Accordingly, a third magnet accommodating hole is provided at a position corresponding to the third coil 223, a fourth magnet accommodating hole is provided at a position corresponding to the fourth coil 224, a fifth magnet accommodating hole is provided at a position corresponding to the fifth coil 225, and a sixth magnet accommodating hole is provided at a position corresponding to the sixth coil 226 inside the fixing member 23 (the frame 24 or the motor case 25). A third magnet 231 is arranged in the third magnet accommodating hole, a fourth magnet 232 is arranged in the fourth magnet accommodating hole, a fifth magnet 233 is arranged in the fifth magnet accommodating hole, and a sixth magnet 234 is arranged in the sixth magnet accommodating hole. By electrifying the two coils which are symmetrical about the optical axis (the third coil and the fifth coil or the fourth coil and the sixth coil), the two electrified coils can interact with the corresponding magnets, so that the second bearing seat is driven to rotate around the axis which is vertical to the optical axis together with the first bearing seat and the lens assembly, the inclination of the optical axis of the lens can be adjusted, and the optical center can be calibrated.

According to an embodiment of the present application, as shown in fig. 2, the second carrier 22 is substantially rectangular in a top view (preferably, the second carrier 22 may be substantially square in a top view), and the third coil 223, the fourth coil 224, the fifth coil 225 and the sixth coil 226 are respectively disposed outside four side corners of the second carrier 22. Accordingly, the frame 24 is substantially rectangular in plan view (preferably, the frame 24 may be substantially square in plan view), and the third magnet 231, the fourth magnet 232, the fifth magnet 233, and the sixth magnet 234 are provided inside four corners of the frame 24, respectively. When current is supplied to the third coil 223, the third coil 223 generates a magnetic field, the third magnet 231 is positioned in the magnetic field generated by the third coil 223, and Lorentz force which is mutually repulsive or attractive is generated between the third coil 223 and the third magnet 231; when the current is applied to the fifth coil 225, the fifth coil 225 generates a magnetic field, the fifth magnet 233 is located in the magnetic field generated by the fifth coil 225, and the fifth coil 225 and the fifth magnet 233 generate a lorentz force that repels or attracts each other, so that the third coil 223 and the fifth coil 225 drive the second carrier 22 to rotate upward or downward around the a-axis (the line connecting the fourth coil 224 and the sixth coil 226) together with the first carrier 21 and the lens assembly 1. Similarly, when the current is applied to the fourth coil 224, the fourth coil 224 generates a magnetic field, the fourth magnet 232 is located in the magnetic field generated by the fourth coil 224, and the fourth coil 224 and the fourth magnet 232 generate a lorentz force that repels or attracts each other; when current is applied to the sixth coil 226, the sixth coil 226 generates a magnetic field, the sixth magnet 234 is located in the magnetic field generated by the sixth coil 226, and a lorentz force repelling or attracting each other is generated between the sixth coil 226 and the sixth magnet 234, so that the fourth coil 224 and the sixth coil 226 drive the second carrier 22 together with the first carrier 21 and the lens assembly 1 to move upward or downward around the b-axis (the line connecting the third coil 223 and the fifth coil 225). By this operation, the inclination of the optical axis of the lens can be adjusted to calibrate the optical center. In this embodiment, the plane on which the a-axis and the b-axis are located may be referred to as a reference plane, and the reference plane is substantially perpendicular to the optical axis of the lens assembly. The four coils are respectively arranged at the outer sides of the four side corners of the second bearing seat and correspondingly four magnets are arranged at the inner sides of the four side corners of the frame, so that the size of the motor can be reduced, and the size of the camera module is correspondingly reduced.

According to another embodiment of the present application, as shown in fig. 3, the second carrier 22 is substantially rectangular in a top view (preferably, the second carrier 22 may be substantially square in a top view), and the third coil 223, the fourth coil 224, the fifth coil 225 and the sixth coil 226 are respectively disposed outside four sides of the second carrier 22. Accordingly, the frame 24 is substantially rectangular in plan view (preferably, the frame 24 may be substantially square in plan view), and the third magnet 231, the fourth magnet 232, the fifth magnet 233, and the sixth magnet 234 are provided inside the four sides of the frame 24, respectively. Similar to the previous embodiment, when the current is applied to the coils to generate a magnetic field, the corresponding magnets are located in the magnetic field, and the magnets interact with the magnetic field to drive the driving coil to move up and down, so as to drive the second carrying seat 22, together with the first carrying seat 21 and the lens assembly 1, to move up and down around the c-axis (the connection line between the third coil 223 and the fifth coil 225) or the d-axis (the connection line between the fourth coil 224 and the sixth coil 226), which can also achieve the purpose of adjusting the tilt of the optical axis of the lens and calibrating the optical center. In this embodiment, the plane where the c-axis and the d-axis are located may be referred to as a reference plane, and the reference plane is substantially perpendicular to the optical axis of the lens assembly.

