CN109901275B

CN109901275B - Method of winding SMA wire on optical assembly

Info

Publication number: CN109901275B
Application number: CN201711299077.3A
Authority: CN
Inventors: 陈振宇; 涂洪德; 方银丽; 邱辉
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2017-12-08
Filing date: 2017-12-08
Publication date: 2021-05-18
Anticipated expiration: 2037-12-08
Also published as: CN109901275A; WO2019109733A1

Abstract

A method of winding SMA wire on an optical assembly, wherein the optical assembly includes a lens module having an outer frame and a fixture disposed at a set of diagonal regions of the lens module, the method comprising: mounting the SMA wires around the outer frame to form four sides opposite each other in pairs, wherein on each side the SMA wires comprise a first SMA wire and a second SMA wire arranged to cross each other without contacting, wherein the SMA wires are in a taut state during mounting.

Description

Method of winding SMA wire on optical assembly

Technical Field

The present application relates to a method of winding Shape Memory Alloy (SMA) wire on an optical component.

Background

The optical components on the existing intelligent equipment basically realize automatic focusing by driving the lens to move longitudinally through the motor mechanism, but a certain movement stroke is required for driving the lens to move longitudinally through the motor carrier, so that a reserved space needs to be reserved for the longitudinal movement of the lens in the intelligent equipment. Use the smart mobile phone as an example, it is thinner more to do along with the smart mobile phone, can leave for optical assembly's usable space in the cell-phone and more and less, and the motor carrier needs the magnetite drive coil to produce certain thrust and just can drive the camera lens and realize longitudinal motion, wherein, the magnetite occupies great volume in the motor inside, and can reach a definite value for thrust, the volume of magnetite hardly reduces again, therefore, need not reducing under the prerequisite of magnetite volume, improve the motor structure, reduce the volume of motor, and then reduce cell-phone optical assembly's volume.

Shape Memory alloy, Shape Memory Alloys, SMA for short. The SMA wire can eliminate the deformation at lower temperature after heating and restore the original shape before deformation, so that the lens can be driven to move by the SMA wire instead of a motor. The SMA wire has a smaller volume compared with the traditional motor, can effectively reduce the overall size of the module, and is beneficial to the miniaturization development of the module.

Disclosure of Invention

The present application is directed to a method for winding SMA wires on an optical assembly, and an optical assembly formed thereby, and a camera module and a smart device having the optical assembly are expected to have a small volume and to achieve auto-focusing and optical anti-shake under the driving of the SMA wires.

According to the present application, there is provided a method of winding SMA wire on an optical assembly, wherein the optical assembly comprises a lens module having an outer frame and a fixture disposed at a set of diagonal regions of the lens module, the method comprising: mounting the SMA wires around the outer frame to form four sides opposite each other in pairs, wherein on each side the SMA wires comprise a first SMA wire and a second SMA wire arranged to cross each other without contacting, wherein the SMA wires are in a taut state during mounting.

In one embodiment, the four sides are formed as rectangles.

In one embodiment, the outer frame comprises a first support and a second support in a further pair of diagonal regions corresponding to each side; fixing device all has first fixed part and the second fixed part that corresponds respectively with first supporting part and second supporting part on the stationary plane that corresponds respectively with every side, and it includes to install the SMA line around outer frame: when the lens module is close to one corner region of the other pair of corner regions, supporting the movable end of the first SMA wire on a first supporting part, fixing two fixed ends of the first SMA wire on a first fixing part, supporting the movable end of the second SMA wire on a second supporting part, and fixing two fixed ends of the second SMA wire on a second fixing part at each of two adjacent side surfaces of the outer frame in the one corner region; and when the lens module approaches to the other corner region of the other pair of corner regions, supporting the movable end of the first SMA wire on the first supporting part, fixing the two fixed ends of the first SMA wire on the first fixing part, supporting the movable end of the second SMA wire on the second supporting part, and fixing the two fixed ends of the second SMA wire on the second fixing part at each of the two adjacent side surfaces of the outer frame at the other corner region.

