Image sensor driving device

Abstract

The utility model relates to a driving device, in particular to an image sensor driving device. Comprising a shell, an elastic supporting assembly, an image sensor assembly, a driving coil and magnetic steel, and the elastic supporting assembly comprises a first circuit board, a second circuit board arranged around the periphery of the first circuit board and fixed and electrically connected with the first circuit board, and an elastic piece fixed to the shell; the second circuit board and the magnetic steel face each other and are spaced from each other, and the driving coil is formed on the second circuit board through additive manufacturing or etching. Compared with the prior art, the driving coil is fixed in the elastic supporting assembly through material adding or etching, so that an independent wire arranging and placing process is not needed, the assembly process is effectively simplified, the assembly cost is effectively reduced, the stacking space along the optical axis direction of the image sensor is saved, the magnetic circuit design is facilitated, the BL value is improved, and the reliability of the image sensor is improved. Due to the design that materials are added or etched and fixed in the elastic supporting assembly, the weight of the driving coil is effectively reduced, and the motion mass is reduced by about 10% compared with that of a voice coil.

Description

Technical Field

[0001] The utility model relates to a driving device, in particular to an image sensor driving device. Background Art

[0002] With the development of camera technology, image sensor driving devices are widely used in various camera devices. The combination of image sensor driving devices and various portable electronic devices such as mobile phones, cameras, computers, etc. is even more popular among consumers.

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

[0004] Therefore, it is necessary to provide a new image sensor driving device to solve the above technical problems. Utility Model Content

[0005] The utility model provides an image sensor driving device, aiming to solve the problem of excessively high cost of the existing image sensor driving device.

[0006] The image sensor driving device comprises:

[0007] A shell having a receiving space and a through hole connecting the receiving space with the outside;

[0008] An image sensor assembly, the image sensor assembly is received in the receiving space and faces the through hole;

[0009] An elastic support assembly, the elastic support assembly is fixed to the inner side of the housing and suspends the image sensor assembly in the receiving space;

[0010] a driving coil, the driving coil being fixed to the image sensor assembly; and

[0011] A magnetic steel, the magnetic steel is fixed to the housing and is spaced apart from the driving coil; the driving coil interacts with the magnetic steel and drives the elastic support component to move along a direction perpendicular to the optical axis of the image sensor component, so as to drive the image sensor component to move synchronously, characterized in that:

[0012] The image sensor assembly includes a first circuit board, a second circuit board arranged around the 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 the magnetic steel and spaced from each other. 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 of which includes multiple coil layers stacked on each other. The circuits of the multiple coil layers are connected in series to form terminals electrically connected to the circuits of all the coil layers, and the terminals are 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 of the sub-circuit boards is fixed to and electrically connected to the first circuit board, and each of the sub-circuit boards is formed with the sub-coil.

[0016] Preferably, the first circuit board is rectangular, and the sub-circuit boards include four sub-circuit boards respectively located at the four corners of the first circuit board; each sub-circuit board includes a first section, a second section bent and extended from the first section, and a third section protruded from the connection between the first section and the second section, the first section and the second section are respectively parallel to two adjacent sides of the first circuit board, and the sub-coil is formed in both the first section and the second section, and the third section is fixed to the first circuit board.

[0017] Preferably, the image sensor assembly further includes a welding sheet, and two adjacent sub-circuit boards form a group of circuit boards. A welding sheet is provided at one end of two sub-circuit boards in the same group of circuit boards that are close to each other, and both are electrically connected to the welding sheet for lead-out.

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

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

[0020] Preferably, the shell includes a bottom cover and an upper cover fixed to the bottom cover and together forming the accommodating space, and the through hole is opened in the upper cover; the magnet includes a first magnet fixed to the upper cover and a second magnet fixed to the bottom cover, and the driving coil is clamped between the first magnet and the second magnet, and is spaced apart from both the first magnet and the second magnet; the elastic member is fixed to the bottom cover, and the anti-collision block is fixedly connected to the upper cover.

