Optical anti-shake motor device and camera module

Abstract

The present invention relates to the field of camera technology, and in particular to an optical image stabilization motor device and a camera module. The optical image stabilization motor device includes an image sensor unit, a lens carrier and at least two bow drive groups, the lens carrier is used to carry an optical lens, and the bow drive group is used to drive the image sensor unit to move in a direction perpendicular to the optical axis of the optical lens; the bow drive group is arranged on one side of the image sensor unit, the bow drive group includes a shape memory alloy wire and a pair of bow drive units, the bow drive unit includes a bow plate and a metal plate, the bow plate is connected to the metal plate, and the metal plate is fixed on the lens carrier; the shape memory alloy wire is arranged between a pair of bow plates on one side, and the shape memory alloy wire is energized and contracted to drive the bow plate to contact the image sensor unit and push the image sensor unit to move. The present application moves the image sensor unit to correct the jitter by the bow drive group, effectively solving the problem of image optical image stabilization of the terminal device.

Description

Technical Field

[0001] The present invention relates to the field of camera technology, and in particular to an optical image stabilization motor device and a camera module. Background Art

[0002] With the rapid development of multimedia technology, digital cameras, video cameras, tablet computers and mobile phones with cameras are becoming more and more popular among consumers. In digital cameras, video cameras, mobile phone cameras and other photographic devices, the lens module is an indispensable component. The camera module usually includes a lens barrel, a lens holder, a lens and an image sensor. The lens is accommodated in the lens barrel, the image sensor is arranged in the lens holder, and the motor drives the image sensor to move for anti-shake.

[0003] Image sensors usually come with FPC (Flexible Printed Circuit) circuit boards with high rigidity. Traditional electromagnetic VCM motors have limited thrust and are difficult to push image sensors. Summary of the invention

[0004] The purpose of the present invention is to provide an optical image stabilization motor device and a camera module to solve the problem of optical image stabilization of terminal equipment.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An optical image stabilization motor device comprises an image sensor unit, a lens carrier and at least one set of arcuate drive groups, wherein the lens carrier is used to carry an optical lens, and the arcuate drive group is used to drive the image sensor unit to move in a direction perpendicular to the optical axis of the optical lens;

[0007] The arcuate driving group is arranged at one side of the image sensor unit, the arcuate driving group comprises a shape memory alloy wire and a pair of arcuate driving units, the arcuate driving unit comprises an arcuate plate and a metal plate, the arcuate plate is connected to the metal plate, the metal plate is fixed on the lens carrier, and the shape memory alloy wire is arranged between the pair of the arcuate plates;

[0008] The shape memory alloy wire contracts when energized to drive the free end of the arch plate to contact the image sensor unit and push the image sensor unit to move.

[0009] Preferably, the arched plate is provided with a protrusion, and a plurality of friction plates are provided on the image sensor unit, and the friction plates are used to contact the protrusion.

[0010] Preferably, it further comprises a suspension spring, wherein the suspension spring comprises an active area and a peripheral area, and the peripheral area is arranged outside the active area;

[0011] The image sensor unit is arranged on the active area, and the peripheral area is fixed on the lens carrier.

[0012] Preferably, it further comprises a bottom plate, and the suspension spring is arranged on the bottom plate.

[0013] Preferably, a plurality of sliding bearings are arranged between the base plate and the suspension spring.

[0014] Preferably, the suspension spring comprises a metal layer, a first insulating layer, a circuit layer and a second insulating layer stacked in sequence from bottom to top, and the circuit layer is electrically connected to the image sensor unit.

[0015] Preferably, the movable area includes a spring wire and a movable plate;

[0016] The image sensor unit comprises a connecting plate and an outer ring plate, wherein a step is formed between the outer ring plate and the connecting plate;

[0017] The connecting plate is attached to the movable plate, and a gap is left between the outer ring plate and the spring wire.

[0018] Preferably, one arcuate driving group is disposed around each of the four sides of the image sensor unit.

[0019] A camera module comprises an optical lens and the optical image stabilization motor device, wherein a first through hole is provided on the lens carrier, and the optical lens is clamped in the first through hole.

[0020] Preferably, it further comprises an outer cover, wherein the outer cover has a second through hole, the outer cover covers the lens carrier, and the optical lens is arranged in the second through hole.

