CN220511179U

CN220511179U - Camera module and electronic equipment

Info

Publication number: CN220511179U
Application number: CN202322194975.XU
Authority: CN
Inventors: 聂磊; 邓浩
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2023-08-15
Filing date: 2023-08-15
Publication date: 2024-02-20
Anticipated expiration: 2033-08-15

Abstract

The application provides a camera module and electronic equipment, relates to the technical field of camera automatic focusing, and comprises a shell, an elastic sleeve, a lens and a shape memory alloy wire; the elastic sleeve is fixed in the shell, and at least part of the lens is penetrated in the elastic sleeve; the elastic sleeve comprises an adjusting section, the inner wall of the adjusting section is matched with the lens in an arc surface manner, and the curvature center of the arc surface is positioned in the elastic sleeve; the adjusting section is used for driving the lens to move along the axial direction of the elastic sleeve through self deformation; the shape memory alloy wire is wound on the outer wall of the adjusting section, the shape memory alloy wire contracts towards the direction close to the center of the adjusting section under the condition that the shape memory alloy wire is electrified, and the shape memory alloy wire relaxes towards the direction far away from the center of the adjusting section under the condition that the shape memory alloy wire is powered off so as to drive the adjusting section to deform.

Description

Camera module and electronic equipment

Technical Field

The application relates to the technical field of camera automatic focusing, in particular to a camera module and electronic equipment.

Background

With the development of electronic technology, cameras supporting automatic focusing are more and more in electronic products such as mobile phones, and with the appearance of new mobile phone forms such as folding screens, the design of magnetic fields in mobile phones is more and more complex.

At present, common modes for driving a camera to focus in a mobile phone comprise a direct current motor driving mode, an ultrasonic motor driving mode, a stepping motor driving mode, a linear motor driving mode, a voice coil motor driving mode and the like, wherein the voice coil motor driving mode is most widely applied, the mode drives the camera to move through a magnet matched with ampere force generated by an electrified coil, and the coil is controlled to drive the camera to move accurately through controlling the size and the direction of current.

However, this approach may have a serious magnetic interference problem, and the voice coil motor needs to have a plurality of magnets arranged inside the motor iron shell to generate ampere force with the coil, so when there are a plurality of cameras in the mobile phone, there may be mutual superposition of magnetic fields between different cameras and other magnetic elements in the mobile phone, which affects the focusing accuracy of the cameras.

Disclosure of Invention

The embodiment of the application provides a camera module and electronic equipment to solve current camera mode of focusing and have the magnetic interference problem, influence the problem of camera focusing precision.

In order to solve the technical problems, the application is realized as follows:

in a first aspect, embodiments of the present application provide a camera module including a housing, an elastic sleeve, a lens, and a shape memory alloy wire;

the elastic sleeve is fixed in the shell, and at least part of the lens is penetrated in the elastic sleeve;

the elastic sleeve comprises an adjusting section, the inner wall of the adjusting section is matched with the lens in an arc surface manner, and the curvature center of the arc surface is positioned in the elastic sleeve; the adjusting section is used for driving the lens to move along the axial direction of the elastic sleeve through self deformation;

the shape memory alloy wire is wound on the outer wall of the adjusting section, the shape memory alloy wire contracts towards the direction close to the center of the adjusting section under the condition that the shape memory alloy wire is electrified, and the shape memory alloy wire relaxes towards the direction far away from the center of the adjusting section under the condition that the shape memory alloy wire is powered off, so that the adjusting section is driven to deform.

In a second aspect, an embodiment of the present application further provides an electronic device, including any one of the foregoing camera modules.

In this application embodiment, the camera module passes through the cambered surface cooperation of elastic sleeve adjustment section and camera lens to and the shrink or the expansion of shape memory alloy line is to the deformation that leads to the fact of adjustment section, makes the camera lens move along the axial of elastic sleeve, has realized the automatic focusing of camera lens, compares in traditional mode that utilizes voice coil motor drive to realize camera lens automatic focusing, does not need the rethread magnet to promote the camera lens motion, has effectively solved the magnetic interference problem, thereby guarantee the focusing accuracy of camera, also help realizing the miniaturization and the light and handiness of camera module.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a camera module according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an embodiment of the present application before lens movement;

FIG. 3 is a diagram illustrating a force analysis of a lens barrel according to an embodiment of the present application;

