CN116349235A

CN116349235A - Optical anti-shake camera module

Info

Publication number: CN116349235A
Application number: CN202180069891.4A
Authority: CN
Inventors: 魏罕钢; 卞强龙; 刘佳; 袁栋立
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2020-11-06
Filing date: 2021-10-26
Publication date: 2023-06-27
Also published as: CN114449158A; CN114449158B; CN114449159A; WO2022095751A1

Abstract

The application relates to an optics anti-shake module of making a video recording, it includes: a lens; a photosensitive assembly; a first driving part adapted to mount the lens and drive the lens to translate in x-axis and y-axis directions; the second driving part is suitable for driving the photosensitive chip to translate in the directions of the x axis and the y axis, and comprises a second base part and a second movable part, wherein the second base part comprises a base and a cover, at least one part of the base is positioned below the photosensitive assembly, the bottom of the cover is connected with the base, and the top of the cover is connected with the first driving part; the second movable part is movably connected with the second base part through a ball, and the freedom of movement is limited in an xoy plane through the ball; wherein, the lens and the photosensitive chip are configured to be driven simultaneously and move towards opposite directions; the ball is positioned outside the outer side surface of the photosensitive assembly. The anti-shake stroke and the anti-shake response speed of the camera module can be improved, and the camera module can be reduced in height.

Description

Optical anti-shake camera module

RELATED APPLICATIONS

The present application claims priority from chinese patent application No. 202011231140.1, entitled "optical anti-shake camera module", filed 11/6/2020, the entire contents of which are incorporated herein by reference.

Technical Field

The invention relates to the technical field of camera equipment, in particular to an optical anti-shake camera module.

Background

With the increasing demands of consumers for mobile phones, the functions of mobile phone cameras (i.e. camera modules) are becoming more and more abundant, and the functions of portrait shooting, remote shooting, optical zooming, optical anti-shake and the like are integrated into cameras with limited volumes, and the functions of auto focusing, optical anti-shake, optical zooming and the like are often realized by means of optical actuators (sometimes also called motors).

Fig. 1 shows a typical prior art camera module with a motor. Referring to fig. 1, the image pickup module generally includes a lens 1, a motor mechanism 2 (which may be simply referred to as a motor), and a photosensitive assembly 3. In the photographing state, the light from the photographing object is focused on the photosensitive element 3a of the photosensitive assembly 3 through the lens 1. Structurally, the lens 1 is fixed to a motor carrier (specifically shown in fig. 1) of a motor, which is a movable member that normally moves the lens 1 in the optical axis direction by a driving element of the motor to realize a focusing function. For an image capturing module with an optical anti-shake (OIS) function, the motor often has a more complex structure. This is because the motor is required to drive the lens 1 to move in other degrees of freedom (for example, in a direction perpendicular to the optical axis) in addition to the lens to be driven in the optical axis direction to compensate for shake at the time of photographing. In general, the shake of the camera module includes translation (translation in x-axis and y-axis directions) and rotation (rotation in the xoy plane, whose rotation axis direction may be substantially the same as the optical axis) in a direction perpendicular to the optical axis, and tilt shake (rotation about x-axis and y-axis, which is also referred to as tilt shake in the field of camera modules). When the gyroscope (or other position sensing element) in the module detects shake in one direction, a command can be sent to enable the motor to drive the lens to move a distance in the opposite direction, so that shake of the lens is compensated. Typically, the lens is only translated and/or rotated in a direction perpendicular to the optical axis to compensate for the shake of the camera module, because if the lens is rotated around the x and y axes, i.e. if the anti-shake effect is achieved by tilt adjustment of the lens, the imaging quality of the module may be degraded, or even a paste may be generated, which makes it difficult to meet the basic imaging quality requirements.

However, as the imaging quality requirement of the camera module of the mobile phone is higher, the volume and weight of the lens are larger and larger, and the driving force requirement of the motor is also higher and higher. The volume of the camera module is also greatly limited by the current electronic equipment (such as a mobile phone), and the occupied volume of the motor is correspondingly increased along with the increase of the lens. In other words, in the trend of the lens toward larger volume and weight, the driving force provided by the motor is difficult to increase correspondingly. On the premise of limited driving force, the heavier the lens, the shorter the stroke of the motor capable of driving the lens to move, and the anti-shake capability is affected. On the other hand, the heavier the lens, the slower the motor can drive the lens to move, and the longer the lens reaches a predetermined compensation position, which also affects the anti-shake effect.

Therefore, a solution capable of improving the anti-shake stroke and the anti-shake response speed of the camera module is urgently needed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a solution capable of improving the anti-shake stroke and the anti-shake response speed of an image pickup module.

In order to solve the above technical problems, the present invention provides an optical anti-shake camera module, which includes: a lens; a photosensitive assembly having a photosensitive chip; a first driving part adapted to mount the lens and drive the lens to translate in x-axis and y-axis directions; and a second driving part adapted to drive the photosensitive chip to translate in the x-axis and y-axis directions, the second driving part comprising a second base part and a second movable part, the second base part comprising a base and a cover, at least a part of the base being located below the photosensitive assembly, the bottom of the cover being connected to the base, the top of the cover being connected to the first driving part; the second movable part is movably connected with the second base part through a ball, and the freedom of movement is limited in an xoy plane through the ball; wherein the lens and the photosensitive chip are configured to be driven simultaneously and move in opposite directions; the balls are positioned on the outer side of the outer side face of the photosensitive assembly.

The second driving part is also used for driving the photosensitive chip to rotate on the xoy plane.

Determining a lens moving distance b for driving the lens to move by the first driving module and a photosensitive chip moving distance c for driving the photosensitive chip to move by the second driving module according to the detected inclined shaking angle a of the camera module; the lens moving distance b, the photosensitive chip moving distance c and the image space focal length f of the camera module satisfy the following conditions: a=arctan (b/f) +arctan (c/f).

The driving structure further comprises a driving logic module, wherein the driving logic module is used for keeping the ratio of the lens moving distance b to the photosensitive chip moving distance c at a preset fixed ratio.

The driving structure further comprises a driving logic module, which is provided with an anti-shake threshold K, wherein the driving logic module is used for keeping the ratio of the lens moving distance b to the photosensitive chip moving distance c at a preset fixed ratio when the inclined shake angle a is smaller than or equal to the anti-shake threshold K, and enabling the photosensitive chip moving distance c to reach the maximum value c of the moving stroke when the inclined shake angle a is larger than the anti-shake threshold K _max The lens movement distance b is according to the relation b=tan (a/f) -c _max And (5) calculating to obtain the product.

The preset fixed proportion of the lens moving distance and the photosensitive chip moving distance is set according to the weight of the lens, the driving force of the first driving part, the weight of the photosensitive chip or the photosensitive assembly and the driving force of the second driving part, so that the time for the lens and the photosensitive chip to move to respective anti-shake target positions is consistent.

Wherein the first driving part includes a first base part and a first movable part; the top of the cover is fixed with the first base part, the second movable part is positioned above the base and is movably connected with the second base part, and the photosensitive assembly is fixed on the upper surface of the second movable part; the second movable part is movably connected with the second base part through the ball, wherein the upper surface of the second base part, the ball and the lower surface of the second movable part are sequentially supported in the z-axis direction, so that the movement freedom degree of the second movable part relative to the second base part is limited within an xoy plane, and the z-axis is perpendicular to the xoy plane.

Wherein the balls are arranged in four corner regions of the second driving part in a plan view.

Wherein the second base part is provided with at least three grooves, and at least three balls are arranged in the at least three grooves to bear the second movable part on the xoy plane.

Wherein the second movable portion includes a movable portion bottom plate and a movable portion side wall formed to extend upward from an edge region of the movable portion bottom plate; the photosensitive assembly is arranged in a containing groove formed by the movable part bottom plate and the movable part side wall; glue is arranged between the inner side surface of the side wall of the movable part and the outer side surface of the photosensitive assembly so as to fix the second movable part and the photosensitive assembly together.