In one embodiment, the first fixing portion includes a first power supply fixing portion and a first ground fixing portion, and the second fixing portion includes a second power supply fixing portion and a second ground fixing portion, wherein mounting the SMA wire around the outer frame includes: when the lens module is close to one corner region in the other pair of corner regions, supporting a movable end of a first SMA wire at a first supporting part, fixing two fixed ends of the first SMA wire at a first power source fixing part and a first ground wire fixing part respectively, supporting a movable end of a second SMA wire at a second supporting part, and fixing two fixed ends of the second SMA wire at a second power source fixing part and a second ground wire fixing part respectively, on each of two adjacent side surfaces of the outer frame, which are located in one corner region; and when the lens module approaches to another corner region in the another pair of corner regions, supporting the movable end of the first SMA wire at the first supporting portion, fixing the two fixed ends of the first SMA wire at the first power source fixing portion and the first ground wire fixing portion, respectively, and supporting the movable end of the second SMA wire at the second supporting portion, and fixing the two fixed ends of the second SMA wire at the second power source fixing portion and the second ground wire fixing portion, respectively, at each of two adjacent side surfaces of the outer frame, which are located at the another corner region.

In one embodiment, a first line segment of the first SMA wire between the first support part and the first power source fixing part and a second line segment of the first SMA wire between the first support part and the first ground wire fixing part are arranged to be parallel to each other, and a third line segment of the second SMA wire between the second support part and the second power source fixing part and a fourth line segment between the second support part and the second ground wire fixing part are arranged to be parallel to each other.

In one embodiment, the SMA wires are arranged symmetrically on adjacent sides of the outer frame.

In one embodiment, the first and second SMA wires are arranged symmetrically to each other and have the same length on each side of the outer frame.

In one embodiment, the movable ends of the first and second SMA wires are disposed at different distances from each side of the outer frame.

In one embodiment, on each side of the outer frame, the fixed ends of the first and second SMA wires are disposed at different distances from each side.

In one embodiment, the movable ends of the first and second SMA wires are wound or fixed on the first and second supports.

In one embodiment, at least a first SMA wire of the first and second SMA wires comprises two lengths of SMA sub-wire, and mounting the first SMA wire around the outer frame comprises: and respectively fixing two ends of each SMA sub-line segment in the two SMA sub-line segments to a first supporting part and a first fixing part, wherein the connecting part of the first supporting part and each sub-line segment is of a conductive structure, so that the two SMA sub-line segments are electrically connected at the first supporting part.

In one embodiment, the first fixing portion includes a first power supply fixing portion and a first ground wire fixing portion, wherein mounting the first SMA wire around the outer frame includes: and two ends of a second SMA sub-line segment in the two SMA sub-line segments are respectively fixed on the first supporting part and the first ground wire fixing part.

In one embodiment, the method further comprises: and the SMA wire fixed on the first fixing part is led out from the first fixing part to be connected with the circuit board, wherein the SMA wire led out from the first fixing part is in a relaxed state.

According to the method provided by the application, automatic focusing and optical anti-shake can be conveniently realized.

Drawings

Exemplary embodiments are illustrated in referenced figures of the drawings. The embodiments and figures disclosed herein are to be regarded as illustrative rather than restrictive.

FIG. 1A shows a perspective view of an optical assembly according to an exemplary embodiment of the present application when SMA wire is provided;

FIG. 1B shows a perspective view of an optical assembly according to another exemplary embodiment of the present application when SMA wire is provided;

FIG. 2 is an enlarged partial view of the fixture in the embodiment shown in FIG. 1A;

FIG. 3A shows a schematic view of the winding portion in the embodiment shown in FIG. 1A;

FIG. 3B shows a schematic view of the winding portion in the embodiment shown in FIG. 1B;

FIG. 4A shows a schematic diagram of a winding shape according to an exemplary embodiment of the present application;

FIG. 4B shows a schematic diagram of a winding shape according to another exemplary embodiment of the present application;

FIG. 5 shows a top view of an optical assembly according to an exemplary embodiment of the present application when SMA wire is provided;

FIG. 6A shows a perspective view of an optical assembly according to yet another exemplary embodiment of the present application when SMA wire is provided;

FIG. 6B shows an enlarged partial view of the active end fixture of the embodiment shown in FIG. 6A;

FIG. 6C is a schematic view showing the internal structure of the movable end fixing member in the embodiment shown in FIG. 6A;

