CN218162632U - Focusing motor and camera module - Google Patents

Abstract

The application provides a focus motor and module of making a video recording, wherein, focus the motor and include electric capacity subassembly, stator part and active cell part. The first polar plate is arranged on the rotor component, and the second polar plate is arranged on the stator component; or the first polar plate is arranged on the stator component, and the second polar plate is arranged on the rotor component; the lens is arranged on the rotor component. The capacitor assembly comprises a first polar plate and a second polar plate; the first polar plate comprises a first plane wall, and the second polar plate comprises a second plane wall which is opposite to the first plane wall and arranged in an included angle manner; the orthographic projection of the second plane wall on the plane where the first plane wall is located is at least partially located on the first plane, and the area of the part is S; the shortest distance between the second plane wall and the first plane wall is D; the mover component drives the first pole plate and the second pole plate to perform relative movement in the moving direction of the mover component, wherein S is kept constant and D is continuously changed. The processing unit can accurately acquire the lens position information in real time by acquiring the capacitance change signal in real time.

Description

Focusing motor and camera module

Technical Field

The utility model belongs to the technical field of the shooting equipment technique and specifically relates to a focus motor and module of making a video recording are related to.

Background

A focus motor is generally used in a photographing apparatus, and drives a lens to move to focus the lens. In order to realize accurate and rapid focusing, a processing unit of a focusing motor needs to acquire position information of a lens in real time in the moving process of the lens, when the position information of the lens reaches a preset value, the focusing motor stops driving the lens to move, and the lens is located at a focusing position at the moment. The traditional focusing motor generally adopts a Hall sensor to acquire lens position information in real time, however, the Hall sensor has more parts and more complex structure, and thus, the assembly difficulty of the focusing motor can be increased.

In order to simplify the structure of the focus motor, some manufacturers have adopted relatively movable electrode plates as components for sensing the position of the lens, and the principle is as follows: in the relative movement process of the two electrode plates, the area opposite to the two electrode plates is continuously changed, so that the capacitance between the two electrode plates is continuously changed, and the capacitance change process corresponds to the lens position change process. By the method, the real-time position of the lens can be judged through the real-time capacitance value. However, in such a scheme, the change speed of the facing area of the two electrode plates is fast, which is not beneficial to accurately and effectively acquiring the lens position information. Therefore, it is necessary to provide a technical solution for a focus motor capable of accurately and effectively acquiring real-time lens position information.

SUMMERY OF THE UTILITY MODEL

The utility model provides a focus motor and module of making a video recording, it is necessary to provide one kind can acquire the focus motor technical scheme of camera lens real-time position information accurately effectively.

The utility model adopts the technical scheme as follows:

a focusing motor is applied to a camera module and comprises a capacitor assembly, a processing unit, a stator assembly, a rotor assembly and a driving assembly; the driving assembly drives the rotor component to do linear reciprocating motion relative to the stator component; the processing unit controls the driving assembly to work; the capacitor assembly comprises a first polar plate and a second polar plate which are oppositely arranged at intervals, and the first polar plate and the second polar plate are respectively and electrically connected with the processing unit; the first polar plate comprises a first plane wall, and the second polar plate comprises a second side wall which is opposite to the first plane wall and arranged in an included angle manner; the orthographic projection of the second side wall on the plane of the first plane wall is at least partially positioned on the first plane wall, and the area of the part is S; the shortest distance between the second side wall and the first plane wall is D; the first polar plate and the second polar plate can be driven by the mover component to perform relative movement in the moving direction of the mover component, wherein S is kept constant and D is continuously changed.

In an embodiment, the second side wall is parallel to a moving direction of the mover member; the length of the first planar wall in the moving direction of the mover member is larger than the length of the second planar wall in the moving direction of the mover member.

In one embodiment, the first pole plate is disposed on the mover portion, the second pole plate is disposed on the stator portion, and the mover portion drives the first pole plate to move relative to the second pole plate.

