Sensor driving device

Abstract

Provided in the present utility model is a sensor driving device. The sensor driving device comprises: a housing, which comprises a bottom cover, and a top cover fixed to the bottom cover and enclosing an accommodating space together with the bottom cover, wherein the top cover is provided with a through hole that communicates the accommodating space with the outside; an image sensor module, which is accommodated in the accommodating space; an elastic support assembly, which is fixed to the inner side of the housing and suspends the image sensor module in the accommodating space; a driving coil, which is fixed to the elastic support assembly; and magnetic steel, which is fixed to the housing and arranged opposite the driving coil at an interval, wherein the driving coil interacts with the magnetic steel and drives the elastic support assembly to move, thereby driving the image sensor module to move synchronously; and the magnetic steel is of a six-pole magnetic structure and comprises a plurality of sub-magnetic steel pieces arranged at intervals. Compared with the related art, the sensor driving device of the present utility model has a better BL value and better performance.

Description

Sensor driving device TECHNICAL FIELD

[0001] The utility model relates to a driving device especially relates to a sensor driving device. BACKGROUND

[0002] With the development of camera technology, sensor driving devices are widely used in various camera devices. The combination of sensor driving devices with various portable electronic devices such as mobile phones, cameras, computers, etc. is also favored by consumers.

[0003] The driving mechanism of the sensor driving device of the related technology is usually formed by a coil and a magnetic steel combination to form a driving structure, a support frame is supported on the seat bottom, a sensor is arranged at the center of the base, a drive coil and a drive magnetic steel are fixed on the sensor support and the support frame respectively; an OIS coil (anti-shake coil) is fixed on the shell and located above the support frame, an anti-shake magnetic steel is fixed on the side of the support frame away from the base. When the anti-shake coil applies current, the anti-shake coil and the anti-shake magnetic steel generate an electromagnetic field, the anti-shake coil is affected by the Lorentz force of the electromagnetic field, and the anti-shake magnetic steel is driven to move in the direction parallel to the imaging plane of the sensor, thereby driving the sensor to move and realizing the OIS anti-shake capability. TECHNICAL PROBLEM

[0004] However, in the sensor driving device of the related technology, a group of magnetic steels corresponding to the coil is designed, and the group of magnetic steels is arranged around the sensor. When the coil drives the magnetic steel to move, the driving force of the sensor is limited due to the insufficient BL (magnetic force) of the magnetic steel itself, and directly increasing the magnetization of the magnetic steel will also affect the imaging quality of the optical image sensor module due to magnetic leakage.

[0005] Therefore, it is necessary to provide a new sensor driving device to solve the above problems. TECHNICAL SOLUTION

[0006] The technical problem to be solved by the utility model is to provide a sensor driving device with better BL.

[0007] To solve the above technical problems, the utility model provides a sensor driving device, which comprises:

[0008] A shell, the shell comprises a bottom cover and a top cover fixed to the bottom cover and together enclosing a receiving space, the top cover is provided with a through hole communicating the receiving space with the outside;

[0009] An image sensor module, the image sensor module is received in the receiving space and opposite to the through hole;

[0010] a resilient supporting assembly fixed to the inner side of the shell and suspending the image sensor module in the receiving space;

[0011] a driving coil fixed to the image sensor module;

[0012] a magnetic steel fixed to the shell and spaced opposite to the driving coil; the driving coil and the magnetic steel interact with each other to drive the resilient supporting assembly to move the image sensor module in a plane perpendicular to the optical axis direction of the image sensor module;

[0013] the magnetic steel is fixed to the shell and has a six-pole magnetic pole structure, and comprises a plurality of spaced sub-magnetic steels; each of the sub-magnetic steels comprises a first magnetic direction magnetic steel, a second magnetic direction magnetic steel and a third magnetic direction magnetic steel which are sequentially distributed and fixedly connected in a direction perpendicular to the optical axis direction of the image sensor module; the first magnetic direction magnetic steel and the third magnetic direction magnetic steel are magnetized in the optical axis direction and have opposite magnetization directions; and the magnetization direction of the second magnetic direction magnetic steel is perpendicular to the magnetization direction of the first magnetic direction magnetic steel.

