Driving device, camera module and electronic equipment

Abstract

The embodiments of the present application provide a driving device, a camera module, and an electronic device. The driving device is applied to a camera module, which includes a plurality of lens group assemblies. The driving device includes: a driving portion, a moving portion, and a transmission assembly, wherein the driving portion is used to provide a driving force to drive the moving portion to move along the optical axis direction of the camera module, and the transmission assembly is used to connect the moving portion and at least one of the plurality of lens group assemblies, so that the relative positions of the moving portion and the at least one lens group assembly in the optical axis direction of the camera module are fixed and can move relative to each other in other directions. The driving device provided in the present application, by arranging a transmission assembly between the moving portion and the lens group assembly, realizes decoupling of the moving portion of the driving device and the lens group assembly in directions other than the optical axis direction of the camera module, thereby preventing the moving portion and the lens group assembly from becoming stuck due to the movement direction of the moving portion deviating from the optical axis direction of the camera module.

Description

Technical Field

[0001] The present application relates to the field of camera technology, and in particular to a driving device, a camera module and an electronic device. Background Art

[0002] To enhance the competitiveness of mobile phones, tablet computers, and other terminal devices, camera modules with integrated zoom functions have become standard features in current terminal devices. Such camera modules enable both long-range shooting with a large focal length and wide-angle shooting with a small focal length, thus meeting users' shooting needs in a variety of scenarios. To achieve the zoom function, the camera module is typically equipped with a motor to drive the lens. The motor carries and drives the lens along the optical axis of the camera module to achieve zoom. However, due to changes in the friction interface between the lens and the guide rod, the motor's stroke accuracy is poor, the dynamic tilt angle of the drive is too large, and even the motor drive may become stuck, seriously affecting the camera module's photography effect and causing functional failure. Summary of the Invention

[0003] The embodiments of the present application provide a driving device, a camera module and an electronic device. By arranging a transmission assembly between the driving device and the mirror group assembly, the driving device and the mirror group assembly are decoupled in directions other than the optical axis direction of the camera module, thereby preventing the dynamic inclination angle of the drive from being too large and the motor drive from being stuck, thereby avoiding affecting the shooting effect of the camera module.

[0004] In the first aspect, an embodiment of the present application provides a driving device, which is applied to a camera module, the camera module including multiple lens group assemblies, the driving device including: a driving part, a moving part and a transmission assembly, wherein the driving part is used to provide driving force to drive the moving part to move along the optical axis direction of the camera module, and the transmission assembly transmits and connects the moving part and at least one lens group assembly among the multiple lens group assemblies, so that the relative position of the moving part and the at least one lens group assembly in the optical axis direction of the camera module is fixed, and they can move relative to each other in other directions.

[0005] The driving device provided in the embodiment of the present application realizes decoupling of the moving part of the driving device and the mirror group assembly in directions other than the optical axis direction of the camera module by setting a transmission assembly between the moving part and the mirror group assembly, thereby preventing the moving part and the mirror group assembly from getting stuck due to the movement direction of the moving part deviating from the optical axis direction of the camera module.

[0006] In one possible implementation, the transmission assembly includes: a connecting arm, a connecting portion and a connecting rod; wherein, the extending direction of the connecting arm is the same as the optical axis direction of the camera module, one end of the connecting arm is fixedly connected to the moving portion in the extending direction, and the other end extends to a side away from the moving portion, and an elastic structure is provided on the connecting arm, which can produce elastic deformation in the extending direction of the connecting rod, and one end of the connecting rod is fixedly connected to the elastic structure; the connecting portion is provided corresponding to the connecting arm, one end of which is fixedly connected to at least one mirror group assembly, and a positioning hole is provided on it; the other end of the connecting rod is passed through the positioning hole.

[0007] The embodiment of the present application uses a transmission device composed of a connecting arm, a connecting part with a positioning hole and a connecting rod. On the basis of realizing a transmission connection between a driving device and a mirror group assembly to drive the movement of the mirror group assembly, the elastic structure can absorb the deviation of the driving device in a direction perpendicular to the optical axis direction of the camera module, thereby realizing decoupling of the movement of the driving device and the movement of the camera module in this direction.

[0008] In another possible implementation, the elastic structure is a curved protrusion on the connecting arm; the connecting arm includes a straight portion and the curved protrusion. When the curved protrusion undergoes elastic deformation, the top of the curved protrusion can move between the plane of the curved protrusion and the straight portion. One end of the connecting rod is fixedly mounted on the top of the curved protrusion. Using the curved protrusion on the connecting arm as the elastic structure simplifies the elastic structure.

[0009] In another possible implementation, a limiting structure is provided on the outer wall surface of the connecting rod, the limiting structure protruding from the outer wall surface of the connecting rod, and the outer wall surface of the limiting structure abuts against the connecting portion to limit the length of the connecting rod passing through the positioning hole.