In one embodiment, the first pole plate is disposed on the stator component, the second pole plate is disposed on the mover component, and the mover component drives the second pole plate to move relative to the first pole plate.

In one embodiment, the second side wall is a second planar wall.

In one embodiment, the second side wall is a curved wall.

In one embodiment, the capacitor assembly is provided in a plurality, each capacitor assembly being disposed around the stator assembly.

A camera module comprises a shell, a lens and the focusing motor; the stator part is arranged in the shell, the rotor part is movably arranged in the shell, and the lens is arranged on the rotor part.

The utility model has the advantages that:

the capacitor assembly comprises a first pole plate and a second pole plate, wherein the first pole plate comprises a first plane wall, and the second pole plate comprises a second plane wall which is opposite to the first plane wall and arranged at an included angle. The orthographic projection of the second plane wall on the plane where the first plane wall is located is at least partially located on the first plane wall, and the area of the part is S. The second planar wall is spaced from the first planar wall by a distance D. The mover component drives the first pole plate and the second pole plate to move relatively in the moving direction of the mover component, wherein S is kept unchanged, and D is continuously changed. Since the mover member is used to carry the lens, the processing unit may finally acquire the position information of the lens in real time by acquiring the capacitance change signal in real time. Because the first plane wall and the second plane wall are arranged at the included angle, when the first plane wall and the second plane wall move relatively, the distance between the first plane wall and the second plane wall changes slowly, so that the capacitance change information between the first plane wall and the second plane wall can be more accurately and effectively acquired in real time, and the position information of the lens can be accurately and effectively acquired.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings, there is shown in the drawings,

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

fig. 2 is a schematic view of a combined structure of the camera module according to the embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a camera module according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of the camera module according to the embodiment of the present invention when the first electrode plate and the second electrode plate are not assembled;

fig. 5 is a schematic diagram of a position relationship between the first polar plate and the second polar plate according to the embodiment of the present invention;

fig. 6 is a schematic position diagram of the second planar wall forming a projection on the plane of the first planar wall according to the embodiment of the present invention;

fig. 7 is a schematic position diagram of the second planar wall forming a projection on the plane of the first planar wall according to the embodiment of the present invention;

fig. 8 is a schematic diagram of a position of the second planar wall forming a projection on the plane of the first planar wall according to the embodiment of the present invention;

fig. 9 is a schematic diagram of a position relationship of the first pole plate, the second pole plate, the motor carrier and the vertical plate according to the embodiment of the present invention.

Reference is made to the accompanying drawings in which:

10. a camera module;

20. a housing;

30. a lens;

41. a base plate; 411. a vertical plate; 4111. a second assembly groove; 412. connecting columns; 42. a motor carrier; 421. a first fitting groove; 43. a motor bracket; 44. an elastic sheet is arranged; 45. a lower elastic sheet;

50. a processing unit;

60. a magnet;

70. a first electrode plate; 71. a first planar wall;

80. a second polar plate; 81. a second planar wall.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

Referring to fig. 1, the present embodiment discloses a camera module 10, which can be used in a camera device, such as a mobile phone, an unmanned aerial vehicle, a single lens reflex camera, etc. The camera module 10 includes a housing 20, a lens 30, and a focus motor. The bottom side of the housing 20 is open, and the top side of the housing 20 is provided with a notch for mating with the lens 30.

Referring to fig. 2 and 3, the focusing motor includes a stator part, a mover part, a driving assembly, a capacitor assembly and a processing unit 50. The stator part is arranged in the shell 20, the rotor part is movably arranged in the shell 20, the driving assembly drives the rotor part to linearly reciprocate relative to the stator part, and particularly, the rotor part reciprocates in the direction F in the drawing; the lens 30 is provided to the mover member, and the movement of the lens 30 is driven by the mover member.