FIG. 4 is a schematic view of a lens according to an embodiment of the present application _。

The device comprises a 1-shell, a 2-elastic sleeve, a 21-adjusting section, a 22-limiting section, a 3-lens, a 31-movable part, a 32-mounting groove, a 4-shape memory alloy wire, a 5-magnetic part, a 6-Hall element, a 7-base, an 8-image sensor and a 9-optical filter.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present application, it should be understood that the sequence numbers of the following processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Referring to fig. 1 to 3, the embodiment of the present application provides a camera module including a housing 1, an elastic sleeve 2, a lens 3, and a shape memory alloy wire 4; the elastic sleeve 2 is fixed in the shell 1, and at least part of the lens 3 is penetrated in the elastic sleeve 2; the elastic sleeve 2 comprises an adjusting section 21, the inner wall of the adjusting section 21 is matched with the lens 3 in a cambered surface manner, and the curvature center of the cambered surface is positioned in the elastic sleeve 2; the adjusting section 21 is used for driving the lens 3 to move along the axial direction of the elastic sleeve 2 through self deformation; the shape memory alloy wire 4 is wound on the outer wall of the adjusting section 21, the shape memory alloy wire 4 contracts towards the direction close to the center of the adjusting section 21 under the condition that the shape memory alloy wire 4 is electrified, and the shape memory alloy wire 4 expands towards the direction far away from the center of the adjusting section 21 under the condition that the shape memory alloy wire 4 is powered off, so as to drive the adjusting section 21 to deform.

In this embodiment, as shown in fig. 1 to 3, the camera module includes a housing 1, an elastic sleeve 2, a lens 3 and a shape memory alloy wire 4 (Shape Memory Alloy, SMA wire), the elastic sleeve 2 is fixed in the housing 1, at least part of the lens 3 is disposed in the elastic sleeve 2 in a penetrating manner, and the shape memory alloy wire 4 is wound on the outer wall of the elastic sleeve 2. The elastic sleeve 2 can be made of materials such as silica gel and rubber, has certain elastic deformation capability, and can apply pressure to the lens 3 when deformation occurs, so that the lens 3 moves along the axial direction of the elastic sleeve 2. In order to ensure that the lens 3 slides smoothly in the elastic sleeve 2, the inner wall of the elastic sleeve 2 may be provided with a smooth surface, or lubricating oil may be smeared on the surface of the housing of the lens 3 before the lens 3 is mounted. The lens 3 is substantially composed of a lens and a housing wrapped outside the lens, and the lens 3 is usually configured to have a thinner upper portion and a thicker lower portion, so as to enhance the stability of the lens 3 in installation and movement. Fig. 2 shows a structural cross-section of a camera module, as shown in fig. 2, an elastic sleeve 2 is sleeved on the lower part of a lens 3, and the lower part of the lens 3 can be designed into a cambered surface structure so as to facilitate the movement of the lens 3 in the elastic sleeve 2. The elastic sleeve 2 comprises an adjusting section 21, the inner wall of the adjusting section 21 is matched with the lens 3 in an arc surface, and the curvature center of the arc surface is positioned in the elastic sleeve 2. The deformation of the elastic sleeve 2 is mainly the deformation of the adjusting section 21, and the inner diameter of the adjusting section 21 is changed by the deformation of the adjusting section, so that pressure is applied to the lens 3, the lens 3 is driven to move along the axial direction of the elastic sleeve 2, and the adjustment of the focal length of the lens 3 is realized. In a preferred embodiment, the inner diameter of the elastic sleeve 2 is set to be slightly smaller than the outer diameter of the lens 3, so that no gap exists between the lens 3 and the elastic sleeve 2, and the lens 3 moves axially under the condition that the adjusting section 21 of the elastic sleeve 2 deforms and extrudes, rather than directly moves axially under the action of gravity, so that the focal length adjusting precision of the lens 3 is ensured.