Wherein the cover comprises a cover side wall and a bearing platform formed by extending inwards from the top of the cover side wall; the second movable part further comprises an epitaxial structure formed by extending outwards from the side wall of the movable part; the susceptor comprises a substrate and a susceptor side wall formed by extending upwards from the edge area of the substrate, the substrate is positioned below the photosensitive assembly, the top surface of the susceptor side wall is provided with a first groove, the balls are positioned in the first groove, and the lower surface of the epitaxial structure is supported by the balls.

Wherein the lid sidewall and the base sidewall are joined to form a complete base sidewall.

Wherein the epitaxial structure is formed by extending outwards from the top of the side wall of the movable part.

And a fourth gap is arranged between the lower surface of the bearing table and the upper surface of the epitaxial structure, and the fourth gap is smaller than 10 mu m.

Wherein the balls comprise a first ball and a second ball; the first balls are located in the first grooves, the extension structure is formed by extending outwards from the middle of the side wall of the movable part, the upper surface of the extension structure is provided with a second groove, the second balls are located in the second grooves, and the lower surface of the bearing table is supported by the second balls.

The base comprises a substrate, and the driving element of the second driving part is a coil magnet combination; wherein the magnet is arranged at the edge area of the substrate, and the coil is arranged at the edge area of the movable part bottom plate; or the coil and the magnet are respectively arranged on the side walls of the second movable part and the second base part.

The coil magnet combination comprises a first coil magnet pair, a second coil magnet pair and a third coil magnet pair; wherein the first coil magnet pair and the second coil magnet pair are used for providing driving force in the x-axis direction; the third coil magnet pair is used for providing driving force in the y-axis direction; and the first coil magnet pair and the second coil magnet pair may be arranged along a first side and a second side of the second driving part, respectively, the first side and the second side being disjoint, and the second coil magnet pair being arranged along a third side of the second driving part, the third side being intersected by both the first side and the second side, in a plan view.

Wherein a fifth gap is provided between the movable portion side wall and the base side wall, the fifth gap being greater than 200 μm.

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

1. the anti-shake stroke of the camera module can be improved, so that larger shake of the camera module can be compensated.

2. The anti-shake response speed of the camera module can be improved.

3. The optical anti-shake camera module has the advantage of compact structure, and is particularly suitable for miniaturized camera modules.

4. In some embodiments of the present application, the setting may be performed according to factors such as the weight of the lens, the driving force of the first driving portion, the weight of the photosensitive chip (or photosensitive component), and the driving force of the second driving portion, so that the time for the lens and the photosensitive chip to move to the respective anti-shake target positions is substantially consistent, thereby obtaining a better anti-shake effect.

5. In some embodiments of the present application, the second driving portion does not need to provide a light-transmitting hole, so that the thickness of the base portion or/and the movable portion of the second driving portion can be reduced, thereby helping to reduce the height of the camera module.

6. In some embodiments of the present application, the movable portion and the base portion of the second driving portion are movably connected through a ball, and movement is limited on an xoy plane, and the ball is disposed on the outer side of the photosensitive assembly (the outer side of the photosensitive assembly is referred to as the outer side), so that space in the height direction of the camera module is prevented from being occupied, and the height of the camera module is reduced.

7. In some embodiments of the present application, the movable portion of the second driving portion and the base of the base portion are disposed below the circuit board of the photosensitive assembly, so as to avoid a problem of image stain caused by leakage of the adhesive material (a problem of stain on a shot image caused by contaminant infiltration in an imaging optical path).

Drawings

FIG. 1 illustrates a typical prior art camera module with a motor;

FIG. 2 is a schematic cross-sectional view of an image capturing module with anti-shake features according to an embodiment of the present disclosure;

fig. 3 is a schematic cross-sectional view of a comparative example of an imaging module with anti-shake function according to another embodiment of the present application;

FIG. 4 is a schematic diagram showing the relationship between the moving distance of the lens and the photosensitive chip and the inclination angle of the module under four different conditions in the application;

FIG. 5 illustrates a schematic cross-sectional view of a camera module in one embodiment of the present application;

fig. 6a shows a schematic perspective view of a second drive part in an embodiment of the present application;

FIG. 6b illustrates an exploded perspective view of a second drive section in one embodiment of the present application;

FIG. 7 illustrates a schematic cross-sectional view of an imaging module according to one embodiment of the present application;

FIG. 8a shows a ball configuration of a second drive section in a modified embodiment of the present application;

FIG. 8b shows a schematic view of the movable part rotating in the xoy plane;

FIG. 9 illustrates a schematic diagram of one exemplary assembly of a second drive section in one embodiment of the present application;

fig. 10 is a schematic view showing an exploded state before assembly of the second driving part in another embodiment of the present application;

fig. 11 is a schematic view showing an intermediate state in the assembly process of the second driving part in another embodiment of the present application;

FIG. 12 illustrates an installation position of a drive element of a second drive section in an embodiment of the present application in a top view;

FIG. 13a shows a schematic cross-sectional view of a second drive section including a drive element in one embodiment of the present application;

FIG. 13b shows a schematic cross-sectional view of a second drive section including a drive element in another embodiment of the present application;

FIG. 14 is a schematic diagram illustrating an assembly of a camera module in one embodiment of the present application;

FIG. 15a illustrates an arrangement of camera modules and their connection straps in one embodiment of the present application;

fig. 15b shows a schematic perspective view of a second drive part in an embodiment of the present application;

FIG. 16 is a schematic view showing the connection of the photosensitive assembly to the second movable portion in another embodiment of the present application;

FIG. 17 is a schematic cross-sectional view of an imaging module according to another embodiment of the present application;

fig. 18 shows a schematic cross-sectional view of an imaging module according to another 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 these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the 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 in this specification, the expressions first, second, etc. are only used to distinguish one feature from another feature, and do not represent any limitation of the feature. 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 the object have been slightly exaggerated for convenience of explanation. The figures are merely examples and are not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, the use of "may" means "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 a table approximation, not as terms of a table level, and are intended to illustrate inherent deviations in measured or calculated values that would be recognized by one 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, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

The invention is further described below with reference to the drawings and specific embodiments.

Fig. 2 is a schematic cross-sectional view of an image capturing module with anti-shake function according to an embodiment of the present application. Referring to fig. 2, in the present embodiment, the image capturing module includes a lens 10, a photosensitive assembly 20, a first driving portion 30, and a second driving portion 40. Wherein the photosensitive assembly 20 includes a photosensitive chip 21. The first driving part 30 is configured to drive the lens 10 to move in both x and y directions, and the second driving part 40 is configured to drive the photosensitive chip 21 to move in both x and y directions. In this embodiment, the x and y directions are perpendicular to each other and are parallel to the photosensitive surface of the photosensitive element 20. The z direction is parallel to the normal direction of the photosensitive surface. For ease of understanding, a three-dimensional rectangular coordinate system constructed based on the x, y, z directions is also shown in fig. 2. In this embodiment, the control module drives the lens 10 and the photosensitive chip 21 to move in opposite directions at the same time, so as to realize optical anti-shake of the image capturing module. Specifically, the lens 1 and the photosensitive chip 21 are configured to be driven simultaneously and move in opposite directions, for example, the lens 10 is driven to move in the positive x-axis direction, and the photosensitive chip 21 is driven to move in the negative x-axis direction; the lens 10 is driven to move toward the positive y-axis direction, and the photosensitive chip 21 is driven to move toward the negative y-axis direction; or the lens 10 is driven to move in the x-axis and the y-axis while the photosensitive chip 21 is driven to move in the x-axis and the y-axis in the opposite direction to the movement of the lens 10, in other words, when the movement in the x-axis and the y-axis is required to be simultaneously performed, the direction of the displacement vector of the lens 10 and the direction of the displacement vector of the photosensitive chip 21 are opposite in the xoy plane. The camera module generally includes a position sensor for detecting shake of the camera module or a terminal device (i.e., an electronic device, such as a mobile phone, on which the camera module is mounted). When the shake is detected, the position sensor sends a signal to the image pickup module, and the lens 10 and the photosensitive chip 21 are driven to move correspondingly to compensate the shake, so that the purpose of optical shake prevention is achieved. In this embodiment, the lens 10 and the photosensitive chip 21 are configured to move simultaneously, and the movement directions of the lens 10 and the photosensitive chip 21 are opposite, so that a faster response can be achieved, and a better anti-shake effect is achieved. In addition, the anti-shake angle range of the camera module is limited by the suspension system and the driving system, and a relatively large compensation angle range cannot be achieved. In addition, in the present embodiment, by driving the lens 10 or the photosensitive chip 21 to move in opposite directions at the same time, a larger relative movement stroke (for convenience of description, the relative movement stroke may be simply referred to as an anti-shake stroke) is provided between the lens 10 and the photosensitive chip 21 than in the case of driving only the lens 10. In particular, due to the increase of the anti-shake stroke, the embodiment also has a better compensation effect on the tilting shake of the camera module. Further, the moving direction of the anti-shake movement of the present embodiment may be defined in the xoy plane, and the optical axis of the lens 10 or the photosensitive chip 21 does not need to be tilted, so that the problem of image sticking caused by the anti-shake movement is avoided.