In order to adjust the tilt of the optical axis of the lens more precisely, more than four coils, for example, six or eight coils, symmetrical with respect to the optical axis may be provided outside the second carrier, and accordingly the same number of magnets may be provided inside the fixing member, thereby calibrating the optical center more precisely.

According to an embodiment of the present invention, as shown in fig. 5, a frame for mounting the magnets may be omitted, and the third magnet 231, the fourth magnet 232, the fifth magnet 233, and the sixth magnet 234 may be directly disposed inside the motor case, so that the motor size may be reduced, which is advantageous for the miniaturization of the module.

According to an embodiment of the present application, as shown in fig. 2 and 3, the first bearing seat 21 and the second bearing seat 22 and the fixing component 23 are connected by an integral spring 26, the spring 26 includes a first elastic segment 261 connecting the first bearing seat 21 and the second bearing seat 22 and a second elastic segment 262 connecting the second bearing seat 22 and the fixing component 23, and the first elastic segment 261 and the second elastic segment 262 are engaged by an elastic inflection point disposed on the second bearing seat 22. With this arrangement, a relative movement between the first carrier seat 21 and the second carrier seat 22 can be achieved, and a relative movement between the first carrier seat 21 together with the second carrier seat 22 and the fixing part 23 (the frame 24 or the motor housing 25) can be achieved. The whole elastic sheet is arranged, so that the assembly process flow can be simplified, and the size of the motor can be reduced.

According to another embodiment of the present application, two elastic pieces independent of each other are provided, the first carrying seat 21 and the second carrying seat 22 are elastically connected through the first elastic piece, and the second carrying seat 22 and the fixing component 23 are elastically connected through the second elastic piece.

The first carrier 21 may also be provided with a displacement sensor, for example a hall sensor. According to one embodiment of the present application, the hall sensor is disposed outside the first bearing seat 21. Preferably, the hall sensor is arranged on one side edge which is not provided with the coil containing hole, the hall sensor containing hole is arranged on the side edge, the hall sensor is arranged in the hall sensor containing hole, namely, four side edges outside the first bearing seat are provided with the containing holes on three side edges, two containing holes for placing the AF coil are arranged in opposite sides, and one of the other two side edges is provided with the containing hole for placing the hall sensor. Set up a hall sensor in hall sensor holding hole, bear one side that seat 22 corresponds with hall sensor holding hole at the second and set up a hall magnetite, through the cooperation of magnetite and sensor, hall sensor can sense the first position of bearing the actual removal of seat 21, with the first deviation of the position that bears the seat removal of predetermineeing, and feed back. By providing the hall sensor, the movement of the lens assembly can be driven more accurately.

The second carrier 22 may be provided with a displacement sensor, for example a hall sensor. The hall sensors can be arranged inside the coil outside the second carrier, at least two hall sensors being arranged on two adjacent coils, for example in the third coil and in the fourth coil. Taking the example of arranging the coils at the corners of the side edges of the second bearing seat, two hall sensors are arranged in the adjacent third coil and fourth coil, and the hall sensors can share two magnets with the third coil and the fourth coil, namely the third magnet and the fourth magnet, so that the relative motion between the coils and the magnets can be sensed and fed back when the second bearing seat rotates around the a shaft or the b shaft. Without additionally adding a Hall magnet, the position to which the second bearing seat actually moves is sensed and fed back. Similarly, for the embodiment in which the coil is provided in the side edge of the second carrier, two hall sensors may be provided inside two adjacent coils, for example, in the third coil and the fourth coil, and the hall sensors may share two magnets, i.e., the third magnet and the fourth magnet, with the third coil and the fourth coil, thereby sensing and feeding back the relative movement between the coil and the magnet when the second carrier rotates about the c-axis or the d-axis. Without additionally adding a Hall magnet, the position to which the second bearing seat actually moves is sensed and fed back.

According to one embodiment of the present application, the second carrier 22 has a magnetic shield sheet disposed between the magnet inside and the coil outside. Because the coil is arranged at the inner side of the second bearing seat, the magnet is arranged at the outer side, the inner coil is electrified to generate a magnetic field, the outer magnet is positioned in the magnetic field generated by the inner coil, the magnetic field enables the outer magnet to generate Lorentz force, namely the magnetic field generated by the inner coil interferes with the outer magnet, in order to avoid the mutual interference of the magnets of the inner coil and the outer coil of the bearing seat, a magnetism isolating sheet is arranged at the joint of the outer magnet of the second bearing seat and the bearing seat, and the magnetic field generated by the inner coil cannot interfere with the outer magnet, as shown in figure 6.