[0010] In another possible implementation, the limiting structure is a conical protrusion structure protruding from the outer wall surface of the connecting rod, and the cross-sectional area of ​​the conical protrusion structure gradually increases from an end close to the connecting portion to an end close to the connecting arm.

[0011] In another possible implementation, the outer wall surface of the connecting rod is in close contact with the inner wall surface of the positioning hole in the optical axis direction of the camera module, thereby achieving the driving accuracy of the driving device on the mirror group assembly and eliminating driving hysteresis.

[0012] In another possible implementation, the positioning hole is a waist-shaped hole, the extension direction of the waist-shaped hole is perpendicular to the optical axis direction of the camera module, and the connecting rod and the waist-shaped hole slide together in the extension direction of the waist-shaped hole, thereby achieving decoupling of the movement of the driving device and the movement of the mirror group assembly in directions other than the optical axis direction of the camera module.

[0013] In the second aspect, an embodiment of the present application provides a camera module, comprising a plurality of lens group assemblies, at least one driving device of the first aspect, at least one first guide member and at least one second guide member; wherein the driving device is used to drive at least one of the plurality of lens group assemblies to move along the optical axis direction of the camera module; the first guide member is extended along the optical axis direction of the camera module, for guiding at least one lens group assembly to move along the optical axis direction of the camera module; the second guide member is extended along the optical axis direction of the camera module, for guiding the moving part of the driving device to move along the optical axis direction of the camera module.

[0014] The camera module provided in the embodiment of the present application guides the mirror group assembly and the driving device to move along the optical axis direction of the camera module by setting a guide structure composed of a first guide member and a second guide member. The transmission assembly of the driving device decouples the movement of the driving device and the movement of the mirror group assembly in the non-optical axis direction to absorb the tolerance caused by the non-parallelism of the first guide member and the second guide member, avoid the problem of the driving device being stuck during long-stroke movement, ensure the position accuracy of the driving device and the mirror group assembly during movement, and no hysteresis. At the same time, there is no need to remove the guide member of the driving device while ensuring the driving accuracy and reliability, which not only simplifies the assembly process but also ensures the consistency of the calibration of the driving device.

[0015] In another possible implementation, at least one first guide member includes two first guide rods arranged parallel to each other, two first connecting holes adapted to the two first guide rods are provided on at least one mirror group assembly, and the two first guide rods are passed through the two first connecting holes to enable at least one mirror group assembly to slide with the two first guide rods; at least one second guide member includes two second guide rods arranged parallel to each other, two second connecting holes adapted to the two second guide rods are provided on the moving part of at least one driving device, and the two second guide rods are passed through the two second connecting holes to enable the moving part of at least one driving device to slide with the two second guide rods, so that the two first guide rods and the two second guide rods form a four-guide rod guide structure, which guides the mirror group assembly and the driving device to move along the optical axis direction of the camera module, thereby ensuring the structural reliability of the guide structure.

[0016] In another possible implementation, at least one first guide member is provided to include a first guide rod and a first ball arranged parallel to each other, the first ball including a plurality of balls arranged along the optical axis direction of the camera module; a first connecting hole adapted to the first guide rod and a first rolling groove adapted to the first ball are respectively provided on at least one mirror group assembly, the first guide rod is passed through the first connecting hole, and the first ball is in rolling contact with the first rolling groove; at least one second guide member is provided to include a second guide rod and a second ball arranged parallel to each other, the second ball including a plurality of balls arranged along the optical axis direction of the camera module; a second connecting hole adapted to the second guide rod and a second rolling groove adapted to the second ball are respectively provided on the moving part of at least one driving device, the second guide rod is passed through the second connecting hole, and the second ball is in rolling contact with the second rolling groove; wherein, the first guide rod and the second guide rod are arranged on the same side of at least one mirror group assembly.

[0017] In another possible implementation, a groove structure is formed on a side of the movable portion of at least one driving device proximate to at least one lens assembly, and the at least one lens assembly is partially or completely positioned within the groove structure. The groove structure provided on the movable portion of the driving device forms a relief groove so that the lens assembly can be partially or completely positioned within the groove structure, thereby making the camera module compact and thinner.

[0018] In another possible implementation, at least one lens group assembly includes a zoom lens group assembly and a focus lens group assembly; at least one driving device includes a zoom driving device for driving the movement of the zoom lens group assembly and a focus driving device for driving the movement of the focus lens group assembly; the camera module also includes: a locking structure for locking the moving part of the zoom driving device when the zoom driving device stops working.