FIG. 7 shows a perspective view of an optical assembly according to yet another exemplary embodiment of the present application when SMA wire is provided;

FIG. 8 shows a perspective view of an optical assembly according to yet another exemplary embodiment of the present application, when SMA wire is provided;

FIG. 9A shows a perspective view of an optical assembly according to yet another exemplary embodiment of the present application when SMA wire is provided;

FIG. 9B shows a side view at one side according to the embodiment shown in FIG. 9A;

figure 10 schematically shows a perspective view of an optical assembly according to an embodiment of the present application, wound with SMA wire.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that the expressions first, second, etc. in this specification are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, a first body discussed below may also be referred to as a second body without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of an object have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "including," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

As used herein, the terms "substantially," "about," and the like are used as terms of table approximation and not as terms of table degree, and are intended to account for inherent deviations in measured or calculated values that will be recognized by those of ordinary skill in the art.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Fig. 1A shows a perspective view of an optical assembly according to an exemplary embodiment of the present application when SMA wire is provided.

As shown in fig. 1A, an optical assembly according to an exemplary embodiment of the present application includes a lens module 10, a base 20, and a fixture 30. The SMA wire 40 is also mounted to the optical assembly before the optical assembly is assembled to the smart device.

The lens module 10 includes a lens 11 and a rectangular outer frame 12 surrounding the lens 11. The rectangular outer frame 12 has four sides. In the perspective view shown in fig. 1A, the structural arrangement of the two sides of the outer frame 12 can be seen. It should be understood that a similar arrangement is provided on the other two sides of the outer frame 12, which are not shown in fig. 1A.

The outer frame 12 includes two winding portions, i.e., a first winding portion 13 and a second winding portion 14, on each side, and the first winding portion 13 and the second winding portion 14 of each side are located at a set of diagonal regions 12A of the outer frame 12. The first and second

wire winding parts

13 and 14 may be integrally formed on the outer frame 12 of the lens module 10.

The mount 20 is disposed under the lens module 10 to support the lens module 10. The lens module 10 is disposed substantially centrally on the base 20. When driven, the lens module 10 is movable along the optical axis of the lens 11 supported by the mount 20, and on a plane perpendicular to the optical axis. Hereinafter, the driving thereof and the movement under the driving will be described in detail in conjunction with the structure of the optical assembly of the present application.

The fixing device 30 is disposed at another pair of diagonal regions 12B of the outer frame 12 of the lens module 10. The fixing device 30 is fixed on the base 20. As shown in the drawing, the fixing device 30 has fixing faces corresponding to each side face of the outer frame 12, respectively, that is, the fixing device 30 has four fixing faces corresponding to four side faces of the outer frame 12, respectively. There are two fixation surfaces at each diagonal zone 12B. Although the two fixing surfaces at each diagonal region 12B are shown to be formed integrally in an L-shape in the drawing, alternatively, the two fixing surfaces at each diagonal region 12B may be completely separated or partially separated.

The fixing means 30 includes a first power source fixing end 31, a ground wire fixing end 32, and a second power source fixing end 33 on fixing surfaces corresponding to each side surface of the outer frame 12, respectively. The first power fixing portion 311 corresponding to the first winding portion 13 is provided at the first power fixing end 31, and the second power fixing portion 331 corresponding to the second winding portion 14 is provided at the second power fixing end 33. A first ground fixing portion 321 corresponding to the first winding portion 13 and a second ground fixing portion 322 corresponding to the second winding portion 14 are provided on the ground fixing end 32. The fixing device 30 including the first power fixing end 31, the ground fixing end 22, and the second power fixing end 33 is fixed to the base 20, and each of the first power fixing end 31, the ground fixing end 22, and the second power fixing end 33 has an electrical connection with the base 20. The first power fixing end 31, the ground fixing end 32 and the second power fixing end 33 are spaced apart from each other to form electrical isolation therebetween, and the first power fixing end 31 and the second power fixing end 33 are separately supplied with power. The power source fixing part and the ground fixing part may be fixing points on the power source fixing end and the ground fixing end or fixing elements at the fixing points.

It should be understood that although it is illustrated in fig. 1A that the first ground fixing portion 321 corresponding to the first winding portion 13 and the second ground fixing portion 322 corresponding to the second winding portion 14 are both provided on the same ground fixing end 32, they may be respectively provided on different ground fixing ends.

