CN115514861B - Driving device, camera module and electronic equipment - Google Patents

Abstract

Drive arrangement, camera module and electronic equipment, drive arrangement is used for the camera module, includes: magnetic force generating means and driving force transmitting means, wherein: the magnetic force generating device is used for generating driving force to drive the driving force transmission device to rotate; the driving force transmission device is used for converting the rotation motion of the driving force transmission device into linear motion along the optical axis direction so as to drive the lens component of the camera module to realize focusing. The scheme can provide a novel driving device and a camera module.

Description

Driving device, camera module and electronic equipment

Technical Field

The embodiment of the invention relates to the technical field of camera modules, in particular to a driving device, a camera module and electronic equipment.

Background

With the rapid development of smart phones, the camera modules of the smart phones are increasingly miniaturized, have low power consumption, low cost and high image quality, and are thus widely applied to various new-generation portable camera devices. In the auto-focusing process, the camera module generally needs to use a driving device to drive the lens assembly to move in the optical axis direction. However, the current driving device is not ideal when driving the lens assembly to focus.

Disclosure of Invention

One of the objectives of the embodiments of the present invention is to provide a novel driving device and a camera module.

In order to solve the above technical problems, an embodiment of the present invention provides a driving device for a camera module, including: magnetic force generating means and driving force transmitting means, wherein: the magnetic force generating device is used for generating driving force to drive the driving force transmission device to rotate; the driving force transmission device is used for converting the rotation motion of the driving force transmission device into linear motion along the optical axis direction so as to drive the lens component of the camera module to realize focusing.

Optionally, the magnetic force generating device includes: the magnetic force generating device is coupled with the driving force transmitting device through the first magnetic body and the second magnetic body.

Optionally, an included angle between the magnetic pole direction of the first magnetic body and the magnetic pole direction of the second magnetic body is 90 degrees.

Optionally, the first electromagnetic unit and the second electromagnetic unit each include an iron core and a coil wound around the iron core.

Optionally, the included angle between the length extension directions of the two iron cores is 90 degrees.

Optionally, a first accommodating cavity is arranged at one end of the iron core of the first electromagnetic unit, and the first accommodating cavity is used for accommodating the first magnetic body; one end of the iron core of the second electromagnetic unit is provided with a second accommodating cavity, the second accommodating cavity is used for accommodating the second magnetic body, and the first accommodating cavity and the second accommodating cavity are arranged oppositely.

Optionally, the driving force transmission device includes: turbine and worm, wherein: the first end of the worm is connected with the first magnetic body, the second end of the worm is connected with the second magnetic body, and the worm is used for driving the turbine to rotate; the turbine is coupled to the lens assembly.

Optionally, the first magnetic body and the second magnetic body are both cylindrical, the first magnetic body is sleeved at the first end of the worm, and the second magnetic body is sleeved at the second end of the worm.

Optionally, the driving device further includes: and the control unit is used for controlling the current directions input to the first electromagnetic unit and the second electromagnetic unit so as to change the magnetic pole directions of the first electromagnetic unit and the second electromagnetic unit.

The embodiment of the invention also provides a camera module, which comprises: the lens module is used for driving the lens module to move along the optical axis direction in the focusing process of the camera module.

Optionally, the camera module further includes a base, where the base is used to bear the driving component.

Optionally, when the driving force transmission device includes a worm wheel and a worm, the camera module further includes a first positioning unit for restricting movement of the worm wheel in a radial direction thereof when the worm wheel rotates around the optical axis direction.

Optionally, the first positioning unit includes: the device comprises M first placing grooves, N first balls and first positioning grooves, wherein the M first placing grooves are circumferentially arranged on one side, facing the turbine, of the base; the first positioning groove is circumferentially arranged on one side of the turbine, which faces the base; one part of each first ball is positioned in the first placing groove, the other part of each first ball is positioned in the first positioning groove, M is more than or equal to 3, N is more than or equal to 3, M is more than or equal to N, and M and N are positive integers.

Optionally, the lens assembly includes a lens barrel and a lens disposed on the lens barrel, and when the driving force transmission device includes a turbine and a worm, the lens barrel is connected to the turbine and is rotatable relative to the turbine.

Optionally, the camera module further includes a housing, the housing is connected with the base and forms a receiving cavity, the driving assembly and the lens assembly are located in the receiving cavity, and an opening for exposing the lens assembly is formed in the housing.

Optionally, the camera module still includes spacing subassembly, spacing subassembly includes first spacing portion and second spacing portion, first spacing portion set up in the lens cone, second spacing portion set up in the casing, first spacing portion with the cooperation of second spacing portion is in order to restrict the lens cone is rotatory relative the casing.

