CN216531506U - Optical actuator, camera module and electronic equipment - Google Patents

Abstract

The disclosure relates to an optical actuator, a camera module and an electronic device, wherein the actuator comprises a first base body, a second base body, an SMA component and an elastic structure, the SMA component and the elastic structure are respectively connected between the first base body and the second base body, the SMA component is configured to drive the first base body to move towards a preset direction relative to the second base body after being electrified, the elastic structure is configured to generate an elastic force resisting the movement of the first base body after the SMA component is electrified, and in an initial position, the first base body is arranged to deviate from a position where the first base body and the second base body are aligned relative to the second base body in a direction opposite to the preset direction. In the embodiment of the disclosure, the SMA component is combined with the elastic structure, and by setting a suitable initial position of the first substrate, the movement of the first substrate in the opposite direction is realized, so as to achieve the effect of compensating the shake. Therefore, only one-way motion of the SMA assembly can be controlled, which can simplify the control scheme of the actuator and effectively reduce the control cost and the material cost.

Description

Optical actuator, camera module and electronic equipment

Technical Field

The present disclosure relates to the field of optical technologies, and in particular, to an optical actuator, a camera module, and an electronic device.

Background

In the related art, in order to make the imaging effect of the image pickup apparatus clearer, an actuator is generally provided to drive the movement of the optical device so that the sensor captures a high-quality image. The existing actuator forms include a voice coil form and an SMA form, wherein the principle of SMA driving is that a moving part is pulled to drive an optical device to move after an SMA part is heated, two groups of SMA parts are usually arranged in opposite directions of the moving part, and the moving part is pulled to move back and forth in opposite directions through the two groups of SMA parts respectively. However, with this type of drive, movement of the movable member in opposite directions needs to be achieved by controlling the two sets of SMA members, which results in a rather complicated control process and increases the control and material costs.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to provide an optical actuator, a camera module, and an electronic apparatus to at least partially solve the problems in the related art.

In order to achieve the above object, the present disclosure provides an optical actuator, including a first substrate, a second substrate, an SMA assembly and a resilient structure, the SMA assembly and the resilient structure being respectively connected between the first substrate and the second substrate, the SMA assembly being configured to bring the first substrate to a predetermined direction relative to the second substrate after being powered on, the resilient structure being configured to generate a resilient force resisting the movement of the first substrate after the SMA assembly is powered on, wherein, in an initial position, the first substrate is disposed to be offset from a position where the first substrate is aligned with the second substrate relative to the second substrate in a direction opposite to the predetermined direction.

Optionally, the SMA assembly comprises a first SMA element for driving the first substrate to move in a first direction and a second SMA element for driving the first substrate to move in a second direction, the first direction and the second direction being at an angle to each other.

Optionally, the actuator further comprises a metal plate, the first base being mounted to the metal plate, the first and second SMA pieces being connected between the metal plate and the second base, respectively.

Optionally, the elastic structure includes a spring wire bent from the metal plate, and a tip of the spring wire, which protrudes from the metal plate, is connected to the second base.

Optionally, the second base is provided with a metal support, and the actuator further comprises a support structure disposed in contact between the metal plate and the metal support for supporting the first base for movement.

Optionally, the support structure comprises a ball and/or a sliding shaft.

Optionally, the actuator further comprises a guiding structure located between the first base and the second base for guiding the first base to move towards the preset direction.

Optionally, the SMA assembly is configured to drive the first base to move in a first direction and a second direction at an angle to the first direction, one of the first base and the guide structure is formed with a first runner extending in the first direction, the other is formed with a first projection that is extendable into the first runner and is relatively movable with the first runner in the first direction, one of the second base and the guide structure is formed with a second runner extending in the second direction, and the other is formed with a second projection that is extendable into the second runner and is relatively movable with the second runner in the second direction.

According to a second aspect of the present disclosure, there is also provided a camera module including the optical actuator provided by the present disclosure.

According to a third aspect of the present disclosure, an electronic device is further provided, which includes the camera module provided by the present disclosure