[0021] Compared with the prior art, the image sensor driving device proposed in the utility model fixes the driving coil in the elastic support component by additive or etching, thereby eliminating the need for a separate wire management and placement process, effectively simplifying the assembly process and cost, and saving stacking space along the optical axis direction of the image sensor, which is beneficial to the magnetic circuit design to improve the BL value. Due to the design of fixing the driving coil in the elastic support component by additive or etching, the weight of the driving coil is effectively reduced, and the motion mass is reduced by about 10% compared with the voice coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0023] Figure 1 A schematic diagram of the three-dimensional structure of an image sensor driving device provided by an embodiment of the utility model;

[0024] Figure 2 For along Figure 1 The cross-section diagram of the AA line;

[0025] Figure 3 For along Figure 1 Cross-sectional view of the middle BB line;

[0026] Figure 4 A schematic diagram of a three-dimensional structure decomposition of an image sensor driving device provided by an embodiment of the utility model;

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

[0028] Figure 6 A schematic diagram of a multi-layer coil structure of a sub-coil provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Combination Figures 1 to 6As shown, the embodiment of the utility model provides an image sensor driving device 100, and the image sensor driving device 100 includes: a housing 1, an elastic support component 2, an image sensor component 3, a driving coil 4 and a magnetic steel 5. The image sensor driving device 100 includes:

[0031] A shell 1, wherein the shell 1 has a receiving space and is provided with a through hole 13 connecting the receiving space with the outside; an image sensor component 3, wherein the image sensor component 3 is received in the receiving space and is opposite to the through hole 13; an elastic support component 2, wherein the elastic support component 2 is fixed to the inner side of the shell 1 and suspends the image sensor component 3 in the receiving space; a drive coil 4, wherein the drive coil 4 is fixed to the image sensor component 3; a magnet 5, wherein the magnet 5 is fixed to the shell 1 and is spaced apart from the drive coil 4; the drive coil 4 interacts with the magnet 5 and drives the elastic support component 2 to move along a direction perpendicular to the optical axis of the image sensor component 3, so as to drive the image sensor component 3 to move synchronously.

[0032] The image sensor assembly includes a first circuit board 31, a second circuit board 32 arranged around the 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 magnetic steel 5 and is spaced from each other.

[0033] The driving coil 4 is formed on the second circuit board 32 by additive or etching and is electrically connected to the second circuit board 32. The driving coil 4 includes a plurality of sub-coils 41, each of which includes a plurality of coil layers 411 stacked on top of each other. The circuits of the plurality of coil layers 411 are connected in series to form a terminal 42 electrically connected to the circuits 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 magnetic steel 5 interacts with the driving coil 4 to drive the image sensor module 3 to move along a first direction and a second direction 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 actual application, the image sensor driving device 100 is provided with a lens module above the 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, thereby achieving optical image stabilization.

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

[0035] In this embodiment, the image sensor assembly 3 also includes a welding piece 34. Two adjacent sub-circuit boards 321 form a group of circuit boards. A welding piece 34 is set at one end of two sub-circuit boards 321 in the same group of circuit boards that are close to each other, and both are electrically connected to the welding piece 34 for lead-out.

[0036] Specifically, the multiple coil layers 411 of the sub-coil 41 are connected in series to form multiple terminals 42, and the terminals 42 are all led to the welding sheet 34 through the internal circuits of the multi-layer structure of the sub-coil 41, and are respectively welded to the first circuit board 31. After the circuits of the multiple coil layers 411 are connected in series to form the terminal 42, the lead wires are led into the welding sheet 34 for unified welding, and the contact surface materials are consistent, which effectively reduces the number of welds. It should be noted that each coil layer 411 of each sub-coil 41 can also be set separately.

[0037] In this embodiment, the first circuit board 31 is rectangular, and the sub-circuit boards 321 include four sub-circuit boards 321 respectively located at the four corners of the first circuit board 31; each of the sub-circuit boards 321 includes a first section 3211, a second section 3212 bent and extended from the first section 3211, and a third section 3213 protruding from the connection between the first section 3211 and the second section 3212, the first section 3211 and the second section 3212 are respectively parallel to the two adjacent sides of the first circuit board 31, and the first section 3211 and the second section 3212 are both formed with the sub-coil 41, and the third section 3213 is fixed to the first circuit board 31.