Optionally, the camera module further comprises a dustproof film assembly, and the dustproof film assembly coats the outer surface of the lens assembly.

Optionally, the dustproof membrane assembly includes: the dustproof cover plate is connected with the cover plate and the lens protection structure respectively.

Optionally, the camera module further includes a second positioning unit, where the second positioning unit is configured to limit movement of the lens assembly in a radial direction of the lens assembly when the lens assembly moves in the optical axis direction.

Optionally, the second positioning unit includes: the P second placing grooves are circumferentially arranged at one side of the cover plate, which faces the turbine, at intervals, and are used for placing the second balls; the second positioning groove is circumferentially arranged on one side, far away from the base, of the turbine; one part of each second ball is positioned in the second placing groove, the other part of each second ball is positioned in the second positioning groove, P is more than or equal to 3, Q is more than or equal to 3, P is more than or equal to Q, and P and Q are positive integers.

Optionally, the second placement groove does not penetrate the cover plate.

Optionally, the lens barrel is provided with an external thread, the turbine is provided with an internal thread, and the external thread is adapted to the internal thread.

Optionally, the lens barrel is provided with a support column, the inner wall of the turbine is provided with a clamping groove, the support column is clamped in the clamping groove, and the clamping groove is in a spiral shape; or, the inner wall of the turbine is provided with a support column, the lens barrel is provided with a clamping groove, the support column is clamped in the clamping groove, and the clamping groove is spiral.

Optionally, the two positions of the support column are tangent to the clamping groove.

Optionally, the base is provided with a mounting portion, and the mounting portion is used for placing the driving assembly.

Optionally, the shape of the mounting portion is adapted to the shape of the outer surface of the drive assembly.

Optionally, when the driving force transmission device includes a worm wheel and a worm, the mounting portion includes a supporting portion for supporting the worm.

Optionally, the camera module further comprises a position feedback system, and the position feedback system is used for detecting the movement displacement of the lens assembly.

The embodiment of the invention also provides electronic equipment, which comprises the driving device or the camera module.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

the embodiment of the invention provides a driving device which can be used for focusing of a camera module, in particular to the driving device which can comprise a magnetic force generating device and a driving force transmission device, wherein the magnetic force generating device can generate driving force, the driving force can drive the driving force transmission device to rotate, and the driving force transmission device can convert the rotation motion of the driving force transmission device into linear motion along the optical axis direction so as to drive a lens assembly of the camera module to realize focusing. The driving device is used for the camera module to realize large-driving-force long-stroke optical zooming of the camera module, and performance of the camera module in zooming is improved.

Drawings

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

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic view of a portion of a camera module according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a driving device according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a driving force transmission device in an embodiment of the invention;

FIG. 6 is a schematic diagram showing the relative positions of a worm and a first magnetic body and a second magnetic body according to an embodiment of the present invention;

fig. 7 is a schematic partial structure of a camera module according to an embodiment of the invention.

Detailed Description

As described above, with the rapid development of smart phones, the camera modules of the phones are increasingly miniaturized, low power consumption, low cost, and high image quality, and thus are widely used in various new-generation portable image pickup apparatuses. In the auto-focusing process, the camera module generally needs to use a driving device to drive the lens assembly to move in the optical axis direction. However, the current driving device is not ideal when driving the lens assembly to focus.

In order to solve the above-mentioned problems, in an embodiment of the present invention, a driving device is provided, which may be used for focusing of a camera module, and in particular, the driving device may include a magnetic force generating device and a driving force transmitting device, which may generate a driving force for driving rotation of the driving force transmitting device. The driving force transmission device can convert the rotation motion of the driving force transmission device into linear motion along the optical axis direction so as to drive the lens component of the camera module to realize focusing. The driving device is used for the camera module to realize large-driving-force long-stroke optical zooming of the camera module, and performance of the camera module in zooming is improved.

In order to make the above objects, features and advantages of the embodiments of the present invention more comprehensible, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.

Referring to fig. 1, a schematic structural diagram of a camera module according to an embodiment of the present invention is provided. Fig. 2 is an exploded view of fig. 1. Fig. 3 is a schematic diagram of a part of a camera module according to an embodiment of the invention. Fig. 4 is a schematic structural view of a driving device according to an embodiment of the present invention. Referring to fig. 5, a schematic structural view of a driving force transmission device in an embodiment of the present invention is given. An embodiment of the present invention provides a driving device, and a specific structure of the driving device is described below with reference to fig. 1 to 5.