Further, in another embodiment of the present application, the photosensitive chip 21 may be further driven by the second driving part 40 to rotate in the xoy plane, so as to implement compensation for shake in the rotation direction of the camera module.

Further, still referring to fig. 2, in one embodiment of the present application, the image capturing module includes a first driving section 30, a lens 10, a second driving section 40, and a photosensitive assembly 20. The lens 10 is mounted on the first driving unit 30. The first driving part 30 may have a cylindrical first motor carrier, which may be a movable part of the first driving part, and the lens is mounted on an inner side surface of the first motor carrier. The first driving part also has a stationary part, or called base part. In this embodiment, the base portion may be implemented as a motor housing. The motor housing may include a base and a cover. The base is provided with a light-passing hole. The movable part is movably connected with the base part. The driving element may be a coil magnet combination, which may be mounted between the movable part and the base part. For example, may be mounted between the first motor carrier and the motor housing. In fact, the first driving part in the present embodiment may directly adopt a common structure of the optical anti-shake motor in the prior art. Further, in the present embodiment, the second driving portion 40 may also include a base portion and a movable portion. Wherein the base part may include a base plate and a base part sidewall, a bottom of the base part sidewall is connected with the base plate, and a top of the base part sidewall is connected with the base part of the first driving part. For convenience of description, the base portion of the first driving portion 30 is sometimes referred to herein as a first base portion, the base portion of the second driving portion 40 is referred to as a second base portion, the movable portion of the first driving portion 30 is referred to as a first movable portion, and the movable portion of the second driving portion 40 is referred to as a second movable portion. In this embodiment, the second movable portion is located above the substrate of the second base portion, and is movably connected with the second base portion through a ball structure. The photosensitive assembly 20 comprises a circuit board 23, a photosensitive chip 21 mounted on the surface of the circuit board, and a lens base 22 surrounding the photosensitive chip 21. The bottom of the lens base 22 may be mounted on the surface of the circuit board 23. The center of the lens base 22 has a light-transmitting hole, and a light filter 24 is mounted on the lens base 22 (the light filter 24 can also be regarded as a component of the photosensitive assembly 20). The bottom surface of the wiring board may be fixed (e.g., adhered) to the upper surface of the second movable portion. Thus, the photosensitive assembly 20 can translate in the x and y directions or rotate in the xoy plane relative to the base portion under the driving of the second movable portion. On the other hand, in this embodiment, since the second movable portion may be disposed on the back surface of the circuit board, the second movable portion and the base of the second base portion may not be provided with the light-transmitting hole, so that the second movable portion may be designed to be thinner and lighter under the condition of the same structural strength, which is beneficial to miniaturization of the camera module. For ease of understanding, the following description is given in connection with one comparative example.

Fig. 3 is a schematic cross-sectional view of a comparative example of an imaging module with anti-shake function according to another embodiment of the present application. In this comparative example, the image pickup module includes a first driving part 30, a lens 10, a second driving part 40, and a photosensitive assembly 20. The lens 10 is mounted on the first driving unit 30. The structure and assembly of the first driving part 30 and the lens 10 may be identical to those of the previous embodiment shown in fig. 2, and will not be described again. This comparative example differs from the previous example in that: the second driving part 40 is located between the lens 10 and the photosensitive assembly 20. The second base portion 41 may be directly fixed to the bottom surface of the first base portion, and the second movable portion 42 is located below the second base portion 41 and movably connected to the second base portion 41, so that the second movable portion 42 may move on the xoy plane relative to the second base portion 41. The photosensitive member 20 is mounted below the second movable portion 42. The top surface of the lens base 22 of the photosensitive assembly 20 is fixedly connected with the bottom surface of the second movable portion 42, so that the photosensitive assembly 20 can translate in the x and y directions or rotate in the xoy plane relative to the second base portion 41 under the driving of the second movable portion 42. The circuit board 23 of the photosensitive assembly 20 may rest on the main board 90 of an electronic device (e.g., a mobile phone). The filter 24 may be mounted to the lens mount 22. In this comparative example, since the second base portion 41 and the second movable portion 42 are both located on the imaging optical path, the second base portion 41 and the second movable portion 42 each need to be provided with a light passing hole in the center so that light passes therethrough. Thus, in order to maintain the required structural strength, the thickness of the second base portion 41 and the second movable portion tends to increase, possibly resulting in an increase in the height of the image pickup module. In the embodiment based on fig. 2, the base of the second base portion 41 and the second movable portion 42 are disposed on the back surface of the circuit board of the photosensitive assembly 20, so that the thicknesses of the base of the second base portion 41 and the second movable portion 42 can be reduced on the premise of the same structural strength, thereby helping to reduce the height of the camera module and to miniaturize the camera module.

In fig. 2, the second movable portion 42 has a flat plate shape, and the bottom surface of the circuit board 23 of the photosensitive assembly 20 may be bonded to the upper surface of the second movable portion 42. But this design is not the only solution for the present application. For example, fig. 16 shows a schematic connection diagram of the photosensitive assembly and the second movable portion in another embodiment of the present application. Referring to fig. 16, in this embodiment, the second movable portion 42 may include a movable portion bottom plate 42a and a movable portion side wall 42b, the movable portion side wall 42b being formed to extend upward from an edge region of the movable portion bottom plate 42 a. The photosensitive member 20 may be placed in a receiving groove formed by the movable portion bottom plate 42a and the movable portion side wall 42 b. Glue 91 may be arranged between the inner side of the movable part side wall 42b and the outer side of the photosensitive assembly 20, i.e. in this embodiment the second movable part 42 and the photosensitive assembly 20 are fixed together by arranging glue at the sides.

The following describes a method for compensating the tilt shake of the camera module based on the design thought of the application in further detail with reference to the embodiments.