Fig. 2 is a partially enlarged view of the fixing device 30 in the embodiment shown in fig. 1A, which corresponds to one fixing surface of the fixing device 30. As can be seen from fig. 2, the ground wire fixing end 32 is located between the first and second power fixing ends 31 and 33, so that the first and second ground

wire fixing parts

321 and 322 corresponding to the first and second winding

parts

13 and 14 can be commonly provided on the same ground wire fixing end 32. The first power fixing end 31, the ground fixing end 32, and the second power fixing end 33 are spaced apart from each other by a certain distance to ensure electrical isolation therebetween. As described above, the fixing device 30 may also include two ground fixing ends on which the first ground fixing portion 321 corresponding to the first winding portion 13 and the second ground fixing portion 322 corresponding to the second winding portion 14 are respectively disposed. It will be appreciated that the power and ground securing ends may be arranged and provided in other ways than those shown.

Fig. 1A and 2 also show SMA wires 40 disposed on the outside of the lens module 10 and the fixing device 30. In the illustrated embodiment, each SMA wire 40 has two fixed ends and one movable end. Two fixed ends (located at two end portions) of each SMA wire 40 are fixed to a set of power supply fixing portion and ground wire fixing portion, respectively, and one movable end (located at an intermediate portion) is wound around a winding portion corresponding to the set of power supply fixing portion and ground wire fixing portion.

The first winding portion 13, the first power source fixing portion 311, and the first ground wire fixing portion 321 are disposed such that: two line segments, which are formed after the SMA wire 40 with two ends respectively fixed to the first power source fixing portion 311 and the first ground wire fixing portion 321 and a movable end wound around the first winding portion 13 is wound, are substantially parallel. The first winding portion 13 has positions to be brought into contact with the two substantially parallel SMA wire segments, which are referred to as a first winding position and a second winding position, respectively. That is, a first connection line between the first winding position on the first winding part 13 and the fixed position on the first power fixing part 311 and a second connection line between the second winding position on the first winding part 13 and the fixed position on the first ground fixing part 321 are parallel to each other. The second winding portion 14, the second power fixing portion 331 and the second ground fixing portion 322 are provided such that: two line segments, two ends of which are respectively fixed on the second power source fixing part 331 and the second ground fixing part 322, and two line segments, formed after the SMA wire 40 with the movable end wound on the second winding part 14 is wound, are approximately parallel; that is, a third connection line between the third winding position on the second winding part 14 and the fixing position on the second power fixing part 331 and a second connection line between the fourth winding position on the second winding part 14 and the fixing position on the second ground fixing part 322 are parallel to each other. The winding portions and the fixing portions are also arranged such that the first and second wires parallel to each other cross the third and fourth wires parallel to each other without contacting each other, so that the two SMA wires fixed and wound on the two sets of winding portions and the fixing portions are formed to cross but not contact each other.

For example, on each side surface of the outer frame 12, the first and second winding wire positions of the first winding portion 13 are the same or approximately the same distance from the corresponding side surface of the outer frame 12. The third and fourth winding wire positions of the second winding portion 14 are also at the same or approximately the same distance from the corresponding side of the outer frame 12. The first and second winding wire positions of the first winding portion 13 are spaced apart from the corresponding side surfaces of the outer frame 12 by different distances from the third and fourth winding wire positions of the second winding portion 14.

For another example, on each fixing surface of the fixing device 30, the fixing position on the first power fixing portion 311 and the fixing position on the first ground fixing portion 321 are spaced apart from the fixing surface by the same or approximately the same distance. The fixing position of the second power fixing part 331 and the fixing position of the second ground fixing part 322 are spaced apart from the fixing surface by the same or approximately the same distance. A distance between the fixing position of the first power fixing portion 311 and the fixing position of the first ground fixing portion 321 and the fixing surface is different from a distance between the fixing position of the second power fixing portion 331 and the fixing position of the second ground fixing portion 322 and the fixing surface.

The two SMA wires fixed and wound on the two groups of winding parts and fixing parts are crossed but not contacted with each other by setting the winding positions and/or the fixing positions to be separated from the side surfaces or the fixing surfaces by different distances. In the case where two SMA wires fixed and wound at the two sets of winding portions and fixing portions are formed to intersect without contacting each other, the lens 11 can be moved along the optical axis and on a plane perpendicular to the optical axis in the case where different SMA wires are electrically driven.