The driving device 1 provided by the embodiment of the invention can be used for the camera module 100. Specifically, the driving device 1 may include a magnetic force generating device 11 and a driving force transmitting device 12. The magnetic force generating device 11 is used for generating driving force to drive the driving force transmitting device 12 to rotate. The driving force transmission device 12 converts its own rotational motion into a linear motion in the optical axis direction. That is, the driving force transmission device 12 can convert the rotation motion of itself (driving force transmission device 12) into the linear motion along the optical axis direction during the rotation, and when converting into the linear motion along the optical axis direction X, the lens assembly 2 can be driven to perform the linear motion, thereby achieving the focusing of the lens assembly 2.

Referring to fig. 3 and 4, in an embodiment, the magnetic force generating device 11 may include a first electromagnetic unit 111, a second electromagnetic unit 112, a first magnetic body 113, and a second magnetic body 114. Wherein, when the magnetic pole of the first electromagnetic unit 111 is the same as the magnetic pole of the first magnetic body 113, the driving force can be generated; when the magnetic poles of the second electromagnetic unit 112 are identical to those of the second magnetic body 114, the driving force is generated. The magnetic force generating device 11 is coupled to the driving force transmitting device 12 via the first magnetic body 113 and the second magnetic body 114, and the driving force generated by the magnetic force generating device 11 can be transmitted to the driving force transmitting device 12 via the first magnetic body 113 and the second magnetic body 114.

Specifically, the magnetic poles of the first electromagnetic unit 111 are identical to and mutually exclusive from the magnetic poles of the first magnetic body 113, so that the first electromagnetic unit 111 generates a driving force for driving the first magnetic body 113 to rotate. The magnetic poles of the second electromagnetic unit 112 are identical to and mutually exclusive from the magnetic poles of the second magnetic body 114, so that the second electromagnetic unit 112 generates a driving force for driving the second magnetic body 114 to rotate.

In some non-limiting embodiments, referring to fig. 6, schematic diagrams of the relative positions of a worm and a first magnetic body and a second magnetic body are given, and in combination with fig. 6, an included angle between a magnetic pole direction a of the first magnetic body 113 and a magnetic pole direction B of the second magnetic body 114 is 90 degrees. Thus, the magnetic poles of the first magnetic body 113 and the first magnetic body 111 are identical and mutually exclusive, and the magnetic poles of the second magnetic body 114 and the second magnetic body 112 are identical and mutually exclusive, that is, the driving force generated by the identical mutual exclusion of the magnetic poles of the first magnetic body 111 and the first magnetic body 113 and the driving force generated by the identical mutual exclusion of the magnetic poles of the second magnetic body 112 and the second magnetic body 114 can be alternately generated, thereby continuously providing the driving force in the zooming process and ensuring the continuity and stability of the driving force supply. In fig. 6, N indicates north pole and S indicates south pole.

In an implementation, the first electromagnetic unit 111 and the second electromagnetic unit 112 may each include an iron core 15 and a coil 16, where the coil 16 is disposed around the iron core 15. So that when the coil 16 is energized, a magnetic field is generated, under which the core 15 can generate magnetism.

In some embodiments, the angle between the length extension direction of the iron core 15 in the first electromagnetic unit 111 and the iron core 15 in the second electromagnetic unit 112 is related to the arrangement position of the first electromagnetic unit 111 and the second electromagnetic unit 112. For example, referring to fig. 2 to 4, when the first electromagnetic unit 111 and the second electromagnetic unit 112 are arranged in a vertical direction, the angle between the iron cores 15 in the first electromagnetic unit 111 and the iron cores 15 in the second electromagnetic unit 112 is 90 degrees. It is understood that the angle between the two cores 15 in the length direction may take other values, such as 100 degrees, 110 degrees, etc., which are not illustrated here.

In some non-limiting embodiments, one end of the core 15 of the first electromagnetic unit 111 is provided with a first accommodating cavity for accommodating the first magnetic body 113. One end of the iron core 15 of the second electromagnetic unit 112 is provided with a second accommodating cavity, the second accommodating cavity is used for accommodating the second magnetic body 114, and the first accommodating cavity is opposite to the second accommodating cavity.

In some embodiments, the driving force transmission device 12 may include a worm gear 121 and a worm 122. The first end 1221 of the worm 122 is connected to the first magnetic member 113, and the second end 1222 of the worm 122 is connected to the second magnetic member 114. The worm 122 is used for driving the turbine 121 to rotate.