[0019] The camera module of the embodiment of the present application is provided with a locking structure to ensure that the moving part of the driving device is stabilized in a specific position when the driving device is not working, thereby preventing the moving part of the driving device from shaking when the camera module is impacted or shaken, thereby causing problems such as abnormal impact noise and impact dust.

[0020] In a third aspect, an embodiment of the present application provides an electronic device, comprising the driving device of the first aspect and the camera module of the second aspect.

[0021] The electronic device provided in the embodiment of the present application is equipped with the driving device of the first aspect and the camera module of the second aspect, so that the driving device can accurately drive the zoom lens group and the focus lens group of the camera module, thereby achieving good zoom and focus effects of the camera module, thereby enabling the electronic device to have high-quality shooting effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following is a brief introduction to the drawings required for describing the embodiments or prior art.

[0023] Figure 1 An exploded view of a camera module provided in an embodiment of the present application;

[0024] Figure 2 A schematic structural diagram of a camera module provided in an embodiment of the present application;

[0025] Figure 3 A top view of a camera module provided in an embodiment of the present application;

[0026] Figure 4 A cross-sectional view of a camera module provided by an embodiment of the present application along the plane where the focusing lens group component is located;

[0027] Figure 5 and Figure 6 Schematic diagram of the connecting arm 61 and the connecting rod 62 of the transmission assembly 60 provided on the moving portion 212;

[0028] Figure 7 Schematic diagram of the connecting portion 63 of the transmission assembly 60 provided on the zoom lens group assembly 11;

[0029] Figure 8 A schematic structural diagram of a transmission assembly of a camera module provided in an embodiment of the present application;

[0030] Figure 9 A top view of a transmission assembly of a camera module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0032] In the description of this application, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting this application.

[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In order to realize the automatic zoom and / or automatic focus function of the camera module, a driving device is provided in the camera module for driving the zoom lens group and / or the focus lens group to move along the optical axis of the camera module. The driving device includes a driving part and a carrier. The carrier carries the zoom lens group and / or the focus lens group (for example, the zoom lens group and / or the focus lens group are bonded to the carrier by adhesive). The driving part provides driving force to drive the carrier to move, thereby driving the zoom lens group and / or the focus lens group to move to realize the automatic zoom and / or automatic focus function of the camera module.

[0035] In the related art, in order to make the movement of the zoom lens group and / or the focus lens group move along the optical axis of the camera module, a lens group guide rod extending along the optical axis is provided in the camera module, the zoom lens group and / or the focus lens group is mounted on the lens group guide rod and slides with the lens group guide rod, and the lens group guide rod guides the movement of the zoom lens group and / or the focus lens group along the optical axis of the camera module, and at the same time provides a basis for the positioning of the zoom lens group and / or the focus lens group. In order to make the carrier of the driving device move along the optical axis of the camera module, a driving guide rod extending along the optical axis of the camera module is provided on the camera module, the carrier is mounted on the driving guide rod to complete the calibration of the driving device, and the driving part of the driving device drives the carrier to move, driving the zoom lens group and / or the focus lens group to move along the optical axis of the camera module to realize the automatic zoom and / or automatic focus function of the camera module.

[0036] However, the camera module in the above technical solution may have the problem that when the driving guide rod is not parallel to the lens group guide rod due to installation error or impact, the rigid connection or quasi-rigid connection between the carrier and the zoom lens group and / or focus lens group cannot absorb the non-parallel tolerance of the driving guide rod and the lens group guide rod, causing the driving device to get stuck, and then the automatic zoom and / or automatic focus function of the camera module to fail.

[0037] In another solution, after the drive device is calibrated, the drive guide rod is removed to overcome the problem of non-parallelism between the drive guide rod and the lens group guide rod. However, after the drive guide rod is removed, on the one hand, the carrier loses the support of the drive guide rod, so that the weight of the carrier and the zoom lens group and / or focus lens group is concentrated on the lens group guide rod, increasing the load on the lens group guide rod, and increasing the friction between the zoom lens group and / or focus lens group and the lens group guide rod, affecting the smoothness of the movement of the zoom lens group and / or focus lens group; on the other hand, the calibration of the drive device is carried out under the condition that the drive guide rod is installed. After the drive guide rod is removed, the calibration data of the drive device is bound to be different from the calibration data before the drive guide rod is removed, resulting in problems with the driving accuracy of the drive device.

[0038] The embodiment of the present application provides a camera module, which is provided with a lens group guide rod and a driving guide rod respectively extending along the optical axis of the camera module, wherein the zoom lens group and / or the focus lens group are respectively mounted on the lens group guide rod, and the carrier of the driving device is mounted on the driving guide rod. The carrier of the driving device and the zoom lens group and / or the focus lens group are connected by a transmission assembly, so that the relative position of the moving part and at least one lens group assembly in the optical axis direction of the camera module is fixed, and they can move relative to each other in other directions. The movement of the driving device in the non-optical axis direction is decoupled from the movement of the zoom lens group and / or the focus lens group, and the non-parallel tolerance between the driving guide rod and the lens group guide rod can be absorbed, so as to avoid the driving of the driving device from being stuck, and ensure that the camera module has a good automatic zoom and / or automatic focus effect.

