Sensor driver

Abstract

The utility model provides a sensor driving device, which includes a shell, the shell includes 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 connecting the receiving space with the outside; an image sensor module is received in the receiving space; an elastic support component is fixed to the inner side of the shell and suspends the image sensor module in the receiving space; a driving coil is fixed to the elastic support component; a magnetic steel is fixed to the shell and spaced opposite to the driving coil; the driving coil interacts with the magnetic steel and drives the elastic support component to move, so as to drive the image sensor module to move synchronously; the magnetic steel is a six-level magnetic pole structure, and includes a plurality of sub-magnets arranged at intervals. Compared with the related art, the sensor driving device of the utility model has a better BL value and better performance.

Description

[Technical field]

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

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

[0003] The driving mechanism of the sensor driving device of the related technology is usually composed of a coil and a magnet to form a driving structure. The support frame is supported on the base, the sensor is set at the center of the base, and the driving coil and the driving magnet are fixed on the sensor bracket and the support frame respectively; the OIS coil (anti-shake coil) is fixed to the shell and located above the support frame, and the anti-shake magnet is fixed to the side of the support frame away from the base. When the anti-shake coil is applied with current, the anti-shake coil and the anti-shake magnet generate an electromagnetic field. The anti-shake coil is affected by the Lorentz force of the electromagnetic field, driving the anti-shake magnet to move in a direction parallel to the sensor imaging plane, thereby driving the sensor to move and realizing the OIS anti-shake capability.

[0004] However, in the sensor driving device of the related technology, a group of magnets corresponding to the coil are designed. This group of magnets is arranged around the sensor. When the coil drives the magnet to move, the force that drives the sensor is limited due to the insufficient BL (magnetic force) of the magnet itself, so that the anti-shake performance is limited. Directly increasing the magnetization amount of the magnet will also affect the imaging quality of the optical image sensor module due to leakage magnetism.

[0005] Therefore, it is necessary to provide a new sensor driving device to solve the above problems. [Contents of the utility model]

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

[0007] In order to solve the above technical problems, the utility model provides a sensor driving device, which includes:

[0008] A shell, the shell comprising a bottom cover and a top cover fixed to the bottom cover and together forming a receiving space, the top cover being provided with a through hole connecting the receiving space with the outside;

[0009] An image sensor module, the image sensor module is accommodated in the accommodation space and directly faces the through hole;

[0010] An elastic support component, the elastic support component is fixed to the inner side of the housing and suspends the image sensor module in the receiving space;

[0011] A driving coil, wherein the driving coil is fixed to the image sensor module;

[0012] 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 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;

[0013] The magnetic steel is fixed to the shell and has a six-pole magnetic structure. The magnetic steel includes a plurality of sub-magnetic steels arranged at intervals. Each of the sub-magnetic steels includes a first magnetic direction magnetic steel, a second magnetic direction magnetic steel and a third magnetic direction magnetic steel which are sequentially distributed along a direction perpendicular to an optical axis of the image sensor module and fixedly connected to each other. The first magnetic direction magnetic steel and the third magnetic direction magnetic steel are magnetized along the optical axis direction and in opposite directions. 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 magnet interacts with the drive coil to drive the image sensor module to move along a first direction and a second direction perpendicular to each other, the first direction and the second direction are both perpendicular to the optical axis direction, the sub-magnet is L-shaped, and two sides of the sub-magnet L-shaped structure are parallel to the first direction and the second direction respectively.

[0015] Preferably, the shell is rectangular, the magnetic steel includes four sub-magnetic steels, the four sub-magnetic steels are all L-shaped, and the corner position of each L-shaped structure of the sub-magnetic steel corresponds to the rectangular top corner position of the shell.

[0016] Preferably, the magnetic steel includes 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 includes four sub-magnets, 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 along the optical axis direction.

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

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

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

[0020] Preferably, the sensor driving device further comprises a conductive member, one end of the conductive member is electrically connected to the image sensor module, and the other end of the conductive member is used to connect to an external device.