As shown in fig. 2, the shape memory alloy wire 4 is wound on the outer wall of the adjusting section 21 of the elastic sleeve 2, the shape memory alloy wire 4 is a wire which can contract or relax according to the current magnitude and temperature change inside, such as a nickel-titanium memory alloy wire, when the shape memory alloy wire 4 is electrified, the temperature inside the shape memory alloy wire 4 is increased, the shape memory alloy wire 4 contracts towards the direction close to the center of the adjusting section 21, the adjusting section 21 is extruded, the inner diameter of the adjusting section 21 is reduced, when the shape memory alloy wire 4 is in the outage, the temperature inside the shape memory alloy wire 4 is reduced, the shape memory alloy wire 4 is relaxed towards the direction far from the center of the adjusting section 21, the adjusting section 21 is not extruded any more, and the inner diameter of the adjusting section 21 is increased, thereby realizing the deformation of the adjusting section 21. Fig. 3 shows a force analysis diagram of the lens 3, as shown in fig. 3, since the inner wall of the adjusting section 21 is in cambered surface fit with the lens 3, the pressure F applied to the lens 3 by the inner wall of the adjusting section 21 forms a component force F1 along the axial direction of the elastic sleeve 2 and a component force F2 perpendicular to the axial direction of the elastic sleeve 2, wherein the component force F2 perpendicular to the axial direction of the elastic sleeve 2 counteracts under interaction, and the component force F1 along the axial direction of the elastic sleeve 2 is superimposed under interaction to move the lens 3 along the axial direction of the elastic sleeve 2. It will be appreciated that during movement of the lens 3, the focal length of the lens 3 changes accordingly, thereby achieving auto-focusing of the lens 3.

According to the camera module, the elastic sleeve is matched with the cambered surface of the lens, and the deformation caused by contraction or relaxation of the shape memory alloy wire is caused by the contraction or relaxation of the elastic sleeve, so that the lens moves along the axial direction of the elastic sleeve, automatic focusing of the lens is achieved, compared with a traditional mode of realizing automatic focusing of the lens by using voice coil motor driving, the problem of magnetic interference is effectively solved by pushing the lens to move without a magnet, and focusing precision of the camera is guaranteed, and miniaturization and light-weight of the camera module are also facilitated. Meanwhile, the driving force is indirectly generated through contraction or relaxation of the shape memory alloy wire, so that the problem of insufficient thrust of the lens can be effectively solved, the power consumption of the camera module is reduced, dust is not easy to generate in the sliding process of the lens in the elastic sleeve to form dirt, and the problem of black clusters can be effectively solved.

Alternatively, referring to fig. 2, the outer wall of the adjusting section 21 is a cambered surface, and the curvature center of the cambered surface is located in the elastic sleeve 2.

In this embodiment, the outer wall of the adjusting section 21 may be designed as an arc surface, the curvature center of the arc surface is also located in the elastic sleeve 2, the shape memory alloy wire 4 is wound on the arc surface, when contraction or relaxation occurs, the component force of the force acting on the outer wall of the adjusting section 21 in the axial direction of the elastic sleeve 2 is larger, so that the component force of the pressure applied by the inner wall of the adjusting section 21 to the lens 3 in the axial direction of the elastic sleeve 2 is larger, which is more helpful to push the lens 3 to move, and the electric power resource of the camera module is saved to a certain extent.

Optionally, the camera module further comprises a control chip; the control chip is electrically connected with the shape memory alloy wire 4 and is used for supplying power to the shape memory alloy wire 4 or stopping supplying power to control the shape memory alloy wire 4 to contract or relax.

In this embodiment, the control chip is electrically connected to the shape memory alloy wire 4, and the control chip can supply or stop supplying power to the shape memory alloy wire 4, so as to realize power on or power off of the shape memory alloy wire 4, where the shape memory alloy wire 4 contracts in a direction close to the center of the adjustment section 21 when the shape memory alloy wire 4 is powered on, and where the shape memory alloy wire 4 relaxes in a direction away from the center of the adjustment section 21 when the shape memory alloy wire 4 is powered off, so as to deform the adjustment section 21.

Optionally, referring to fig. 3, the shape memory alloy wires 4 are a plurality of, and the plurality of shape memory alloy wires 4 are uniformly arranged on the outer wall of the adjusting section 21.