Specifically, the stator component includes a bottom plate 41, and two opposite sides of the bottom plate 41 are respectively provided with a vertical plate 411; the bottom plate 41 is fixed to the bottom side of the housing 20, and the vertical plates 411 are located in the housing 20. The mover member includes a motor support 43, a motor carrier 42, an upper spring 44, and a lower spring 45. The motor bracket 43 is disposed in the housing 20, four supporting legs distributed at four corners of the motor bracket 43 are disposed on a side of the motor bracket 43 close to the bottom plate 41, the supporting legs of the motor bracket 43 abut against the bottom plate 41, and a side surface of the motor bracket 43 opposite to the bottom plate 41 abuts against an inner wall of the notch of the housing 20. The motor carrier 42 is disposed in the housing 20, the upper side of the motor carrier 42 is connected to a side of the motor bracket 43 opposite to the notch through the upper elastic sheet 44, and the lower side of the motor carrier 42 is connected to the bottom plate 41 through the lower elastic sheet 45, wherein the upper side and the lower side of the motor carrier 42 refer to the upper side and the lower side of the direction F in fig. 2, that is, the side of the motor carrier 42 facing the bottom plate 41 is the lower side of the motor carrier 42, and the side of the motor carrier 42 opposite to the bottom plate 41 is the upper side of the motor carrier. Furthermore, a connection column 412 is disposed on one side of the bottom plate 41 facing the lower elastic sheet 35, a through hole (not shown) is disposed on the lower elastic sheet 45, and the connection column 412 penetrates through the through hole of the lower elastic sheet 45. The lower spring 45 is fixedly connected to the connecting column by riveting or bonding or other feasible connection methods. In this embodiment, the lower elastic sheet 45 forms a stator of the focusing motor, when the focusing motor works, the motor carrier 42 moves along the direction F, the motor carrier 42 drives the lower elastic sheet 45 to elastically deform, and when the focusing motor stops working, the elastic force of the lower elastic sheet 45 forces the motor carrier 42 to return to its original shape.

The driving assembly includes two magnets 60 respectively disposed on two opposite inner sidewalls of the housing 20 and a coil disposed on the motor carrier 42, and when the coil is energized, the magnet 60 can push the coil by magnetic force, so that the motor carrier 42 is pushed by the coil to reciprocate in a linear direction. Specifically, the coil urges the motor carrier 42 to reciprocate in the direction F in the drawing. The lens 30 is disposed on the motor carrier 42, and the lens 30 is driven by the motor carrier 42 to reciprocate along a straight line, thereby completing focusing of the lens 30.

In the present embodiment, the processing unit 50 is disposed outside one of the risers 411, the processing unit 50 may be an FPCB (Flexible Printed Circuit Board) processing unit 50, and the FPCB processing unit 50 is also called a Flexible Circuit Board processing unit 50, and the processor thereof is disposed on the Flexible Circuit Board. The FPCB processing unit 50 is adapted to a small space installation scene of the lens 30 module because it has flexibility. In other embodiments, the processing unit 50 may also be other microprocessor units. The processing unit 50 of the present embodiment can control the operation of the driving component, so that the driving component drives the motor carrier 42 to reciprocate along the straight line or the driving component stops driving the motor carrier 42.

In this embodiment, the number of the capacitor elements is one, and in other embodiments, the number of the capacitor elements may be multiple, for example, four, and four capacitor elements are disposed around the motor carrier 42 at equal intervals.

Referring to fig. 3, in the present embodiment, the capacitor assembly includes a first plate 70 and a second plate 80 disposed opposite to each other and spaced apart from each other. The first plate 70 and the second plate 80 are electrically connected to the processing unit 50, respectively, and when the first plate 70 and the second plate 80 are powered on, a capacitor (also called capacitance) is formed between the first plate 70 and the second plate 80, and the principle of forming the capacitor is the prior art, and thus will not be described herein. The first plate 70 is disposed on the mover, the second plate 80 is disposed on the stator, and the mover drives the first plate 70 to move relative to the second plate 80. In other embodiments (as shown in fig. 9), the first plate 70 may also be provided on the stator part and the second plate 80 on the mover part.