[0039] The following combination Figures 1-9 The structure of the camera module provided by the implementation of this application is introduced in detail.

[0040] Figure 1 This is an exploded view of a camera module provided in an embodiment of the present application. Figure 1 As shown, the camera module includes a housing 50, a plurality of lens group components (such as Figure 1 Mirror group assembly 11, mirror group assembly 12, mirror group assembly 13 and mirror group assembly 14), a driving device (e.g., Figure 1 The driving device is composed of the driving part 221 and the moving part 222).

[0041] The housing 50 has an accommodating space, and a plurality of supporting parts are provided on the inner wall of the accommodating space. The plurality of mirror group components and the driving device are arranged in the accommodating space defined by the housing 50 through the plurality of supporting parts.

[0042] It is easy to understand that the main optical axes of the multiple lens group components are arranged to overlap with each other, and the main optical axes of the multiple lens group components are the optical axes of the camera module.

[0043] The movement of the lens group assembly 11 along the optical axis can realize the zoom function of the camera module, so the lens group assembly 11 can be called a zoom lens group assembly 11.

[0044] In order to make the zoom lens group assembly 11 move along the optical axis, a lens group guide rod 30 is set in the housing 50. The extension direction of the lens group guide rod 30 is the same as the optical axis direction. The zoom lens group assembly 11 is sleeved on the outer wall of the lens group guide rod 30 and slides with the lens group guide rod 30. The lens group guide rod 30 guides the zoom lens group assembly 11 to move along the optical axis.

[0045] For example, in order to make the zoom lens group assembly 11 move more smoothly in the preset direction (ie, the optical axis direction), a plurality of lens group guide rods 30 may be arranged at intervals, for example Figure 1In the embodiment, two lens group guide rods 30 are parallel to each other and are distributed at opposite ends of the zoom lens group assembly 11, so that the zoom lens group assembly 11 moves along the plane where the two lens group guide rods 30 are located.

[0046] A plurality of mirror group components are all installed on the mirror group guide rod 30, for example, Figure 1 In the figure, the mirror group assembly 11, the mirror group assembly 12, the mirror group assembly 13 and the mirror group assembly 14 are all passed through the mirror group guide rod 30 to realize the installation and positioning of the multiple mirror group assemblies and ensure that the optical axes of the multiple mirror group assemblies coincide.

[0047] The mirror group components that do not need to move are fixedly assembled with the mirror group guide rod 30, for example Figure 1 The middle mirror group assembly 13 and the mirror group assembly 14 are fixedly mounted on the mirror group guide rod 30 .

[0048] Any of the multiple lens group assemblies includes a lens group bracket and at least one lens. The lens is fixedly arranged in the lens group bracket. The lens can be fixedly connected to the lens group bracket in a variety of ways, such as snap connection, screw connection, gluing, etc., and the appropriate connection method can be selected according to actual conditions. The embodiment of the present application does not limit the connection method between the lens and the lens bracket.

[0049] A through hole is provided on the lens bracket, and the lens group guide rod is penetrated through the through hole to realize the installation of the lens group component and the lens group guide rod.

[0050] like Figure 2 As shown, the camera module includes a driving device 21 for driving the zoom lens group assembly 11 to move. The driving device 21 is set at a position corresponding to the zoom lens group assembly 11 on the housing 50, and drives the zoom lens group assembly 11 to reciprocate along the optical axis to achieve automatic zoom.

[0051] Continue to see Figure 1 The driving device 21 includes a driving part 211, a moving part 212 and a transmission assembly 60. The driving part 211 is fixedly mounted on the inner wall of the housing 50. The moving part 212 can move along the direction of the optical axis. The driving part 211 provides a driving force to drive the moving part 212 to move. The transmission assembly 60 transmits and connects the moving part 212 and the zoom lens group assembly 11. The movement of the moving part 212 drives the movement of the zoom lens group assembly 11 to realize automatic zooming of the camera module.

[0052] In order to make the movable part 212 move along the optical axis, the camera module also includes a driving guide rod 40, which extends along the optical axis direction. The movable part 212 is sleeved on the driving guide rod 40 and slides with the driving guide rod 40. The driving guide rod 40 guides the movable part to move along the optical axis direction.