In this embodiment, a plurality of shape memory alloy wires 4 are wound on the outer wall of the adjusting section 21, the plurality of shape memory alloy wires 4 are uniformly distributed on the outer wall of the adjusting section 21, as shown in fig. 3, which shows an embodiment in which seven shape memory alloy wires 4 are wound on the outer wall of the adjusting section 21, the seven shape memory alloy wires 4 are numbered and sequentially recorded as a-g, the shape memory alloy wire 4 with the number a is positioned at one side close to the lower part of the lens 3, the shape memory alloy wire 4 with the number g is positioned at one side close to the upper part of the lens 3, and in the process of driving the lens 3 to move upwards along the axial direction of the elastic sleeve 2, the control chip firstly energizes the shape memory alloy wire 4 with the number a to shrink and squeeze the adjusting section 21, the inner wall of the adjusting section 21 applies upward component force to the lens 3, and pushes the lens 3 to move upwards for a certain distance. Then the control chip cuts off the power of the shape memory alloy wire 4 with the number a, and the shape memory alloy wire 4 with the number b is electrified, the adjusting section 21 is contracted and extruded, the inner wall of the adjusting section 21 continuously applies upward component force to the lens 3, and the lens 3 is pushed to move upwards for a certain distance. By analogy, the shape memory alloy wire 4 numbered abc can generate upward component force for the lens when contracted so as to push the lens to move upwards along the axial direction of the elastic sleeve 2; the shape memory alloy wire 4 with the number efg can generate downward component force for the lens when contracting so as to push the lens to move downwards along the axial direction of the elastic sleeve 2; the shape memory alloy wire 4 with the number d is positioned at the maximum outer diameter of the adjusting section 21, and the tangent line of the outer wall of the adjusting section 21 is parallel to the axial direction of the elastic sleeve 2, so that an axial component force can not be generated for the lens during shrinkage, the lens is not pushed to perform axial movement, and a transitional effect can be achieved. The number of the shape memory alloy wires 4 can be freely set by those skilled in the art according to actual needs, and this embodiment is not limited.

Optionally, the plurality of shape memory alloy wires 4 is divided into at least two wire groups, each wire group comprising at least two shape memory alloy wires 4; each wire group is electrically connected with the control chip, and the current of the shape memory alloy wires 4 in each wire group is the same.

In the present embodiment, the plurality of shape memory alloy wires 4 are divided into at least two wire groups, each wire group including at least two shape memory alloy wires 4, and if the shape memory alloy wires 4 are four, they may be divided into two wire groups, each wire group including two shape memory alloy wires 4; if the shape memory alloy wires 4 are six, they may be divided into two wire groups, each wire group including three shape memory alloy wires 4, or three wire groups, each wire group including two shape memory alloy wires 4; the present embodiment is not limited to a specific number of wire sets and the number of wire sets. Each wire group is electrically connected with the control chip respectively, and the current of the shape memory alloy wires 4 in each wire group is the same, namely, the control chip can drive two or more shape memory alloy wires 4 to shrink at one time, thereby being beneficial to accelerating the movement speed of the lens 3 and improving the stability of the lens 3 in the movement process.

Optionally, referring to fig. 2, the elastic sleeve 2 further includes a limiting section 22, where the limiting section 22 is disposed at two opposite ends of the adjusting section 21 and is fixedly connected with the housing 1; the outer diameter of the limiting section 22 is larger than the outer diameter of the adjusting section 21.

In this embodiment, the elastic sleeve 2 further includes a limiting section 22, the limiting section 22 is disposed at two opposite ends of the adjusting section 21 and is fixedly connected with the housing 1, the limiting section 22 can be fixedly connected with the housing 1 by gluing, or can be fixedly connected together by penetrating a mounting hole with a fastener, which is not limited in this embodiment. The limiting section 22 is fixedly connected with the shell 1, so that the phenomenon that the elastic sleeve 2 is separated from the shell 1 in the process of moving the lens 3 in the elastic sleeve 2 can be avoided, and the reliability of the camera module is improved. The external diameter of spacing section 22 is greater than the external diameter of regulating section 21, and shape memory alloy wire 4 is around locating on the outer wall of regulating section 21, and the outer wall of spacing section 22 can play the limiting displacement to the both ends of shape memory alloy wire 4, avoids shape memory alloy wire 4 to appear shifting the phenomenon under the condition of long-term shrink or diastole, and then guarantees the precision that drive lens 3 carries out axial motion.

Alternatively, referring to fig. 2, the lens 3 includes a movable portion 31, the movable portion 31 protrudes from an outer wall of the lens 3 relatively, and an inner wall of the adjusting section 21 is matched with the outer wall of the movable portion 31 in an arc surface; the axial dimension of the movable portion 31 is less than or equal to two-thirds of the axial dimension of the adjustment section 21.