In the present embodiment, the first pole plate 70 is provided on the outer circumferential side wall of the motor carrier 42. The second plate 80 is disposed on one of the vertical plates 411, and the second plate 80 is opposite to and spaced apart from the first plate 70. Preferably, the second plate 80 is provided on the same vertical plate 411 as the processing unit 50, so that the structure of the focus motor is more compact. Of course, in other embodiments, the second plate 80 can be disposed at another vertical plate 411 or other positions in the housing 20.

Referring to fig. 4, fig. 4 shows the structure of the camera module 10 in fig. 3 when the first plate 70 and the second plate 80 are not assembled. In this embodiment, the motor carrier 42 has a first mounting groove 421 formed in an outer peripheral sidewall thereof, and the first pole plate 70 is mounted in the first mounting groove 421. The vertical plate 411 is formed with a second fitting groove 4111, and the second pole plate 80 is fitted in the second fitting groove 4111. Preferably, the first assembling groove 421 is obliquely arranged with a groove wall opposite to its own groove opening, and when the first pole plate 70 is assembled to the first assembling groove 421, the first pole plate 70 is also obliquely arranged. Of course, in other embodiments, the first plate 70 and the second plate 80 may be mounted in other manners.

In the prior art, the two electrode plates of the capacitor assembly with a part of the lens 30 module are mounted on other plates in a welding or bonding mode, and when the two electrode plates are mounted, the position relation and the angle relation of the two electrode plates need to be adjusted, so that the mounting process is complex. In the assembly process of the present embodiment, only the first pole plate 70 and the second pole plate 80 need to be respectively embedded in the first assembling groove 421 and the second assembling groove 4111, and the position relationship and the angle relationship between the first pole plate 70 and the second pole plate 80 are respectively defined by the first assembling groove 421 and the second assembling groove 4111, so that the position relationship and the angle relationship between the first pole plate 70 and the second pole plate 80 do not need to be adjusted, and thus, the assembly process of the first pole plate 70 and the second pole plate 80 can be simple and fast.

Referring to fig. 3, in the present embodiment, the first plate 70 includes a first planar wall 71, and the second plate 80 includes a second sidewall disposed opposite to and at an angle with respect to the first planar wall 71, specifically, the first planar wall 71 is formed on a side of the first plate 70 close to the second plate 80, and the second sidewall is formed on a side of the second plate 80 close to the first plate 70.

Wherein the second side wall is a second planar wall 81. The orthographic projection of the second planar wall 81 on the plane of the first planar wall 71 is at least partially on the first planar wall 71, and the area of the part is S. Referring to fig. 5 and fig. 6, fig. 5 shows the relative positions of the first planar wall 71 and the second planar wall 81, and shows the principle that the second planar wall 81 forms an orthographic projection on the plane of the first planar wall 71; fig. 6 shows the positional relationship between the first planar wall 71 and the orthographic projection of the second planar wall 81 on the plane of the first planar wall 71. The orthographic projection in the embodiment refers to a projection formed by irradiating the second planar wall 81 with light from the direction E perpendicular to the second planar wall 81. The orthographic projection of the second planar wall 81 on the plane of the first planar wall 71 is located on the first planar wall 71, that is, the area of the orthographic projection of the second planar wall 81 on the plane of the first planar wall 71 is S, the orthographic projection corresponds to the position a in the figure, and the area of the position a is kept unchanged when the first planar wall 71 and the second planar wall 81 move relatively along the direction F in the figure.

In another embodiment (not shown), the second side wall may be a curved wall, so long as an orthographic projection of the curved wall on the plane of the first planar wall 71 is at least partially located on the first planar wall 71, the area of the portion is S, and the area of S may be kept unchanged when the curved wall and the first planar wall 71 move relatively along the direction F.