[0053] For example, in order to make the moving part 212 move more smoothly in the preset direction (ie, the optical axis direction), a plurality of driving guide rods 40 may be arranged at intervals, for example Figure 1 In the embodiment, the two driving guide rods 40 are parallel to each other and are distributed at opposite ends of the moving portion 212, so that the moving portion 212 moves along the plane where the two driving guide rods 40 are located.

[0054] It is easy to understand that the mirror group guide rod and the driving guide rod are only a kind of implementation method of the guide member used to guide the mirror group assembly and the moving part of the driving device to move along the optical axis direction respectively. The guide member can have multiple implementation methods. For example, the guide member can be a guide rail extending along the optical axis direction, and a guide groove adapted to the guide rail is provided on the mirror group assembly and / or the moving part. The guide rail and the guide groove slide in cooperation to guide the mirror group assembly and / or the moving part to move along the optical axis direction; or, the guide member can also be a ball assembly provided along the optical axis direction, the ball assembly includes a plurality of balls extending along the optical axis direction, and a rolling groove adapted to the ball assembly is provided on the mirror group assembly and / or the moving part. The balls of the ball assembly are in rolling contact with the rolling groove to guide the mirror group assembly and / or the moving part to move along the optical axis direction.

[0055] The mirror group guide member and the driving guide member can be the same guide member, for example, the mirror group guide member and the driving guide member can both be guide rods. The mirror group guide member and the driving guide member can also be different guide members, for example, the mirror group guide member is a mirror group guide rod, and the driving guide member is a driving guide rail.

[0056] The plurality of mirror group guide members may be the same guide member, and the plurality of driving guide members may be the same guide member; for example, the plurality of mirror group guide mirrors are all mirror group guide rods, and the plurality of driving guide members are all driving guide rods.

[0057] Alternatively, the multiple mirror group guides are different guides, and the multiple driving guides are different guides; for example, one of the two mirror group guides is a mirror group guide rod, and the other is a mirror group ball; one of the two driving guides is a driving guide rod, and the other is a driving ball. Exemplarily, the mirror group guide member includes a mirror group guide rod and a mirror group ball disposed in parallel with each other, and the mirror group ball includes a plurality of ball bearings disposed along the optical axis direction of the camera module; a first connecting hole adapted to the mirror group guide rod and a first rolling groove adapted to the mirror group ball bearing are respectively provided on the zoom mirror group assembly, the mirror group guide rod is passed through the first connecting hole, and the mirror group ball bearings are in rolling contact with the first rolling groove; the driving guide member includes a driving guide rod and a driving ball bearing which are disposed in parallel with each other, and the driving ball bearings include a plurality of ball bearings disposed along the optical axis direction of the camera module; a second connecting hole adapted to the driving guide rod and a second rolling groove adapted to the driving ball bearing are respectively provided on the moving part of the zoom driving device, the driving guide rod is passed through the second connecting hole, and the driving ball bearings are in rolling contact with the second rolling groove; wherein, the mirror group guide rod and the driving guide rod are arranged on the same side of the zoom mirror group assembly.

[0058] A relief groove is provided on one side of the movable portion 212 close to the zoom lens group assembly 11 , and the zoom lens group assembly 11 is partially or completely accommodated in the relief groove, making the structure of the camera module more compact and achieving a thinner and lighter camera module.

[0059] It is easy to understand that the housing can be designed into various shapes and structures as needed. For example, the housing can be a rectangular parallelepiped structure, and multiple mirror group components and drive devices are installed in the housing to form a rectangular parallelepiped structure (see Figure 2 ); or the shell may be cylindrical, etc.

[0060] Because it is difficult to achieve complete parallelism between the drive guide rod and the lens group guide rod during assembly, there will always be non-parallel tolerances. Or, when the camera module is subjected to an impact, the drive guide rod and the lens group guide rod may become non-parallel, which can easily cause the drive device to become stuck while driving the zoom lens group assembly 11 during a long-stroke zooming process. Therefore, it is necessary to decouple the movement of the moving part and the zoom lens group assembly in the non-optical axis direction. In other words, the transmission assembly of the drive device only transmits the driving force generated by the drive device in the optical axis direction to the zoom lens group assembly, absorbing the non-parallel tolerances between the drive guide rod and the lens group guide rod, ensuring that the zoom lens group assembly moves smoothly along the optical axis, and achieving a better automatic zoom effect of the camera module.

[0061] See also Figure 3 and Figure 4 The transmission assembly 60 can be set on one side of the zoom lens group assembly 11. The transmission assembly 60 transmits the driving force generated by the driving device in the optical axis direction to the zoom lens group assembly 11, driving the zoom lens group assembly 11 to reciprocate in the optical axis direction.

[0062] It is easy to understand that Figure 3 and Figure 4 The number and location of the transmission assembly 60 are merely examples and do not constitute a limitation. The transmission assembly 60 can be located on any side of the zoom lens group assembly 11. There can also be multiple transmission assemblies 60, which are spaced apart and located on one side of the zoom lens group assembly 11.