[0021] Compared with the related art, the sensor driving device of the utility model 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 connecting the receiving space with the outside; an image sensor module, the image sensor module is received in the receiving space and directly faces the through hole; an elastic support component, the elastic support component is fixed to the inner side of the shell and suspends the image sensor module in the receiving space; a driving coil, the driving coil is fixed to the image sensor module; a magnetic steel, the magnetic steel is fixed to the shell and is spaced opposite to the driving coil; the driving The coil interacts with the magnetic steel 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 is a six-pole magnetic pole structure, the magnetic steel includes a plurality of sub-magnetic steels arranged at intervals, each of the sub-magnetic steels includes a first magnetic direction magnetic steel, a second magnetic direction magnetic steel and a third magnetic direction magnetic steel which are sequentially distributed along the direction perpendicular to the optical axis of the image sensor module and fixedly connected to each other, the first magnetic direction magnetic steel and the third magnetic direction magnetic steel are magnetized along the optical axis direction and in opposite 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 design of the six-pole magnetic pole magnetic steel effectively improves the BL performance of the sensor driving device and improves the performance of the sensor driving device.

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 It is a three-dimensional structural schematic diagram of the sensor driving device of the utility model;

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

[0025] Figure 3 A schematic diagram of a three-dimensional structure decomposition of a sensor driving device provided in an embodiment of the utility model;

[0026] Figure 4 A schematic diagram of the three-dimensional structure of a sub-magnetic steel provided in an embodiment of the utility model;

[0027] Figure 5 For along Figure 4 The cross section of the BB line and the schematic diagram of the magnetization direction of the sub-magnetic steel. [Specific implementation method]

[0028] 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.

[0029] See also Figure 1-5 As shown, the utility model provides a sensor driving device 100, which includes:

[0030] A housing 1, the housing 1 comprising a bottom cover 12 and a top cover 11 fixed to the bottom cover 12 and together forming a receiving space, the top cover 11 being provided with a through hole 111 for connecting the receiving space with the outside;

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

[0032] An elastic support component 3, wherein the elastic support component 3 is fixed to the inner side of the housing 1 and suspends the image sensor module 2 in the receiving space; the elastic support component 3 is an FPC (flexible printed circuit);

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

[0034] The magnetic steel 5 is fixed to the housing 1 and is spaced apart from the driving coil 4; the driving coil 4 interacts with the magnetic steel 5, so that the elastic support component 3 drives the image sensor module 2 to move in a plane perpendicular to the optical axis direction of the image sensor module 2. Through such a design, the image sensor module 2 achieves optical image stabilization; 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 applications, the sensor driving device 100 is provided with a lens module above its optical axis direction. When the image sensor module 2 moves in a plane perpendicular to the optical axis direction, that is, moves relative to the lens module, optical image stabilization is achieved.

[0035] The magnetic steel 5 is fixed to the housing 1 and has a six-pole magnetic structure. The magnetic steel 5 includes a plurality of sub-magnetic steels arranged at intervals.

[0036] Specifically, the magnetic steel 5 includes 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 have the same structure and each includes four sub-magnetic steels. The driving coil 4 is sandwiched 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. It can be understood that, corresponding to the design that there are four sub-magnetic steels in each of the first magnetic steel 51 and the second magnetic steel 52, the driving coil 4 is also composed of four groups of coils. The six-pole magnetic steel and the double-sided magnetic steel design of the driving coil can effectively improve BL.

[0037] Specifically, the shell 1 is rectangular, the first magnetic steel 51 and the second magnetic steel 52 each include four sub-magnets, and the sub-magnets are all L-shaped structures. The two sides of the L-shaped structure of the sub-magnets are parallel to the first direction and the second direction respectively. The first direction and the second direction are specifically determined by the direction of the interaction force between the two sides of the sub-magnets and the driving coil 4. It can be understood that when the sub-magnets are set to be L-shaped, the driving coil 4 should also be L-shaped. When the two drive each other to drive the image sensor module 2 to move to achieve optical image stabilization, the image stabilization direction is perpendicular to the two sides of the L-shaped structure. The optical axis direction of the image sensor module 2 is the z-axis direction of the spatial coordinate system. 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 top corner position of the housing 1.

[0039] Specifically, in the embodiment of the present invention, the first magnetic steel 51 includes 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 includes 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 invention, the first sub-magnetic steel 511 is taken as an example for explanation. The first sub-magnetic steel 511 includes 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 along the optical axis direction perpendicular to the image sensor module 2 and fixedly connected to each other. The first magnetic direction magnetic steel 5111 and the third magnetic direction magnetic steel 5113 are magnetized along the optical axis direction parallel to the image sensor module 2 and in opposite magnetization directions. The second magnetic direction magnetic steel 5112 is magnetized along the optical axis direction perpendicular to 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, the side of the first magnetic orientation magnet 5111 close to the top cover 11 is the S pole, and the side of the first magnetic orientation magnet 5111 away from the top cover 11 is the N pole; the side of the second magnetic orientation magnet 5112 close to the image sensor module 2 is the S pole, and the side of the second magnetic orientation magnet 5112 away from the image sensor module 2 is the N pole; the side of the third magnetic orientation magnet 5113 close to the top cover 11 is the N pole, and the side of the third magnetic orientation magnet 5113 away from the top cover 11 is the S pole.