Illustratively, in other embodiments, referring to fig. 5 and 7, the middle portion of the orthographic projection of the second planar wall 81 on the plane of the first planar wall 71 is located on the first planar wall 71, and the middle portion corresponds to the portion B in fig. 7. When the first planar wall 71 and the second planar wall 81 are relatively moved in the direction F2 in the figure, the area of the B portion remains unchanged. Referring to fig. 8, in another embodiment, the second planar wall 81 is located on one side of the orthogonal projection formed by the plane of the first planar wall 71, where the first planar wall 71 overlaps, where the side is the portion C in fig. 7, and when the first planar wall 71 and the second planar wall 81 move relatively along the direction F3 in the figure, the area of the portion C remains unchanged. Of course, there are other embodiments that are also suitable for the present application, and are not intended to be exhaustive.

With continued reference to fig. 5, the distance between the second planar wall 81 and the first planar wall 71 is D, wherein the distance between the first planar wall 71 and the second planar wall 81 refers to the shortest distance between the first planar wall 71 and the second planar wall 81; for example, the lowermost side of the second planar wall 81 is a measurement reference point, and the shortest distance between the lowermost side of the second planar wall 81 and the first planar wall 71 is D.

In this embodiment, the first plate 70 and the second plate 80 can be driven by the mover component to move relatively in the moving direction of the mover component while keeping S constant and D continuously changing. Specifically, during the relative movement of the first polar plate 70 and the second polar plate 80, the included angle between the first planar wall 71 and the second planar wall 81 is always kept unchanged, so that S is kept unchanged. During the relative movement of the first plate 70 and the second plate 80, because S remains unchanged, the variation process D corresponds to the variation process of the capacitance between the first plate 70 and the second plate 80, the variation process of the capacitance corresponds to the movement process of the mover member, and different capacitances correspond to different positions of the mover member, so that the processing unit 50 obtains real-time position information of the mover member according to the variation of the capacitance between the first plate 70 and the second plate 80. Specifically, the capacitance is calculated as C = ε S/4 π kD. Where ε is the dielectric constant, S is the area of the second planar wall 81 that forms the forward projection on the first planar wall 71, D is the distance between the first planar wall 71 and the second planar wall 81, and k is the constant of the electrostatic force. When the first planar wall 71 and the second planar wall 81 move relatively, the value of S remains the same, and the value of D changes continuously, so that the value of C changes adaptively according to the relative movement of the first planar wall 71 and the second planar wall 81. When the mover member is moved to the predetermined position, the first and second planar walls 71 and 81 are in the predetermined relative position, and the capacitance between the first and second plates 70 and 80 is also in the predetermined value. In the focusing process, the processing unit 50 collects the capacitance (i.e. C value) between the first pole plate 70 and the second pole plate 80 in real time, and when the capacitance between the first pole plate 70 and the second pole plate 80 reaches a preset value, the processing unit 50 controls the driving assembly to stop driving the mover component, so that the mover component stays at the preset position, and the lens 30 carried by the mover component is also at the focusing position.

Because the first planar wall 71 and the second planar wall 81 of the present application are arranged at an included angle, when the first planar wall 71 and the second planar wall 81 move relatively, the distance between the first planar wall 71 and the second planar wall 81 changes relatively slowly, which is beneficial to more accurately and effectively acquiring the capacitance change information between the first planar wall 71 and the second planar wall 81 in real time, thereby accurately and effectively acquiring the position information of the lens.

With continued reference to fig. 3, the cross-sectional shape of the first plate 70 may be trapezoidal, triangular, rectangular, parallelogram, etc., and the shape and structure of the first plate 70 are not limited as long as the surface thereof can form the first planar wall 71, and the second plate 80 can form the second planar wall 81. For example, in the present embodiment, the first plate 70 has a parallelogram shape in a cross-section along the moving direction of the mover member, and the second plate 80 has a rectangular shape in a cross-section along the moving direction of the mover member.