In this embodiment, the lens 3 has a structure with a thin upper portion and a thick lower portion, the movable portion 31 is disposed at the lower portion of the lens 3 and protrudes out of the outer wall of the lens 3 relatively, the inner wall of the adjusting section 21 and the outer wall of the movable portion 31 are in arc surface fit, and the movable portion 31 is more convenient for positioning the mounting position of the lens 3 in the elastic sleeve 2, so as to realize accurate mounting of the lens 3. The axial dimension of the movable part 31 is less than or equal to two thirds of the axial dimension of the adjusting section 21, so that the lens 3 has sufficient axial movement space in the adjusting section 21, and the focal length adjusting requirement of the lens 3 is met.

Optionally, referring to fig. 2, the camera module further includes a magnetic member 5 and a hall element 6; the magnetic piece 5 is connected with the lens 3 and moves synchronously with the lens 3; the Hall element 6 is fixed in the shell 1 and is electrically connected with the control chip; the Hall element 6 is used for detecting the magnetic field change of the magnetic piece 5 and feeding back the magnetic field change to the control chip; the control chip is used for supplying power to the shape memory alloy wire 4 or stopping supplying power according to the magnetic field change.

In this embodiment, the magnetic member 5 and the hall element 6 are used for detecting the movement position of the lens 3, specifically, the magnetic member 5 is fixedly connected with the lens 3, and the magnetic member 5 is driven to move synchronously during the movement of the lens 3 along the axial direction of the elastic sleeve 2. The hall element 6 is fixed in the housing 1, and the magnetism of the magnetic member 5 detected by the hall element 6 changes during the movement of the magnetic member 5. When the hall element 6 is mounted, the hall element 6 may be mounted at a position of the adjustment section 21 near the upper portion of the lens 3, i.e., at an extreme position of the movement of the lens 3, to more accurately detect the movement position of the lens 3. The Hall element 6 is electrically connected with the control chip, the Hall element 6 can feed back the detected magnetic field change to the control chip, the control chip can analyze and process the magnetic field change, and power is supplied to the shape memory alloy wire 4 or stopped according to the analysis and processing result. Illustratively, in the case of initial movement of the lens 3, the distance between the magnetic member 5 and the hall element 6 is relatively long, the change of the magnetic field detected by the hall element 6 is relatively small, and the control chip determines that the lens 3 is starting to move according to the change range of the magnetic field, and is a certain distance from the target position, so that power is continuously supplied to the next shape memory alloy wire 4, and the lens 3 is continuously moved. When the lens 3 moves to a position close to the target, the distance between the magnetic piece 5 and the hall element 6 is relatively short, the magnetic field detected by the hall element 6 is relatively large, and the control chip judges that the lens 3 is about to move in place according to the magnetic field change range, so that the next shape memory alloy wire 4 is not supplied with power any more, and the lens 3 stops moving.

Optionally, referring to fig. 2, a mounting groove 32 is formed on the outer wall of the lens 3, and the magnetic member 5 is fixed in the mounting groove 32.

In this embodiment, the lens 3 includes a protective housing and a lens disposed in the protective housing, the outer wall of the lens 3 refers to the outer wall of the protective housing, the outer wall of the protective housing is provided with a mounting groove 32, and the magnetic member 5 is embedded or clamped in the mounting groove 32 to achieve relative fixation with the mounting groove 32. The magnetic part 5 moves synchronously with the lens 3 in the mounting groove 32, so that the phenomenon that the magnetic part 5 is misplaced or falls off in the moving process can be avoided, the detection precision of the Hall element 6 is ensured, and the moving precision of the lens 3 is further improved.

In a further embodiment, the camera module further comprises a flexible circuit board (Flexible Printed Circuit, FPC) which is a printed circuit board made of polyimide or polyester film as a base material and has the characteristics of high reliability, high wiring density, light weight, thin thickness and good bending property, the flexible circuit board is fixed inside the shell 1 in a dispensing mode, electronic devices such as a control chip, a hall element 6 and the like can be welded on the flexible circuit board, various integrated circuits are arranged on the flexible circuit board, a control center of the camera module is formed, and electric connection between the control chip and the hall element 6 and electric connection between the control chip and other electronic devices on the board are realized through the integrated circuits, so that reliable operation of the camera module is realized.