[0042] The magnetic steel 5 also includes a magnetic conductive sheet 53 sandwiched between the magnetic steel 5 and the housing 1. Corresponding to the design that the first magnetic steel 51 includes four L-shaped sub-magnets, the magnetic conductive sheets 53 are also arranged in groups of four, and the magnetic conductive sheets 53 can prevent the magnetic leakage of the magnetic steel from affecting the image sensor module 2.

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

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

[0045] The sensor driving device 100 further includes a conductive member 6 , one end of which is electrically connected to the image sensor module 2 , and the other end of which is used to connect to an external device.

[0046] In actual setting, the image sensor module 2 can be specifically divided into a support sheet 23 fixedly connected to the elastic support component 3, an image sensor 22 fixed to the support sheet 23, a base plate 24 arranged around the outside of the image sensor 22, and a light-transmitting sheet 21 arranged at intervals along the optical axis direction on the image sensor 22 and exposed on one side of the through hole 111, wherein the base plate 24 is a PCB printed circuit board. Based on such a structure, the driving coil 4 is fixedly arranged on the base plate 24 and electrically connected thereto, and is arranged at corresponding intervals with the first magnetic steel 51 and the second magnetic steel 52 along the optical axis direction.

[0047] Compared with the related art, the present invention 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 connecting the receiving space with the outside; an image sensor module, the image sensor module is received in the receiving space and directly faces the through hole; an elastic support component, the elastic support component 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 magnetic steel, the magnetic steel is fixed to the shell and is spaced opposite to the drive coil; the drive coil and the magnetic steel The elastic support assembly drives the image sensor module to move in a plane perpendicular to the optical axis of the image sensor module through interaction; the magnetic steel is fixed to the housing and is a six-pole magnetic structure, the magnetic steel includes a plurality of spaced-apart sub-magnets, each of which includes 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 to each other along a direction perpendicular to the optical axis of the image sensor module, the first magnetic direction magnetic steel and the third magnetic direction magnetic steel are magnetized along the optical axis and in opposite 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 design of the six-pole magnetic steel effectively improves the BL performance of the sensor driving device and improves the performance of the sensor driving device.

[0048] 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. A sensor driving device, comprising: A shell, the shell comprising a bottom cover and a top cover fixed to the bottom cover and together forming a receiving space, the top cover being provided with a through hole connecting the receiving space with the outside; An image sensor module, the image sensor module is accommodated in the accommodation space and directly faces the through hole; An elastic support component, the elastic support component is fixed to the inner side of the housing and suspends the image sensor module in the receiving space; A driving coil, wherein the driving coil is fixed to the image sensor module; 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 so that the elastic support component drives the image sensor module to move in a plane perpendicular to the optical axis direction of the image sensor module; characterized in that, The magnetic steel is fixed to the shell and has a six-pole magnetic structure. The magnetic steel includes a plurality of sub-magnetic steels arranged at intervals. Each of the sub-magnetic steels includes a first magnetic direction magnetic steel, a second magnetic direction magnetic steel and a third magnetic direction magnetic steel which are sequentially distributed along a direction perpendicular to an optical axis of the image sensor module and fixedly connected to each other. The first magnetic direction magnetic steel and the third magnetic direction magnetic steel are magnetized along the optical axis direction and in opposite directions. The magnetization direction of the second magnetic direction magnetic steel is perpendicular to the magnetization direction of the first magnetic direction magnetic steel.

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

3. The sensor driving device according to claim 2, characterized in that: The shell is rectangular, the magnetic steel includes four sub-magnetic steels, and the four sub-magnetic steels are all L-shaped. The corner position of each L-shaped structure of the sub-magnetic steel corresponds to the rectangular top corner position of the shell.

4. The sensor driving device according to claim 3, characterized in that: The magnetic steel includes 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 includes four sub-magnets. 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 along the optical axis direction.

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

6. The sensor driving device according to claim 1, characterized in that: Each of the sub-magnetic steels is bonded and fixed, or integrally formed, by the first magnetic direction magnetic steel, the second magnetic direction magnetic steel and the third magnetic direction magnetic steel.

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

8. The sensor driving device according to claim 1, characterized in that: The sensor driving device further includes a conductive member, 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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