Fig. 4 is a schematic diagram showing the relationship between the moving distance of the lens and the photosensitive chip and the inclination angle of the module under four different conditions in the application. In the figure, the position A represents the combination of the moving distance of the lens and the photosensitive chip for compensating the shake angle a of the camera module. As shown in fig. 4, the lens moving distance is b, the moving distance of the photosensitive chip (hereinafter sometimes simply referred to as chip) is c, and the lens or chip moving distance can be equivalent to the angle of the image plane deviating from the optical axis at the time of optical imaging. Specifically, when the translational distance of the lens in the xoy plane is b, an arithmetic relationship is formed between the image plane offset angle α1 and the image distance, the image distance is different at different shooting distances, and the image distance is replaced by the focal length of the image side for the convenience of calculation and expression. Specifically, the relationship between the image plane offset angle α1 and the focal length f of the lens is: tan (α1) =b/f, when the translation distance of the photosensitive chip in the xoy plane is c, the relationship between the image plane offset angle α2 and the focal length f of the lens image space is: tan (α2) =c/f. In this embodiment, the moving directions of the lens and the photosensitive chip are opposite, so the calculation mode of the comprehensive compensation angle a of the camera module is as follows: a=α1+α2=arctan (b/f) +arctan (c/f). In one embodiment, the moving distance of the lens and the photosensitive chip may be set to be the same, i.e., b=c. In another embodiment, the distance the lens moves from the photosensitive chip may be set to be unequal, for example, the distance the lens moves may be greater than the distance the photosensitive chip moves, i.e., b > c. In this embodiment, the second driving portion may select a smaller-sized driver (such as a mems driver, etc., and the movable stroke of such a driver is also relatively small), so as to help the overall miniaturization of the camera module.

Further, in one embodiment of the present application, the ratio of the lens moving distance to the photosensitive chip moving distance is optionally set to keep a fixed ratio, for example, b/c=6:4, b/c=7:3, or b/c=5:5, and the distance between the lens and the photosensitive chip moving is kept at the preset ratio no matter what the compensation value (for example, the integrated compensation angle a) of the shake of the camera module is, which is beneficial to making the compensation effect of the camera module uniform in the compensable range and reducing the design difficulty of the driving logic module of the anti-shake system of the camera module.

Further, in the configuration in which the lens movement distance and the photosensitive chip movement distance are subjected to anti-shake movement based on a fixed ratio, since the movable range of the photosensitive chip is small, sometimes the shake of the image pickup module may exceed the maximum movement stroke of the photosensitive chip. Therefore, in an embodiment of the present application, an anti-shake threshold may be set, for example, for a shake angle a to be compensated, a threshold K may be set, and when the shake angle a actually calculated is less than or equal to the anti-shake threshold K, the lens moving distance b and the photosensitive chip moving distance c are kept at a fixed ratio, where the fixed ratio may be preset, for example, b/c=6:4, b/c=7:3, or b/c=5:5. When the actually calculated shake angle a is greater than the anti-shake threshold K, the moving distance c of the photosensitive chip takes the maximum value of the moving travel, namely the maximum travel c of the photosensitive chip _max And lens shift distance b=tan (a/f) -c _max . In other words, when the shake angle to be compensated by the camera module is above the anti-shake threshold K, the lens is moved to a maximum value corresponding to the moving distance of the photosensitive chip (i.e. the maximum stroke c of the photosensitive chip _max ) After the position of (2), the first driving part can drive the lens to move continuously until the lens moving distance b=tan (a/f) -c _max . At the same time, the photosensitive chip moves synchronously to the maximum value c of the moving distance of the photosensitive chip _max And then remain stationary.

Further, in another embodiment of the present application, in the xoy plane, the maximum travel b of the lens movement _max The corresponding anti-shake angle (the anti-shake angle refers to the angle of inclined shake of the camera module) can be smaller than the most sensitive chipLarge travel c _max The corresponding anti-shake angle. Under the design, the anti-shake system of the camera module can have a faster response speed. In high-end lenses, the lenses often have a large number of lenses, for example, the number of lenses in the rear-end main camera lens in the current smart phone can reach 8 lenses, and in order to further improve imaging quality, glass lenses are used in some lenses, which all result in a large lens weight. When the driving force is not significantly increased, the speed at which the driving device drives the lens to move will decrease. The weight of the photosensitive chip or the photosensitive component is relatively light, and the preset position can be reached by a small driving force. Therefore, in the scheme of the embodiment, the advantage that the photosensitive chip or the photosensitive assembly is relatively close in weight and relatively fast in moving speed can be better utilized, and the response speed of the anti-shake system of the camera module is effectively improved.

Further, in another embodiment of the present application, the fixed ratio of the lens movement distance to the photosensitive chip movement distance may be set according to factors such as the weight of the lens, the driving force of the first driving portion, the weight of the photosensitive chip (or the photosensitive assembly), the driving force of the second driving portion, and the like, and the setting of a suitable fixed ratio may enable the time for the lens and the photosensitive chip to move to respective anti-shake target positions to be substantially consistent, so as to obtain a better anti-shake effect. Specifically, the weight of the lens and the driving force of the first driving part may substantially determine the moving speed of the lens, and the weight of the photosensitive chip (or the photosensitive assembly) and the driving force of the second driving part may substantially determine the moving speed of the photosensitive chip, when the moving speed of the lens is smaller than the moving speed of the photosensitive chip (for example, in the case of a large weight of the lens), the moving distance of the photosensitive chip may occupy a large proportion when the fixed proportion is set, so that the characteristic of the moving speed of the photosensitive chip is utilized, so that the photosensitive chip moves a longer distance, and the time for the lens and the photosensitive chip to move to respective anti-shake target positions is substantially consistent.

Further, in another embodiment of the present application, the first driving part may employ a driving element having a large driving force, and a suspension system having a large stroke. For example, the first driving portion may be driven by an SMA (shape memory alloy) element. Compared with the traditional coil magnet combination, the SMA element can provide larger driving force with smaller occupied space, so that the first driving part can be designed more compactly, and the miniaturization of the camera module is facilitated.

Further, fig. 5 shows a schematic cross-sectional view of an image capturing module in an embodiment of the present application. Referring to fig. 5, in the present embodiment, the second base portion 41 of the second driving portion 40 is fixed with the first base portion (which may be formed by the housing 33 and the first base 34 together) of the first driving portion 30. The lens 10 may be mounted to a first movable portion of the first driving portion 30 (for example, a first motor carrier 31 that may be mounted to the first movable portion). The photosensitive assembly 20 includes a circuit board 23, a photosensitive chip 21, a lens base 22, an optical filter 24, and the like. The photosensitive assembly 20 may be mounted to the second movable portion 42 of the second driving portion 40. Specifically, the bottom surface of the moving portion 42 may bear against the top surface of the lens holder 22 of the photosensitive assembly 20. In the second driving portion 40, the second base portion 41 and the second movable portion 42 may be elastically connected by a suspension system. In this embodiment, the suspension system allows the second movable portion 42 to translate in the xoy plane with respect to the second base portion 41. Alternatively, the suspension system may be a ball system, which has the advantage that: in the z direction, the second movable portion 42 and the second base portion 41 are brought into contact by balls, the second movable portion 42 moves only in the xoy plane, and movement in the optical axis direction (i.e., the z axis direction) can be prevented by the balls between the second movable portion 42 and the second base portion 41, thereby avoiding an influence on focusing of the camera module.

Alternatively, in another embodiment, the suspension system may comprise a resilient element (e.g. a spring) by which the fixed and movable parts are connected, which allows translation of the movable part relative to the base part in the xoy plane but prevents movement of the movable part relative to the base part outside the xoy plane. The advantage of providing an elastic element compared to a ball system is: the elastic element can provide an initial force between the base part and the movable part, and the initial force can control the moving distance of the movable part or keep the position of the movable part by matching with the driving force of the driving element, so that the position of the movable part can be controlled without additionally providing a driving element for providing conjugate driving force. If a ball system is employed, the movable portion is free to move in the xoy direction relative to the base portion in the case where the driving element does not provide driving force, and therefore it is often necessary to provide at least a pair of driving forces in opposition to each other to control the holding of the movable portion in its initial position.

Further, still referring to fig. 5, in one embodiment of the present application, anti-shake may be achieved by driving the entire photosensitive assembly 20 to move. Meanwhile, the circuit board 23, the photosensitive chip 21, the lens seat 22 and the optical filter 24 are packaged into a whole, the circuit board 23, the lens seat 22 and the optical filter 24 form a closed space, the photosensitive chip 21 is accommodated in the closed space, the sealing performance of the photosensitive assembly 20 is improved, and the imaging of the photosensitive chip 21 in the process of making or using the camera module is not influenced by dust.