Because the coil that the drive lens subassembly moved up and down along the optical axis direction sets up in first bearing the seat, and the coil that the drive lens subassembly rotated around a, b (or c, d) axle sets up in the second bears the seat, and first bearing the seat and the second bears the seat to separate and set up, and the magnetic field that the coil that is located first bearing the seat produced separates each other with the magnetic field that the coil that is located the second bearing the seat produced, mutual noninterference between the magnetic field can avoid the crosstalk problem that the magnetic field produced. Meanwhile, in the prior art, the coil for driving the lens assembly to move up and down and the coil for driving the lens assembly to rotate around the axis a and the axis b (or the axis c and the axis d) are arranged on the same bearing seat, when the coil is electrified to drive the lens assembly, the up-and-down force and the force rotating around the axis are difficult to avoid crosstalk, in the application, the first bearing seat coil drives the lens to move up and down, the second bearing seat drives the lens assembly to rotate around the axis, the up-and-down force and the force rotating around the axis are separated along with the separation arrangement of the first bearing seat and the second bearing seat, and the crosstalk problem caused by the force generated in the driving process is avoided.

According to one embodiment of the present application, an optical anti-shake function is added on the basis of the optical axis correction and focusing. Specifically, two coils may be added to the second bearing seat 22, and four coils, namely, the fifth coil, the sixth coil, the seventh coil and the eighth coil, are disposed on four sides of the lower side of the second bearing seat. Correspondingly, four magnets are correspondingly arranged on the motor substrate, namely a seventh magnet, an eighth magnet, a ninth magnet and a tenth magnet, wherein the seventh magnet is arranged corresponding to the seventh coil, the eighth magnet is arranged corresponding to the eighth coil, the ninth magnet is arranged corresponding to the fifth coil, the tenth magnet is arranged corresponding to the sixth coil, the four coils and the magnets are overlapped when overlooking along the optical axis direction, at the moment, when the fifth coil is electrified to generate a magnetic field, the ninth magnet is positioned in the magnetic field generated by the fifth coil and is subjected to Lorentz force, and the fifth coil and the ninth magnet are mutually attracted or repelled, so that the fifth coil drives the second bearing seat to move along a plane vertical to the optical axis. Similarly, the sixth, seventh, and eighth coils may also drive the second carrier to move along a plane perpendicular to the optical axis (wherein, when the third, fourth, fifth, and sixth coils of the second carrier are disposed on four sides of the second carrier to correct the tilt of the c-axis or d-axis, the four coils of the second carrier may be matched with the four magnets of the motor housing or the frame to drive the second carrier to rotate along the c-axis or d-axis, or matched with the four magnets on the motor substrate to drive the second carrier to move along the direction perpendicular to the optical axis, that is, the tilted coils and the OIS anti-shake coils may be shared). An axis perpendicular to a plane formed by the four magnets for tilt correction and an axis perpendicular to a plane formed by the four magnets for OIS anti-shake are not parallel.

Preferably, a hall sensor can be further arranged, the hall sensor is arranged on the lower side of the second bearing seat, the hall sensor is arranged in a coil on the lower side of the second bearing seat, at least two hall sensors are arranged on two adjacent coils, the hall sensor and the coil for OIS anti-shake share one group of magnets, and the position to which the second bearing seat actually moves is sensed and fed back.

Fig. 7 is a perspective exploded view of a camera module according to a variation of the present application. Referring to fig. 7, according to an embodiment of the present application, a third carrier 27 is disposed below the second carrier, the third carrier 27 is fixed by a lower spring (not shown in fig. 7), the opposite side magnetite sets up and is used for focusing on first bearing seat 21, the four corners magnetite sets up and is used for correcting the optical axis slope in second bearing seat 22, set up four coils this moment on the four sides that the third bears seat 27, corresponding set up four magnetite on the second bearing seat (wherein when the third, fourth, five, six coils that the above-mentioned second bore the seat, set up in the four sides that the second bore the seat, when correcting the slope of c, d diaxon, the second bears the four coils of seat and can be used for driving the second and bear the seat and move along the optical axis direction, can drive the second again and bear the seat and move in the direction of perpendicular optical axis, just also the coil that adjusts the slope can share with the coil that is used for OIS anti-shake promptly). Or, the third bearing seat is provided with an integral flat coil 28 as an OIS coil, and through the interaction between the magnet of the second bearing seat and the flat coil 28 of the third bearing seat, the coil drives the third bearing seat 27 to move along a plane perpendicular to the optical axis, and the lens module moves along a plane perpendicular to the optical axis, so that the anti-shake effect is achieved.