[0063] In one example, the transmission assembly 60 includes a connecting arm, a connecting rod, and a connecting portion. The connecting arm is disposed on the moving portion, which is disposed on the zoom lens group assembly. The connecting rod connects the connecting arm and the connecting portion to achieve a transmission connection between the moving portion and the zoom lens group assembly. The moving portion transmits a driving force to the zoom lens group assembly via the transmission component formed by the connecting arm, the connecting rod, and the connecting portion, thereby driving the zoom lens group assembly to move.

[0064] For example, Figure 5 and Figure 6As shown, the connecting arm 61 is provided at one end of the moving portion 212 extending in the direction of the optical axis, and the connecting arm 61 partially or completely extends out of the moving portion 212, and the extending direction of the portion of the connecting arm 61 extending out of the moving portion 212 is consistent with the direction of the optical axis. An elastic structure 610 is provided on the portion of the connecting arm 61 extending out of the moving portion 212, and one end of the connecting rod 62 is fixedly provided on the elastic structure 610. Figure 7 As shown, a connecting portion 63 is provided on one end of the zoom lens group assembly 11 close to the movable portion 212, corresponding to the position where the connecting arm 61 is provided on the movable portion 212. The connecting portion 63 partially or completely extends out of the zoom lens group assembly 11 in the direction of the optical axis. The extending direction of the portion of the connecting portion 63 extending out of the zoom lens group assembly 11 is consistent with the direction of the optical axis. A positioning hole 631 is provided on the portion of the connecting portion 63 extending out of the zoom lens group assembly 11, corresponding to the elastic structure 610. Figure 8 As shown, the other end of the connecting rod 62 in its extension direction is passed through the positioning hole 62; the elastic structure can produce elastic deformation in the extension direction of the connecting rod 62 to absorb the non-parallel tolerance of the driving guide rod and the zoom lens group in this direction, and the elastic structure has rigidity in the optical axis direction to transmit the driving force of the driving device to the zoom lens group assembly 11 in a timely manner.

[0065] In one example, see Figure 8 The elastic structure is a curved raised structure 612 on the connecting arm 61. The connecting arm 61 includes a straight portion 611 and the curved raised structure 612. The connecting rod 62 is fixedly mounted on the top of the curved raised structure 612. When the top of the curved raised structure 612 is subjected to downward pressure or upward tension from the connecting rod 62, the curved raised structure 612 undergoes elastic deformation, causing the top of the curved raised structure 612 to move between the top of the curved raised structure 612 and the plane of the straight portion 611. This allows for the non-parallel tolerance between the drive guide rod and the zoom lens group assembly in the direction in which the connecting rod extends.

[0066] certainly, Figure 8 The arc-shaped raised structure 612 is merely an example of an achievable elastic structure and does not constitute a limitation on the elastic structure. Other elastic structures that meet the requirements may also be used. For example, the elastic structure may be composed of a rigid bracket and an elastic structure. The rigid bracket is fixedly connected to the connecting arm at one end in the extension direction, and the other end is disposed near the positioning hole. The rigid bracket includes an accommodating cavity with an opening, and the elastic structure is disposed within the accommodating cavity. The open end of the rigid bracket is disposed toward the positioning hole, and the bottom of the connecting rod is fixedly connected to the elastic structure. When the driving guide rod and the zoom lens group assembly have a non-parallel tolerance in the extension direction of the connecting rod, the elastic structure undergoes elastic deformation to absorb the non-parallel tolerance. The rigid bracket and the connecting rod transmit the driving force of the driving device to the zoom lens group assembly. Optionally, the elastic structure may be an elastomer or a spring structure.

[0067] In one example, a limiting structure is provided on the outer wall surface of the connecting rod 62, and the limiting structure protrudes from the outer wall surface of the connecting rod. The outer wall surface of the limiting structure abuts against the connecting portion 63 to limit the length of the connecting rod 62 passing through the positioning hole 631, so as to facilitate the assembly of the connecting rod and the positioning hole. When the limiting structure of the connecting rod abuts against the lower wall surface of the connecting portion 63, it means that the connecting rod and the positioning hole are installed in place.

[0068] For example, the limiting structure is a conical protrusion structure 621 on the outer wall of the connecting rod 62, and the cross-sectional area of ​​the conical protrusion structure 621 gradually increases from the end close to the connecting portion 63 to the end close to the connecting arm 61 (see Figure 8 ).