On the basis, as shown in fig. 2, the camera module further comprises a base 7, a digital signal processor, an image signal processor and an image sensor 8, wherein the base 7 is fixedly connected with the shell 1, and the digital signal processor, the image signal processor and the image sensor 8 are electrically connected with the flexible circuit board. The Digital Signal Processor (DSP) is used for processing digital signals, and can take pictures, display back, record video, play back, etc., and the digital signal processor in this embodiment can calculate the image distance of the lens through the object distance information and the lens parameters, that is, the specific position of the axial movement of the lens in the elastic sleeve 2; an Image Signal Processor (ISP) for processing the image signal, for processing the output data of the image sensor 8, such as automatic exposure control, automatic gain control, automatic white balance, color correction, removal of dead pixels, etc.; the image Sensor 8 (Sensor) is a semiconductor chip, and has several millions to several tens of millions of photodiodes on its surface, which generate charges when illuminated, and convert light into electrical signals, and the performance of the Sensor will directly affect the photographing and image capturing performance of the camera module. Of course, still include light filter 9, conductive cloth, connector etc. in the camera module, light filter 9 includes an infrared cut-off or absorption light filter and a full light transmission spectrum light filter, and when light in daytime was abundant, infrared cut-off light filter worked, and true color was reduced, and when night visible light was not enough, full light transmission spectrum light filter worked, increased the light inlet quantity, improved night vision effect.

The embodiment of the application also provides electronic equipment, which comprises the camera module.

In this embodiment, the electronic device includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, and the like, and the electronic device includes the camera module in the foregoing embodiment, where the camera module combines the characteristics of the shape memory alloy wire with the cambered surface structures of the lens and the elastic sleeve, so as to achieve automatic focusing of the lens. Compared with the traditional camera module, the structure is simplified, the miniaturization and the light design of the camera module are realized, the space occupied by the camera module in the electronic equipment is saved, the design difficulty of the electronic equipment is reduced, and the weight of the electronic equipment is also reduced. Meanwhile, the power consumption in the working process of the camera module is low, so that the electric quantity of the electronic equipment is saved, and the cruising ability of the battery is improved.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. The camera module is characterized by comprising a shell, an elastic sleeve, a lens and a shape memory alloy wire;

2. The camera module of claim 1, wherein the outer wall of the adjustment section is a cambered surface, and a center of curvature of the cambered surface is located in the elastic sleeve.

3. The camera module of claim 1, further comprising a control chip;

the control chip is electrically connected with the shape memory alloy wire and is used for supplying power to the shape memory alloy wire or stopping supplying power to control the shape memory alloy wire to contract or relax.

4. A camera module according to claim 3, wherein the plurality of shape memory alloy wires are uniformly distributed on the outer wall of the adjustment section.

5. The camera module of claim 4, wherein the plurality of shape memory alloy wires are divided into at least two wire sets, each wire set comprising at least two shape memory alloy wires;

each wire group is electrically connected with the control chip, and the current of the shape memory alloy wires in each wire group is the same.

6. The camera module of claim 1, wherein the elastic sleeve further comprises a limiting section, the limiting section being disposed at opposite ends of the adjustment section and fixedly connected with the housing;

the outer diameter of the limiting section is larger than that of the adjusting section.

7. The camera module according to claim 1, wherein the lens comprises a movable portion, the movable portion protrudes out of the outer wall of the lens relatively, and the inner wall of the adjusting section is in cambered surface fit with the outer wall of the movable portion;

the axial dimension of the movable part is less than or equal to two thirds of the axial dimension of the adjusting section.

8. The camera module of claim 3, wherein the camera module further comprises a magnetic member and a hall element;

the magnetic piece is connected with the lens and moves synchronously with the lens;

the Hall element is fixed in the shell and is electrically connected with the control chip;

the Hall element is used for detecting the magnetic field change of the magnetic piece and feeding back the magnetic field change to the control chip; the control chip is used for supplying power to the shape memory alloy wire or stopping supplying power according to the magnetic field change.

9. The camera module of claim 8, wherein the outer wall of the lens is provided with a mounting groove, and the magnetic member is fixed in the mounting groove.

10. An electronic device comprising the camera module of any one of claims 1 to 9.