CN114637123A

CN114637123A - Circuit board assembly and lens driving mechanism

Info

Publication number: CN114637123A
Application number: CN202210421503.0A
Authority: CN
Inventors: 彭坤; 林聪�; 刘富泉; 吕新科; 其他发明人请求不公开姓名
Original assignee: Henan Hozel Electronics Co Ltd
Current assignee: Henan Hozel Electronics Co Ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-06-17

Abstract

The invention discloses a circuit board assembly and a lens driving mechanism. The circuit board comprises a first part and a second part which are electrically connected with each other, the first part and the periphery of the anti-shake platform are arranged at intervals, and the second part is provided with an input end and is positioned outside the first part. The anti-shake platform is provided with the plurality of groups of coils and the imaging chip, the plurality of groups of coils are matched with the magnets on the frame to drive the anti-shake platform and the imaging chip to move along the direction vertical to the optical axis, and a method for driving the frame, the carrier and a lens in the carrier to move to prevent shaking in the prior art is replaced. In addition, but anti-shake platform sliding connection is to the base, and the base can provide the support for anti-shake platform at the in-process of motion, guarantees the stability of anti-shake platform motion.

Description

Circuit board assembly and lens driving mechanism

Technical Field

The invention relates to the field of optical drive, in particular to a circuit board assembly and a lens driving mechanism.

Background

With the development of technology, many electronic devices today have the function of taking pictures or recording videos. The use of these electronic devices is becoming more common and the design direction of these electronic devices is being developed to be more convenient and thinner to provide more choices for users.

In practice, the lens needs to be continuously focused in order to adapt to various scenes. In addition, the anti-shake lens is required to be prevented in the focusing or photographing process, so that the phenomenon that the lens and the imaging chip are offset to cause imaging cannot be positioned is avoided. In the prior art, a lens driving mechanism drives a lens to move so as to realize focusing and anti-shake effects, and the lens moving direction includes two mutually perpendicular directions along an optical axis direction and perpendicular to the optical axis, wherein the lens moves along the optical axis direction and is mainly used for focusing, and the lens moves along the perpendicular optical axis direction and is used for anti-shake. The conventional lens driving mechanism generally includes a housing, a frame, a carrier, an upper spring, a lower spring, a plurality of suspension wires, and a base, wherein the housing and the base cooperate to provide a receiving space for mounting the frame and the carrier. The frame is provided with a plurality of groups of magnets and an internal circuit, and the frame is also provided with a hollow structure for mounting a carrier. The carrier is used for installing the camera lens, and the carrier can movably be installed in the hollow structure of frame, and the carrier is equipped with a set of coil and is used for cooperating the magnetite on the frame with drive carrier and camera lens along optical axis direction motion. The upper spring is connected with the top of the frame and the carrier, and the lower spring is connected with the bottom of the frame and the carrier, and the upper spring and the lower spring can enable the frame and the carrier to be movably connected. In addition, the upper reed and the lower reed are also connected with an internal circuit of the frame, and the lower reed is also connected with the carrier coil. The suspension wires are connected with the internal circuit and the upper reed of the base and used for transmitting current on the base to the upper reed, and external current can be transmitted to the coil on the carrier from the internal circuit of the base, the suspension wires, the upper reed, the internal circuit of the frame and the lower reed in sequence. In addition, another two groups of coils are arranged on the base, the two groups of coils can be matched with the magnets on the frame to drive the carrier and the lens to move along the direction vertical to the optical axis, when the lens shakes, namely the lens deviates from the imaging chip, the two groups of coils are matched with the magnets on the frame to drive the carrier and the lens to move along the direction vertical to the optical axis, and the lens is aligned with the imaging chip along the optical axis.

In the prior art, two problems exist, one of them is that the current on the carrier needs to pass through the inside of the base, the suspension wire, the upper spring, the inside of the frame and the lower spring to the coil of the carrier, the circuit is long and unstable, and the circuit is easy to break. Another problem is that the prior art prevents the lens from shaking by driving the carrier and the frame to move in the direction perpendicular to the optical axis, and the frame, the carrier and the lens are relatively elastically connected, so that the displacement of the lens movement is not easily controlled during the driving of the frame, the carrier and the lens.