[0069] In other examples, the limiting structure can also be other structures. For example, the limiting structure can be a stop portion provided on the outer wall surface of the connecting rod, and the upper wall surface of the stop portion abuts against the lower wall surface of the connecting portion to limit the length of the connecting rod extending into the positioning hole; or the limiting structure can be a step structure protruding from the outer wall surface of the connecting rod, and the upper wall surface of the step structure abuts against the lower wall surface of the connecting portion to limit the length of the connecting rod extending into the positioning hole.

[0070] In one example, in order to ensure that the driving device drives the zoom lens group assembly without delay, the connecting rod 62 extends into the outer wall surface of the positioning hole 631 and tightly abuts against the inner wall surface of the positioning hole 631 in the optical axis direction, so as to transmit the driving force of the driving device in the optical axis direction to the zoom lens group assembly without delay.

[0071] In another example, see Figure 9 The positioning hole 631 is a waist-shaped hole, and the extension direction of the waist-shaped hole is perpendicular to the direction of the optical axis. The connecting rod 62 slides with the waist-shaped hole in the extension direction of the waist-shaped hole to decouple the movement of the driving device and the zoom lens group assembly in this direction. The connecting rod 62 slides in the extension direction of the waist-shaped hole to absorb the tolerance between the driving guide rod and the lens group guide rod in this direction.

[0072] In another example, the camera module also has an autofocus function, see Figure 1-Figure 3 The multiple lens group assemblies further include a lens group assembly 12 having a focusing function. The driving device further includes a driving device 22 for driving the focusing lens group assembly 12 to move along the optical axis. The driving device 22 further includes a transmission assembly 60 for connecting the moving portion 222 and the focusing lens group assembly 12. The assembly of the transmission assembly 60 with the moving portion 222 and the focusing lens group assembly 12 is similar to the assembly of the transmission assembly 60 with the moving portion 212 and the zoom lens group assembly 11 described above. For the sake of brevity, please refer to the above description and will not be repeated here.

[0073] There can be multiple types of driving devices mentioned above, for example, the driving device can be a voice coil motor, a stepper motor, a piezoelectric motor, an SMA motor, etc. A suitable driving device can be selected according to actual conditions. This application does not limit the type of driving device.

[0074] The zoom drive device and the focus drive device can select the same drive device, for example, the zoom drive device and the focus drive device are both voice coil motors; the zoom drive device and the focus drive device can also select different drive devices, for example, the zoom drive device is a voice coil motor and the focus drive device is a stepping motor.

[0075] Exemplarily, both the zoom drive device and the focus drive device are voice coil motors. A first coil / first magnetic body is disposed on the drive portion of the zoom drive device, and a first magnetic body / first coil is disposed on the movable portion of the zoom drive device. A second coil / second magnetic body is disposed on the drive portion of the focus drive device, and a second magnetic body / second coil is disposed on the movable portion of the focus drive device. The first magnetic body and the second magnetic body are magnetic metals, such as an alloy composed of at least two of iron, cobalt, and nickel. A winding groove is disposed on the drive portion or the movable portion, and the first coil or the second coil is wound around the winding groove of the drive portion or the movable portion.

[0076] When the camera module needs to automatically zoom, the first coil is energized, and a Lorentz force is generated between the first coil and the first magnetic body. The moving part of the zoom drive device moves under the action of the Lorentz force, and then drives the zoom lens group assembly to move along the optical axis through the transmission device to achieve automatic zoom.

[0077] When the camera module automatically focuses, the second coil is energized, and a Lorentz force is generated between the second coil and the second magnetic body. The moving part of the focus drive device moves under the action of the Lorentz force, and then drives the focusing lens group assembly along the optical axis through the transmission device to achieve automatic focusing, making the taken photos or videos clearer.

[0078] An embodiment of the present application also provides an electronic device having the above-mentioned camera module.

[0079] Since the electronic device is equipped with the above-mentioned camera module, the driving device can accurately drive the zoom lens group and focus lens group of the camera module, thereby achieving good zoom and focus effects of the camera module, thereby enabling the electronic device to have high-quality shooting effects.

[0080] Electronic devices include but are not limited to mobile phones, tablet computers, wearable devices, laptop computers, ultra-mobile personal computers (UMPCs), handheld computers, personal digital assistants (PDAs), driving recorders, virtual reality devices, and other electronic devices with camera functions.

[0081] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and do not limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A driving device, applied to a camera module, wherein the camera module comprises a plurality of lens group components; characterized in that: include: A driving unit, for providing driving force; A moving part, which moves along the optical axis direction of the camera module under the action of the driving force; a transmission assembly for transmitting and connecting the moving portion and at least one of the plurality of mirror group assemblies, so that the relative positions of the moving portion and the at least one mirror group assembly in the optical axis direction of the camera module are fixed, while being able to move relative to each other in other directions; The transmission assembly comprises: A connecting arm, extending in the same direction as the optical axis of the camera module, with one end fixedly connected to the moving portion in the extending direction and the other end extending away from the moving portion; a connecting portion, arranged corresponding to the connecting arm, one end of which is fixedly connected to the at least one mirror group component and provided with a positioning hole; A connecting rod, one end of which is fixedly connected to the connecting arm in its extending direction, and the other end of which is passed through the positioning hole; Wherein, an elastic structure is provided on the connecting arm, and the elastic structure can generate elastic deformation in the extending direction of the connecting rod, and one end of the connecting rod is fixedly connected to the elastic structure.