In the embodiment shown in fig. 1A, the first and second winding

portions

13 and 14 are disposed perpendicular to the optical axis of the lens 11 and have a winding structure parallel to the optical axis. Alternatively, the winding portion itself may not be perpendicular to the optical axis, but the plane formed by the first and second wires after winding is parallel to the optical axis, that is, the centers of the first and second winding

structures

131 and 141 described later are perpendicular to the optical axis.

It should be understood that although the outer frame 12 shown in the drawings is rectangular, the outer frame may be any other suitable shape than rectangular, as long as the positions and structures of the wire winding portion and the fixing portion are set such that the SMA wire can be formed to be wound in a quadrilateral shape (preferably, rectangular) whose four sides respectively correspond to the sides of the outer frame in the four directions, and thereby can move the lens module in a manner described below. For example, the outer frame may have an arc shape, the outer surface of the arc shape is provided with the bobbin, and the bobbin can form a quadrangle, preferably a rectangle, with the power source fixing end and the ground wire fixing end provided to the fixing device; for another example, the fixing device may be an arc shape, and the power fixing end and the ground fixing end are disposed on an outer surface of the arc, and the shape and size of the power fixing end and the ground fixing end are changed accordingly, so that a rectangular-like quadrangle shape can be formed together with the bobbin.

In fact, the outer frame of the lens module may have four sides divided by an angular range, and the winding portion and the corresponding fixing portion on each side may be provided to be able to form the above-described quadrangle. The four sides divided by the angular range should be understood as dividing four quadrants, each quadrant having an angular range corresponding to one side, by taking the central position of the outer frame as a central point (center of a circle). For example, for an outer frame of a rectangle, the four sides thus divided correspond to the four sides of the rectangle; for a circular outer frame, the four sides thus divided correspond to four quarter arcs. That is, the outer frame of the lens module may have any shape as long as the winding portions provided on each side divided by an angle and the corresponding fixing portions of the fixing devices cooperate to form a desired quadrangular structure.

It should also be understood that the mounts in the above embodiments are not necessary for the optical assemblies of the present application. For example, instead of a base, a support could extend laterally from the bottom of the fixture.

Fig. 3A shows a schematic view of the winding portion in the embodiment shown in fig. 1A. As shown in fig. 3A, the first and second winding

portions

13 and 14 extend perpendicularly from the side surface of the outer frame 12, thereby being perpendicular to the optical axis of the lens 11. On the first winding portion 13 and the second winding portion 14, a first winding structure 131 and a second winding structure 141 are respectively provided in parallel to the optical axis. For example, the first and second winding

structures

131 and 141 are groove structures provided on the first and second winding

portions

13 and 14, respectively, for winding the SMA wire. As shown in the drawings, the first and second winding

structures

131 and 141 are respectively disposed at different distances from the side of the outer frame 12, whereby the two SMA wires 40 fixed and wound as described above are crossed without contact when the fixing portions on the fixing device 30 are disposed at the same distance from the fixing surface. The first and second winding

portions

13 and 14 shown in fig. 3A have substantially the same length, and the first and second winding

structures

131 and 141 are formed at different positions from the heads or distal ends of the first and second winding

portions

13 and 14, respectively. It should be understood that the structure of the winding portions is not limited thereto, and for example, the first and second winding

portions

13 and 14 having different lengths may be used, and the first and second winding

structures

131 and 141 are respectively formed at the same positions from the head or distal end portions of the first and second winding portions as long as the first and second winding structures are respectively formed at different distances from the side of the outer frame 12. In various embodiments, the first winding structure 131 and the second winding structure 141 may be formed at the same distance from the side of the outer frame 12, and the corresponding fixing portions of the fixing device may be formed at different distances from the corresponding fixing surfaces.

Fig. 1B shows a perspective view of an optical assembly according to another exemplary embodiment of the present application when SMA wire is provided. The main difference between the embodiment shown in fig. 1B and the embodiment shown in fig. 1A is the structure of the winding portion. The first winding portion 15 and the second winding portion 16 in fig. 1B have a structure similar to an L shape, a main body having the winding structure is disposed parallel to an optical axis of the lens 11, and the winding

structures

151 and 161 perpendicular to the optical axis are provided.