According to an alternative embodiment of the present application, two piezoelectric sensors are symmetrically disposed on the first bearing seat (in this embodiment, the piezoelectric sensors may be regarded as piezoelectric driving elements), optionally, the two piezoelectric sensors are disposed at opposite corners of the first bearing seat, the piezoelectric sensors are disposed outside the first bearing seat, when an alternating voltage is applied to the piezoelectric sensors, the piezoelectric sensors generate an alternating expansion phenomenon, so that the piezoelectric sensors obtain a driving force to drive the first bearing seat to move up or down along the optical axis, and the lens assembly moves up or down under the action of the piezoelectric sensors, thereby achieving a focusing effect. Furthermore, a second bearing seat is arranged, the first bearing seat and the second bearing seat are arranged in an inner-outer overlapping mode by taking the optical axis as the center, the first bearing seat is located inside the second bearing seat, and the first bearing seat and the second bearing seat can be connected through elastic pieces. The four piezoelectric sensors are symmetrically arranged on the second bearing seat, optionally, the four piezoelectric sensors are arranged at four corners of the second bearing seat, the piezoelectric sensors are fixed at the outer side of the second bearing seat, when the piezoelectric sensors input current, an external alternating voltage is applied to the piezoelectric sensors under a driving source, and an alternating expansion phenomenon is generated, so that the piezoelectric sensors can obtain driving power, and then the first bearing seat is driven by friction force to move upwards or downwards, so that the first bearing seat rotates around a shaft a and a shaft b (connecting lines of the two diagonal piezoelectric sensors are respectively an a shaft and a b shaft).

In another embodiment, the four piezoelectric sensors may also be disposed at the centers of the four sides of the second bearing seat, and at this time, the piezoelectric sensors on the two opposite sides alternately extend and contract under the action of the ac voltage to drive the two opposite sides of the second bearing seat to move upward or downward, so that the second bearing seat rotates around the c axis and the d axis (the connection lines of the piezoelectric sensors on the two opposite sides are the c axis and the d axis, respectively). The second bearing seat is rotated around the shaft through the piezoelectric sensor, so that the lens assembly can also rotate around a shaft a and a shaft b (or a shaft c and a shaft d) for correcting the inclination of the optical axis of the lens.

According to another alternative embodiment of the present application, two SMA (shape memory alloy) wires are disposed on the first bearing seat, optionally, two SMA wires are disposed at opposite corners of the second bearing seat, the top end of the SMA wire is fixed to the upper spring plate, and the tail end of the SMA wire is fixed to the first bearing seat. Similarly, the two SMA wires can be arranged at the center of the opposite sides of the first bearing seat, the top ends of the two SMA wires are fixed on the upper elastic sheet, the tail ends of the two SMA wires are fixed on the first bearing seat, the first bearing seat can be driven to move upwards or downwards along the optical axis, and the lens assembly moves upwards or downwards under the action of the SMA wires, so that the focusing effect is achieved. Furthermore, a second bearing seat is arranged, the first bearing seat and the second bearing seat are arranged in an inner-outer overlapping mode by taking the optical axis as the center, the first bearing seat is located inside the second bearing seat, and the first bearing seat and the second bearing seat are connected through elastic pieces. And when the SMA wires are electrified, the SMA wires deform and are elongated or contracted, the two diagonal SMA wires are elongated or contracted under the action of the current, and the two diagonal SMA wires of the second bearing seat are driven to move upwards or downwards so that the second bearing seat rotates around the axes a and b (the connecting lines of the two diagonal SMA wires are respectively an axis a and an axis b).

In another embodiment, the four SMA wires may also be disposed at the centers of the four sides of the second bearing seat, and at this time, the SMA wires at two opposite sides are elongated or contracted under the action of the current to drive the two opposite sides of the second bearing seat to move up or down, so that the second bearing seat rotates around the c axis and the d axis (the connection line of the SMA wires at two opposite sides is the c axis and the d axis, respectively). The second bearing seat is rotated around the shaft through the SMA wire, so that the lens assembly can also rotate around a shaft a and a shaft b (or a shaft c and a shaft d) for correcting the inclination of the optical axis of the lens.

Further, can set up a third and bear the seat, the third bears the seat, the seat uses the optical axis as the center is born to the first seat that bears and the second, inside and outside stack sets up, the third bears the seat to set up in the second bears the outside of seat, first, second, the third bears the seat and passes through the shell fragment connection, bear the seat at the third and set up four SMA wires, be located the central point of four lateral walls respectively, when the SMA wire lets in the electric current, the SMA wire takes place to warp, the SMA wire elongates or contracts, the drive third bears the seat and moves along perpendicular optical axis direction, drive the camera lens subassembly and move along perpendicular optical axis direction, reach the effect of anti-shake.