Through the technical scheme, when the shake needs to be compensated in the direction opposite to the preset direction at the initial position, the SMA component can be electrified to drive the first base body to move to the required position between the initial position and the centering position in the preset direction, but it needs to be noted that the initial position is the maximum stroke which can be compensated in the direction opposite to the preset direction, and the elastic structure at the position is in a free state; when the shake does not need to be compensated, the SMA assembly can be electrified, so that the first base body moves to a centering position with the second base body in the preset direction; when the shake needs to be compensated in the preset direction, the SMA assembly may be further energized, for example, the current is increased, so that the first substrate further moves from the centering position to the preset direction; in addition, when the shake needs to be compensated in the direction opposite to the preset direction in the centering position, the current of the SMA component can be reduced or the power of the SMA component can be cut off, and the elastic action of the elastic structure is larger than the pulling force of the SMA component to drive the first base body to move reversely to the required position. In the embodiment of the disclosure, the motion of the first substrate in the opposite direction is realized by the combination of the one-way driving and the elastic structure of the SMA assembly and by setting the appropriate initial position of the first substrate, so as to achieve the effect of compensating for the jitter. Therefore, only one-way motion of the SMA assembly can be controlled, which can simplify the control scheme of the actuator and effectively reduce the control cost and the material cost.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:

FIG. 1 is an exploded schematic view of an optical actuator provided in an exemplary embodiment of the present disclosure;

FIG. 2 is an assembled schematic view of the optical actuator illustrated in FIG. 1 with portions of the structure omitted;

FIG. 3 is a schematic diagram of an exploded view of an optical actuator provided in another exemplary trial version of the present disclosure;

fig. 4 is an assembly view of the optical actuator illustrated in fig. 3 with a portion of the structure omitted.

Description of the reference numerals

10-first base, 20-second base, 21-mounting table, 30-SMA component, 31-first SMA piece, 32-second SMA piece, 33-wire clamp, 40-elastic structure, 41-connecting part, 50-metal plate, 60-supporting structure, 70-guiding structure, 81-first runner, 82-second runner, 91-first boss, 92-second boss, 100-housing.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

Terms such as "first, second, and the like, used in the present disclosure are intended to distinguish one element from another element without order or importance. Further, in the following description, when referring to the figures, the same reference numbers in different figures denote the same or similar elements.

Referring to fig. 1 to 4, the present disclosure provides a camera module and an optical actuator thereof, where the optical actuator may be used for optical anti-shake, the camera module may include an optical element and a photosensitive element, and light guided through the optical element is transmitted to the photosensitive element and then converted into an electrical signal, the actuator includes a first substrate 10, a second substrate 20, an SMA (shape memory alloy) assembly 30, and an elastic structure 40, where the second substrate 20 is fixed and the first substrate 10 is capable of moving, one of the first substrate 10 and the second substrate 20 may be mounted with the optical element, and the other may be mounted with the photosensitive element, and in the present disclosure, the mounting manner is described as an example that the optical element is mounted on the first substrate 10 and the photosensitive element is mounted on the second substrate 20, but the present disclosure is not limited by this mounting manner.

Wherein, the SMA component 30 and the elastic structure 40 are respectively connected between the first substrate 10 and the second substrate 20, the SMA component 30 is configured to drive the first substrate 10 to move in a preset direction relative to the second substrate 20 after being powered on, specifically, the SMA component 30 and the elastic structure 40 are configured to generate an elastic force resisting the movement of the first substrate 10 after the SMA component 30 is powered on, it should be noted here that the movement of the first substrate 10 in two opposite directions is realized by the SMA component 30 and the elastic structure 40, that is, the SMA component 30 in the embodiment of the disclosure does not drive the first substrate 10 to move in two opposite directions in two directions, but drives the first substrate 10 to move in one direction, for example, if the SMA component 30 drives the first substrate 10 to move to the left, the movement of the first substrate 10 to the right is driven by the elastic force of the elastic structure 40. Wherein, in the initial position, the first base body 10 is disposed to be deviated from a position where the first base body 10 is aligned with the second base body 20 with respect to the second base body 20 in a direction opposite to the preset direction. Here, the position at which the first substrate 10 and the second substrate 20 are aligned (hereinafter, simply referred to as the aligned position) refers to a position at which the first substrate 10 and the second substrate 20 are positioned so that the imaging module is suitable for capturing a sharp image when no shake occurs. It will be appreciated that in practice, the first substrate 10 may be brought into a centered position with respect to the second substrate 20 by maintaining the SMA assembly 30 energized when no dither is being generated.