[0014] Preferably, the magnetic steel and the driving coil interact to drive the image sensor module to move in first and second directions perpendicular to each other; the first and second directions are both perpendicular to the optical axis direction; and the sub-magnetic steel has an L shape, and two sides of the L shape of the sub-magnetic steel are parallel to the first and second directions, respectively.

[0015] Preferably, the shell has a rectangular shape; the magnetic steel comprises four sub-magnetic steels; and each of the four sub-magnetic steels has an L shape, and a corner of the L shape of each of the sub-magnetic steels corresponds to a top corner of the rectangular shell.

[0016] Preferably, the magnetic steel comprises a first magnetic steel fixed to the top cover and a second magnetic steel fixed to the bottom cover; the first magnetic steel and the second magnetic steel have the same structure and each comprise four sub-magnetic steels; 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 in the optical axis direction.

[0017] Preferably, the magnetic steel further comprises a magnetic conductive sheet clamped between the magnetic steel and the shell.

[0018] Preferably, each of the sub-magnetic steels is fixed by adhesion of the first magnetic direction magnetic steel, the second magnetic direction magnetic steel and the third magnetic direction magnetic steel, or is integrally formed.

[0019] Preferably, the first magnetic direction magnet along the height parallel to the optical axis direction of the image sensor module is the same as the third magnetic direction magnet along the height parallel to the optical axis direction of the image sensor module, and the second magnetic direction magnet along the height parallel to the optical axis direction of the image sensor module is smaller than the first magnetic direction magnet along the height parallel to the optical axis direction of the image sensor module.

[0020] Preferably, the sensor driving device further comprises a conductive piece, one end of the conductive piece is electrically connected with the image sensor module, and the other end of the conductive piece is used for connecting an external device. Advantages

[0021] Compared with the related art, the sensor driving device comprises a shell, the shell comprises a bottom cover and a top cover fixed to the bottom cover and together enclosing a receiving space, the top cover is provided with a through hole for connecting the receiving space with the outside; an image sensor module, the image sensor module 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 shell and suspends the image sensor module in the receiving space; a drive coil, the drive coil is fixed to the image sensor module; a magnet, the magnet is fixed to the shell and is spaced apart from the drive coil; the drive coil and the magnet interact with each other, so that the elastic support assembly drives the image sensor module to move in a plane perpendicular to the optical axis direction of the image sensor module; the magnet is fixed to the shell and has a six-pole magnetic pole structure, the magnet comprises a plurality of spaced-apart sub-magnets, each sub-magnet comprises a first magnetic direction magnet, a second magnetic direction magnet and a third magnetic direction magnet which are sequentially distributed and fixedly connected in a direction perpendicular to the optical axis direction of the image sensor module, the first magnetic direction magnet and the third magnetic direction magnet are magnetized along the optical axis direction and have opposite magnetization directions, and the magnetization direction of the second magnetic direction magnet is perpendicular to the magnetization direction of the first magnetic direction magnet. In the above structure, the six-pole magnet is designed, which effectively improves the BL performance of the sensor driving device and improves the performance of the sensor driving device. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced below, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor, wherein:

[0023] Fig. 1 is a three-dimensional structure schematic diagram of the sensor driving device of the utility model;

[0024] Fig. 2 is a sectional view along line A-A in Fig. 1;

[0025] Fig. 3 is a perspective structural exploded schematic view of the sensor driving device provided by the embodiment of the present application;

[0026] Fig. 4 is a perspective structural schematic view of the sub-magnetic steel provided by the embodiment of the present application;

[0027] Fig. 5 is a sectional view along line B-B in Fig. 4 and a schematic view of the magnetizing direction of the sub-magnetic steel. Embodiment of the present application

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] Please refer to Figs. 1-5, the present application provides a sensor driving device 100, which comprises:

[0030] A shell 1, which comprises a bottom cover 12 and a top cover 11 fixed to the bottom cover 12 and together enclosing a receiving space, the top cover 11 is provided with a through hole 111 for connecting the receiving space with the outside;

[0031] An image sensor module 2, which is received in the receiving space and opposite to the through hole 111;

[0032] An elastic support assembly 3, which is fixed to the inner side of the shell 1 and suspends the image sensor module 2 in the receiving space; the elastic support assembly 3 is a FPC (flexible circuit board);

[0033] A driving coil 4, which is fixed to the image sensor module 2;

[0034] A magnetic steel 5 is fixed to the shell 1 and spaced opposite to the driving coil 4; the driving coil 4 interacts with the magnetic steel 5, so that the elastic support assembly 3 drives the image sensor module 2 to move in a plane perpendicular to the optical axis direction of the image sensor module 2, so that the image sensor module 2 realizes optical anti-shake through such design. Specifically, the magnetic steel 5 interacts with the driving coil 4 to drive the image sensor module 2 to move in 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 sensor driving device 100 is provided with a lens module above the optical axis direction thereof, and when the image sensor module 2 moves in the plane perpendicular to the optical axis direction, i.e. moves relative to the lens module, optical anti-shake is realized.

[0035] The magnetic steel 5 is fixed to the shell 1 and has a six-pole magnetic pole structure, and the magnetic steel 5 comprises a plurality of spaced sub-magnetic steels.

[0036] Specifically, the magnetic steel 5 comprises a first magnetic steel 51 fixed to the top cover 11 and a second magnetic steel 52 fixed to the bottom cover 12, the first magnetic steel 51 and the second magnetic steel 52 are structurally identical and each comprise four sub-magnetic steels, and the driving coil 4 is arranged between the first magnetic steel 51 and the second magnetic steel 52 and spaced from the first magnetic steel 51 and the second magnetic steel 52. It can be understood that corresponding to the design that each of the first magnetic steel 51 and the second magnetic steel 52 has four sub-magnetic steels, the driving coil 4 is also arranged by four groups of coils. The six-pole magnetic steel and the double-sided magnetic steel design of the driving coil can effectively improve the BL.

[0037] Specifically, the shell 1 is rectangular, the first magnetic steel 51 and the second magnetic steel 52 each comprise four sub-magnetic steels, and each of the sub-magnetic steels has an L-shaped structure, the two sides of the L-shaped structure of the sub-magnetic steel are parallel to the first direction and the second direction, and the first direction and the second direction are determined by the interaction force direction of the two sides of the sub-magnetic steel and the lower part of the driving coil 4. It can be understood that when the sub-magnetic steel is arranged in an L shape, the driving coil 4 should also be in an L shape, and when the image sensor module 2 is driven to move to realize optical anti-shake, the anti-shake direction is perpendicular to the two sides of the L-shaped structure, and the optical axis direction of the image sensor module 2 is the z-axis direction of the spatial coordinate system, and the first direction and the second direction can be the x-axis direction and the y-axis direction respectively.

[0038] The corner position of the L-shaped structure of each sub-magnetic steel corresponds to the rectangular corner position of the shell 1.

[0039] Specifically, in the embodiment of the present application, the first magnetic steel 51 comprises a first sub-magnetic steel 511, a second sub-magnetic steel 512, a third sub-magnetic steel 513 and a fourth sub-magnetic steel 514, and the second magnetic steel 52 comprises a fifth sub-magnetic steel 521, a sixth sub-magnetic steel 522, a seventh sub-magnetic steel 523 and an eighth sub-magnetic steel 524.