Similarly, the four SMA wires can also be arranged at the four corners of the third bearing seat to drive the lens assembly to move along the direction perpendicular to the optical axis, so as to achieve the anti-shake effect.

Wherein, the first bearing seat and the second bearing seat can be interchanged in position.

Further, the present application also proposes an embodiment of a method for correcting an optical axis tilt (i.e. a process flow for correcting an optical axis), which includes the following steps S1-S7.

And step S1, aligning the camera module with the target plate. The target plate has four marks located in the 0.8 field of view, which are located at the four corners of the target plate respectively. Wherein the 0.8 view field is the target view field for evaluating the module imaging quality, and in other embodiments, the target view field may be replaced by another view field other than 0.8.

Step S2, focus: and acquiring a defocusing curve, and searching an image surface center code value corresponding to the resolution force peak value of the four corner identifier of the 0.8 view field.

Specifically, in one embodiment, the position of the target is fixed, the motor drives the lens to move along the optical axis, and the position corresponding to the peak of the resolution force is found within the moving stroke range, and the position can be represented by the code value of the motor. The markers at the four corners of the target, all of which are located on the target field of view (e.g., 0.8 field of view), may be selected as representative targets. Each identifier can find a corresponding resolution peak value and a code value corresponding to the resolution peak value. The four identities correspond to four code values. Each code value represents the offset distance that a motor moves along the optical axis (or z-axis). Due to factors such as manufacturing and assembly tolerances, the four code values corresponding to the four corner markers are often inconsistent (the four code values respectively correspond to the axial positions of the four clear imaging points of the four corner markers, i.e., the axial positions of the imaging points, i.e., the offset of the imaging points in the z-axis direction), that is, the image plane is not perfectly horizontal, but inclined. In this embodiment, the corresponding image plane is fitted according to the four code values, and then the code value of the center point position of the image plane is taken as the center code value corresponding to the resolution peak value. On the other hand, the inclination angle of the image plane can be obtained according to the fitted image plane. And obtaining the inclination angle of the optical axis of the camera module according to the inclination angle of the image plane.

In another embodiment, when the defocus curve is obtained, the reticle may be moved along the optical axis (or z axis), so as to find the resolution peak values and the corresponding axial positions of the image points (i.e., the offset in the z axis direction) corresponding to a plurality of representative target objects in the target field of view, and further obtain the image plane center code values and the image plane tilt angles corresponding to the resolution peak values. And obtaining the inclination angle of the optical axis of the camera module according to the inclination angle of the image plane.

Step S3, calculating current: and calculating the current to be compensated for correcting the inclination angle of the optical axis according to the code value difference (the compensation direction is represented by the positive and negative of the compensated code value). The code (mean of transverse and longitudinal) of a set of diagonal coils is used to calculate the a-axis current; code (horizontal and longitudinal mean value) of another group of diagonal coils is used for calculating b-axis current, and if the code difference value is positive, the value is corrected; otherwise, the negative value is complemented.

In this step, the compensation calculation formula is as follows: tip ═ arcsin (D × B/C);

wherein, B is the slope of the characteristic curve of the closed-loop motor, namely the slope of the code value of the stroke and the center of the motor during focusing, and the unit is mum/code; c is the length of the diagonal line of the imaging area of the chip and the unit of micrometer; d is a code value of the image surface central point position as a central code value corresponding to the resolution force peak value, and the unit is code;

further, converting the tilt value into a compensation value, wherein the compensation value is a current value needing compensation;

compensation value of 1/sensitivity/Imax

Wherein Imax is the maximum value of the motor current and the unit mA; the sensitivity is the sensitivity of the motor in the directions of the axes a and b. Sensitivity is the slope of the open loop current and motor travel in minutes/mA.

Step S4, write compensation current: an operation is input to the register to provide an adjustment current to correct the tilt. The step can comprise the following substeps:

1. closing the hall element (i.e., clearing); 2. selecting an open loop mode, and turning on a Hall element; 3. writing the current value needing to be compensated for the X axis; 4. writing the Y-axis requires a compensated current value.

The specific operation of inputting to the register includes:

1. clearing: 0x48, F015, 2. Wherein 0x48 is I²C address, F015 is a register address, and 2 represents closing the closeloop, i.e., closing the hall element, which is used as the position sensor in the present embodiment.

2. Selecting open loop mode, turning on hall element: 0x48, F010, 3. Wherein 0x48 is I²C address, F010 is register address, 3 represents opening openloop, i.e. selecting open loop mode, opening hall element.