Still referring to fig. 5, in one embodiment of the present application, the first driving part 30 is implemented to be adapted to drive the lens 10 to move in the optical axis direction to realize a focusing function, while also being adapted to drive the lens 10 to move in the xoy plane to realize an anti-shake function. Optionally, the first driving portion 30 includes at least two carriers, namely a first carrier 31 and a second carrier 32, the lens 10 is supported by the first carrier 31, a suspension system is disposed between the first carrier 31 and the second carrier 32, and a suspension system is disposed between the second carrier 32 and a housing 33 of the first driving portion 30. The suspension system between the first carrier 31 and the second carrier 32 (i.e., the first suspension system) in this embodiment is configured as a ball system, and the suspension system between the second carrier 32 and the housing 33 (i.e., the second suspension system) may be a ball structure (the ball structure may include, for example, a vertical groove and a plurality of balls disposed in the vertical groove), or may be a suspension system based on an elastic element (e.g., a spring). The bottom surface of the housing 33 may be mounted to the first base 34, and the first base 34 and the housing 33 may together constitute a first base portion of the first driving portion 30. In the present embodiment, the second suspension system is provided outside the first suspension system, the first suspension system allows the lens 10 and the first carrier 31 to translate in the xoy plane to realize the anti-shake function, and the second suspension system allows the lens 10, the first carrier 31, and the second carrier 32 to integrally move in the optical axis direction to realize the focusing function. Alternatively, in another embodiment, the second suspension system may also be arranged inside the first suspension system. In another variant embodiment, the second suspension system may also be arranged below the first suspension system. In this embodiment, the suspension system is a system in which two members are movably connected, and the degree of freedom (i.e., the moving direction) of relative movement of the two members is limited. These two articulating components may be referred to as a base portion and a movable portion, respectively. Typically, the suspension system is used in conjunction with a drive element (e.g., an SMA element or coil magnet combination). Wherein a driving force is provided by the driving element, under which driving force the movable part is moved relative to the base part in a movement direction defined by the suspension system.

Further, fig. 6a shows a schematic perspective view of the second driving part in an embodiment of the present application. Fig. 6b shows an exploded perspective view of the second drive part in one embodiment of the present application. Further, fig. 7 shows a schematic cross-sectional view of an image capturing module according to an embodiment of the present application, in which a cross-section of the second driving section is shown. Referring to fig. 7 in combination with fig. 6a and 6b, in the present embodiment, the second driving part 40 includes a second base part 41 and a second movable part 42. For convenience of description, in the paragraphs introducing the second driving portion 40, the second base portion 41 is sometimes simply referred to as the base portion 41, and the second movable portion 42 is simply referred to as the movable portion 42, which will not be described herein. In this embodiment, the base 41 includes a base 41a and a cover 41b, in this embodiment, the base 41a may be flat, and may be referred to as a bottom plate, the cover 41b includes a cover sidewall 41b1 and a rest 41b2 extending inward from a top of the cover sidewall 41b1, the movable portion 42 is located between the rest 41b2 and the base 41a, four corner regions of the base 41a may be provided with grooves 41a1, and balls are placed in the grooves 41a 1. The bottom surface of the movable portion 42 is in contact with the balls and supported by the balls 46, thereby forming a movable connection between the base portion 41 and the movable portion 42. The support table 41b2 and the base 41a can hold the movable portion 42 therebetween, and limit the movement of the movable portion 42 in the z-axis direction. The degree of freedom of movement of the movable portion 42 with respect to the base portion 41 is thus limited to the xoy plane, and specifically, the degree of freedom of movement of the movable portion 42 with respect to the base portion 41 may include x-axis translation, y-axis translation, and rotation about the z-axis (i.e., rotation in the xoy plane). In the present embodiment, the grooves 41a1 are disposed at the positions corresponding to the balls 46, so that the balls 46 can be placed in the grooves 41a1 during the assembly process, thereby facilitating the assembly of the second driving portion 40; on the other hand, the recess 41a1 can limit the maximum movement distance of the movable portion 42 with respect to the base portion 41, and avoid collision during the relative movement of the movable portion 42 and the base portion 41. As shown in fig. 6b, in the present embodiment, four grooves 41a1 may be provided on the upper surface of the base 41a of the base 41, and four balls 46 may be provided in the four corner regions of the second driving portion 40 (refer to fig. 6 b). Of course in other embodiments grooves and balls may be provided at the four sides of the second drive part.

Further, in one embodiment of the present application, in the second driving portion 40, the inner side surface of the sidewall of the base portion 41 and the outer side surface of the movable portion 42 have a first gap 43, where the first gap 43 is greater than the maximum distance of anti-shake movement of the movable portion 42 (i.e. the maximum unidirectional stroke, where the unidirectional direction may be, for example, the positive x-axis direction, the negative x-axis direction, the positive y-axis direction or the negative y-axis direction), and the first gap 43 may be typically greater than 200 μm. In this embodiment, the ball structure is adopted to realize the movable connection, so that the movement resistance of the movable portion 42 can be reduced, the driving force required for driving the movable portion 42 to move can be reduced, and the movable portion 42 can be designed to have a larger stroke. Thus, in some embodiments, the first gap 43 may be greater than 300 μm.

Further, in an embodiment of the present application, in the second driving portion 40, a second gap 44 may be formed between the lower surface of the bearing table 41b2 and the movable portion 42, and the second gap 44 may be smaller than 10 μm to reduce friction between the movable portion 42 and the bearing table 41b 2. This reduces frictional resistance while also avoiding friction debris generation. Meanwhile, since the second gap 44 is smaller, the rest 41b2 can still limit the movable portion 42 in the z-axis direction, avoiding the movement of the movable portion 42 from deviating from the xoy plane.

Further, in one embodiment of the present application, in the second driving portion 40, a third gap 45 is formed between the lower surface of the movable portion 42 and the upper surface of the base 41 a. Typically, the ball diameter is greater than the depth of the groove in which the ball is received. The third gap 45 may be, for example, less than 10 μm.

Further, in one embodiment of the present application, in the second driving portion 40, the upper surface of the cover 41b (i.e. the upper surface of the bearing table 41b 2) is higher than the top surface of the photosensitive assembly 20 (the mirror base), so as to avoid the photosensitive assembly 20 rubbing against the first driving portion 30 during the horizontal movement.

Further, fig. 8a shows a ball structure of the second driving part in a modified embodiment of the present application. Referring to fig. 8a, in the present embodiment, the number of balls 46 between the base portion 41 and the movable portion 42 of the second driving portion 40 may be three, and the number of corresponding grooves 41a1 for accommodating the balls 46 may be three. In fact, the number of balls and the positions at which the balls are disposed may be such that the movable portion 42 can be supported on a reference surface (for example, a horizontal surface). Wherein the reference plane is the xoy plane. In this embodiment, the bottom surface of the groove 41a1 is configured to be planar, and the balls can freely move on the bottom surface of the groove 41a1, so as to allow the movable portion 42 to translate in the x-axis and the y-axis, and also allow the movable portion 42 to translate and rotate in the xoy-plane (as shown in fig. 8b, fig. 8b shows a schematic view of the movable portion rotating in the xoy-plane). On the other hand, referring to fig. 7 in combination, in this embodiment, the balls 46 are disposed below the photosensitive member 20, that is, the balls 46 and the projection of the photosensitive member 20 on the reference plane at least partially overlap, or, in a top view, the balls 46 are located entirely within the projection range of the photosensitive member 20 or at least partially within the projection range of the photosensitive member 20. This design can avoid the ball mechanism from occupying an extra space in the radial direction (i.e., in the x-axis or y-axis direction) of the camera module, and helps to reduce the lateral dimension (i.e., the dimension in the x-axis or y-axis direction) of the second driving portion 40, which is beneficial to miniaturization of the module.