When the first magnetic body 113 and the first electromagnetic unit 111 generate driving force due to the mutual exclusion of the same magnetic poles, the generated driving force can drive the first magnetic body 113 to move, and the first magnetic body 113 is connected to the first end 1221 of the worm 122, so that the first magnetic body 113 can drive the worm 122 to rotate when moving. Similarly, when the second magnetic body 114 and the second electromagnetic unit 112 generate driving force due to the mutual exclusion of the same magnetic poles, the generated driving force can drive the second magnetic body 114 to move, and the second magnetic body 114 is connected to the second end 1222 of the worm, so that the second magnetic body 114 can drive the worm 122 to rotate when moving. When the worm 122 rotates, the turbine 121 can be driven to rotate. The turbine 121 is connected with the lens assembly 2, so that the turbine 121 can rotate to drive the lens assembly 2 to focus.

In a specific implementation, the first magnetic body 113 and the second magnetic body 114 may have a cylindrical shape, the first magnetic body 113 is sleeved on the first end 1221 of the worm 122, and the second magnetic body 114 is sleeved on the second end 1222 of the worm 122. When the first electromagnetic unit 111 and the second electromagnetic unit 112 both include the iron core 15 and the coil 16, and the first accommodating cavity is provided on the iron core 15 of the first electromagnetic unit 111, and the second accommodating cavity is provided on the iron core 15 of the second electromagnetic unit 112, the inner shape of the first accommodating cavity is adapted to the outer surface shape of the first magnetic body 113, and the inner shape of the second accommodating cavity is adapted to the outer surface shape of the second magnetic body 114, so as to facilitate the rotation of the first magnetic body 113 in the first accommodating cavity, and the second magnetic body 114 rotates in the second accommodating cavity.

In a specific implementation, the first magnetic body 113 and the second magnetic body 114 may be members that have magnetism and can attract other metals, such as magnets, and the like.

In a specific implementation, the driving device 1 may further include a control unit 13, where the control unit 13 is configured to control the current directions input to the first electromagnetic unit 111 and the second electromagnetic unit 112. Since the current direction is related to the magnetic pole direction, when the current direction input to the first electromagnetic unit 111 is changed, the magnetic pole direction of the first electromagnetic unit 111 is changed; when the direction of the current input to the second electromagnetic unit 112 changes, the direction of the magnetic pole of the second electromagnetic unit 112 changes.

The direction of the repulsive force generated when the first electromagnetic unit 111 and the first magnetic body 113 are operated can be changed by changing the magnetic pole direction, and similarly, the direction of the repulsive force generated when the second electromagnetic unit 112 and the second magnetic body 114 are operated can be changed. The direction of the driving force generated by the magnetic force generating device 11 can be changed by changing the direction of the repulsive force, and thus the direction in which the driving force transmitting device 12 rotates can be changed, so that the direction in which the rotational movement of the driving force transmitting device 12 is converted into the linear movement in the optical axis direction X can be adjusted.

The embodiment of the present invention further provides a camera module, and a specific structure of the camera module 100 is described below with reference to fig. 1 to 6.

In an implementation, the camera module 100 may include a driving device 1 and a lens assembly 2. The driving device 1 can drive the lens assembly 2 to move along the optical axis direction during focusing of the camera module 100.

In a specific implementation, the driving device 1 may be the driving device 1 provided in any of the foregoing embodiments. The specific working principle and structure of the driving device 1 can be referred to the description in the above embodiments, and the description is omitted here.

In a specific implementation, the camera module 100 may further include a base 4, where the base 4 is used to carry the driving device 1. I.e. the drive device 1 is mounted on the base 4.

In a specific implementation, when the driving force transmission device 12 includes a turbine 121 and a worm 122, the camera module 100 may further include a first positioning unit for limiting the turbine 121 from moving in a radial direction thereof when the turbine 121 rotates around the optical axis direction. By restricting the movement of the turbine 121 in the radial direction of the turbine 121 by the first positioning unit, the turbine 121 can be stably rotated around the optical axis direction, so as to ensure that the turbine 121 drives the lens assembly 2 to stably perform linear movement around the optical axis direction without shifting the optical axis direction.

In some non-limiting embodiments, in conjunction with fig. 3 and 7, the first positioning unit comprises: the first positioning grooves 51, the first balls 52 and the first positioning grooves 51, wherein the first positioning grooves 51 are circumferentially arranged on one side of the base 4 facing the turbine 121; the first positioning groove is circumferentially arranged on one side of the turbine 121, which faces the base 4; a part of each first ball 52 is positioned in the first placing groove 51, and the other part of each first ball 52 is positioned in the first positioning groove, wherein M is more than or equal to 3, N is more than or equal to 3, M is more than or equal to N, and M and N are positive integers.