3. Write X-axis current: 0x48, F0, x (I)²C address, register address, write control x-axis current).

4. Write Y-axis Current: 0x48,140, y (I)²C address, register address, write control y-axis current).

After step S4 is completed, the burning of the optical axis correction information is actually completed. In subsequent shooting, the motor can be driven by the burnt optical axis correction information, and then the initial posture of the lens is set, so that the inclination of the optical axis is corrected.

Step S5, hall sensor feedback: the Hall sensor senses the position to which the motor actually moves, the position is compared with a preset optical axis, the difference value is within the range of 5', and the next step is executed; if the difference is greater than 5', the feedback is made to the previous step (i.e., step S2) for re-correction.

In step S6, the control module instructs the motor controller to control the motor to correct the optical axis tilt.

Step S7, AF focusing is performed again: focusing and burning the clearest position.

Further, when the camera module is used for shooting, the second driving element of the motor can drive the motor according to the optical axis correction information burned in the step S4, so as to set the initial posture of the lens, and further correct the inclination of the optical axis. In the present embodiment, the optical axis correction information is a code value of the motor, which represents the initial driving current of the second driving element. After the motor outputs the initial driving current, the optical axis posture of the lens is corrected, the optical axis posture at this time is taken as a reference posture, and the subsequent shooting is performed at the reference posture. It should be noted that the burned optical axis correction information is not limited to the code value of the motor in the present application, for example, in other embodiments of the present application, the burned optical axis correction information may be a current value or other parameters representing the current value.

Further, the present application also proposes another embodiment of the method for correcting an optical axis tilt, comprising the steps of:

step S10, aligning the camera module with the standard plate; the target may have four markers located at 0.8 field of view, each at the four corners of the target. Wherein the 0.8 view field is the target view field for evaluating the module imaging quality, and in other embodiments, the target view field may be replaced by another view field other than 0.8.

In step S20, the hall element is used to sense the positions of the four corner magnets (e.g., the magnets mounted at the four corners of the second carrier), and then the included angle between the diagonal line of the plane where the four corner magnets are located and the standard plane is calculated.

In step S30, a compensation current required to correct the optical axis is calculated. Specifically, a tilt (in this embodiment, the tilt may be understood as an inclination angle) with respect to the standard plane is calculated from an included angle value corresponding to the single code value, and a tilt-code curve is obtained. The tilt-code curve is segmented (for example, the preset value may be, for example, a tilt equal to 1' plus an offset interval, where the offset interval refers to a deviation range from the preset value), code values corresponding to both ends of each segment of the curve are recorded, and for each segment of the tilt-code curve, the tilt value of the segment and a corresponding compensation current are calculated by a least square method or the like (the compensation current may be, for example, characterized by a code value of a motor).

The method of calculating the current to be compensated (the compensation direction is represented by the positive and negative of the compensated code value) may include: the codes of a group of diagonal coils are used for calculating a-axis current; the code of the other group of diagonal coils is used for calculating b-axis current, and if the code difference value is positive, a value is corrected; otherwise, the negative value is complemented.

Compensation calculation formula: tip ═ arcsin (D × B/C);

further, the tilt value is converted into a compensation value, namely a current value needing compensation;

compensation value is tilt 1/sensitivity/Imax;

wherein Imax is the maximum value of the motor current and the unit mA; the sensitivity is the sensitivity of the motor in the directions of the axes a and b. (sensitivity is the slope of the open loop current and motor travel in minutes/mA).

In step S40, a compensation current is written. Specifically, an operation is input to the register, an adjustment current is provided, and tilt is corrected, the steps of: 1. closing the closeloop; 2. opening the openloop; 3. writing the current value needing to be compensated for the X axis; 4. writing the Y-axis requires a compensated current value.

The specific operation of inputting to the register includes:

1. close closeloop: 0x48, F015,2 (each of which represents: I)²C address, register address, close closeloop).

2. Opening the openloop: 0x48, F010,0 (each of which represents: I)²The address of the C, the address of the register,open openloop). 3. Write X-axis current: 0x48, F0, x (I)²C address, register address, write control x-axis current). 4. Write Y-axis Current: 0x48,140, y (I)²C address, register address, write control y-axis current). In this step, for each segment (i.e., each code value interval) of the tilt-code curve, a corresponding compensation value, i.e., a current value to be compensated or a parameter representing the current value, may be written. Step S50, hall sensor feedback: the Hall sensor senses the position to which the motor actually moves, the position is compared with a preset optical axis, the difference value is within the range of 5', and the next step is executed; if the difference is greater than 5', the feedback is made to step S20 for correction.

In step S60, the control module instructs the motor controller to control the motor to correct the optical axis tilt.

Step S70, AF focusing is performed again: focusing and burning the clearest position.