Further, fig. 9 is a schematic diagram showing a typical assembly manner of the second driving part in one embodiment of the present application. Referring to fig. 9, in the present embodiment, the second driving part 40 may be assembled by three main members separated from each other, which are a base 41a, a cover 41b, and a movable part 42, respectively, which may be assembled in a vertical direction. For example, the assembly of the second driving part 40 may be completed by disposing the base 41a having the balls 46 on the assembly table, then disposing the movable part 42 above the base 41a so as to be supported by the balls 46 in the base 41a, finally moving the cover 41b above the base 41a and the movable part 42, then moving the cover 41b downward so that the bottom surface of the cover sidewall 41b1 approaches the top surface of the base 41a, and then bonding the bottom surface of the cover sidewall 41b1 with the top surface of the base 41 a. In fig. 9, the susceptor 41a has a flat plate shape, and has no susceptor side wall, and thus may be referred to as a substrate or a bottom plate. However, it should be noted that in other embodiments, the base 41a may be formed by a base side wall and a base plate, and based on this base, a second driving part as shown in fig. 13b may be assembled, and the assembling method may be identical to that shown in fig. 9. Namely, three main members separated from each other of the base, the cover and the movable portion are prepared first, and then the three are assembled together in the vertical direction.

Fig. 10 is a schematic diagram showing an exploded state before assembly of the second driving part in another embodiment of the present application. Fig. 11 shows a schematic view of an intermediate state in the assembly process of the second driving part in another embodiment of the present application. In the present embodiment, the second driving part 40 may be assembled in a lateral assembly manner. Specifically, three main members separated from each other of the base portion main body 41', the movable portion 42, and the side cover 41b″ may be prepared first (refer to fig. 10). Wherein the base body 41 'may comprise a base 41a and a cover body 41b' (in some embodiments, the base 41a and the cover body 41b 'may be integrally formed) connected to the base 41a, the cover body 41b' being part of a complete cover 41b, which together with the side cover 41b″ forms the complete cover 41b. In this embodiment, the cover body 41b 'may surround the movable portion 42 (or the photosensitive member) on three sides, for example, and the other side may leave a notch for inserting the movable portion 42 (or the combination of the movable portion 42 and the photosensitive member) into the base body 41' from the side. The side cover 41b "corresponds to the notch, and after the combination of the movable portion 42 and the photosensitive assembly is inserted from the notch (refer to fig. 10 and 11), the side cover 41b" can be laterally accessed to the base 41a, and the outer side surface of the base 41a and the inner side surface of the side cover 41b "are bonded together, so as to form the complete second driving portion 40. In this manner of bonding and fixing from the side, the parallelism of the upper and lower end surfaces of the base portion 41 is determined only by the manufacturing accuracy of the base portion 41 itself, and therefore, the manner of bonding and fixing from the side can improve the parallelism of the upper and lower end surfaces of the base portion 41 and the parallelism between the upper end surface of the base portion 41 and the movable portion 42.

Further, fig. 12 shows an installation position of the driving element of the second driving part in an embodiment of the present application in a top view. Fig. 13a shows a schematic cross-sectional view of a driving element comprising a second driving part in an embodiment of the present application. Referring to fig. 12 and 13a in combination, in one embodiment of the present application, the driving element of the second driving portion 40 is a coil magnet combination. Wherein the magnet 61 may be provided at an edge region of the bottom plate of the base portion 41 (i.e., the base 41 a), and the coil 62 may be provided at an edge region of the movable portion bottom plate 42a of the movable portion 42. In this embodiment, the magnet may be provided on the bottom plate of the base portion 41. Further, the coil 62 may be soldered to and conducted with the wiring board 23 of the photosensitive assembly 20 through an FPC board (flexible board) provided on the movable portion 42. The provision of the coil 62 at the movable portion 42 has an advantage in that the movable portion 42 and the photosensitive member 20 are moved synchronously during the anti-shake process, and the welding of the coil 62 to the circuit board 23 through the FPC board ensures that there is no relative movement of the wires or the welded portions during the movement, thereby reducing the risk of electrical failure at the welded portions. It should be noted that the connection manner by the FPC board is not the only electrical connection manner in the present application, and in another embodiment, the coil may be electrically connected to the bottom surface of the circuit board through a contact or a contact array provided on the upper surface of the movable portion. The arrangement of the driving elements shown in fig. 13a helps to reduce the lateral dimension (i.e., the dimension perpendicular to the optical axis) of the camera module.

Further, fig. 13b shows a schematic cross-sectional view of the driving element of the second driving part in another embodiment of the present application. In the present embodiment, the coil 62 and the magnet 61 may be provided on the side walls of the movable portion 42 and the base portion 41. This design is advantageous in reducing the thickness of the second driving portion 40, thereby reducing the height of the camera module. Specifically, in the present embodiment, the magnet 61 is provided on the base 41a of the base 41 instead of the cover 41b, and this design can leave a connection (may be adhesive) area of the base 41 and the first driving portion 30.

Still referring to fig. 12, in one embodiment of the present application, preferably, three coil magnet pairs (one coil magnet pair, i.e., one coil magnet combination) are provided, which are referred to as a first coil magnet pair 63, a second coil magnet pair 64, and a third coil magnet pair 65, respectively. The first pair of coil magnets 63 and the second pair of coil magnets 64 are used to drive the translation of the movable portion 42 in the x-axis direction, that is, to provide a driving force in the x-axis direction. The third pair of coil magnets 65 is used to drive the translation of the movable portion 42 in the y-axis direction, i.e., to provide a driving force in the y-axis direction. The first coil magnet pair 63 and the second coil magnet pair 64 may be disposed along two opposite sides of the second driving part, which may be referred to as a first side 48 and a second side 49, respectively, in a top view (or a bottom view), the first side 48 and the second side 49 not intersecting. And the second pair of coil magnets 64 may be arranged along a third side 47 of the second driving part, the third side 47 intersecting both the first side 48 and the second side 49. In this embodiment, the three coil magnet pairs can realize both x-axis translation and y-axis translation, and also can realize rotation on the xoy plane. For example, when the first coil magnet pair 63 and the second coil magnet pair 64 provide driving forces in opposite directions, a combined driving force for rotating the movable portion in the xoy plane can be generated. Note that the manner of providing the driving force for the rotation in the xoy plane is not exclusive, and for example, a combined driving force for rotating the movable portion in the xoy plane may be generated by operating the first coil magnet pair 63 and the third coil magnet pair 65. Optionally, the positions of the first coil magnet pair and the second coil magnet pair may be staggered (i.e., the positions of the first coil magnet pair and the second coil magnet pair may be asymmetric about the central axis of the second driving portion), so as to provide a driving force to implement rotation of the movable portion in the xoy plane (i.e., movement in the Rz direction).

Further, fig. 14 is a schematic diagram illustrating an assembly manner of the camera module in an embodiment of the present application. In this embodiment, alternatively, the lens 10 is first mounted on the first driving portion 30, the photosensitive assembly 20 is mounted on the second driving portion 40, then the relative position between the photosensitive assembly 20 and the lens 10 is adjusted through an active calibration process, and then the first driving portion 30 and the second driving portion 40 are adhered and fixed through the glue 92, so that the relative position of the bonded photosensitive assembly 20 and the lens 10 is kept at the relative position determined by the active calibration. In this embodiment, the glue 92 may be provided between the base portion of the first driving portion 30 and the base portion of the second driving portion 40, for example.