2. The driving device according to claim 1, characterized in that The elastic structure is an arc-shaped protrusion structure on the connecting arm; The connecting arm includes a straight portion and an arc-shaped raised structure. When the arc-shaped raised structure generates elastic deformation, the top of the arc-shaped raised structure can move between the plane where the straight portion is located and the top of the arc-shaped raised structure. One end of the connecting rod is fixedly arranged on the top of the arc-shaped raised structure.

3. The driving device according to claim 1, characterized in that A limiting structure is provided on the outer wall surface of the connecting rod, and the limiting structure protrudes from the outer wall surface of the connecting rod. The outer wall surface of the limiting structure abuts against the connecting portion to limit the length of the connecting rod passing through the positioning hole.

4. The driving device according to claim 3, characterized in that The limiting structure is a conical protrusion structure protruding from the outer wall surface of the connecting rod, and the cross-sectional area of ​​the conical protrusion structure gradually increases from an end close to the connecting portion to an end close to the connecting arm.

5. The driving device according to claim 1, characterized in that The outer wall surface of the connecting rod is in close contact with the inner wall surface of the positioning hole in the optical axis direction of the camera module.

6. The driving device according to any one of claims 1 to 5, characterized in that: The positioning hole is a waist-shaped hole, the extension direction of the waist-shaped hole is perpendicular to the optical axis direction of the camera module, and the connecting rod and the waist-shaped hole are slidably matched in the extension direction of the waist-shaped hole.

7. A camera module, characterized in that: include: Multiple mirror group components; At least one driving device according to any one of claims 1 to 6, configured to drive at least one of the plurality of mirror group assemblies to move along the optical axis of the camera module; At least one first guide member is extended along the optical axis direction of the camera module, and is used to guide the at least one lens group assembly to move along the optical axis direction of the camera module; At least one second guide member is extended along the optical axis direction of the camera module and is used to guide the moving part of the driving device to move along the optical axis direction of the camera module.

8. The camera module according to claim 7, wherein: The at least one first guide member includes two first guide rods arranged parallel to each other, the at least one mirror group assembly is provided with two first connecting holes adapted to the two first guide rods, the two first guide rods are passed through the two first connecting holes to achieve sliding engagement between the at least one mirror group assembly and the two first guide rods; The at least one second guide member includes two second guide rods arranged parallel to each other, and two second connecting holes adapted to the two second guide rods are provided on the moving part of the at least one driving device. The two second guide rods are passed through the two second connecting holes to realize sliding cooperation between the moving part of the at least one driving device and the two second guide rods.

9. The camera module according to claim 7, wherein: The at least one first guide member includes a first guide rod and a first rolling ball arranged parallel to each other, wherein the first rolling ball includes a plurality of rolling balls arranged along the optical axis direction of the camera module; the at least one lens group assembly is respectively provided with a first connecting hole adapted to the first guide rod and a first rolling groove adapted to the first rolling ball, the first guide rod is inserted into the first connecting hole, and the first ball is in rolling contact with the first rolling groove; The at least one second guide member includes a second guide rod and a second rolling ball arranged parallel to each other, and the second rolling ball includes a plurality of rolling balls arranged along the optical axis direction of the camera module; a second connecting hole adapted for the second guide rod and a second rolling groove adapted for the second rolling ball are respectively provided on the moving portion of the at least one driving device, the second guide rod is inserted into the second connecting hole, and the second ball is in rolling contact with the second rolling groove; Wherein, the first guide rod and the second guide rod are arranged on the same side of the at least one mirror group component.

10. The camera module according to claim 7, wherein: A groove structure is formed on a side of the moving portion of the at least one driving device close to the at least one mirror group component, and the at least one mirror group component is partially or completely placed in the groove structure.

11. The camera module according to any one of claims 7 to 10, characterized in that: The at least one lens group assembly includes a zoom lens group assembly and a focus lens group assembly; the at least one driving device includes a zoom driving device for driving the zoom lens group assembly to move and a focus driving device for driving the focus lens group assembly to move; The camera module also includes: The locking structure is used to lock the moving part of the zoom driving device when the zoom driving device stops working.

12. An electronic device, characterized in that: Comprising a camera module as described in any one of claims 7-11.

Images