In some embodiments, the first positioning groove may be in a circular shape, and a part of the first ball 52 is located in the first positioning groove 51, and another part of the first ball 52 is located in the first positioning groove, so that when the turbine 121 rotates, the first ball 52 rotates in a space defined by the first positioning groove and the first positioning groove 51, and thus the first ball 52 does not affect the rotation of the turbine 121 while limiting the radial movement of the turbine 121 along the turbine 121.

In a non-limiting embodiment, the M first placement grooves 51 may be disposed at uniform circumferential intervals on a side of the base 4 facing the turbine 121. The M first placement grooves 51 may be provided at non-uniform circumferential intervals on the side of the base 4 facing the turbine 121.

In one non-limiting embodiment, the number of first placement grooves 51 and the first balls 52 are 3. The arrangement of the 3 first placement grooves 51 and the 3 first balls 52, respectively, can simplify the structural design while providing radial movement of the turbine 121 around itself. It should be noted that the number of the first placement grooves 51 and the number of the first balls 52 may be greater than 3, which is not illustrated here.

In a specific implementation, the lens assembly 2 may include a lens barrel 21 and a lens disposed on the lens barrel 21. The number of lenses may be one or a plurality of lenses. When the driving force transmission device 12 includes a worm gear 121 and a worm 122, the lens barrel 21 is connected to the worm gear 121 and is rotatable relative to the worm gear 121.

In a specific implementation, the lens barrel 21 may be connected to the turbine 121 in a variety of ways.

In some embodiments of the present invention, the lens barrel 21 is provided with external threads, and the turbine 121 is provided with internal threads, and the external threads are matched with the internal threads. The connection between the barrel 21 and the turbine 121 can be achieved by the connection between the external screw and the internal screw. Furthermore, by means of the connection position between the external thread and the internal thread, the turbine 121 can carry the lens barrel 21 in a linear movement in the optical axis direction.

In other embodiments of the present invention, the lens barrel 21 is provided with a supporting column, and the inner wall of the turbine 121 is provided with a clamping groove, and the supporting column is clamped in the clamping groove, and the clamping groove is spiral.

In still other embodiments of the present invention, the inner wall of the turbine 121 is provided with a support column, and the lens barrel 21 is provided with a clamping groove, and the support column is clamped in the clamping groove, and the clamping groove is spiral.

Because the support column is clamped in the clamping groove, and the clamping groove is in a spiral shape, when the turbine 121 rotates, the relative position between the support column and the clamping groove changes, and the support column rises or falls along the clamping groove in a spiral manner, so that the turbine 121 can drive the lens barrel 21 to perform linear motion in the optical axis direction.

In a specific implementation, when the lens barrel 21 and the turbine 121 are connected with the clamping groove in a matched manner through the supporting columns, the two positions of the supporting columns are tangent to the clamping groove, so that the stability of the movement of the lens assembly 2 in the optical axis direction is improved when the turbine 121 rotates, and shaking is avoided.

Further, in order to improve the stability of the turbine 121 driving the lens assembly 2 to move, the number of the clamping grooves is two, the number of the supporting columns is two, and each supporting column is respectively located in the corresponding clamping groove.

In a specific implementation, to facilitate the installation between the lens assembly 2 and the turbine 121, the two support columns are symmetrically arranged, the spiral lowest points of the two clamping grooves are at the same height, and the spiral highest points of the two clamping grooves are at the same height.

It can be understood that the two support columns may be asymmetrically arranged, that is, the two support columns may not be at the same height, and at this time, the lowest points of the two clamping grooves are not at the same height, and the highest points of the two clamping grooves are not at the same height. The requirement of the whole assembly of the lens component 2 can be met only after the two support columns are clamped in the corresponding clamping grooves.

In a specific implementation, the spiral angle of the clamping groove may be configured according to the requirements of the camera module 100 on the movement stroke of the lens assembly 2 along the optical axis direction during zooming, the response time of zooming, and the like. Under the condition of the same zoom multiplying power, the larger the spiral angle of the clamping groove is, the shorter the corresponding response time of zooming is. Under the condition that the size of the camera module is fixed, the travel along the optical axis direction is large, and the spiral angle of the clamping groove is larger.

In a specific implementation, the camera module 100 may further include a housing 3, where the housing 3 is connected with the base 4 and forms a containing cavity, the driving device 1 and the lens assembly 2 are located in the containing cavity, and an opening 311 for exposing the lens assembly 2 is provided on the housing 3, so as to avoid the shielding of the housing 3 to the lens assembly 2, and ensure that the camera module 100 can perform image capturing normally.