Through the above technical solution, when the shake needs to be compensated in the direction opposite to the preset direction at the initial position, the SMA assembly 30 may be powered to drive the first substrate 10 to move to the required position between the initial position and the centering position in the preset direction, but it should be noted that the initial position is the maximum stroke that can be compensated in the direction opposite to the preset direction, and the elastic structure 40 at the position is in a free state; when the shake does not need to be compensated, the SMA assembly 30 may be energized to move the first substrate 10 to be aligned with the second substrate 20 in the preset direction; when the shake needs to be compensated in the preset direction, the SMA assembly 30 may be further energized, for example, the current is increased, so that the first substrate 10 further moves from the centering position to the preset direction; in addition, when the vibration needs to be compensated in the opposite direction to the preset direction in the centering position, the current of the SMA assembly 30 can be reduced or cut off, and the elastic action of the elastic structure 40 is greater than the pulling force of the SMA assembly 30 to drive the first substrate 10 to move reversely to the required position. In the disclosed embodiment, the combination of the single direction driving of the SMA assembly 30 and the elastic structure 40 and the setting of the proper initial position of the first substrate 10 are used to realize the movement of the first substrate 10 in the opposite direction, so as to achieve the effect of compensating for the jitter. Therefore, only one-way motion of the SMA assembly 30 may be controlled, which may simplify the control scheme of the actuator, effectively reducing control costs as well as material costs.

Referring to fig. 1 to 4, the SMA assembly 30 may comprise a first SMA element 31 and a second SMA element 32, the first SMA element 31 being arranged to drive the first substrate 10 in a first direction and the second SMA element 32 being arranged to drive the first substrate 10 in a second direction, the first and second directions being at an angle to each other, e.g. the first direction may be perpendicular to the second direction. In this way, through the driving of the SMA assembly 30, the movement of the first base body 10 to two directions forming an angle with each other can be realized, and by combining the elastic structure 40, the first base body 10 can also move to two directions opposite to the first direction and the second direction respectively, so that the movement of the first base body 10 to four directions is realized, and the effect that the actuator has all-directional anti-shaking is ensured.

Specifically, as shown in fig. 1 to 4, the actuator may further include a metal plate 50, the first substrate 10 may be mounted on the metal plate 50, for example, may be mounted on the metal plate 50 by adhesion, and the metal plate 50 may be provided with a through hole suitable for mounting the optical element. The first SMA element 31 and the second SMA element 32 may be respectively connected between the metal plate 50 and the second substrate 20. When the SMA element is configured as an SMA wire, one end of the SMA wire may be connected to the second substrate 20 by a wire clamp 33 and the other end may be connected to the metal plate 50 by a wire clamp 33. Here, on the one hand, the metal plate 50 may provide convenience for mounting of the SMA assembly 30 and the first substrate 10, and on the other hand, the metal plate 50 may be electrically connected to a circuit board to be able to conduct electricity to the SMA assembly 30.

In summary, the elastic structure 40 may include a spring wire bent from the metal plate 50, and the end of the spring wire extending out of the metal plate 50 is connected to the second substrate 20. The spring wire is bent to provide elastic deformation space for the first substrate 10 to move in all directions, for example, in fig. 2, the spring wire may be a multi-segment zigzag structure, and the spring wire may be arranged at a corner between two SMA members to provide elastic deformation in two directions simultaneously; in fig. 4, the two spring wires may be bent along two adjacent edges of the metal plate 50, that is, each spring wire includes two segments, and each segment of the spring wire can provide elastic deformation for movement in one direction. The end of the spring wire may be provided with a connection portion 41, and the connection portion 41 may be directly connected to the second base 20 as shown in fig. 4, or may be connected to a mounting table 21 formed on the second base 20 as shown in fig. 2.

According to an embodiment of the present disclosure, the actuator may further include a support structure 60 disposed between the first substrate 10 and the second substrate 20 in a contact manner for supporting the first substrate 10 to move, the first substrate 10 and the second substrate 20 are usually made of plastic or other suitable materials that are not electrically conductive, and the support structure 60 may prevent the first substrate 10 from directly contacting the second substrate 20 during movement, which may result in abrasion of the first substrate 10 and the second substrate 20. Further, a metal support may be disposed on the second substrate 20, and the support structure 60 may be disposed between the metal plate 50 and the metal support in a contact manner, so that the metal is more resistant to abrasion, and the first substrate 10 and the second substrate 20 may be further prevented from being abraded by the support structure 60.

In one embodiment, the support structure 60 may include a ball bearing, as shown in fig. 1 and 3, which may be disposed at a plurality of locations for support. In another embodiment, a sliding shaft may be provided for supporting, for example, two sliding shafts may be provided, which are arranged in a cross manner, and the two sliding shafts may be respectively mounted on the first base 10 and the second base 20, and may move in contact with each other when the first base 10 moves, and in other embodiments, the supporting structure 60 may also be a combination of a ball and a sliding shaft, which is not limited in this disclosure.

Due to the characteristics of the SMA assembly 30 and the elastic structure 40, the driving manner of the two combined is not easy to precisely control the orientation of the first substrate 10, and therefore, in the embodiment of the present disclosure, referring to fig. 1 and 3, the actuator may further include a guiding structure 70 located between the first substrate 10 and the second substrate 20, for guiding the first substrate 10 to move toward a preset direction, so as to ensure that the driving direction of the actuator is more precise, and to ensure a clear imaging effect.