Disclosure of Invention

An object of the present invention is to provide a circuit board assembly and a lens driving mechanism to solve the above-mentioned problems in the prior art.

In order to solve the above problems, according to an aspect of the present invention, there is provided a circuit board assembly of a lens driving mechanism, the lens driving mechanism including a motor, the motor including a carrier and a frame, the frame being provided with a plurality of sets of magnets, the carrier being configured to mount a lens and being mounted in the frame, the circuit board assembly including:

anti-shake platform, anti-shake platform extends along perpendicular to optical axis direction, be equipped with imaging chip and multiunit coil on the anti-shake platform, the multiunit coil is used for the cooperation the magnetite is with the drive anti-shake platform moves along perpendicular to optical axis direction, and makes imaging chip follow optical axis direction with the camera lens aligns, imaging chip be used for with light that the camera lens transmitted images

The circuit board comprises a first part and a second part which are electrically connected with each other, the first part is cylindrical and is sleeved outside the anti-shake platform, the first part and the periphery of the anti-shake platform are arranged at intervals, and the first part is electrically connected with the imaging chip on the anti-shake platform; the second portion has an input end and the second portion is located outside the first portion.

In one embodiment, the anti-shake platform is rectangular, and the first portion is rectangular and cylindrical.

In one embodiment, the anti-shake platform has an internal circuit, the imaging chip is connected to the internal circuit, and the anti-shake platform is located at the bottom of the first portion.

In one embodiment, the bottom of the first portion is provided with a connecting portion extending towards the inside, and the connecting portion is electrically connected with the internal circuit of the anti-shake platform.

In one embodiment, a driving circuit board is further arranged on the top of the anti-shake platform, the driving circuit board is electrically connected with an internal circuit in the anti-shake platform, and the plurality of groups of coils are located on the driving circuit board;

the driving circuit board is further provided with a hollow part, the hollow part is aligned with the imaging chip along the optical axis direction, and the hollow part is used for avoiding light rays transmitted to the imaging chip by the lens.

In one embodiment, the number of the coils is four, the driving circuit board is a rectangular board, and the four groups of the coils are respectively located at four corners of the driving circuit board.

In one embodiment, the top surface of the anti-shake platform is provided with a plurality of connecting columns, and the driving circuit board is provided with a plurality of connecting holes matched with the connecting columns.

In one embodiment, the top surface of the anti-shake platform is provided with a recess, the recess is located in the center of the anti-shake platform, and the recess is used for mounting the imaging chip.

In one embodiment, the second portion is connected to the bottom of the first portion.

In one embodiment, the second portion extends in a direction perpendicular to the optical axis.

The present invention also relates to a lens driving mechanism, comprising:

a housing;

the shell and the base are matched to form an accommodating space, and the top surface of the base is provided with a plurality of ball grooves;

a plurality of balls respectively located in the plurality of ball grooves

In the above circuit board assembly, the circuit board assembly is mounted in the accommodating space, the first portion of the circuit board is connected to the top surface of the base, the bottom of the anti-shake platform is provided with a plurality of grooves, the balls are respectively located in the grooves, and the anti-shake platform is slidably connected to the top surface of the base through the grooves and the balls;

the motor is arranged in the first part and comprises a shell, a frame and a carrier, the shell is positioned in the first part and connected with the top surface of the base, a plurality of groups of magnets are arranged on the frame and arranged in the shell, a metal frame is arranged in the frame and electrically connected with the second part of the circuit board, the frame is provided with a central hole, and the carrier can be movably arranged in the central hole;

the reed is connected with the anti-shake platform and the base and can be used for resetting the anti-shake platform;

the anti-shake platform is movably arranged in the shell and is positioned below the frame.

The anti-shake platform is provided with the plurality of groups of coils and the imaging chip, the plurality of groups of coils are matched with the magnets on the frame to drive the anti-shake platform and the imaging chip to move along the direction vertical to the optical axis, and a method for driving the frame, the carrier and a lens in the carrier to move to prevent shaking in the prior art is replaced. In addition, but anti-shake platform sliding connection is to the base, and the base can provide the support for anti-shake platform at the in-process of motion, guarantees the stability of anti-shake platform motion.

Drawings

Fig. 1 is an exploded view of a lens driving mechanism according to an embodiment of the present invention.

Fig. 2 is an assembly diagram of a circuit board assembly and a chassis in the embodiment shown in fig. 1.

Fig. 3 and 4 are perspective views of the circuit board assembly in the embodiment shown in fig. 1.

Fig. 5 is a perspective view of the circuit board assembly, motor, base and housing of the embodiment of fig. 1.

Reference numerals: 100. a lens driving mechanism; 1. a circuit board assembly; 11. an anti-shake platform; 111. a coil; 112. an imaging chip; 113. a recessed portion; 114. a groove; 12. a circuit board; 121. a first portion; 1211. a connecting portion; 122. a second portion; 13. a drive circuit board; 131. a hollow part; 132. connecting holes; 14. connecting columns; 2. a housing; 3. a motor; 31. a connecting end; 4. a reed; 5. a ball bearing; 6. a base; 61. a ball groove.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment can be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

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

In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.

The present invention relates to a lens driving mechanism 100, and as shown in fig. 1, 2 and 3, the lens driving mechanism 100 includes a housing 2, a base 6, a plurality of balls 5, a circuit board assembly 1, a spring 4 and a motor 3. Wherein, the top surface of base 6 is equipped with a plurality of ball grooves 61, and shell 2 connects in the top surface of base 6 and forms accommodation space with base 6 cooperation for hold circuit board assembly 1 and motor 3. The plurality of balls 5 are respectively mounted in the plurality of ball grooves 61. The circuit board assembly 1 includes an anti-shake platform 11 and a circuit board 12, the anti-shake platform 11 extends along the optical axis direction, and is provided with an imaging chip 112 and a plurality of coils 111, and the bottom of the anti-shake platform 11 is provided with a plurality of grooves 114, the plurality of grooves 114 and the plurality of ball grooves 61 are arranged relatively, the plurality of balls 5 are also simultaneously located in the plurality of grooves 114, that is, the plurality of balls 5 are respectively located in the plurality of ball grooves 61 and the plurality of grooves 114, and the anti-shake platform 11 can be connected to the top surface of the base 6 by the plurality of grooves 114 in a sliding manner in cooperation with the plurality of balls 5. The circuit board 12 includes a cylindrical first portion 121 and a second portion 122 connected to the outside of the first portion 121, and the first portion 121 is connected to the top surface of the base 6 and surrounds the outside of the motor 3.

The motor 3 comprises a housing, a frame and a carrier, wherein the housing is positioned in the first part 121 and connected with the top surface of the base 6, the frame is arranged in the housing and provided with a plurality of groups of magnets, and in addition, a metal frame is embedded in the frame and electrically connected with the second part 122 of the circuit board 12. In addition, the frame has a central hole. The carrier is movably mounted in the central hole. The anti-shake platform 11 is movably installed in the housing and located below the frame. The reed 4 is connected with the anti-shake platform 11 and the base 6, the reed 4 has elasticity, and after the anti-shake platform 11 moves in the direction perpendicular to the optical axis, the reed 4 can enable the anti-shake platform 11 to reset.

The anti-shake platform 11 of the invention is provided with a plurality of groups of coils 111 and imaging chips 112, the plurality of groups of coils 111 cooperate with the magnets on the frame to drive the anti-shake platform 11 and the imaging chips 112 to move along the direction vertical to the optical axis, thereby replacing the prior method of driving the frame, the carrier and the lens in the carrier to move for anti-shake, and because the anti-shake platform 11 and the imaging chips 112 have small volumes, the distance of the movement of the imaging chips 112 can be accurately controlled. In addition, but anti-shake platform 11 sliding connection is to base 6, and base 6 can provide the support for anti-shake platform 11 in the in-process of motion, guarantees the stability of anti-shake platform 11 motion.

Fig. 2 is an assembly view of a circuit board assembly and a base in the embodiment shown in fig. 1, and fig. 3 and 4 are perspective views of the circuit board assembly 1 in an embodiment of the present invention, as shown in fig. 2, 3 and 4, the anti-shake platform 11 extends in a direction perpendicular to the optical axis, and the imaging chip 112 and the plurality of sets of coils 111 are located on the top surface of the anti-shake platform 11. The imaging chip 112 can be used for imaging light transmitted by the lens, and in the shooting process, when the lens shakes, the multiple groups of coils 111 are used for matching with the magnets on the frame to drive the anti-shake platform 11 to move along the direction perpendicular to the optical axis, so that the imaging chip 112 is aligned with the lens along the optical axis direction, and the imaging chip 112 can stably sense the light of the lens. The circuit board 12 includes a first portion 121 and a second portion 122 electrically connected to each other, the first portion 121 is cylindrical and is sleeved outside the anti-shake platform 11, the first portion 121 and the anti-shake platform 11 are arranged at intervals around the outer circumference thereof, the first portion 121 is electrically connected to the imaging chip 112 and the plurality of sets of coils 111 on the anti-shake platform 11, and can supply power to the imaging chip 112 and the plurality of sets of coils 111, the second portion 122 has an input end, the second portion 122 is located outside the first portion 121, the input end of the second portion 122 can be connected to an external power supply, and current can sequentially flow through the second portion 122, the first portion 121, the imaging chip 112 of the anti-shake platform 11, and the plurality of sets of coils 111. In addition, the first portion 121 is installed on the top surface of the base 6, the anti-shake platform 11 is connected to the first portion 121, the anti-shake platform 11 drives the first portion 121 to move along the direction perpendicular to the optical axis in the process of moving along the direction perpendicular to the optical axis, the first portion 121 touches the housing in the process of moving, and the housing can reset the first portion 121, so that the anti-shake platform 11 resets. Moreover, the anti-shake platform 11 is connected with the base 6 through the reed 4, the reed 4 has elasticity, the anti-shake platform 11 can be close to the base 6, and the anti-shake platform 11 can also be reset.

Alternatively, the anti-shake platform 11 is rectangular and has four sides, the first part 121 is rectangular and cylindrical and has four side frames, one of the four sides of the anti-shake platform 11 is connected to the bottom of one side frame of the first part 121 near the middle, and the side of the anti-shake platform 11 and the other side frames of the first part 121 are spaced apart, so that the anti-shake platform 11 is movable in the first part 121.

Optionally, the anti-shake platform 11 is connected to the bottom of the first portion 121 and has an internal circuit, the internal circuit of the anti-shake platform 11 is electrically connected to the first portion 121, the imaging chip 112 and the plurality of sets of coils 111 are electrically connected to the internal circuit of the anti-shake platform 11, and the current flows through the first portion 121 and the internal circuit of the anti-shake platform 11 to the imaging chip 112 and the plurality of sets of coils 111. In addition, a plurality of sensors are further disposed on the anti-shake platform 11, and the plurality of sensors can be used for sensing the position of the imaging chip 112 during the movement process.

Optionally, the bottom of the first portion 121 is provided with a connecting portion 1211 extending towards the inside, and the connecting portion 1211 is electrically connected to the internal circuit of the anti-shake platform 11. In the embodiment of fig. 3 and 4, two connecting portions 1211 are provided, and the two connecting portions 1211 are spaced apart and located at the same side of the first portion 121. In the process of moving the anti-shake platform 11, the connection portion 1211 can drive the first part 121 to move, the time of the movement of the first part 121 has a certain delay, the first part 121 touches the housing after moving, the first part 121 can be reset by the reverse force applied to the first part 121 by the housing, and the connection portion 1211 and the anti-shake platform 11 can be reset in the process of resetting the first part 121.

Optionally, a driving circuit board 1312 is further disposed on the top of the anti-shake platform 11, the driving circuit board 1312 is electrically connected to the internal circuit inside the anti-shake platform 11, and the plurality of sets of coils 111 are located on the driving circuit board 1312. As shown in fig. 1 and 2, the driving circuit board 1312 is rectangular, the driving circuit board 1312 is connected to the top surface of the anti-shake platform 11, and the plurality of sets of coils 111 are located on the top surface of the driving circuit board 1312. Note that the sensor may be provided on the drive circuit board 1312. Alternatively, the coils 111 may be directly provided on the anti-shake table 11.

Further, the driving circuit board 1312 is ring-shaped and is provided with a hollow portion 131, the hollow portion 131 is aligned with the imaging chip 112 along the optical axis direction, and the hollow portion 131 is used for avoiding the light rays transmitted from the lens to the imaging chip 112. The hollow portion 131 needs to have a size large enough to prevent the transmission of light from being affected, and the size of the hollow portion 131 is designed according to actual needs. In addition, it should be understood that the driving circuit board 1312 may also be a flat board, and the driving circuit board 1312 may be disposed at the bottom of the anti-shake platform 11 and may not block the light from the lens from being transmitted to the imaging chip 112.

Alternatively, the number of coils 111 is four, the driving circuit board 1312 is a rectangular plate, and the four groups of coils 111 are respectively located at four corners of the driving circuit board 1312. It should be understood that the four sets of coils 111 may be disposed at other positions on the driving circuit board 1312 as long as the magnet of the mating frame can drive the anti-shake table 11 to move along the optical axis direction.

Alternatively, as shown in fig. 3, the top surface of the anti-shake platform 11 is provided with a plurality of connection posts 14, the driving circuit board 1312 is provided with a connection hole 132 for matching with the plurality of connection posts 14, and the driving circuit board 1312 can be connected to the top surface of the anti-shake platform 11 through the connection hole 132 and the connection posts 14. It should be understood that the driving circuit board 1312 may be connected to the anti-shake platform 11 in other ways, and is not limited to the embodiment shown in fig. 2.

Optionally, the top surface of the anti-shake platform 11 is provided with a recess 113, the recess 113 is located at the center of the anti-shake platform 11, and the recess 113 is used for mounting the imaging chip 112. The position of the imaging chip 112 needs to be aligned with the lens on the carrier along the optical axis direction, and when the lens shakes, the lens and the imaging chip 112 shift, so that the imaging chip 112 cannot sense the light of the lens, and further cannot position for imaging. In the prior art, generally, the lens is driven to move along the direction perpendicular to the optical axis, so that the lens and the imaging chip 112 are aligned along the optical axis, but in the present invention, the imaging chip 112 is driven to move along the optical axis, so that on one hand, the moving distance of the imaging chip 112 can be precisely controlled, and on the other hand, the imaging chip 112 is arranged in the first portion 121, and can be directly connected with an external power supply through the circuit board 12, so that the circuit is stable.

Optionally, the second portion 122 is connected to the bottom of the first portion 121. In addition, as shown in fig. 5, the metal frame inside the frame has two connecting ends 31, and the two connecting ends 31 are located at the bottom of the second portion 122 and extend out of the frame, the two connecting ends 31 are electrically connected to the second portion 122, and the current of the second portion 122 can flow into the metal frame.

Optionally, the second portion 122 extends in a direction perpendicular to the optical axis. It should be understood that the shape of the second portion 122 or the position relationship with the first portion 121 can be set according to the matching of the external components, and is not limited to the embodiment of fig. 1 and 2.

The anti-shake platform 11 of the invention is provided with a plurality of groups of coils 111 and imaging chips 112, the plurality of groups of coils 111 cooperate with the magnets on the frame to drive the anti-shake platform 11 and the imaging chips 112 to move along the direction vertical to the optical axis, thereby replacing the prior method of driving the frame, the carrier and the lens in the carrier to move for anti-shake, and because the anti-shake platform 11 and the imaging chips 112 have small volumes, the distance of the movement of the imaging chips 112 can be accurately controlled. But anti-shake platform 11 passes through ball 5 sliding connection to base 6, and base 6 can provide the support for anti-shake platform 11 at the in-process of motion, guarantees the stable form of 11 motions of anti-shake platform. The anti-shake platform 11 and the base 6 are also connected through the reeds 4, and the reeds 4 can enable the anti-shake platform 11 to reset after movement. The first part 121 of the circuit board 12 is cylindrical, the anti-shake platform 11 is connected to the first part 121 and can be movably installed in the first part 121, the motor 3 is also installed in the first part 121, the housing of the motor 3 and the first part 121 are arranged at intervals, in the moving process, the anti-shake platform 11 can drive the first part 121 to move, the first part 121 can touch the housing to reset, and then the reed 4 is assisted to drive the anti-shake platform 11 to reset.

While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the invention can be effected therein by those skilled in the art after reading the above teachings of the invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. The utility model provides a lens actuating mechanism's circuit board assembly, lens actuating mechanism includes the motor, the motor includes carrier and frame, be equipped with the multiunit magnetite on the frame, the carrier be used for installing the camera lens and install in the frame, its characterized in that includes:

anti-shake platform, anti-shake platform extends along perpendicular to optical axis direction, be equipped with imaging chip and multiunit coil on the anti-shake platform, multiunit coil is used for the cooperation the magnetite is with the drive anti-shake platform moves along perpendicular to optical axis direction, and makes imaging chip along optical axis direction with the camera lens aligns, imaging chip be used for with light that the camera lens transmitted images

2. The circuit board assembly of claim 1, wherein the anti-shake platform is rectangular and the first portion is rectangular cylindrical.

3. The circuit board assembly of claim 1, wherein the anti-shake platform has internal circuitry, the imaging chip is connected to the internal circuitry, and the anti-shake platform is located at a bottom of the first portion.

4. A circuit board assembly according to claim 3, wherein the bottom of the first portion is provided with a connecting portion extending towards the inside, the connecting portion electrically connecting the internal circuitry of the anti-shake platform.

5. The circuit board assembly according to claim 3, wherein a driving circuit board is further disposed on the top of the anti-shake platform, the driving circuit board is electrically connected to internal circuits in the anti-shake platform, and the plurality of sets of coils are disposed on the driving circuit board;

6. The circuit board assembly of claim 5, wherein the number of the coils is four, the driving circuit board is a rectangular board, and the four sets of the coils are respectively located at four corners of the driving circuit board.

7. The circuit board assembly according to claim 5, wherein the anti-shake platform has a plurality of connection posts on a top surface thereof, and the driving circuit board has connection holes for engaging the plurality of connection posts.

8. The circuit board assembly of claim 2, wherein the top surface of the anti-shake platform is provided with a recess, the recess is located at the center of the anti-shake platform, and the recess is used for mounting the imaging chip.

9. The circuit board assembly of claim 1, wherein the second portion is connected to a bottom of the first portion.

10. The circuit board assembly of claim 1, wherein the second portion extends in a direction perpendicular to the optical axis.

11. A lens driving mechanism, comprising:

a housing;

a plurality of balls respectively located in the plurality of ball grooves

The circuit board assembly of any one of claims 1-10, wherein the circuit board assembly is mounted in the accommodating space, and the first portion of the circuit board is connected to the top surface of the base, the bottom of the anti-shake platform is provided with a plurality of grooves, a plurality of balls are respectively located in the plurality of grooves, and the anti-shake platform is slidably connected to the top surface of the base through the plurality of grooves and the plurality of balls;