[0040] In the embodiment of the present application, the first sub-magnetic steel 511 is taken as an example for description, the first sub-magnetic steel 511 comprises a first magnetic direction magnetic steel 5111, a second magnetic direction magnetic steel 5112 and a third magnetic direction magnetic steel 5113 which are sequentially distributed and fixedly connected along a direction perpendicular to an optical axis of the image sensor module 2, the first magnetic direction magnetic steel 5111 and the third magnetic direction magnetic steel 5113 are magnetized along the direction parallel to the optical axis of the image sensor module 2 and the magnetization directions thereof are opposite, the second magnetic direction magnetic steel 5112 is magnetized along the direction perpendicular to the optical axis of the image sensor module 2, and the magnetization direction of the second magnetic direction magnetic steel 5112 is perpendicular to the magnetization direction of the first magnetic direction magnetic steel 5111. The magnetization directions of the remaining sub-magnetic steels are the same as that of the first sub-magnetic steel 511.

[0041] Specifically, one side of the first magnetic direction magnetic steel 5111 close to the top cover 11 is S pole, and the other side of the first magnetic direction magnetic steel 5111 far from the top cover 11 is N pole; one side of the second magnetic direction magnetic steel 5112 close to the image sensor module 2 is S pole, and the other side of the second magnetic direction magnetic steel 5112 far from the image sensor module 2 is N pole; one side of the third magnetic direction magnetic steel 5113 close to the top cover 11 is N pole, and the other side of the third magnetic direction magnetic steel 5113 far from the top cover 11 is S pole.

[0042] The magnetic steel 5 further comprises a magnetic conductive sheet 53 clamped between the magnetic steel 5 and the shell 1. Corresponding to the design of the first magnetic steel 51 comprising four L-shaped sub-magnetic steels, the magnetic conductive sheet 53 is also provided in groups of four, and the magnetic conductive sheet 53 can avoid the influence of magnetic leakage of the magnetic steel on the image sensor module 2.

[0043] Each of the sub-magnetic steels is fixedly bonded by the first magnetic direction magnetic steel 5111, the second magnetic direction magnetic steel 5112 and the third magnetic direction magnetic steel 5113, or integrally formed.

[0044] The height of the first magnetic direction magnetic steel 5111 along the direction parallel to the optical axis of the image sensor module 2 is the same as the height of the third magnetic direction magnetic steel 5113 along the direction parallel to the optical axis of the image sensor module 2, and the height of the second magnetic direction magnetic steel 5112 along the direction parallel to the optical axis of the image sensor module 2 is smaller than the height of the first magnetic direction magnetic steel 5111 along the direction parallel to the optical axis of the image sensor module 2.

[0045] The sensor driving device 100 further comprises a conductive piece 6, one end of the conductive piece 6 is electrically connected with the image sensor module 2, and the other end of the conductive piece 6 is used for connecting an external device.

[0046] In actual arrangement, the image sensor module 2 can be specifically divided into a support sheet 23 fixedly connected with the elastic support assembly 3, an image sensor 22 fixed to the support sheet 23, a bottom plate 24 annularly arranged outside the image sensor 22, and a light-transmitting sheet 21 arranged along the optical axis direction and spaced apart from the image sensor 22 exposed on one side of the through hole 111, wherein the bottom plate 24 is a PCB (Printed Circuit Board), based on such a structure, the drive coil 4 is fixedly arranged on the bottom plate 24 and electrically connected with the bottom plate 24, and is correspondingly and spacedly arranged along the optical axis direction with the first magnetic steel 51 and the second magnetic steel 52.

[0047] Compared with the related art, the sensor driving device comprises a shell, the shell comprises a bottom cover and a top cover fixed to the bottom cover and together enclosing a receiving space, the top cover is provided with a through hole for connecting the receiving space with the outside; an image sensor module is received in the receiving space and opposite to the through hole; an elastic support assembly is fixed to the inner side of the shell and suspends the image sensor module in the receiving space; a drive coil is fixed to the image sensor module; a magnetic steel is fixed to the shell and spaced opposite to the drive coil; the drive coil and the magnetic steel interact with each other, so that the elastic support assembly drives the image sensor module to move in a plane perpendicular to the optical axis direction of the image sensor module; the magnetic steel is fixed to the shell and has a six-pole magnetic pole structure, the magnetic steel comprises a plurality of spaced sub-magnetic steels, each of the sub-magnetic steels comprises a first magnetic direction magnetic steel, a second magnetic direction magnetic steel and a third magnetic direction magnetic steel which are sequentially distributed and fixedly connected with each other along a direction perpendicular to the optical axis direction of the image sensor module, the first magnetic direction magnetic steel and the third magnetic direction magnetic steel are magnetized along the optical axis direction and have opposite magnetization directions, and the magnetization direction of the second magnetic direction magnetic steel is perpendicular to the magnetization direction of the first magnetic direction magnetic steel. In the above structure, the six-pole magnetic steel is designed, which effectively improves the BL performance of the sensor driving device and improves the performance of the sensor driving device.