Specifically, as described above, the SMA assembly 30 is configured to be able to drive the first base body 10 to move in the first direction and the second direction at an angle to the first direction, one of the first base body 10 and the guide structure 70 is formed with the first slide groove 81 extending in the first direction, the other is formed with the first protrusion 91 that is able to protrude into the first slide groove 81 and is able to move relative to the first slide groove 81 in the first direction, one of the second base body 20 and the guide structure 70 is formed with the second slide groove 82 extending in the second direction, and the other is formed with the second protrusion 92 that is able to protrude into the second slide groove 82 and is able to move relative to the second slide groove 82 in the second direction. Here, the first slide groove 81, the first protrusion 91, the second slide groove 82, and the second protrusion 92 are described as an example of the first base 10, the guide structure 70, the second base 20, and the guide structure 70, respectively, and in addition, when the metal plate 50 is provided, the first slide groove 81 may be formed in the metal plate 50. When the first substrate 10 needs to move in the first direction or the direction opposite to the first direction, the first substrate 10 drives the guiding structure 70 to move along the second sliding slot 82 synchronously because the slot wall of the first sliding slot 81 stops the first protrusion 91; when the first base 10 needs to move to the second direction, the first base 10 will move along the first sliding groove 81, and the guiding structure 70 will remain fixed in synchronization with the second base 20. Here, the guide structure 70 may be configured in a bar shape having two sections extending in the first and second directions, and the number of each protrusion may be plural, respectively, to prevent the first substrate 10 from rotating when moving, ensuring a guiding effect.

In the embodiment of the disclosure, an electronic device, such as a mobile terminal like a mobile phone, or a monitoring device, is also provided. The electronic equipment comprises the actuator and the camera module, and has all the advantages of the actuator and the camera module, and the details are not repeated.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. An optical actuator comprising a first substrate (10), a second substrate (20), an SMA component (30), and a resilient structure (40), the SMA assembly (30) and the resilient structure (40) being connected between the first and second substrates (10, 20) respectively, the SMA component (30) is configured to drive the first substrate (10) to move in a preset direction relative to the second substrate (20) after being electrified, the resilient structure (40) is configured to generate a resilient force resisting movement of the first substrate (10) upon energisation of the SMA assembly (30), wherein, in an initial position, the first base (10) is arranged offset with respect to the second base (20) in a direction opposite to the preset direction from a position in which the first base (10) is aligned with the second base (20).

2. An optical actuator according to claim 1, wherein the SMA assembly (30) comprises a first SMA element (31) and a second SMA element (32), the first SMA element (31) being arranged to drive the first substrate (10) in a first direction and the second SMA element (32) being arranged to drive the first substrate (10) in a second direction, the first and second directions being at an angle to each other.

3. An optical actuator according to claim 2, characterized in that the actuator further comprises a metal plate (50), the first base (10) being mounted to the metal plate (50), the first SMA element (31) and the second SMA element (32) being connected between the metal plate (50) and the second base (20), respectively.

4. An optical actuator according to claim 3, wherein the resilient structure (40) comprises a spring wire bent from the metal plate (50), the end of the spring wire protruding from the metal plate (50) being connected to the second substrate (20).

5. An optical actuator according to claim 3, wherein the second substrate (20) is provided with a metal support, the actuator further comprising a support structure (60) arranged in contact between the metal plate (50) and the metal support for supporting the first substrate (10) in motion.

6. An optical actuator according to claim 5, wherein the support structure (60) comprises a ball and/or a slide shaft.

7. An optical actuator according to any of claims 1-6, characterized in that the actuator further comprises a guiding structure (70) between the first substrate (10) and the second substrate (20) for guiding the first substrate (10) towards the predetermined direction.

8. An optical actuator according to claim 7, wherein the SMA assembly (30) is configured to be able to drive the first substrate (10) in a first direction and a second direction at an angle to the first direction, one of the first base body (10) and the guide structure (70) is formed with a first slide groove (81) extending in a first direction, and the other is formed with a first projection (91) capable of projecting into the first slide groove (81) and capable of moving relative to the first slide groove (81) in the first direction, one of the second base body (20) and the guide structure (70) is formed with a second slide groove (82) extending in a second direction, and the other is formed with a second projection (92) that can protrude into the second slide groove (82) and can move relative to the second slide groove (82) in the second direction.

9. A camera module, characterized in that it comprises an optical actuator according to any one of claims 1-8.

10. An electronic apparatus characterized by comprising the camera module according to claim 9.

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