In a specific implementation, the camera module 100 may further include a limiting component, where the limiting component includes a first limiting portion and a second limiting portion, the first limiting portion is disposed on the lens barrel 21, the second limiting portion is disposed on the housing 3, and the first limiting portion is matched with the second limiting portion to limit the lens barrel 21 to rotate relative to the housing 3. By adjusting the relative positions of the driving device 1 and the lens component, the relative distance between the lens component 2 and the image processing device is realized, so that zooming is realized, and the stability of the lens component 2 is ensured in the zooming process.

In implementations, the spacing assembly may have a variety of implementations. For example, the first limiting portion is a buckle, and the second limiting portion is a clamping groove. For another example, the first limiting portion is a clamping groove, and the second limiting portion is a buckle. For another example, the first limiting portion is a clamping groove, and the second limiting portion is a protrusion. For another example, the first limiting portion is a protrusion, and the second limiting portion is a clamping groove. It should be understood that the first limiting portion and the second limiting portion may have other structural forms, which are not illustrated herein, and only need to limit the rotation of the lens assembly 2 relative to the housing 3.

In a specific implementation, the camera module 100 may further include a dustproof film assembly 7, where the dustproof film assembly 7 wraps the outer surface of the lens assembly 2, so as to prevent dust and other foreign matters from entering the lens assembly 2, and affect the imaging quality of the camera module 100.

The dustproof membrane assembly 7 may include: the cover plate 71, the dustproof film 72 and the lens protection structure 73, wherein the dustproof film 72 is connected with the cover plate 71 and the lens protection structure 73, respectively.

The lens protection structure 73 is sleeved on the lens assembly 2. Specifically, the lens protection structure 73 is sleeved on the outer surface of the lens barrel 21 of the lens assembly 2. The cover plate 71 is provided with openings of a size adapted to the dimensions of the lens protection structure 73. The dustproof film 72 is connected to the cover plate 71 and the lens protection structure 73, and the dustproof film 72 is connected to the opening and the lens protection structure 73.

Further, the dustproof film 72 has tensile elasticity, and when the lens assembly 2 moves in the optical axis direction, the dustproof film 72 can be subjected to tensile deformation, so that the lens assembly 2 can be well matched with zooming while foreign matters are prevented from entering the lens assembly 2.

In a specific implementation, the camera module 100 further includes a second positioning unit, where the second positioning unit is configured to limit the movement of the turbine 121 in its own radial direction, that is, may limit the movement of the turbine 121 in the radial direction of the turbine 121 when the lens assembly 2 moves in the optical axis direction. The second positioning unit can further limit the movement of the turbine 121 along the radial direction of the turbine 121, so that the turbine 121 can stably rotate around the optical axis direction, and further ensure that the turbine 121 drives the lens assembly 2 to stably perform linear movement around the optical axis direction without shifting the optical axis direction.

In an implementation, in conjunction with fig. 4, the second positioning unit includes: p second placing grooves, Q second balls 82, and a second positioning groove 83, wherein the P second placing grooves are circumferentially and alternately arranged on one side of the cover plate 71 facing the turbine 121; the second positioning groove 83 is circumferentially arranged at one side of the turbine 121 away from the base 4; a part of each second ball 82 is positioned in the second placing groove, and the other part of each second ball 82 is positioned in the second positioning groove 83, wherein P is more than or equal to 3, Q is more than or equal to 3, P is more than or equal to Q, and P and Q are positive integers.

In some embodiments, the second positioning groove 83 may be in a ring shape, and a part of the second ball 82 is located in the second positioning groove, and another part of the second ball 82 is located in the second positioning groove 83, so that when the turbine 121 rotates, the second ball 82 rotates in a space defined by the second positioning groove and the second positioning groove 83, and thus the second ball 82 does not affect the rotation of the turbine 121 while limiting the radial movement of the turbine 121 along the turbine 121.

In some non-limiting embodiments, P second placement grooves may be provided at uniform circumferential intervals on a side of the cover plate 71 facing the turbine 121. The P second placement grooves may be disposed at non-uniform circumferential intervals on a side of the cover plate 71 facing the turbine 121.

In some non-limiting embodiments, the number of second placement grooves and the second balls 82 are 3. The arrangement of 3 second placement grooves and 3 second balls 82, respectively, can simplify the structural design while effecting radial movement of the turbine 121 around itself. It should be noted that the number of the second placement grooves and the number of the second balls 82 may be greater than 3, which is not exemplified here.

In a specific implementation, the second placement groove does not penetrate through the cover plate 71, so as to ensure the sealing performance of the dustproof membrane module 7, and prevent foreign matters such as dust from entering the lens module 2 through the second placement groove.

Further, the base 4 is provided with a mounting portion for placing the driving device 1.