[0048] The above only describes the embodiments of the present application, and it should be pointed out that those skilled in the art can make improvements without departing from the inventive concept of the present application, but these improvements are within the protection scope of the present application.

Claims

1. A sensor driving device, comprising: The housing includes a bottom cover and a top cover fixed to the bottom cover and together forming a receiving space, the top cover having a through hole that connects the receiving space to the outside. An image sensor module, wherein the image sensor module is housed within the housing space and is directly opposite the through hole; An elastic support assembly is fixed to the inside of the housing and suspends the image sensor module within the receiving space; A drive coil, the drive coil being fixed to the image sensor module; A magnet is fixed to the housing and spaced apart from the drive coil; the drive coil interacts with the magnet, causing the elastic support assembly to move the image sensor module in a plane perpendicular to the optical axis of the image sensor module; characterized in that... The magnet is fixed to the housing and has a six-pole structure. The magnet includes multiple spaced sub-magnets. Each sub-magnet includes a first magnetic direction magnet, a second magnetic direction magnet, and a third magnetic direction magnet that are sequentially distributed and fixedly connected to each other along a direction perpendicular to the optical axis of the image sensor module. The first magnetic direction magnet and the third magnetic direction magnet are magnetized along the optical axis and in opposite directions. The magnetization direction of the second magnetic direction magnet is perpendicular to the magnetization direction of the first magnetic direction magnet.

2. The sensor driving device according to claim 1, characterized in that, The magnet interacts with the driving coil to drive the image sensor module to move along a first direction and a second direction that are perpendicular to each other. The first direction and the second direction are both perpendicular to the optical axis. The sub-magnet is L-shaped, and the two sides of the L-shaped structure of the sub-magnet are parallel to the first direction and the second direction, respectively.

3. The sensor driving device according to claim 2, characterized in that, The housing is rectangular, and the magnet includes four sub-magnets, all of which are L-shaped. The corner of the L-shaped structure of each sub-magnet corresponds to the top corner of the rectangular housing.

4. The sensor driving device according to claim 3, characterized in that, The magnet includes a first magnet fixed to the top cover and a second magnet fixed to the bottom cover. The first magnet and the second magnet have the same structure and each includes four sub-magnets. The drive coil is sandwiched between the first magnet and the second magnet and is spaced apart from both the first magnet and the second magnet along the optical axis.

5. The sensor driving device according to claim 1, characterized in that, The magnet also includes a magnetic conductive sheet sandwiched between the magnet and the housing.

6. The sensor driving device according to claim 1, characterized in that, Each of the sub-magnets is formed by bonding or integrally molding the first magnetic direction magnet, the second magnetic direction magnet, and the third magnetic direction magnet.

7. The sensor driving device according to claim 1, characterized in that, The height of the first magnetic directional magnet along the optical axis parallel to the image sensor module is the same as the height of the third magnetic directional magnet along the optical axis parallel to the image sensor module, and the height of the second magnetic directional magnet along the optical axis parallel to the image sensor module is less than the height of the first magnetic directional magnet along the optical axis parallel to the image sensor module.

8. The sensor driving device according to claim 1, characterized in that, The sensor driving device also includes a conductive component, one end of which is electrically connected to the image sensor module, and the other end of which is used to connect to an external device.

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