In the above-described embodiment, in order to facilitate the mounting of the SMA wires, the heights of the power-fixing ends and the corresponding ground-fixing ends may be set to be different from each other, that is, the fixed positions on the first power-fixing portion and the first ground-fixing portion are different from the corresponding side surface of the outer frame, and the fixed positions on the second power-fixing portion and the second ground-fixing portion are different from the corresponding side surface of the outer frame. In this case, the overall heights of the power source fixing end and the ground wire fixing end may be different, or the fixing positions of the power source fixing end and the ground wire fixing end may be set at different heights.

It should be understood that the shape and configuration of the winding portion itself may not be perpendicular or parallel to the optical axis, as long as the winding structure thereon is parallel or perpendicular to the optical axis as described in the above embodiments. Furthermore, the winding structure can be arranged to form an included angle with the optical axis according to actual needs, and the SMA has higher consistency during contraction through the included angle.

Fig. 3B shows a schematic view of the winding portion in the embodiment shown in fig. 1B. As shown in fig. 3B, the main bodies of the first and second winding

portions

15 and 16 are parallel to the optical axis of the lens 11, and the first and second winding

portions

15 and 16 have a connection structure extending from the main bodies thereof to the side surface of the outer frame 12. Alternatively, the first and second winding

wire portions

15 and 16 parallel to the optical axis may be connected to the side of the outer frame 12 by an additional connector. On the side surfaces of the outer frame 12, a first winding structure 151 and a second winding structure 161 perpendicular to the optical axis are respectively provided. As shown in the drawings, the first and second winding

structures

151 and 161 are respectively disposed at different distances from the side of the outer frame 12, whereby the two SMA wires 40 fixed and wound as described above are crossed without contact when the fixing portions on the fixing device 30 are disposed at the same distance from the fixing surface. In various embodiments, the first and second winding structures may also be formed at the same distance from the side of the outer frame 12, with the corresponding fixing portions on the fixing device being formed at different distances from the corresponding fixing surfaces.

Fig. 3A and 3B show the winding structure in an i-shape, i.e., a structure having two wider ends and a certain concave distance in the middle with respect to the two ends. The recess distance constitutes a recess for accommodating the SMA wire and limiting undesired movements of the SMA wire during actuation. Optionally, a T-shaped winding structure can be adopted to prevent the SMA wire from falling off during driving. Furthermore, a structure similar to a mushroom head can be added to the winding structure to limit the position of the SMA wire and prevent the SMA wire from falling off from the winder, and the structure can also be similar to screwing a screw into a screw hole or inserting a positioning pin into a positioning hole. Screwing into the last screw hole and the screw will have an annular gap between them, which is used to mount the SMA wire. The head of the screw is relatively large, so that the limiting effect on the SMA wire is enhanced.

Fig. 4A and 4B illustrate two winding wire shapes according to exemplary embodiments of the present application. Specifically, fig. 4A shows a schematic diagram of the SMA wire 40 wound in a U-shaped configuration, and fig. 4B shows a schematic diagram of the SMA wire wound in an O/α -shaped configuration.

In the illustrated embodiment, each SMA wire is formed into a U-shaped or O/α -shaped double-layer wire structure after being wound, and the double-layer wire structure has better structural strength, higher stability, smaller attitude difference, higher focusing accuracy and the like compared with an existing single-layer wire structure. The structural strength of the SMA wire is enhanced through the double-layer wire structure, and the SMA wire can also bear a heavier lens, such as a glass lens, or the lens with more lenses compared with the existing lens, so that the quality of the whole module is further improved.

Figure 5 shows a top view of an optical assembly according to an exemplary embodiment of the present application when SMA wire is provided. Next, the movement of the optical component according to the present application in all directions by the SMA wire will be described with reference to fig. 5.