[0021] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0022] The thrust formed by the shape memory alloy wire is usually 5 to 20 times that of the traditional electromagnetic VCM motor, which can meet the thrust requirements. There is a gap between the bow drive unit and the image sensor unit in the initial state. The shape memory alloy wire on the bow drive group contracts when energized, pulling the bow plate to deform, and the bow plate contacts the image sensor unit, thereby pushing the image sensor unit to move. The drive device of the present application moves the image sensor unit through the bow drive group to correct the jitter, so that the terminal device presents a clear image, effectively solving the problem of optical image stabilization of the terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic diagram of the structure of an optical image stabilization motor device provided by an embodiment of the present invention;

[0025] Figure 2 An exploded schematic diagram of a camera module structure provided by an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the camera module structure provided by an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of an arcuate drive group and an image sensor unit provided by an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of a suspension spring structure provided in an embodiment of the present invention.

[0029] Illustration: image sensor unit 1, suspension spring 2, bow drive unit 3, lens carrier 4, optical lens 5, base plate 6, outer cover 7, shape memory alloy wire 8;

[0030] Friction plate 11, connecting plate 12, outer ring plate 13, spring wire 21, movable plate 22;

[0031] Metal plate 31 , arched plate 32 , and protrusion 321 . DETAILED DESCRIPTION

[0032] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it is to be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally disposed component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally disposed component.

[0034] In addition, terms such as "long", "short", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific direction or operate with a specific direction structure, and should not be understood as a limitation of the present invention.

[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] Embodiment 1

[0037] See also Figures 1 to 5 An optical image stabilization motor device includes an image sensor unit 1, a lens carrier 4 and at least one bow-shaped drive group. The lens carrier 4 is used to carry an optical lens 5. The bow-shaped drive group is used to drive the image sensor unit 1 to move in a horizontal plane, and the horizontal plane is perpendicular to the direction of the optical axis of the optical lens 5.

[0038] The arch drive group is arranged on one side of the image sensor unit 1, and the arch drive group includes a shape memory alloy wire 8 and a pair of arch drive units 3. Specifically, the arch drive unit 3 includes an arch plate 32 and a metal plate 31. The arch plate 32 is connected to the metal plate 31, and the metal plate 31 is fixed on the lens carrier 4. One end of the metal plate 31 is fixed on the lens carrier 4, and the arch plate 32 is connected to the other end of the metal plate 31. The metal plate 33 is deformable, which is equivalent to a flexible hinge.

[0039] A shape memory alloy wire 8 is disposed between a pair of arch plates 32 on one side. The shape memory alloy wire 8 contracts when energized to drive the free ends of the two arch plates 32 to contact the image sensor unit 1 . The shape memory alloy wire 8 further contracts to push the image sensor unit 1 to move.

[0040] Optionally, the motor device includes two arcuate drive groups, which respectively drive the image sensor unit 1 to move in a first direction and a second direction in a horizontal plane.

[0041] When the terminal device is actually used, for example, if the terminal device shakes, the terminal device operates the optical image stabilization motor device according to the preset algorithm to determine the moving direction and displacement. There is a gap between the bow drive unit 3 and the image sensor unit 1 in the initial state. The shape memory alloy wire 8 on the bow drive group is energized and contracted, pulling the bow plate 32 to deform, and the bow plate 32 contacts the image sensor unit 1, thereby pushing the image sensor unit 1 to move. By moving the image sensor unit 1 to correct the shake, the terminal device can present a clear image.

[0042] In an optional embodiment, the arch plate 32 is provided with a protrusion 321, and the image sensor unit 1 is provided with a plurality of friction plates 11 corresponding to the protrusion 321, and the friction plates 11 are used to contact the protrusion 321. The friction plates 11 are attached to the image sensor unit 1, which can play the role of wear resistance and friction reduction.

[0043] Furthermore, the motor device comprises a suspension spring 2 , the suspension spring 2 comprises an active region and a peripheral region, the peripheral region surrounds the active region. The image sensor unit 1 is arranged on the active region, and the peripheral region is fixed on the lens carrier 4 .

[0044] Further, the motor device comprises a bottom plate 6, and the suspension spring 2 is arranged on the bottom plate 6. In actual use, when the stiffness of the suspension spring 2 is not enough to fully support the components including the image sensor unit 1 and above, the motor device as a whole will sink.

[0045] In an optional embodiment, a plurality of sliding bearings are provided between the bottom plate 6 and the suspension spring 2. The sliding bearings are used to assist the suspension spring 2 in playing a certain supporting role on the one hand, and on the other hand, when the active area of ​​the suspension spring 2 moves with the image sensor unit 1, the sliding bearings can ensure that the suspension spring 2 can move more conveniently relative to the bottom plate 6. Optionally, the sliding bearings can be fixed on the bottom plate 6 or on the suspension spring 2.

[0046] In an optional embodiment, the suspension spring 2 includes a metal layer, a first insulating layer, a circuit layer and a second insulating layer stacked in sequence from bottom to top, and the circuit layer is electrically connected to the image sensor unit 1. The metal layer plays a role in supporting the image sensor unit 1 and the above components.