[0038] In this embodiment, the image sensor driving device 100 further includes a conductive member 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 anti-collision block 7 is respectively arranged at one end of the two groups of circuit boards close to each other, and both are fixedly connected to the anti-collision block 7 .

[0040] In this embodiment, the shell 1 includes a bottom cover 12 and an upper cover 11 fixed to the bottom cover 12 and together enclosing the accommodating space, and the through hole 13 is opened in the upper cover 11; the magnetic steel 5 includes a first magnetic steel 51 fixed to the upper cover 11 and a second magnetic steel 52 fixed to the bottom cover 12, and the driving coil 4 is clamped between the first magnetic steel 51 and the second magnetic steel 52, and is spaced apart from the first magnetic steel 51 and the second magnetic steel 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 the utility model fixes the driving coil in the elastic support component by additive or etching, thereby eliminating the need for a separate wire management and placement process, effectively simplifying the assembly process and cost, and saving stacking space along the optical axis direction of the image sensor, which is beneficial to the magnetic circuit design to improve the BL value. Due to the design of fixing the driving coil in the elastic support component by additive or etching, the weight of the driving coil is effectively reduced, and the motion mass is reduced by about 10% compared with the voice coil.

[0042] The above is only an implementation method of the present invention. It should be pointed out that a person skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements are all within the protection scope of the present invention.

Claims

1. An image sensor driving device, the image sensor driving device comprising: A shell having a receiving space and a through hole connecting the receiving space with the outside; An image sensor assembly, the image sensor assembly is received in the receiving space and faces the through hole; An elastic support assembly, the elastic support assembly is fixed to the inner side of the housing and suspends the image sensor assembly in the receiving space; a driving coil, the driving coil being fixed to the image sensor assembly; and A magnetic steel, the magnetic steel is fixed to the housing and is spaced apart from the driving coil; the driving coil interacts with the magnetic steel and drives the elastic support component to move along a direction perpendicular to the optical axis of the image sensor component, so as to drive the image sensor component to move synchronously, characterized in that: The image sensor assembly includes a first circuit board, a second circuit board arranged around the 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; The second circuit board is opposite to the magnetic steel and spaced from each other. 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 of which includes multiple coil layers stacked on each other. The circuits of the multiple coil layers are connected in series to form terminals electrically connected to the circuits of all the coil layers, and the terminals are electrically connected to the second circuit board.

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

3. The image sensor driving device according to claim 1, wherein: The second circuit board includes a plurality of sub-circuit boards that are spaced apart from each other, each of the sub-circuit boards is fixed to and electrically connected to 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, and the sub-circuit boards include four sub-circuit boards respectively located at the four corners of the first circuit board; each sub-circuit board includes a first section, a second section extending from the first section by bending, and a third section formed by protruding from the connection between the first section and the second section, the first section and the second section are respectively parallel to two adjacent sides of the first circuit board, and the sub-coil is formed in both the first section and the second section, and the third section is fixed to the first circuit board.

5. The image sensor driving device according to claim 4, characterized in that: The image sensor assembly also includes a welding piece. Two adjacent sub-circuit boards form a group of circuit boards. A welding piece is set at one end of two sub-circuit boards in the same group of circuit boards that are close to each other, and both are electrically connected to the welding piece for lead wiring.

6. The image sensor driving device according to claim 5, characterized in that: The image sensor driving device further comprises two anti-collision blocks arranged opposite to each other. One anti-collision block is respectively arranged at one end of the two groups of circuit boards close to each other, and both are fixedly connected to the anti-collision block.

7. The image sensor driving device according to claim 1, wherein: The image sensor driving device further includes a conductive member, 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.

8. The image sensor driving device according to claim 6, wherein: The shell includes a bottom cover and an upper cover fixed to the bottom cover and together forming the accommodating space, and the through hole is opened in the upper cover; the magnetic steel includes a first magnetic steel fixed to the upper cover and a second magnetic steel fixed to the bottom cover, and the driving coil is clamped between the first magnetic steel and the second magnetic steel, and is spaced apart from the first magnetic steel and the second magnetic steel; the image sensor driving device also includes an elastic member, which is fixed to the bottom cover, and the anti-collision block is fixedly connected to the upper cover.

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