Further, when the camera module is used for shooting, the second driving element of the motor can drive the motor according to the optical axis correction information burned in the step S40, so as to set the initial posture of the lens, and further correct the inclination of the optical axis. In the present embodiment, the optical axis correction information is a code value of the motor, which represents the initial driving current of the second driving element. After the motor outputs the initial driving current, the optical axis posture of the lens is corrected, the optical axis posture at this time is taken as a reference posture, and the subsequent shooting is performed at the reference posture. It should be noted that the burned optical axis correction information is not limited to the code value of the motor in the present application, for example, in other embodiments of the present application, the burned optical axis correction information may be a current value or other parameters representing the current value.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

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

the lens assembly is provided with an optical axis;

the lens assembly is arranged on the first bearing seat;

the second bearing seat is positioned at the outer side of the first bearing seat, and the first bearing seat is elastically connected with the second bearing seat;

the fixing component is positioned on the outer side of the second bearing seat, and the second bearing seat is elastically connected with the fixing component;

the first driving element is arranged between the first bearing seat and the second bearing seat and is suitable for driving the first bearing seat to move along the optical axis direction relative to the second bearing seat; and

and the second driving element is arranged between the second bearing seat and the fixed part and is suitable for driving the second bearing seat to rotate around a radial shaft relative to the fixed part, wherein the second bearing seat is provided with a reference surface which is perpendicular to the optical axis, and the radial shaft is a virtual axis on the reference surface.

2. The camera module of claim 1, wherein the first driving element comprises a coil disposed on an outer side of the first carrier and a magnet disposed on an inner side of the second carrier.

3. The camera module of claim 1, wherein the second driving element comprises a coil disposed on an outer side of the second carrier and a magnet disposed on an inner side of the fixing member.

4. The camera module according to claim 2, wherein the outer side surface of the first bearing seat is provided with a first coil accommodating hole and a second coil accommodating hole which are symmetrical with respect to the optical axis, and the first coil accommodating hole and the second coil accommodating hole are respectively provided with a first coil and a second coil; the medial surface that the second bore the weight of the seat set up with first magnetite holding hole that first coil holding hole corresponds and with the second magnetite holding hole that second coil holding hole corresponds, set up in the first magnetite holding hole can with first coil interact's first magnetite, set up in the second magnetite holding hole can with second coil interact's second magnetite.

5. The camera module according to claim 3, wherein the outer side surface of the second carrier base is provided with a third coil-receiving hole, a fourth coil-receiving hole, a fifth coil-receiving hole, and a sixth coil-receiving hole, the third coil-receiving hole and the fifth coil-receiving hole being symmetrical with respect to the optical axis, the fourth coil-receiving hole and the sixth coil-receiving hole being symmetrical with respect to the optical axis, and wherein each of the third coil-receiving hole, the fourth coil-receiving hole, the fifth coil-receiving hole, and the sixth coil-receiving hole is provided with a third coil, a fourth coil, a fifth coil, and a sixth coil, respectively; the inner side surface of the fixing part is provided with a third magnet containing hole corresponding to the third coil containing hole, a fourth magnet containing hole corresponding to the fourth coil containing hole, a fifth magnet containing hole corresponding to the fifth magnet containing hole and a sixth magnet containing hole corresponding to the sixth coil containing hole, a third magnet capable of interacting with the third coil is arranged in the third magnet containing hole, a fourth magnet capable of interacting with the fourth coil is arranged in the fourth magnet containing hole, a fifth magnet capable of interacting with the fifth coil is arranged in the fifth magnet containing hole, and a sixth magnet capable of interacting with the sixth coil is arranged in the sixth magnet containing hole.

6. The camera module of claim 5, wherein the second holder has a substantially rectangular shape in plan view, and the third coil, the fourth coil, the fifth coil and the sixth coil are located outside four corners of the second holder, respectively.

7. The camera module of claim 5, wherein the second holder has a substantially rectangular shape in plan view, and the third coil, the fourth coil, the fifth coil and the sixth coil are respectively located outside four sides of the second holder.

8. The camera module according to claim 1, wherein the first carrier and/or the second carrier is further provided with a displacement sensor.

9. The camera module according to claim 1, wherein the first carrying seat and the second carrying seat are connected to each other and the second carrying seat and the fixing member are connected to each other by an integral spring, the spring includes a first elastic section connecting the first carrying seat and the second carrying seat and a second elastic section connecting the second carrying seat and the fixing member, and the first elastic section and the second elastic section are joined by an elastic inflection point provided on the second carrying seat.

10. The camera module according to claim 1, wherein the first bearing seat is connected to the second bearing seat via a first resilient piece, and the second bearing seat is connected to the fixing member via a second resilient piece.

11. The camera module according to claim 3, wherein the second carriage has a magnetic shield disposed between the magnet on an inner side thereof and the coil on an outer side thereof.