In order to keep the included angle between the first planar wall 71 and the second planar wall 81 constant and keep the distance D between the first planar wall 71 and the second planar wall 81 constant during the relative movement of the first polar plate 70 and the second polar plate 80, the following solutions are adopted in the present embodiment:

referring to fig. 3, in the present embodiment, the motor carrier 42 can move back and forth in the direction F in fig. 3, and the moving direction of the mover component is the same as the moving direction of the motor carrier 42. The second planar wall 81 is parallel to the moving direction of the mover member, which is the F direction. The length of the first planar wall 71 in the mover member moving direction is larger than the length of the second planar wall 81 in the mover member moving direction. Specifically, the first planar wall 71 spans a distance in the moving direction of the mover member that is larger than the distance that the second planar wall 81 spans in the moving direction of the mover member. The first planar wall 71 spans a distance L1 in the F direction, the second planar wall 81 spans a distance L2 in the F direction, and L1 is greater than L2. In practical applications, as long as the distance of relative movement between the second planar wall 81 and the first planar wall 71 in the F direction is within the range of the value L1, the area of the portion a can be kept unchanged during the relative movement between the second planar wall 81 and the first planar wall 71 in the F direction. With this structure, the second planar wall 81 and the first planar wall 71 can have a sufficient moving distance, so that the capacitance variation range between the first electrode plate 79 and the second electrode plate 80 is sufficiently wide.

Further, the second planar wall 81 is parallel to the moving direction of the motor carrier 42, the first planar wall 71 is inclined from top to bottom toward the second planar wall 81, in other embodiments, the first planar wall 71 may also be inclined from bottom to top toward the second planar wall 81; when the first pole plate 70 moves from bottom to top, the distance D between the first plane wall 71 and the second plane wall 81 is gradually reduced, and when the first pole plate 70 moves from top to bottom, the distance D between the first plane wall 71 and the second plane wall 81 is gradually increased; in the above process, the capacitance formed between the first plate 70 and the second plate 80 can be adaptively changed according to the change D, and the processing unit 50 continuously collects the capacitance signal between the first plate 70 and the second plate 80 and controls the operation of the driving assembly according to the capacitance signal. In other embodiments, the second planar wall 81 may also be disposed at an angle with respect to the moving direction of the mover member, as long as the angle between the first planar wall 71 and the second planar wall 81 can be maintained during the relative movement of the first plate 70 and the second plate 80, that is, the value of the angle a in fig. 5 is maintained.

In the prior art, the two plates of the capacitor assembly are parallel to each other, and when the focusing motor drives the lens, one of the plates moves together with the lens, while the other plate remains stationary, so that the two plates move relatively. In one scheme, the relative movement direction of the two polar plates is parallel to the plate surface direction of the polar plates, so that the capacitance of the two polar plates is changed by keeping the distance of the two polar plates unchanged and changing the opposite area of the two polar plates. In another scheme, the relative movement direction of the two-pole plate can also be a direction vertical to the plate surface of the two-pole plate, so that the capacitance of the two-pole plate is changed by keeping the facing area of the two-pole plate unchanged and changing the distance between the two-pole plate. However, in the prior art, no matter which of the foregoing manners is adopted, the moving speed of the electrode plate is consistent with the moving speed of the lens, so that the two-electrode capacitance change is fast due to the fast change of the electrode plate speed, which is not beneficial for the processing unit to acquire the capacitance signal.