As shown in fig. 5, an optical assembly according to the present application provides SMA wires on each side. Although not shown in fig. 5, it will be understood from the above description that there are two SMA wires crossing each other but not touching each other on each side, rather than just one SMA wire. The

wire winding portions

13, 14 provided in the diagonal region 12A of the outer frame 12, and the fixing devices 30 provided in the diagonal region 12B are shown in fig. 5. Although fig. 5 shows the winding portions parallel to the optical axis, it should be understood that the winding portions may also be perpendicular to the optical axis. For convenience of description, four sides of the outer frame of the optical assembly are numbered counterclockwise as shown in fig. 5 as a first side 1, a second side 2, a third side 3, and a fourth side 4, respectively. Meanwhile, as shown in fig. 5, a plane perpendicular to the optical axis is represented by a rectangular coordinate system, and x and y axes are shown in fig. 5. Based on the coordinate system shown in fig. 5, a direction perpendicular to the xy plane can be regarded as a z-axis, a direction perpendicular to the plane upward is a z + direction, and a direction perpendicular to the plane downward is a z-direction.

As shown in fig. 5, the four sides are divided into two groups, and the opposite two sides are one group. Specifically, the first side 1 and the third side 3 are a set for controlling the movement of the lens 11 in the x direction. The second side 2 and the fourth side 4 are in one group for controlling the movement of the lens 11 in the y-direction.

As described above, in the camera module of the present application, the fixing device 30 is fixed to the base 20, and therefore, the fixing device 30 and the fixing portion thereof maintain the same position during the movement of the lens 11. When the lens needs to be driven to move towards the x + direction, current is applied to the two SMA wires on the third side surface, and the SMA wires on the third side surface are heated by a preset amount of temperature after being electrified, so that the SMA wires shrink by a preset amount of length. Since both ends of the SMA wire are fixed to the fixing device 30, the positions of both ends of the SMA wire are maintained. When the lengths of the two SMA wires are contracted, a force in the x + direction is applied to the bobbin together around the movable end of the bobbin, and the lens 11 is moved by a predetermined distance in the x + direction. And under the condition that the SMA wire on the third side surface applies a force to the direction x + and drives the lens to move to the direction x +, the SMA wire on the first side surface is stretched along with the movement of the lens module to the direction x +. And after the lens module reaches the expected position and is kept in a stable state, cooling the SMA wire on the third side surface, so that the lens module is stably kept in the expected position and a corresponding focusing or zooming function is realized.

Similarly, when the lens module needs to be driven to move towards the x-direction, current is applied to the SMA wire on the first side surface, so that the SMA wire on the first side surface contracts to drive the lens to move towards the x-direction. At this time, the SMA wire of the third side is stretched as the lens module moves in the x-direction.

When the lens needs to be driven to move towards the y + direction, current is applied to the two SMA wires on the fourth side surface, and the SMA wires on the fourth side surface are heated by a preset amount of temperature after being electrified, so that the SMA wires shrink by a preset amount of length. Since both ends of the SMA wire are fixed to the fixing device 30, the positions of both ends of the SMA wire are maintained. When the lengths of the two SMA wires are contracted, a force in the y + direction is applied to the bobbin together around the movable end of the bobbin, and the lens 11 is moved by a predetermined distance in the y + direction. And under the condition that the SMA wire on the fourth side surface exerts a force towards the y + direction and drives the lens to move towards the y + direction, the SMA wire on the second side surface is stretched along with the movement of the lens module towards the y + direction. And after the lens module reaches the expected position and is kept in a stable state, cooling the SMA wire on the fourth side surface, so that the lens module is stably kept in the expected position and a corresponding focusing or zooming function is realized.

Similarly, when the lens module needs to be driven to move towards the y-direction, current is applied to the SMA wire on the second side surface, so that the SMA wire on the second side surface contracts to drive the lens to move towards the y-direction. At this time, the SMA wire of the fourth side is stretched as the lens module moves in the y-direction.

It should be understood that although not shown in fig. 5, the edge of the lens module supported on the base is spaced from the fixture by an appropriate distance to enable the lens module to move in the x and y directions by an appropriate distance under the drive of the SMA wires, thereby performing an optical anti-shake function.

In order to keep the axial position of the optical axis of the lens module unchanged when the lens module is moved in the x-direction and the y-direction, the two SMA wires of each side surface may be arranged to be substantially symmetrical with respect to the intersection position of the two SMA wires, so that when substantially the same current is applied, the forces applied to the winding parts are also substantially the same, whereby the axial components of the forces applied by the two SMA wires substantially cancel each other.