Further, fig. 15a shows an arrangement of the camera module and the connection belt thereof in an embodiment of the present application. In this embodiment, the camera module may include a first connection belt 26a and a second connection belt 26b, where the first connection belt 26a is disposed at a top region of the first driving portion 30 and is electrically connected to the first driving portion 30, and the second connection belt 26b is in communication with the circuit board 23 of the photosensitive assembly 20. The second connecting strip 26b may be provided with a plurality of bends to form a bending lamination shape to buffer the stress caused by the movement of the photosensitive assembly 20. The end of the second connecting strap 26b may be provided with a connector, which is optionally fixed by pressing and electrically connected to the center pillar 26c, and then conducts the main board (or other member) of the terminal device through the center pillar 26 c. Likewise, the end of the first connecting strap 26a may also be connected to a connector that is fixed by pressing and electrically connected to the center pillar 26c, and then conducts the main board (or other components) of the terminal device through the center pillar 26 c. In the solution of this embodiment, the conducting circuit of the first driving portion 30 may be separated from the photosensitive assembly 20, and is not affected by the movement of the photosensitive assembly 20. The second connection strap 26b and the center post 26c may be accommodated in a second housing 70 (the second housing 70 may be one connection strap receiving housing), the first connection strap 26a is located outside the second housing 70, and a top of the second housing 70 may have a third through hole 70a so that a connector of the first connection strap 26a is extended into and electrically conducted with the second connection strap 26b or the center post 26 c. Further, fig. 15b shows a schematic perspective view of the second driving part in one embodiment of the present application. Referring to fig. 15a and 15b in combination, it can be seen that in this embodiment, both the movable portion 42 and one side of the base portion 41 have a slot or window so that the first connecting strap passes through the side wall of the movable portion 42 and the side wall of the base portion 41.

In the above embodiment, the first driving portion and the second driving portion may constitute a dual optical anti-shake driving structure (may also be referred to as a dual OIS driving structure). In the driving structure, the first driving part is suitable for installing a lens, the second driving part is suitable for installing a photosensitive assembly, and the lens and the photosensitive chip are configured to be driven simultaneously and move towards opposite directions. For example, if the lens is driven to move towards the positive direction of the x axis, the photosensitive chip is driven to move towards the negative direction of the x axis; the lens is driven to move towards the positive direction of the y axis, and the photosensitive chip is driven to move towards the negative direction of the y axis; or the lens is driven to move in the x-axis and the y-axis while the photosensitive chip is driven to move in the x-axis and the y-axis in the opposite direction to the movement of the lens, in other words, when the movement in the x-axis and the y-axis is required to be simultaneously performed, the directions of the displacement vector of the lens and the displacement vector of the photosensitive chip are opposite in the xoy plane. In some embodiments of the present application, the lens and the photosensitive chip are configured to move simultaneously, and the moving directions of the lens and the photosensitive chip are opposite, so that a faster response can be achieved, and a better anti-shake effect is achieved. In addition, the anti-shake angle range of the conventional camera module is limited by the suspension system and the driving system, and a relatively large compensation angle range cannot be achieved. In addition, compared with some anti-shake schemes in the prior art that only drive the lens to move, in some embodiments of the present application, by driving the lens or the photosensitive chip to move in opposite directions at the same time, a larger relative movement stroke (for convenience of description, the relative movement stroke may be simply referred to as an anti-shake stroke) is provided between the lens and the photosensitive chip, which may have a better compensation effect. Especially, because the increase of anti-shake journey, this application also has better compensation effect to the slope shake of module of making a video recording. Further, in some embodiments of the present application, the movement direction of the anti-shake movement may be limited in the xoy plane, so that the optical axis of the lens or the photosensitive chip does not need to be tilted, thereby avoiding the problem of image sticking caused by the anti-shake movement.

Further, fig. 17 is a schematic cross-sectional view of an image capturing module according to another embodiment of the present application. Referring to fig. 17, in the second driving portion 40, a ball structure is disposed on the outer side of the photosensitive assembly 20, so as to avoid the ball structure occupying the space of the camera module in the height direction (i.e., in the z-axis direction) in order to reduce the height of the camera module. Further, in the second driving part 40, the base part 41 may include a base 41a and a cover 41b. Wherein the base 41a includes a base plate 41a2 and a base sidewall 41a3 formed to extend upward from an edge of the base plate 41a2, a top surface of the base sidewall 41a3 may be provided with a first groove 41a4 to accommodate the ball 46. The cover 41b includes a cover side wall 41b1 and a rest 41b2 formed to extend inward from the top of the cover side wall 41b 1. The bottom surface of the cover sidewall 41b1 may be joined (e.g., bonded) to the top surface of the base sidewall 41a3, and the base sidewall 41a3 and the cover sidewall 41b1 may together form a complete base sidewall. The movable portion 42 may include a movable portion bottom plate 42a, a movable portion side wall 42b and an extension structure 42c, wherein the movable portion side wall 42b is formed to extend upward from an edge of the movable portion bottom plate 42a, and the photosensitive member 20 may be fixed in a receiving groove formed by the movable portion bottom plate 42a and the movable portion side wall 42 b. The epitaxial structure 42c is formed extending outwardly from the top of the movable portion sidewall 42 b. The epitaxial structure 42c is located between the rest table 41b2 of the base portion 41 and the top surface of the susceptor side wall 41a 3. The extension structure 42c may be located above the first groove 41a4 on the top surface of the base sidewall 41a3, and the lower surface thereof may be supported by the balls 46, so that the movable portion 42 is movably connected with the base portion 41. In this embodiment, a fourth gap may be provided between the rest table 41b2 of the base portion 41 and the extension structure 42c of the movable portion 42, and the fourth gap may be smaller than 10 μm, so that the rest table 41b2 may have a limiting effect on the movable portion 42 in the z direction, and friction between the rest table 41b2 and the movable portion 42 may be reduced. The movable portion side wall 42b and the base side wall 41a3 may have a fifth gap therebetween, which may be greater than 200 μm, so as to allow the movable portion 42 to have a lateral movement stroke of 200 μm in one direction. Further, the fifth gap may be greater than 300 μm to further increase the lateral movement stroke of the movable portion 42, enhancing the anti-shake capability thereof. In this embodiment, the camera module has two driving components, wherein the first driving portion for driving the lens assembly tends to have a relatively large lateral dimension, so in this embodiment, even if the lateral dimension of the second driving portion is slightly increased, the overall lateral dimension of the module is not significantly increased, but the space outside the photosensitive assembly can be more fully utilized to significantly reduce the height of the module. On the other hand, there is a trend toward multiple cameras in mobile terminals (e.g., mobile phones), and the area of the multiple camera module mounting area of the mobile terminal (the multiple camera module mounting area is usually in the shape of a boss on the back of the mobile phone) is relatively large, so that the limitation on the lateral dimension of a single camera module is small. In this embodiment, the ball structure is disposed on the outer side of the photosensitive assembly (that is, the outer side of the photosensitive assembly), so that the height of the camera module can be reduced, which is beneficial to reducing the height of the protruding portion of the multi-camera module mounting area of the mobile terminal (such as a mobile phone), and can significantly improve the user experience of the mobile terminal (such as a mobile phone).