Compared with the prior art, the first polar plate 70 and the second polar plate 80 of the embodiment are arranged in a non-parallel manner, and the first planar wall 71 and the second planar wall 81 are arranged at an included angle; when the motor carrier 42 drives the lens 30 to move, the motor carrier 42 also drives the first polar plate 70 to move, and the second polar plate 80 remains stationary, so that the first polar plate 70 and the second polar plate 80 can move relatively; in the process of relative movement of the first pole plate 70 and the second pole plate 80, the moving direction of the mover component is parallel to the second planar wall 81, the first planar wall 71 and the second planar wall 81 are arranged at an included angle, and the distance spanned by the first planar wall 71 in the moving direction of the mover component is greater than the distance spanned by the second planar wall 81 in the moving direction of the mover component; based on the foregoing structural features, the speed of the distance between the first planar wall 71 and the second planar wall 81 is smaller than the moving speed of the first electrode plate 70, that is, smaller than the moving speed of the lens 30, so that the speed of the distance between the first planar wall 71 and the second planar wall 81 is relatively gentle, and thus the capacitance changes of the first electrode plate 70 and the second electrode plate 80 are also gentle, which is convenient for the processing unit 50 to collect the capacitance change signal and process the capacitance change signal, thereby improving the accuracy of the processes of collecting the capacitance change signal, processing the capacitance change signal, and controlling the driving component according to the capacitance change signal by the processing unit 50 to a certain extent.

As long as the idea created by the present invention is not violated, various different embodiments of the present invention can be arbitrarily combined, and all the embodiments should be regarded as the content disclosed by the present invention; the utility model discloses an in the technical concept scope, what carry out multiple simple variant and different embodiments to technical scheme goes on does not violate the utility model discloses the arbitrary combination of the thought of creation all should be within the scope of protection of the utility model.

Claims (10)

1. The utility model provides a focus motor, its is applied to the module of making a video recording which characterized in that: the device comprises a capacitor assembly, a processing unit, a stator assembly, a rotor assembly and a driving assembly; the driving assembly drives the rotor component to do linear reciprocating motion relative to the stator component; the processing unit controls the driving component to work; the capacitor assembly comprises a first polar plate and a second polar plate which are opposite and arranged at intervals, and the first polar plate and the second polar plate are respectively and electrically connected with the processing unit;

the first polar plate comprises a first plane wall, and the second polar plate comprises a second side wall which is opposite to the first plane wall and arranged in an included angle manner; the orthographic projection of the second side wall on the plane of the first plane wall is at least partially positioned on the first plane wall, and the area of the part is S; the shortest distance between the second side wall and the first plane wall is D; the first polar plate is arranged on the rotor part, and the second polar plate is arranged on the stator part; or the first polar plate is arranged on the stator component, and the second polar plate is arranged on the rotor component; the first polar plate and the second polar plate can be driven by the rotor component to perform relative movement in the moving direction of the rotor component, wherein S is kept unchanged and D is continuously changed.

2. The focus motor of claim 1, wherein a length of the first planar wall in a moving direction of the mover member is greater than a length of the second sidewall in the moving direction of the mover member.

3. The focus motor of claim 1, wherein said second side wall is a second planar wall.

4. The focus motor of claim 1, wherein said second side wall is a curved wall.

5. The focus motor of claim 1, wherein the capacitor assembly is provided in plural numbers, each capacitor assembly being disposed around the stator part.

6. The focus motor of claim 5, wherein the number of the capacitor assemblies is four, and four of the capacitor assemblies are disposed around the mover member at equal intervals.

7. The focus motor of claim 1, wherein said camera module comprises a housing; the rotor component is arranged in the shell; the stator component includes a base plate; the base plate is connected to the shell and positioned below the rotor component; the rotor component comprises a motor carrier, an upper elastic sheet and a lower elastic sheet; the upper side of the motor carrier is connected to the shell through the upper elastic sheet; the lower side of the motor carrier is connected to the bottom plate through the lower elastic sheet.

8. The focusing motor of claim 7, wherein a connecting post is disposed on a side of the bottom plate facing the lower elastic piece, and the connecting post protrudes from a surface of the bottom plate toward the lower elastic piece; the lower elastic sheet is fixedly connected with the connecting column.

9. The focus motor of claim 7, wherein the camera module comprises a housing; the driving assembly comprises two magnets respectively arranged on two inner side walls of the shell and a coil arranged on the motor carrier.

10. A camera module comprising a housing, a lens, and a focus motor according to any one of claims 1 to 9; the stator part is arranged in the shell, the rotor part is movably arranged in the shell, and the lens is arranged on the rotor part.

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