[0047] In an optional embodiment, the active area of ​​the suspension spring 2 includes a spring wire 21 and an active plate 22, and the active plate 22 is connected to the peripheral area through the spring wire 21. The image sensor unit 1 includes a connecting plate 12 and an outer ring plate 13, and the outer ring plate 13 is arranged around the connecting plate 12. A step is formed between the outer ring plate 13 and the connecting plate 12. The connecting plate 12 is attached to the active plate 22, and a gap is left between the outer ring plate 13 and the spring wire 21.

[0048] There is friction when the outer ring plate 13 contacts the spring wire 21. In this embodiment, a gap is avoided between the outer ring plate 13 and the spring wire 21, and the outer ring plate 13 and the spring wire 21 do not contact each other, which is more conducive to the connection plate 12 driving the movable plate 22 to move.

[0049] In this embodiment, an arcuate driving group is disposed around each of the four sides of the image sensor unit 1. One of the arcuate driving groups in the first direction drives the image sensor unit 1 to move to the left, and the other arcuate driving group drives the image sensor unit 1 to move to the right. The two arcuate driving groups in the second direction drive the image sensor unit 1 to move forward or backward.

[0050] Embodiment 2

[0051] See also Figure 3 A camera module includes an optical lens 5 and the optical image stabilization motor device described in the first embodiment. A first through hole is opened on the lens carrier 4, and the optical lens 5 is clamped in the first through hole.

[0052] Furthermore, the camera module also includes an outer cover 7, the outer cover 7 has a second through hole, the outer cover 7 covers the lens carrier 4, and the optical lens 5 is arranged in the second through hole.

[0053] The camera module of the present application moves the image sensor unit through a bow-shaped drive group to correct the jitter, so that the terminal device presents a clear image, effectively solving the problem of optical image stabilization of the terminal device.

[0054] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical image stabilization motor device, characterized in that: It comprises an image sensor unit (1), a lens carrier (4) and an arcuate drive group, wherein the lens carrier (4) is used to carry an optical lens (5), and the arcuate drive group is used to drive the image sensor unit (1) to move in a direction perpendicular to the optical axis of the optical lens (5); The image sensor unit (1) is provided with an arcuate driving group on each side thereof, and the arcuate driving groups on each side thereof respectively drive the image sensor unit (1) to move in a first direction and a second direction on a horizontal plane; the two arcuate driving groups in the first direction drive the image sensor unit (1) to move leftward or rightward; and the two arcuate driving groups in the second direction drive the image sensor unit (1) to move forward or backward; the arcuate driving group comprises a shape memory alloy wire (8) and a pair of arcuate driving units (3); the arcuate driving unit (3) comprises a metal plate (31) and an arcuate plate (32); the arcuate plate (32) is connected to the metal plate (31); the metal plate (31) is fixed on the lens carrier (4); and the shape memory alloy wire (8) is arranged between the pair of arcuate plates (32); The shape memory alloy wire (8) contracts when energized to drive the free end of the arch plate (32) to contact the image sensor unit (1) and push the image sensor unit (1) to move; It also includes a suspension spring (2), the suspension spring (2) including an active area and a peripheral area, the peripheral area being arranged outside the active area; The image sensor unit (1) is arranged on the active area, and the peripheral area is fixed on the lens carrier (4); The movable area includes a spring wire (21) and a movable plate (22); The image sensor unit (1) comprises a connecting plate (12) and an outer ring plate (13), wherein a step is formed between the outer ring plate (13) and the connecting plate (12); The connecting plate (12) is attached to the movable plate (22), and a gap is left between the outer ring plate (13) and the spring wire (21); A base plate (6), the suspension spring (2) is arranged on the base plate (6), and a plurality of sliding bearings are arranged between the base plate (6) and the suspension spring (2).

2. The optical image stabilization motor device according to claim 1, wherein: The arched plate (32) is provided with a protrusion (321), and the image sensor unit (1) is provided with a plurality of friction plates (11), and the friction plates (11) are used to contact the protrusion (321).

3. The optical image stabilization motor device according to claim 1, wherein: The suspension spring (2) comprises a metal layer, a first insulating layer, a circuit layer and a second insulating layer which are stacked in sequence from bottom to top, and the circuit layer is electrically connected to the image sensor unit (1).

4. A camera module, characterized in that: It comprises an optical lens (5) and an optical image stabilization motor device as claimed in any one of claims 1 to 3, wherein a first through hole is provided on the lens carrier (4), and the optical lens (5) is clamped in the first through hole.

5. The camera module according to claim 4, characterized in that: It also comprises an outer cover (7), the outer cover (7) has a second through hole, the outer cover (7) covers the lens carrier (4), and the optical lens (5) is arranged in the second through hole.

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