In a specific implementation, the shape of the mounting portion is adapted to the shape of the outer surface of the driving device 1.

In a specific implementation, when the driving force transmission device 12 includes the turbine 121 and the worm 122, the mounting portion may include a turbine receiving cavity adapted to an outer shape of the turbine 121, and the turbine 121 is located in the turbine receiving cavity. The bottom 44 of the turbine housing cavity has an aperture 43, which aperture 43 is used to expose the photosensitive area of the image processing device in the camera module 100. The diameter of the bore 43 is smaller than the diameter of the opening at the top of the turbine receiving cavity and the diameter of the bore is smaller than the outer diameter of the turbine 121 to ensure that the turbine 121 can be mounted to the base 4.

Further, the turbine housing chamber is defined by the stopper 42, the first electromagnetic unit 111, and the second electromagnetic unit 113 on the base 4. The inner portion of the limiting block 42 is arc-shaped, so that the turbine 121 can at least expose part of the structure, and the turbine 121 can be matched with the worm 122.

The mounting portion includes a support portion 41, and the support portion 41 is used to support the worm 122 so that the worm 122 is not affected by other components when rotating.

Specifically, the support portion may include two opposite side walls 411, each side wall 411 is provided with a hole, the hole is used for passing through a first end 1221 and a second end 1222 of the worm 122, a receiving space is formed between the two side walls 411, the receiving space is used for placing a spiral structure portion 1223 of the worm 122, the spiral structure portion 1223 is located between the first end 1221 and the second end 1222, and the spiral structure portion 1223 is engaged with teeth of the turbine 121 to drive the turbine 121 to rotate.

In a specific implementation, the camera module 100 may further comprise a position feedback system for detecting the movement displacement of the lens assembly 2. The position of the lens assembly 2 can be determined according to the movement displacement of the lens assembly 2 detected by the position feedback system, so as to provide a basis for monitoring and adjusting the position of the lens assembly 2 during focusing of the camera module 100.

In some embodiments, to facilitate the installation of the camera module 100, the partial components provided in the above embodiments may be assembled together to form one unit according to need, and then the formed unit may be reinstalled.

For example, the driving device 1 may be mounted to the base 4 to form the fixing unit 9. Wherein the position of the lens assembly 2 may be changed with respect to the stationary unit 9 during zooming.

It should be noted that the camera module 100 may further include an image processing device, and the image processing device may be an image sensor. The camera module 100 may further include a filter, which is located between the lens assembly 2 and the image processing device, and the filter is located above the image processing device.

Further, the optical filter is located right above the photosensitive area of the image processing device.

The camera module 100 may also include some other components, which are not illustrated here.

In specific implementation, reference may be made to the description of the driving device 1 provided in the above embodiment of the present invention for the specific working principle and working procedure of the driving device 1, which are not repeated here.

The embodiment of the invention also provides electronic equipment. The electronic device may include the driving apparatus 1 provided in any of the above embodiments, or the camera module 100 provided in any of the above embodiments. With respect to the driving device 1 or the camera module 100.

In a specific implementation, the electronic device may include a mobile phone, a tablet computer, and other devices with a camera function.

In specific implementation, the specific working principle and working flow of the camera module or the driving device in the electronic device may be referred to the description of the camera module or the driving device in any of the above embodiments, which is not repeated herein.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims (27)

1. A driving device for a camera module, comprising: magnetic force generating means and driving force transmitting means, wherein:

the magnetic force generating device is used for generating driving force to drive the driving force transmission device to rotate;

the driving force transmission device is used for converting the rotation motion of the driving force transmission device into linear motion along the optical axis direction so as to drive the lens component of the camera module to realize focusing;

wherein the magnetic force generating device comprises: the magnetic force generating device is coupled with the driving force transmitting device through the first magnetic body and the second magnetic body;

the driving force transmission device includes: turbine and worm, wherein:

the first end of the worm is connected with the first magnetic body, the second end of the worm is connected with the second magnetic body, and the worm is used for driving the turbine to rotate;

the turbine is coupled to the lens assembly.

2. The drive device according to claim 1, wherein an angle between a magnetic pole direction of the first magnetic body and a magnetic pole direction of the second magnetic body is 90 degrees.

3. The drive device of claim 1, wherein the first electromagnetic unit and the second electromagnetic unit each comprise a core and a coil wound around the core.

4. A drive arrangement as claimed in claim 3, wherein the angle between the lengths of the two cores extends at 90 degrees.

5. A driving device according to claim 3, wherein one end of the core of the first electromagnetic unit is provided with a first accommodation chamber for accommodating the first magnetic body; one end of the iron core of the second electromagnetic unit is provided with a second accommodating cavity, the second accommodating cavity is used for accommodating the second magnetic body, and the first accommodating cavity and the second accommodating cavity are arranged oppositely.