12. The camera module according to claim 3, further comprising a third supporting base disposed below the second supporting base and elastically connected to the fixing member, wherein a third driving element is disposed between the third supporting base and the second supporting base and adapted to drive the third supporting base to move along a direction perpendicular to the optical axis.

13. The camera module of claim 12, wherein the third driving element comprises four coils disposed on the third carrier and four magnets disposed on the second carrier.

14. The camera module according to claim 1, wherein the fixing member comprises a base, a motor housing, and a frame located inside the motor housing, and the second driving element is disposed between the second carriage and the frame.

15. The camera module of claim 1, wherein the fixing member comprises a base and a motor housing, and the second driving element is disposed between the second bearing seat and the motor housing.

16. The camera module of claim 1, wherein the first drive element and/or the second drive element is a piezoelectric drive element.

17. A camera module according to claim 1, characterized in that the first and/or second drive element is an SMA drive element.

18. A method of correcting optical axis tilt for a camera module, the camera module comprising:

the lens assembly is provided with an optical axis;

the lens assembly is arranged on the first bearing seat;

the second bearing seat is elastically connected with the first bearing seat;

the second driving element is arranged between the second bearing seat and the fixed part and is suitable for driving the second bearing seat to rotate around a radial shaft relative to the fixed part, wherein the second bearing seat is provided with a reference surface perpendicular to the optical axis, and the radial shaft is a virtual axis on the reference surface;

the method of correcting the optical axis tilt includes:

1) after the camera module is assembled, measuring the inclination angle of the optical axis of the camera module;

2) a control module for calculating a current value to be input to the second drive element for correcting the inclination angle of the optical axis and writing the current value or a parameter representing the current value into the second drive element; and

19. The method of correcting an optical axis tilt according to claim 18, wherein the subsequent photographing includes a focusing or/and an anti-shake operation.

20. The method of correcting an optical axis tilt according to claim 18, wherein the step 1) further comprises: setting a target plate, wherein the target plate is provided with a plurality of marks positioned in a target view field; measuring the axial position of an imaging point corresponding to the resolution force peak value of each mark; then obtaining an image plane inclination angle according to the measured axial position of the imaging point of each mark, and further obtaining an inclination angle of the optical axis of the camera module;

the step 2) further comprises the following steps: and burning the current value or the parameter representing the current value into a register of the second driving element.

21. The method of correcting an optical axis tilt according to claim 18, wherein the step 2) includes the sub-steps of:

21) calculating the current to be compensated according to the difference of the motor code values of the imaging points corresponding to the marks;

22) writing a compensation current to a register of the second drive element; and

23) sensing the actual movement of the lens assembly under the action of the compensation current by using a displacement sensor, calculating the inclination angle of the central axis of the lens assembly relative to a preset ideal optical axis, and finishing the step 2) when the inclination angle between the central axis of the lens assembly and the preset ideal optical axis is within a preset threshold value; otherwise, returning to the step 1) to recalculate the inclination angle of the optical axis.

22. The method of correcting an optical axis tilt according to claim 21, wherein the step 2) further comprises:

24) and after the compensation current is written in to correct the inclination angle of the optical axis, focusing is carried out again, and the clearest position is burnt.

23. The method of correcting an optical axis tilt according to claim 18, wherein the step 1) includes: and moving the camera module in the axial direction, sensing the movement of four magnets positioned on the diagonal line of the second bearing seat by using a Hall element, and then calculating the included angle between the diagonal line of the second bearing seat and the horizontal plane.

24. The method of correcting an optical axis tilt according to claim 23, wherein the step 2) includes:

21) calculating the inclination angle of the second bearing seat relative to the horizontal plane according to the included angle between the diagonal line of the second bearing seat corresponding to the single code value of the driving motor and the horizontal plane to obtain an inclination angle-code curve; the inclination angle-code curve is processed in a segmented mode, a code value interval corresponding to each section of curve is recorded, and compensation current for compensating the inclination angle in the code value interval is calculated;

22) then writing the compensation current and the corresponding code value interval into a register of the second driving element; and

25. The method of correcting an optical axis tilt according to claim 24, wherein the step 2) further comprises:

24) after the compensation current is written in, focusing is carried out again, and the clearest position is burnt;

the step 3) further comprises the following steps: when the camera module is used for shooting, acquiring a current actual code value, and searching a corresponding written current value or a parameter representing the current value according to a section of an inclination angle-code curve where the current actual code value is located; and the second driving element outputs initial driving current according to the search result, takes the optical axis posture at the moment as a reference posture, and performs subsequent shooting according to the reference posture.

26. A method for correcting the tilt of the optical axis of a camera module according to any one of claims 1-17, comprising the steps of: