Image sensor driving apparatus

Abstract

The present invention relates to a driving apparatus, and in particular to an image sensor driving apparatus, comprising a housing, an elastic support assembly, an image sensor assembly, a driving coil, and steel magnets. The elastic support assembly comprises a first circuit board, a second circuit board arranged around the periphery of the first circuit board and electrically connected to the first circuit board, and an elastic member fixed to the housing. The second circuit board is opposite to and spaced apart from the steel magnets, and the driving coil is formed on the second circuit board by means of additive manufacturing or etching. Compared with the prior art, in the present invention, the driving coil is fixed in the elastic support assembly by means of additive manufacturing or etching, so that no independent wire arrangement and placement process is required, the assembly process is effectively simplified and costs are reduced, and the stacking space in the optical axis of an image sensor is saved, which is beneficial for magnetic circuit design and facilitates improving a BL value; due to the design in which the driving coil is fixed in the elastic support assembly by means of additive manufacturing or etching, the weight of the driving coil is effectively reduced, and the moving mass of the driving coil is about 10% lower than that of a voice coil.

Description

An image sensor driving device Technical Field

[0001] This utility model relates to a driving device, and more particularly to an image sensor driving device. Background Technology

[0002] With the development of camera technology, image sensor driving devices are widely used in various camera devices. The integration of image sensor driving devices with various portable electronic devices such as mobile phones, camcorders, and computers is particularly favored by consumers. Technical issues

[0003] Currently, there are three physical driving methods for lens modules: spring type, ball type, and shape memory alloy type. However, the cost of spring type, ball type, or shape memory alloy type is relatively high. At the same time, when the voice coil is stacked and soldered to the PCB board / FPC board along the optical axis of the image sensor, the stacking space is relatively high, which is not conducive to magnetic circuit design.

[0004] Therefore, it is necessary to provide a new image sensor driving device to solve the above-mentioned technical problems. Technical solutions

[0005] This invention provides an image sensor driving device, which aims to solve the problem of excessively high cost of existing image sensor driving devices.

[0006] The image sensor driving device includes:

[0007] A housing having a receiving space and a through hole connecting the receiving space to the outside;

[0008] An image sensor assembly, wherein the image sensor assembly is housed within the housing space and faces the through-hole;

[0009] An elastic support assembly is fixed to the inside of the housing and suspends the image sensor assembly within the receiving space;

[0010] A drive coil, the drive coil being fixed to the image sensor assembly; and,

[0011] A magnet is fixed to the housing and spaced apart from the drive coil; the drive coil interacts with the magnet and drives the elastic support assembly to move along the optical axis perpendicular to the image sensor assembly, thereby causing the image sensor assembly to move synchronously. The feature is that...

[0012] The image sensor assembly includes a first circuit board, a second circuit board disposed around the outer periphery of the first circuit board and fixed to and electrically connected to the first circuit board, and an image sensor body fixed to the first circuit board.

[0013] The second circuit board is opposite to and spaced apart from the magnet. The drive coil is formed on the second circuit board by additive manufacturing or etching and is electrically connected to the second circuit board. The drive coil includes multiple sub-coils. Each sub-coil includes multiple coil layers stacked on top of each other. The lines of the multiple coil layers are connected in series to form a terminal that is electrically connected to the lines of all the coil layers. The terminal is electrically connected to the second circuit board.

[0014] Preferably, the coil layer comprises a copper wire layer and an insulating layer.

[0015] Preferably, the second circuit board includes a plurality of sub-circuit boards that are spaced apart from each other, each sub-circuit board is fixed and electrically connected to the first circuit board, and each sub-circuit board has a sub-coil formed thereon.

[0016] Preferably, the first circuit board is rectangular, and the sub-circuit boards include four sub-circuit boards located at the four corners of the first circuit board respectively; each sub-circuit board includes a first segment, a second segment extending from the first segment by bending, and a third segment protruding from the connection between the first segment and the second segment. The first segment and the second segment are parallel to adjacent sides of the first circuit board, and both the first segment and the second segment have the sub-coil formed thereon. The third segment is fixed to the first circuit board.

[0017] Preferably, the image sensor assembly further includes a solder pad, two adjacent sub-circuit boards form a group of circuit boards, and two sub-circuit boards in the same group of circuit boards are provided with a solder pad at their respective ends that are close to each other, and both are electrically connected to the solder pad for lead wires.

[0018] Preferably, the image sensor driving device further includes two anti-collision blocks arranged opposite to each other, with one anti-collision block respectively provided at one end of each of the two sets of circuit boards that are close to each other, and both are fixedly connected to the anti-collision blocks.

[0019] Preferably, the image sensor driving device further includes a conductive component, one end of which is electrically connected to the first circuit board, and the other end of which is used to connect to an external device.

[0020] Preferably, the housing includes a bottom cover and an upper cover fixed to the bottom cover and together forming the receiving space, the through hole being formed in the upper cover; the magnet includes a first magnet fixed to the upper cover and a second magnet fixed to the bottom cover, the drive coil being sandwiched between the first magnet and the second magnet and spaced apart from both the first magnet and the second magnet; the elastic element is fixed to the bottom cover, and the anti-collision block is fixedly connected to the upper cover. Beneficial effects

[0021] Compared with the prior art, the image sensor driving device proposed in this utility model fixes the driving coil in the elastic support component by additive manufacturing or etching, thereby eliminating the need for a separate wire placement process, effectively simplifying the assembly process and reducing costs, and saving the stacking space along the optical axis of the image sensor, which is beneficial for magnetic circuit design to improve the BL value. Due to the design of fixing the driving coil in the elastic support component by additive manufacturing or etching, the weight of the driving coil is effectively reduced, and the moving mass is reduced by about 10% compared with the voice coil. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0023] Figure 1 is a three-dimensional structural schematic diagram of the image sensor driving device provided in an embodiment of the present invention;

[0024] Figure 2 is a cross-sectional view along line AA in Figure 1;

[0025] Figure 3 is a cross-sectional view along line BB in Figure 1;

[0026] Figure 4 is an exploded three-dimensional structural diagram of the image sensor driving device provided in an embodiment of the present invention.

[0027] Figure 5 is a schematic diagram of the sub-circuit board provided in an embodiment of this utility model;

[0028] Figure 6 is a schematic diagram of the multi-layer coil structure of the sub-coil provided in the embodiment of this utility model. Embodiments of the present invention

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] Referring to Figures 1 to 6, this embodiment of the present invention provides an image sensor driving device 100, which includes: a housing 1, an elastic support assembly 2, an image sensor assembly 3, a driving coil 4, and a magnet 5. The image sensor driving device 100 includes:

[0031] The system comprises: a housing 1 having a receiving space and a through hole 13 connecting the receiving space to the outside; an image sensor assembly 3 housed within the receiving space and facing the through hole 13; an elastic support assembly 2 fixed to the inside of the housing 1 and suspending the image sensor assembly 3 within the receiving space; a drive coil 4 fixed to the image sensor assembly 3; and a magnet 5 fixed to the housing 1 and spaced apart from the drive coil 4. The drive coil 4 interacts with the magnet 5 and drives the elastic support assembly 2 to move along a direction perpendicular to the optical axis of the image sensor assembly 3, thereby causing the image sensor assembly 3 to move synchronously.

[0032] The image sensor assembly includes a first circuit board 31, a second circuit board 32 disposed around the outer periphery of the first circuit board 31 and fixed to and electrically connected to the first circuit board 31, and an image sensor body 33 fixed to the first circuit board 31; the second circuit board 32 is opposite to the magnet 5 and spaced apart from it.

[0033] The driving coil 4 is formed on the second circuit board 32 by additive manufacturing or etching and is electrically connected to the second circuit board 32. The driving coil 4 includes multiple sub-coils 41, each of which includes multiple coil layers 411 stacked on top of each other. The lines of the multiple coil layers 411 are connected in series to form a terminal 42 electrically connected to the lines of all the coil layers 411. The terminal 42 is electrically connected to the second circuit board 32. The coil layer 411 includes a copper wire layer 4111 and an insulating layer 4112. Specifically, the magnet 5 interacts with the driving coil 4 to drive the image sensor module 3 to move along a first direction and a second direction that are perpendicular to each other, wherein the first direction, the second direction, and the optical axis direction are perpendicular to each other. It can be understood that in practical applications, the image sensor driving device 100 has a lens module arranged above its optical axis direction. When the image sensor module 3 moves in a plane perpendicular to the optical axis direction, it moves relative to the lens module, thus achieving optical image stabilization.

[0034] In this embodiment, the copper traces of the multiple copper wire layers 4111 are stacked together and separated by insulating layers 4112. It should be noted that the number of coil layers 411 can be adjusted according to actual requirements. In this embodiment, the second circuit board 32 includes multiple sub-circuit boards 321 that are spaced apart from each other. Each sub-circuit board 321 is fixed and electrically connected to the first circuit board 31, and each sub-circuit board 321 is provided with the driving coil 4.

[0035] In this embodiment, the image sensor assembly 3 further includes a welding piece 34. Two adjacent sub-circuit boards 321 form a set of circuit boards. Two sub-circuit boards 321 in the same set of circuit boards are provided with a welding piece 34 at their close ends, and both are electrically connected to the welding piece 34 for lead wires.

[0036] Specifically, multiple coil layers 411 of the sub-coil 41 are connected in series to form multiple terminals 42. All the internal circuitry of the multi-layered structure of the sub-coil 41 is led to the soldering plate 34, where they are soldered to the first circuit board 31. After connecting the circuitry of multiple coil layers 411 in series to form terminals 42, the leads are led to the soldering plate 34 for uniform soldering, ensuring a consistent contact surface material and effectively reducing the number of soldering operations. It should be noted that each coil layer 411 of each sub-coil 41 can also be individually configured.

[0037] In this embodiment, the first circuit board 31 is rectangular, and the sub-circuit boards 321 include four sub-circuit boards located at the four corners of the first circuit board 31. Each sub-circuit board 321 includes a first segment 3211, a second segment 3212 extending from the first segment 3211, and a third segment 3213 protruding from the connection between the first segment 3211 and the second segment 3212. The first segment 3211 and the second segment 3212 are parallel to the adjacent sides of the first circuit board 31, and both the first segment 3211 and the second segment 3212 have the sub-coil 41 formed thereon. The third segment 3213 is fixed to the first circuit board 31.

[0038] In this embodiment, the image sensor driving device 100 further includes a conductive element 6, one end of which is electrically connected to the first circuit board 31, and the other end of which is used to connect to an external device.

[0039] In this embodiment, the image sensor driving device 100 further includes two anti-collision blocks 7 arranged opposite to each other. One of the anti-collision blocks 7 is respectively arranged at one end of the two sets of circuit boards that are close to each other, and both are fixedly connected to the anti-collision blocks 7.

[0040] In this embodiment, the housing 1 includes a bottom cover 12 and an upper cover 11 fixed to the bottom cover 12 and together forming the receiving space; the through hole 13 is opened in the upper cover 11; the magnet 5 includes a first magnet 51 fixed to the upper cover 11 and a second magnet 52 fixed to the bottom cover 12; the drive coil 4 is sandwiched between the first magnet 51 and the second magnet 52, and is spaced apart from both the first magnet 51 and the second magnet 52; the elastic member 33 is fixed to the bottom cover 12; and the anti-collision block 7 is fixedly connected to the upper cover 11.

[0041] Compared with the prior art, the image sensor driving device proposed in this utility model fixes the driving coil in the elastic support component by additive manufacturing or etching, thereby eliminating the need for a separate wire placement process, effectively simplifying the assembly process and reducing costs, and saving the stacking space along the optical axis of the image sensor, which is beneficial for magnetic circuit design to improve the BL value. Due to the design of fixing the driving coil in the elastic support component by additive manufacturing or etching, the weight of the driving coil is effectively reduced, and the moving mass is reduced by about 10% compared with the voice coil.

[0042] The above description is merely an embodiment of this utility model. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this utility model, but these improvements all fall within the protection scope of this utility model.

Claims

1. An image sensor driving device, comprising: a housing having a receiving space and provided with a through hole for communicating the receiving space with the outside; an image sensor assembly received in the receiving space and opposite to the through hole; an elastic supporting assembly fixed to the inner side of the housing and suspending the image sensor assembly in the receiving space; a driving coil fixed to the image sensor assembly; and a magnetic steel fixed to the housing and opposite to the driving coil; the driving coil and the magnetic steel interact with each other and drive the elastic supporting assembly to move along the direction perpendicular to the optical axis of the image sensor assembly, so as to drive the image sensor assembly to move synchronously, characterized in that: the image sensor assembly comprises a first circuit board, a second circuit board arranged around the outer periphery of the first circuit board and fixed to and electrically connected with the first circuit board, and an image sensor body fixed to the first circuit board; the second circuit board is opposite to and spaced apart from the magnetic steel, the driving coil is formed on the second circuit board by additive or etching and electrically connected with the second circuit board, the driving coil comprises a plurality of sub-coils, each of the sub-coils comprises a plurality of coil layers stacked with each other, the circuits of the plurality of coil layers are connected in series with each other and form a terminal electrically connected with the circuits of all the coil layers, and the terminal is electrically connected with the second circuit board.

2. The image sensor driving device according to claim 1, wherein The coil layer comprises a copper wire layer and an insulating layer.

3. The image sensor driving device according to claim 1, wherein The second circuit board comprises a plurality of sub-circuit boards arranged at intervals, each of the sub-circuit boards is fixed to and electrically connected with the first circuit board, and each of the sub-circuit boards is formed with the sub-coil.

4. The image sensor driving device according to claim 3, wherein The first circuit board is rectangular, the sub-circuit boards comprise four sub-circuit boards respectively located at the four corners of the first circuit board; each of the sub-circuit boards comprises a first segment, a second segment bent and extended from the first segment, and a third segment protruding from the connection between the first segment and the second segment, the first segment and the second segment are parallel to two adjacent sides of the first circuit board respectively, the first segment and the second segment are both formed with the sub-coil, and the third segment is fixed to the first circuit board.

5. The image sensor driving device according to claim 4, wherein The image sensor assembly further comprises a soldering sheet, two adjacent sub-circuit boards form a group of circuit boards, one soldering sheet is arranged at the end of the two sub-circuit boards in the same group of circuit boards close to each other and electrically connected with the soldering sheet for lead wire.

6. The image sensor driving device according to claim 5, wherein The image sensor driving device further comprises two anti-collision blocks arranged oppositely, one anti-collision block is arranged at the end of two groups of circuit boards close to each other and fixedly connected with the anti-collision block.

7. The image sensor driving device according to claim 1, wherein The image sensor driving device further comprises a conductive member, one end of the conductive member is electrically connected with the first circuit board, and the other end of the conductive member is used for connecting external equipment.

8. The image sensor driving device according to claim 6, wherein The shell comprises a bottom cover and an upper cover fixed to the bottom cover and jointly enclosing the accommodating space, and the through hole is arranged on the upper cover; the magnetic steel comprises a first magnetic steel fixed to the upper cover and a second magnetic steel fixed to the bottom cover, the driving coil is arranged between the first magnetic steel and the second magnetic steel and is spaced from the first magnetic steel and the second magnetic steel; the elastic member is fixed to the bottom cover, and the anti-collision block is fixedly connected with the upper cover.

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