Further, fig. 18 shows a schematic cross-sectional view of an image capturing module according to still another embodiment of the present application. Referring to fig. 18, in the present embodiment, two layers of balls may be disposed between the base portion 41 and the movable portion 42 of the second driving portion 40, so that friction generated when the movable portion 42 moves relative to the base portion 41 is avoided, and the cover 41b of the base portion 41 can have a better limit effect in the z-axis direction. Specifically, the base portion 41 may include a base 41a and a cover 41b. Wherein the base 41a includes a base plate 41a2 and a base sidewall 41a3 formed to extend upward from an edge of the base plate 41a2, a top surface of the base sidewall 41a3 may be provided with a first groove 41a4 so as to accommodate the first ball 46a. The cover 41b includes a cover side wall 41b1 and a rest 41b2 formed to extend inward from the top of the cover side wall 41b 1. The bottom surface of the cover sidewall 41b1 may be joined (e.g., bonded) to the top surface of the base sidewall 41a3, and the base sidewall 41a3 and the cover sidewall 41b1 may together form a complete base sidewall. The movable portion 42 may include a movable portion bottom plate 42a, a movable portion side wall 42b and an extension structure 42c, wherein the movable portion side wall 42b is formed to extend upward from an edge of the movable portion bottom plate 42a, and the photosensitive member 20 may be fixed in a receiving groove formed by the movable portion bottom plate 42a and the movable portion side wall 42 b. The extension structure 42c is formed to extend outwardly from a central portion of the movable portion sidewall 42 b. The epitaxial structure 42b is located between the rest table 41b2 of the base portion 41 and the top surface of the susceptor side wall 41a 3. The extension structure 42b may be located above the first groove 41a4 on the top surface of the base sidewall 41a3, and the lower surface of the extension structure 42b may be supported by the first ball 46a, so that the movable portion 42 is movably connected with the base portion 41. Unlike the embodiment of fig. 17, in this embodiment, the upper surface of the extension structure 42c is disposed in the second groove 42b1, the second groove 42b1 is provided with the second ball 46b, and the bearing table 41b2 of the base portion 41 may be supported by the second ball 46 b. The second balls 46b are added, so that the connection between the rest 41b2 and the movable portion 42 in the z-axis direction is rigid, and an excellent stopper effect is obtained. At the same time, when the movable portion 42 moves laterally relative to the base portion 41 (refer to movement in the xoy plane), the second balls 46b also function to reduce the movement resistance, and also prevent the friction of the rest table 41b2 with the extension structure 42c from generating chips.

Further, based on the description of fig. 18 and the corresponding embodiments, it can be understood that the embodiments corresponding to fig. 7 and 8 can also be modified by using a two-layer ball design to improve the z-axis limiting effect, while avoiding friction between the cover and the movable portion.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

An optical anti-shake camera module, comprising:

a lens;

a photosensitive assembly having a photosensitive chip;

a first driving part adapted to mount the lens and drive the lens to translate in x-axis and y-axis directions; and

the second driving part is suitable for driving the photosensitive chip to translate in the directions of the x axis and the y axis, the second driving part comprises a second base part and a second movable part, the second base part comprises a base and a cover, at least one part of the base is positioned below the photosensitive assembly, the bottom of the cover is connected with the base, and the top of the cover is connected with the first driving part; the second movable part is movably connected with the second base part through a ball, and the freedom of movement is limited in an xoy plane through the ball;

Wherein the lens and the photosensitive chip are configured to move in opposite directions; and the balls are positioned on the outer side of the outer side surface of the photosensitive assembly.
The optical anti-shake camera module according to claim 1, wherein the second driving portion is further configured to drive the photosensitive chip to rotate on an xoy plane.
The optical anti-shake camera module according to claim 1, wherein a lens movement distance b by which the first driving module drives the lens to move and a photosensitive chip movement distance c by which the second driving module drives the photosensitive chip to move are determined according to the detected tilt shake angle a of the camera module; the lens moving distance b, the photosensitive chip moving distance c and the image space focal length f of the camera module satisfy the following conditions: a=arctan (b/f) +arctan (c/f).
The optical anti-shake camera module according to claim 3, wherein the driving structure further comprises a driving logic module for maintaining a ratio of the lens moving distance b to the photosensitive chip moving distance c at a preset fixed ratio.
The optical anti-shake camera module according to claim 3, wherein the driving structure further comprises a driving logic module having an anti-shake threshold K, the driving logic module being configured to maintain a ratio of the lens moving distance b to the photosensitive chip moving distance c at a predetermined fixed ratio when the tilt shake angle a is less than or equal to the anti-shake threshold K, and to make the photosensitive chip moving distance c reach a maximum value c of a moving stroke thereof when the tilt shake angle a is greater than the anti-shake threshold K _max The lens movement distance b is according to the relation b=tan (a/f) -c _max And (5) calculating to obtain the product.
The optical anti-shake imaging module according to claim 4 or 5, wherein the preset fixed ratio of the lens movement distance and the photosensitive chip movement distance is set according to the weight of the lens, the driving force of the first driving portion, the weight of the photosensitive chip or photosensitive assembly, and the driving force of the second driving portion so that the times at which the lens and the photosensitive chip move to the respective anti-shake target positions are identical.
The optical anti-shake imaging module according to claim 1 or 2, wherein the first driving section includes a first base section and a first movable section; the top of the cover is fixed with the first base part, the second movable part is positioned above the base and is movably connected with the second base part, and the photosensitive assembly is fixed on the upper surface of the second movable part; the second movable part is movably connected with the second base part through the ball, wherein the upper surface of the second base part, the ball and the lower surface of the second movable part are sequentially supported in the z-axis direction, so that the movement freedom degree of the second movable part relative to the second base part is limited within an xoy plane, and the z-axis is perpendicular to the xoy plane.
The optical anti-shake imaging module according to claim 7, wherein the balls are arranged in four corner regions of the second driving portion in a plan view.
The optical anti-shake camera module according to claim 7, wherein the second base portion is provided with at least three grooves, and at least three balls are disposed in the at least three grooves to carry the second movable portion on the xoy plane.
The optical anti-shake imaging module according to claim 7, wherein the second movable portion includes a movable portion bottom plate and a movable portion side wall formed extending upward from an edge region of the movable portion bottom plate; the photosensitive assembly is arranged in a containing groove formed by the movable part bottom plate and the movable part side wall; glue is arranged between the inner side surface of the side wall of the movable part and the outer side surface of the photosensitive assembly so as to fix the second movable part and the photosensitive assembly together.
The optical anti-shake camera module of claim 10, wherein the cover includes a cover sidewall and a rest stand extending inwardly from a top of the cover sidewall; the second movable part further comprises an epitaxial structure formed by extending outwards from the side wall of the movable part; the susceptor comprises a substrate and a susceptor side wall formed by extending upwards from an edge area of the substrate, the substrate is positioned below the photosensitive assembly, a top surface of the susceptor side wall is provided with a first groove, the balls are positioned in the first groove, and the lower surface of the epitaxial structure is supported by the balls.
The optical anti-shake camera module of claim 11, wherein the cover sidewall and the base sidewall are joined to form a complete base sidewall.
The optical anti-shake camera module according to claim 11, wherein the epitaxial structure is formed by extending outward from the top of the movable portion sidewall.
The optical anti-shake camera module according to claim 13, wherein a fourth gap is provided between the lower surface of the support table and the upper surface of the epitaxial structure, and the fourth gap is smaller than 10 μm.
The optical anti-shake camera module of claim 11, wherein the ball comprises a first ball and a second ball; the first balls are located in the first grooves, the extension structure is formed by extending outwards from the middle of the side wall of the movable part, the upper surface of the extension structure is provided with a second groove, the second balls are located in the second grooves, and the lower surface of the bearing table is supported by the second balls.
The optical anti-shake camera module according to claim 15, wherein the base includes a substrate, and the driving element of the second driving portion is a coil magnet combination; wherein the magnet is arranged at the edge area of the substrate, and the coil is arranged at the edge area of the movable part bottom plate; or the coil and the magnet are respectively arranged on the side walls of the second movable part and the second base part.
The optical anti-shake camera module of claim 16, wherein the combination of coil magnets includes a first pair of coil magnets, a second pair of coil magnets, and a third pair of coil magnets; wherein the first coil magnet pair and the second coil magnet pair are used for providing driving force in the x-axis direction; the third coil magnet pair is used for providing driving force in the y-axis direction; and the first coil magnet pair and the second coil magnet pair may be arranged along a first side and a second side of the second driving part, respectively, the first side and the second side being disjoint, and the second coil magnet pair being arranged along a third side of the second driving part, the third side being intersected by both the first side and the second side, in a plan view.
The optical anti-shake camera module according to claim 11, wherein a fifth gap is provided between the movable portion side wall and the base side wall, the fifth gap being greater than 200 μm.