CN212207804U

CN212207804U - SMA actuator, camera module, and electronic apparatus

Info

Publication number: CN212207804U
Application number: CN202020595213.4U
Authority: CN
Inventors: 刘述伦; 计树标; 蔡日新
Original assignee: Dongguan Yadeng Electronics Co Ltd
Current assignee: Guangdong haideya Technology Co.,Ltd.
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-12-22
Anticipated expiration: 2030-04-20

Abstract

The utility model discloses a SMA actuator, camera module and electronic equipment. The SMA actuator comprises an SMA wire driving mechanism and a driven piece, the SMA wire driving mechanism comprises an SMA wire, a connecting rod, a supporting part and a first elastic arm, the SMA wire can be electrified and contracted, and one end of the connecting rod is connected with the SMA wire; the first elastic arm can be elastically bent, one end of the first elastic arm is connected with the connecting rod, and the other end of the first elastic arm is connected with the supporting part; two SMA wire driving mechanisms which are arranged oppositely are arranged on the side face of the driven piece, one end of a connecting rod of each SMA wire driving mechanism is hinged with the driven piece, the SMA wires can drive the connecting rods to swing relative to the supporting portion through contraction so as to drive the driven piece to move, and the directions of the two SMA wire driving mechanisms driving the driven piece to move are opposite. Has the advantages that: the displacement of the driven part can be larger than the contraction of the SMA wire, so that a larger stroke of the driven part can be realized under the condition that the SMA actuator is smaller in size, and the driven part can be driven to move in different directions by a larger driving force.

Description

SMA actuator, camera module, and electronic apparatus

Technical Field

The utility model relates to an electron field, in particular to SMA actuator, camera module and electronic equipment.

Background

An actuator (activating device) is a driving mechanism commonly used in the electronic field, and can be used for driving a camera. SMA refers to shape memory alloy (shape memory alloy) which is a driving element in an actuator. SMA is a material composed of two or more metal elements having a Shape Memory Effect (SME) by thermoelastic and martensitic transformation and inversion thereof. SMA can be deformed at a lower temperature and can restore the shape before deformation after being electrified and heated, thereby realizing electrically-controlled contraction.

However, the existing SMA actuators have small driving force, have poor driving effect on a driven part with large mass, and can only move the driven part to one direction.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least, for this reason, the utility model provides a SMA actuator, camera module and electronic equipment. The SMA actuator is compact in structure, small in size, high in driving force and capable of driving the driven piece to move in the opposite direction.

According to the utility model discloses SMA actuator of first aspect embodiment, including SMA wire actuating mechanism and driven piece, SMA wire actuating mechanism includes SMA wire, connecting rod, supporting part and first elastic arm, but SMA wire circular telegram shrink, one end of connecting rod with SMA wire is connected; the first elastic arm can be elastically bent, one end of the first elastic arm is connected with the connecting rod, and the other end of the first elastic arm is connected with the supporting part; the side of the driven piece is provided with two SMA wire driving mechanisms which are arranged oppositely, one end of the connecting rod of each SMA wire driving mechanism is hinged with the driven piece, the SMA wires can drive the connecting rod to swing relative to the supporting part through contraction so as to drive the driven piece to move, and the two SMA wire driving mechanisms drive the driven piece to move in opposite directions.

According to the utility model discloses SMA actuator of first aspect embodiment has at least following technological effect: the first elastic arm enables the connecting rod to elastically swing relative to the supporting part, so that the displacement of the driven part can be larger than the contraction of the SMA wire, and a larger stroke of the driven part can be realized under the condition that the SMA actuator is smaller in size, and the miniaturization of the SMA actuator is facilitated; two SMA wire driving mechanisms which are arranged oppositely are arranged on the side surface of the driven piece, the driving force is larger, the driven piece with larger mass can be driven, and the SMA wire driving mechanisms are arranged oppositely, so that the driven piece can move towards two opposite directions, and the moving direction of the driven piece is more selected.

According to some embodiments of the invention, each of the SMA actuation mechanisms comprises two and symmetrical arrangements of the support portions, the first resilient arms and the connecting rods.

According to some embodiments of the present invention, the two SMA wire drive mechanisms are a first SMA wire drive mechanism and a second SMA wire drive mechanism, respectively; the supporting parts are respectively a first supporting part, a second supporting part and a third supporting part; one of the two connecting rods of the first SMA wire driving mechanism is connected with the first supporting part, and the other connecting rod of the first SMA wire driving mechanism is connected with the second supporting part; one of the two connecting rods of the second SMA wire driving mechanism is connected with the first supporting part, the other one is connected with the third supporting part, the first supporting part forms a public end, the second supporting part forms a first control end, and the third supporting part forms a second control end.

According to some embodiments of the invention, the support portion, the first resilient arm and the connecting rod are integrally formed by a conductive material.

According to a second aspect of the present invention, a camera module comprises an SMA actuator according to the first aspect of the present invention.

According to the utility model discloses camera module has following technological effect at least: the volume is miniaturized, and the camera lens moves, focuses and prevents trembling more easily.

According to some embodiments of the utility model, still include lens subassembly and base subassembly, the lens subassembly includes the mirror holder body, it does to be driven the mirror holder body, the base subassembly includes the base body, the supporting part with base body fixed connection, the mirror holder body with movably between the base body is connected, the SMA actuator can drive the mirror holder body is relative the base body motion.

According to some embodiments of the invention, the number of SMA actuators is two or four and is arranged symmetrically with respect to the mirror housing.

According to the utility model discloses a some embodiments, the edge of the base body is provided with the spliced pole, the equal fixed connection of supporting part is in the spliced pole side.

According to some embodiments of the present invention, the lens assembly further comprises a spring, the spring is provided with a second elastic arm, the spring is fixedly connected with the lens frame body, and is connected with the base body through the second elastic arm; the second elastic arm enables the spring to support the frame body and enables the frame body to move relative to the base body.

According to a third aspect of the present invention, an electronic device includes the SMA actuator according to the first aspect of the present invention or the camera module according to the second aspect of the present invention.

According to the utility model discloses electronic equipment has following technological effect at least: the size of the electronic equipment is favorably miniaturized, the carrying is more favorably realized, and the lens is easier to move, focus and prevent shaking.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above-mentioned additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a camera module according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of a camera module according to an embodiment of the present invention;

fig. 3 is a schematic diagram of four SMA actuator arrangements according to an embodiment of the invention;

fig. 4 is a schematic structural diagram of a lens assembly according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a base assembly according to an embodiment of the present invention.

Reference numerals:

a first SMA wire 111, a second SMA wire 112, a first link 121, a second link 122, a first elastic arm 130, a first support 141, a second support 142, a third support 143,

A frame body 210, a spring 220, a second elastic arm 230,

A base body 310, a connecting column 320, a common end 330, a first control end 340, and a second control end 350.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

An SMA actuator according to an embodiment of the invention is described below with reference to fig. 1 to 5.

According to the embodiment of the utility model, the SMA actuator comprises an SMA wire driving mechanism and a driven piece, the SMA wire driving mechanism comprises an SMA wire, a connecting rod, a supporting part and a first elastic arm 130, the SMA wire can be electrified and contracted, and one end of the connecting rod is connected with the SMA wire; the first elastic arm 130 is elastically bendable, one end of which is connected with the connecting rod and the other end of which is connected with the supporting part; two SMA wire driving mechanisms which are arranged oppositely are arranged on the side face of the driven piece, one end of a connecting rod of each SMA wire driving mechanism is hinged with the driven piece, the SMA wires can drive the connecting rods to swing relative to the supporting portion through contraction so as to drive the driven piece to move, and the directions of the two SMA wire driving mechanisms driving the driven piece to move are opposite.

For example, as shown in fig. 1 and fig. 3, the two SMA wire drive mechanisms are a first SMA wire drive mechanism and a second SMA wire drive mechanism, respectively, the SMA wire of the first SMA wire drive mechanism is a first SMA wire 111, the link is a first link 121, the SMA wire of the second SMA wire drive mechanism is a second SMA wire 112, and the link is a second link 122.

SMA wire is a shape memory alloy wire that can achieve length contraction before and after energization. The first SMA wire 111 is connected to the first link 121, and the second SMA wire 112 is connected to the second link 122. One ends of the first link 121 and the second link 122 are connected to the support portion through a first elastic arm 130, and can swing with respect to the support portion. In some embodiments of the present invention, the shape of the first elastic arm 130 connected to the first link 121 is U-shaped, and the shape of the first elastic arm 130 connected to the second link 122 is bar-shaped, and the shape of the first elastic arm 130 can be changed according to actual conditions.

One end of each of the first connecting rod 121 and the second connecting rod 122 is hinged to the driven member; the first SMA wire drive mechanism is located opposite the second SMA wire drive mechanism, with the first link 121 located between the first SMA wire 111 and the second link 122 located between the first link 121 and the second SMA wire 112, as shown for example in fig. 3.

When the first SMA wire 111 is electrified and contracted, the first link rod 121 can be driven to swing relative to the support part so as to drive the driven part to move, and when the second SMA wire 112 is electrified and contracted, the second link rod 122 can be driven to swing relative to the support part so as to drive the driven part to move. Because the positions of the first connecting rod 121 and the first SMA wire 111 and the positions of the second connecting rod 122 and the second SMA wire 112 relative to the base body 310 are different, the driven piece can be driven to move in the opposite direction. When the driven piece needs to move to one side, the current on the SMA wire on the side is reduced, the swing angle of the connecting rod connected with the connecting rod relative to the supporting part is reduced, the current intensity on the SMA wire on the opposite side is increased, the swing angle of the connecting rod connected with the connecting rod relative to the supporting part is increased, the two SMA driving mechanisms work together, and therefore the driving force of the SMA actuator is increased.

The first and second SMA wire drive mechanisms are oppositely disposed so as to drive the driven member from opposite directions. The first elastic arm 130 enables the first connecting rod 121 and the second connecting rod 122 to elastically swing relative to the supporting portion, and a certain included angle is formed between the SMA wire and the connecting rods, so that the displacement of the driven piece is larger than the contraction of the SMA wire, and a larger stroke of the driven piece can be realized under the condition that the SMA actuator is small in size, and the miniaturization of the SMA actuator is facilitated. And the SMA actuator has a greater driving force and can drive a greater mass of the driven member.

In some embodiments of the present invention, the number of the support portions, the first elastic arms 130 and the connecting rods in each SMA drive mechanism is two and arranged symmetrically.

For example, as shown in fig. 1 and 3, the first SMA wire driving mechanism includes two supporting portions, a first elastic arm 130 and two first links 121, and the second SMA wire driving mechanism includes two supporting portions, a first elastic arm 130 and two second links 122, the two first links 121 are arranged in bilateral symmetry with respect to the driven member, the two second links 122 are arranged in bilateral symmetry with respect to the driven member, and the first elastic arm 130 connected thereto is also arranged in symmetry, so that stability of the driven member during movement can be enhanced.

Both ends of the first SMA wire 111 are connected to one ends of the two first links 121, respectively, so that the two first links 121 symmetrically arranged may be simultaneously driven when the first SMA wire 111 contracts. Both ends of the second SMA wire 112 are connected to one ends of two second connecting rods 122, respectively, so that the two symmetrically arranged second connecting rods 122 can be driven simultaneously when the second SMA wire 112 is contracted.

In some embodiments of the present invention, the two SMA wire drive mechanisms are a first SMA wire drive mechanism and a second SMA wire drive mechanism, respectively; the supporting parts are a first supporting part 141, a second supporting part 142 and a third supporting part 143, respectively; one of the two links of the first SMA wire drive mechanism is connected to the first support 141, and the other is connected to the second support 142; one of the two links of the second SMA wire drive mechanism is connected to the first support portion 141 and the other is connected to the third support portion 143. The first support 141 forms a common terminal 330, the second support 142 forms a first control terminal 340, and the third support 143 forms a second control terminal 350.

For example, as shown in fig. 2 and 3, the first SMA wire driving mechanism and the second SMA wire driving mechanism are disposed opposite to each other in the up-down direction with respect to the driven member, so that the driven member can be driven from opposite directions, and the driven member can move in more directions, which is beneficial to expanding the focusing and anti-shake functions of the camera module. The first SMA wire driving mechanism includes two first connecting rods 121, one end of one first connecting rod 121 is hinged to the driven member, the other end is connected to the first supporting portion 141 through a first elastic arm 130, one end of the other first connecting rod 121 is hinged to the driven member, and the other end is connected to the second supporting portion 142 through the first elastic arm 130. The second SMA wire driving mechanism includes two second connecting rods 122, one end of one second connecting rod 122 is hinged to the driven member, the other end is connected to the first supporting portion 141 through the first elastic arm 130, and one end of the other second connecting rod 122 is hinged to the driven member, and the other end is connected to the third supporting portion 143 through the first elastic arm 130.

The first support portion 141 is connected with a first link 121 and a second link 122, the second support portion 142 is connected with a first link 121, the third support portion 143 is connected with a second link 122, the first support portion 141 forms a common end 330, the second support portion 142 forms a first control end 340, and the third support portion 143 forms a second control end 350. By such arrangement, when the SMA actuator needs to work, a positive pole or a negative pole can be arranged at the common end 330, and opposite negative poles or positive poles are arranged at the second control end 340 and the third control end 350, so that when the first connecting rod 121 needs to increase the swing amplitude, the current intensity between the common end 330 and the first control end 340 can be enhanced, and the current intensity between the common end 330 and the second control end 350 can be weakened, so that the first SMA wire 111 increases the contraction degree, and the second SMA wire 112 decreases the contraction degree, so that the first connecting rod 121 swings to a larger extent relative to the supporting part to drive the driven part to move downwards; when the second connecting rod 122 needs to increase the swing amplitude, the current intensity between the common end 330 and the second control end 350 can be enhanced, and the current intensity between the common end 330 and the first control end 340 can be weakened, so that the second SMA wire 112 can increase the contraction degree, the first SMA wire can reduce the contraction degree, and the second connecting rod 122 can swing to a larger extent relative to the supporting part to drive the driven part to move upwards. The first support part 141 is simultaneously connected with the first connecting rod 121 and the second connecting rod 122 to be integrally formed, so that the structural strength of the SMA actuator can be enhanced, the second support part 142 is connected with the first connecting rod 121, and the third support part 143 is connected with the second connecting rod 122, so that a first SMA wire driving mechanism and a second SMA wire driving mechanism of the SMA actuator can respectively move and are convenient to control.

By such arrangement, the SMA actuator can realize precise control on the driven member, the degree of contraction of the first SMA wire 111 is controlled by controlling the current intensity between the first control end 340 and the common end 330, and the degree of contraction of the second SMA wire 112 is controlled by controlling the current intensity between the second control end 350 and the common end 330 so as to control the driven member to move upwards or downwards, so that precise control is realized.

In some embodiments of the present invention, the supporting portion, the first elastic arm 130 and the connecting rod are integrally formed by a conductive material.

For example, as shown in fig. 1 and 3, the support portion, the first elastic arm 130 and the link are integrally formed by a conductive material. The support part, the first elastic arm 130 and the connecting rod are integrally formed, so that the manufacturing difficulty and cost of the SMA actuator are reduced, the support part, the first elastic arm 130 and the connecting rod can be made of an SMA wire by conductive materials, and the overall circuit structure of the SMA actuator is simplified.

More specifically, the supporting portion, the first elastic arm 130 and the link are integrally formed by a metal conductive material, which has both conductivity and good elasticity.

According to the camera module of the embodiment of the present invention, as shown in fig. 1 and fig. 2, the camera module has a smaller volume and is easier to carry, and the lens is easier to move, focus and prevent shaking.

In some embodiments of the present invention, the camera module further includes a lens assembly and a base assembly, the lens assembly includes a lens frame body 210, the driven member is the lens frame body 210, the base assembly includes a base body 310, the supporting portion is fixedly connected to the base body 310, the lens frame body 210 is movably connected to the base body 310, and the SMA actuator can drive the lens frame body 210 to move relative to the base body 310.

For example, as shown in fig. 1 and 2, the camera module includes a lens assembly and a base assembly, the lens assembly includes a lens frame body 210, the driven member is a lens frame body 210, the base assembly includes a base body 310, the supporting portion is fixedly connected with the base body 310, the lens frame body 210 is movably connected with the base body 310, and the SMA actuator can drive the lens frame body 210 to move relative to the base body 310. The lens body 210 can be provided with a lens to realize an imaging function, and the SMA actuator can drive the lens body 210 to move, so that focusing or anti-shaking of the lens can be realized. The mirror frame body 210 is provided with a convex hinge post, one end of the connecting rod is provided with a hinge ring, and the hinge ring is sleeved on the hinge post to form a hinge mechanism.

By the arrangement, the SMA actuator can accurately control the driven part, the degree of contraction of the first SMA wire 111 is controlled by controlling the intensity of current flowing through the first SMA wire 111 so as to control the degree of upward movement of the driven part, and the degree of contraction of the second SMA wire 112 is controlled by controlling the intensity of current flowing between the second SMA wires 112 so as to control the degree of downward movement of the driven part, so that accurate control is realized.

In some embodiments of the present invention, the number of SMA actuators is two or four, and are symmetrically arranged with respect to the frame body 210.

For example, as shown in fig. 1 and fig. 3, in the present embodiment, the image capturing module includes four SMA actuators, which are symmetrically disposed about the frame body 210, and the SMA actuators are respectively symmetrically disposed about the frame body 210, and by respectively detecting or controlling each SMA actuator, the detection or control of the inclination angle and the displacement of the frame body 210 can be achieved, which is beneficial to further expanding the functions of the image capturing module. When the number of SMA actuators is two, also symmetrically arranged with respect to the housing body 210, detection or control of the inclination angle and displacement of the housing body 210 can also be achieved. It will be appreciated that when the camera module is provided with four SMA actuators, the lens of the camera module can be rotated in more directions.

In some embodiments of the present invention, the corner of the base body 310 is provided with a connecting column 320, and the supporting portion is fixedly connected to the side of the connecting column 320.

For example, as shown in fig. 2 and 5, four connecting columns 320 are disposed at four corners of the base body 310, and the first support 141, the second support 142, and the third support 143 are all fixedly connected to the sides of the connecting columns 320. In this embodiment, four SMA actuators are provided, including four common terminals 330, four first control terminals 340 and four second control terminals 350, where the common terminals 330 or the control terminals of two adjacent SMA actuators are disposed close to each other on the side of the same connecting column 320, as shown in fig. 3, so that the common terminals 330 are connected to a positive electrode or a negative electrode, and the control terminals are connected to a negative electrode or a positive electrode opposite to the common terminals 330.

Through so setting up for the better restriction of frame body 210 times is in base body 310 to the supporting part has fixed the side of connecting at spliced pole 320 and has made the SMA actuator more stable fix on camera module, and the common port 330 of two adjacent SMA brakes or the control end are close to each other and set up on the side of same spliced pole 320, make things convenient for common port 330 to lead to anodal or negative pole, and the control end leads to the negative pole or the positive pole opposite with common port 330.

In some embodiments of the present invention, the lens assembly further includes a spring 220, the spring 220 is provided with a second elastic arm 230, the spring 220 is fixedly connected to the lens frame body 210, the spring 220 is connected to the base body 310 through the second elastic arm 230, and the second elastic arm 230 enables the spring 220 to support the lens frame body 210 and enables the lens frame body 210 to move relative to the base body 310.

As shown in fig. 2 and 4, for example, the springs 220 are attached to the respective sides of the frame body 210. The spring 220 and the second elastic arm 230 are integrally formed metal sheets, and the spring 220 and the second elastic arm 230 are disposed on both sides of the frame body 210. The second resilient arm 230 allows the frame body 210 to be resiliently suspended from the base body 310, thereby allowing the frame body 210 to be easily actuated by the respective SMA actuators.

The spring 220 constitutes a suspension system for the lens assembly. Here, the spring 220 does not refer to a coil spring, a spiral spring or a plate spring which is commonly used in the mechanical field, but a profile spring which is specially used for suspending the lens assembly. The spring 220 is thin and attached to the frame body 210 from both sides of the lens assembly.

According to the utility model discloses electronic equipment of third aspect embodiment, include according to the utility model discloses SMA actuator of first aspect embodiment or according to the camera module of second aspect embodiment. The miniaturization of the volume of the SMA actuator is beneficial to the miniaturization of the volume of electronic equipment and is more beneficial to carrying.

An SMA actuator according to an embodiment of the present invention is described in detail below in one specific embodiment with reference to fig. 1 to 5. It is to be understood that the following description is illustrative only and is not intended as a specific limitation on the invention.

As shown in fig. 3, the SMA actuator includes a first SMA wire driving mechanism and a second SMA wire driving mechanism, the first SMA wire driving mechanism includes a first SMA wire 111, a first link 121, a first support 141, a second support 142, a first elastic arm 130, and a driven member, two ends of the first SMA wire 111 are respectively connected to one ends of the two first links 121, one end of the first link 121 is connected to the first support, and the other end is connected to the driven member, the first support 141 forms a common end 330, and the second support forms a first control end 340.

The second SMA wire driving mechanism includes a second SMA wire 112, second links 122, a first support 141, a third support 143, a first elastic arm 130 and a driven member, two ends of the second SMA wire 112 are respectively connected with one end of the two second links 122, one end of the second link 122 is connected with one end of the first support, the other end of the second link 122 is connected with the driven member, the first support 141 forms a common end 330, and the third support 143 forms a second control end 350, as shown in fig. 1, for example.

One ends of the first link 121 and the second link 122 are connected to the support portion through a first elastic arm 130, and can swing with respect to the support portion. The first elastic arm 130 is made of elastic material, one end of the first elastic arm 130 is connected to the support portion, and the other end of the first elastic arm 130 is connected to the first link 121 or the second link 122, so that the first elastic arm can be bent when the SMA wire contracts. The first elastic arm 130 connected with the first link 121 is U-shaped, the first elastic arm 130 connected with the second link 122 is bar-shaped, and the first elastic arm 130 is U-shaped, which is beneficial to enhancing the deformability of the first elastic arm 130, so that the stroke of the driven member can be further increased.

The support part, the first elastic arm 130 and the connecting rod are integrally formed by conductive materials, the support part is fixed on the side surface of the connecting column 320 of the base body 310, and one ends of the first connecting rod 121 and the second connecting rod 122 are respectively hinged with the driven part; the first link 121 is located between the first SMA wire 111 and the second link 122, and the second link 122 is located between the first link 121 and the second SMA wire 112, as shown in fig. 3, for example.

When the common end 330 and the first control end 340 are powered on, the first SMA wire 111 is powered on and contracted to drive the first link 121 to swing relative to the support part so as to drive the driven part to move downwards; when the common end 330 and the second control end 350 are energized, the second SMA wire 112 is energized and contracted to drive the second link 122 to swing relative to the support portion, so as to drive the driven member to move upward. Because the positions of the first connecting rod 121 and the first SMA wire 111 and the positions of the second connecting rod 122 and the second SMA wire 112 relative to the base body 310 are different, the driven piece can be driven to move in the opposite direction.

According to the utility model discloses SMA actuator, through so setting, can reach some following technological effects at least: the first SMA wire driving mechanism and the second SMA wire driving mechanism are oppositely arranged, so that the driven piece can be driven from more directions, and the two SMA wire driving mechanisms can bring larger driving force to drive the driven piece with larger mass. The first elastic arm 130 enables the first connecting rod 121 and the second connecting rod 122 to elastically swing relative to the supporting portion, a certain included angle is formed between the SMA wire and the connecting rods, and the displacement of the driven member is larger than the contraction of the SMA wire, so that a larger stroke of the driven member can be realized under the condition that the SMA actuator is small in size, and the miniaturization of the SMA actuator is facilitated.

The following describes a camera module according to an embodiment of the present invention in detail in a specific embodiment with reference to fig. 1 to 5. It is to be understood that the following description is illustrative only and is not intended as a specific limitation on the invention.

The camera module comprises a lens assembly, a base assembly and four SMA actuators of the above embodiments, the lens assembly comprises a lens frame body 210, the driven member is a lens frame body 210, the base assembly comprises a base body 310, the supporting portion is fixedly connected with the side surface of the connecting column 320 on the base body 310, the lens frame body 210 is movably connected with the base body 310, and the SMA actuator can drive the lens frame body 210 to move relative to the base body 310. The lens body 210 can be provided with a lens to realize an imaging function, and the SMA actuator can drive the lens body 210 to move, so that focusing or anti-shaking of the lens can be realized.

Such as shown in fig. 2 and 5. The first support 141 of each SMA actuator forms the common terminal 330 and the second and

third supports

142, 143 of each SMA actuator form the first and

second control terminals

340, 350, respectively. The degree of electrical contraction of each SMA wire is controlled by controlling the current intensity between each control terminal and the common terminal 330, thereby controlling the movement of the mirror plate.

In this embodiment, four common terminals 330, four first control terminals 340 and four second control terminals 350 are provided, where the common terminals 330 or the control terminals of two adjacent SMA brakes are close to each other, as shown in fig. 3, so that the common terminals 330 are connected to a positive electrode or a negative electrode, and the control terminals are connected to an electrode opposite to the common terminals 330.

The four SMA actuators are symmetrically arranged with respect to the frame body 210, and by respectively detecting or controlling each SMA actuator, detection or control of the inclination angle and displacement of the frame body 210 can be achieved, which is beneficial to further expanding the functions of the camera module.

The spring 220 is attached to both sides of the frame body 210. The spring 220 and the second resilient arm 230 are integrally formed metal sheets. The second resilient arm 230 allows the frame body 210 to be resiliently suspended from the base body 310, thereby making the frame body 210 easier to drive by the SMA actuator.

The spring 220 constitutes a suspension system for the lens assembly. Here, the spring 220 does not refer to a coil spring, a spiral spring or a plate spring which is commonly used in the mechanical field, but a profile spring which is specially used for suspending the lens assembly. The spring 220 is thin and attached to the frame body 210 from two sides of the lens assembly.

According to the utility model discloses camera module, through so setting up, can reach some effects as follows at least: the volume is smaller and more portable, the lens is easier to focus and anti-shake, the SMA actuators are respectively and symmetrically arranged about the lens frame body 210, and the detection or control of the inclination angle and displacement of the lens frame body 210 can be realized by respectively detecting or controlling the SMA actuators, so that the function of the camera module can be further expanded. The second resilient arm 230 allows the frame body 210 to be resiliently suspended from the base body 310, thereby allowing the frame body 210 to be easily driven over the various SMA actuators. The SMA actuator drives more force and can drive a larger mass of the mirror housing 210.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

An SMA actuator, comprising:

the SMA wire driving mechanism comprises an SMA wire, a connecting rod, a supporting part and a first elastic arm, the SMA wire can be electrified and contracted, and one end of the connecting rod is connected with the SMA wire; the first elastic arm can be elastically bent, one end of the first elastic arm is connected with the connecting rod, and the other end of the first elastic arm is connected with the supporting part;

the side surface of the driven part is provided with two SMA wire driving mechanisms which are arranged oppositely, one end of the connecting rod of each SMA wire driving mechanism is hinged with the driven part, the SMA wires can drive the connecting rod to swing relative to the supporting part through contraction so as to drive the driven part to move, and the two SMA wire driving mechanisms drive the driven part to move in opposite directions.
2. The SMA actuator of claim 1, wherein the number of the support portions, first resilient arms, and links in each SMA drive mechanism is two and arranged symmetrically.
3. The SMA actuator of claim 2, wherein the two SMA wire drive mechanisms are a first SMA wire drive mechanism and a second SMA wire drive mechanism, respectively; the supporting parts are respectively a first supporting part, a second supporting part and a third supporting part; one of the two connecting rods of the first SMA wire driving mechanism is connected with the first supporting part, and the other connecting rod of the first SMA wire driving mechanism is connected with the second supporting part; one of the two connecting rods of the second SMA wire driving mechanism is connected with the first supporting part, the other one is connected with the third supporting part, the first supporting part forms a public end, the second supporting part forms a first control end, and the third supporting part forms a second control end.
4. An SMA actuator according to any one of claims 1 through 3, wherein the support portion, first resilient arm and link are integrally formed from an electrically conductive material.
5. A camera module, characterized in that it comprises an SMA actuator according to any one of claims 1 to 4.
6. The camera module of claim 5, further comprising a lens assembly and a base assembly, wherein the lens assembly includes a frame body, the driven member is the frame body, the base assembly includes a base body, the support portion is fixedly coupled to the base body, the frame body is movably coupled to the base body, and the SMA actuator drives the frame body to move relative to the base body.
7. A camera module according to claim 6, wherein the number of SMA actuators is two or four and are symmetrically arranged with respect to the mirror housing.
8. The camera module according to claim 6, wherein a connecting column is provided at a corner of the base body, and the supporting parts are both fixedly connected to side surfaces of the connecting column.
9. The camera module of claim 6, wherein the lens assembly further comprises a spring, the spring having a second resilient arm, the spring being fixedly coupled to the frame body and coupled to the base body via the second resilient arm; the second elastic arm enables the spring to support the frame body and enables the frame body to move relative to the base body.
10. An electronic device comprising the SMA actuator of any one of claims 1 to 4 or the camera module of any one of claims 5 to 9.