6. The driving device according to claim 1, wherein the first magnetic body and the second magnetic body are both cylindrical, the first magnetic body is sleeved at the first end of the worm, and the second magnetic body is sleeved at the second end of the worm.

7. The drive device according to claim 1, further comprising: and the control unit is used for controlling the current directions input to the first electromagnetic unit and the second electromagnetic unit so as to change the magnetic pole directions of the first electromagnetic unit and the second electromagnetic unit.

8. A camera module, comprising: a driving device according to any one of claims 1 to 7 and a lens assembly, said driving device being adapted to drive said lens assembly to move in the direction of the optical axis during focusing of said camera module.

9. The camera module of claim 8, further comprising a base for carrying the drive means.

10. A camera module according to claim 9, wherein when said driving force transmission means includes a worm wheel and a worm screw, said camera module further includes a first positioning unit for restricting movement of said worm wheel in a radial direction thereof when said worm wheel rotates about said optical axis direction.

11. The camera module of claim 10, wherein the first positioning unit comprises:

m first placing grooves, N first balls and first positioning grooves, wherein,

the M first placing grooves are circumferentially arranged on one side of the base, which faces the turbine;

the first positioning groove is circumferentially arranged on one side of the turbine, which faces the base;

one part of each first ball is positioned in the first placing groove, the other part of each first ball is positioned in the first positioning groove, M is more than or equal to 3, N is more than or equal to 3, M is more than or equal to N, and M and N are positive integers.

12. A camera module according to any one of claims 9 to 11, wherein the lens assembly comprises a barrel and a lens disposed on the barrel, the barrel being connected to and rotatable relative to the turbine when the driving force transmission means comprises the turbine and the worm.

13. The camera module of claim 12, further comprising a housing coupled to the base and defining a receiving cavity, the drive device and the lens assembly being positioned within the receiving cavity, the housing having an opening for exposing the lens assembly.

14. The camera module of claim 13, further comprising a limiting assembly, the limiting assembly comprising a first limiting portion and a second limiting portion, the first limiting portion being disposed on the lens barrel, the second limiting portion being disposed on the housing, the first limiting portion cooperating with the second limiting portion to limit rotation of the lens barrel relative to the housing.

15. The camera module of claim 13, further comprising a dust-proof membrane assembly that covers an outer surface of the lens assembly.

16. The camera module of claim 15, wherein the dust-proof membrane assembly comprises: the dustproof cover plate is connected with the cover plate and the lens protection structure respectively.

17. The camera module of claim 16, further comprising a second positioning unit for limiting movement of the turbine in its own radial direction when the lens assembly is moved in the direction of the optical axis.

18. The camera module of claim 17, wherein the second positioning unit comprises:

p second placing grooves, Q second balls and a second positioning groove, wherein,

the P second placing grooves are circumferentially arranged on one side, facing the turbine, of the cover plate at intervals, and are used for placing the second balls;

the second positioning groove is circumferentially arranged on one side, far away from the base, of the turbine;

one part of each second ball is positioned in the second placing groove, the other part of each second ball is positioned in the second positioning groove, P is more than or equal to 3, Q is more than or equal to 3, P is more than or equal to Q, and P and Q are positive integers.

19. The camera module of claim 18, wherein the second placement groove does not penetrate the cover plate.

20. The camera module of claim 12, wherein the barrel is provided with external threads and the turbine is provided with internal threads, the external threads being adapted to the internal threads.

21. The camera module as recited in claim 12, wherein,

the lens cone is provided with a support column, the inner wall of the turbine is provided with a clamping groove, the support column is clamped in the clamping groove, and the clamping groove is in a spiral shape;

or, the inner wall of the turbine is provided with a support column, the lens barrel is provided with a clamping groove, the support column is clamped in the clamping groove, and the clamping groove is spiral.

22. The camera module of claim 21, wherein the support post is tangential to the slot at two locations.

23. The camera module of claim 9, wherein the base is provided with a mounting portion for receiving the driving device.

24. A camera module according to claim 23, wherein the mounting portion is shaped to conform to the shape of the outer surface of the drive means.

25. A camera module according to claim 24, wherein when said driving force transmission means includes a worm wheel and a worm, said mounting portion includes a support portion for supporting said worm.

26. The camera module of claim 8, further comprising a position feedback system for detecting a movement displacement of the lens assembly.

27. An electronic device comprising the driving apparatus according to any one of claims 1 to 7, or comprising the camera module according to any one of claims 8 to 26.