It is described above that the winding portion and the fixing portion are disposed so that the two SMA wires of each side face intersect without contacting. That is, one of the two SMA wires of each side surface is provided corresponding to the upper fixing portion and the lower winding portion, and the other is provided corresponding to the lower fixing portion and the upper winding portion, thereby forming the crossing relationship of the two SMA wires.

When the lens needs to be driven to move in the z + direction, current is applied to one of the two SMA wires on each side surface, which is positioned on the upper fixed part. That is, a total of four SMA wires fixed to the upper portion are energized, and the energized SMA wires heat up and thereby contract a predetermined amount of length. When the four SMA wires are contracted in length, a force in the z + direction is applied to the wire winding portion together around the movable end provided in the wire winding portion, and the lens 11 is moved by a predetermined distance in the z + direction. And after the lens module reaches the expected position and is kept in a stable state, cooling the SMA wire on the fourth side surface, so that the lens module is stably kept in the expected position and a corresponding focusing or zooming function is realized.

Similarly, when the lens module needs to be driven to move towards the z-direction, current is applied to one SMA wire below the fixed part of the two SMA wires on each side surface, so that the energized SMA wires contract to drive the lens to move towards the z-direction together. Therefore, the automatic focusing function of the lens can be realized.

In order to keep the position of the lens module in the x-direction and the y-direction unchanged when the lens module moves in the z-direction, the SMA wires of the adjacent side surfaces may be arranged to be substantially symmetrical with respect to the boundary line of the adjacent side surfaces, so that the components of the force applied to the winding part in the x-direction and the y-direction are substantially cancelled out when substantially the same current is applied.

Fig. 6A shows a perspective view of a camera module according to yet another exemplary embodiment of the present application, when SMA wire is provided. The difference from the embodiment shown in fig. 1A is that a movable end fixing portion is provided on the outer frame 12 of the lens module 10 instead of the wire winding portion. As shown in fig. 6A, on the outer frame of the lens module 10, a first movable end fixing portion 17 and a second movable end fixing portion 18 are provided to hold and fix the U-shaped structure of the SMA wire, thereby preventing the SMA wire from rubbing the bobbin when the lens is moved.

FIG. 6B shows an enlarged partial view of the active end fixture of the embodiment shown in FIG. 6A; fig. 6C is a schematic view showing an internal structure of the movable end fixing member in the embodiment shown in fig. 6A.

In the case of using the movable end fixing portion instead of the winding portion, each of two parallel SMA wire segments formed in a wire winding structure equivalent to a U shape is fixed to the movable end fixing portion at least one point in the vicinity of the winding structure. In this case, the first and second winding positions of the winding part described above may be the first and second fixing positions of the movable end fixing part.

At this time, since the deformation of the SMA wire fixed inside by the movable end fixing portion does not have a direct or positive effect on the movement of the lens, the SMA wire may alternatively be a separate structure at the U-shaped structure, that is, a portion of the SMA wire fixed inside by the movable end fixing portion may be removed. In fact, such a structure corresponds to the case where one SMA wire in the embodiment of fig. 1A to 4 is provided as two SMA wires, each of which has one end connected to the movable end fixing portion and the other ends connected to the power supply fixing portion and the ground fixing portion corresponding to the movable end fixing portion, respectively.

In this case, the two SMA wires connected between the two ends of the movable end fixing portion may be electrically connected by a common conductive element, and since the resistance of the common conductive element is smaller than that of the SMA wire, the voltage divided by the SMA wire fixed to the movable end fixing element can be reduced by electrically connecting the common conductive element, thereby reducing power loss and improving power utilization.

In this embodiment, the first SMA wire and the second SMA wire are both two wires, and both ends of the first SMA wire are fixed to the movable end and the fixed end, respectively, as is the second SMA wire.

In one embodiment, two SMA wires may be installed simultaneously, with a slightly greater length reserved. The movable end fixing part can intercept the required line length according to actual requirements. The position of the movable end fixing part, which is contacted with the SMA wire, can be a conductive metal structure, so that the wire clamped in the movable end fixing part can be directly short-circuited, and current directly flows from the movable end fixing part, thereby realizing the electric connection between the two SMA wires, forming a loop and enabling the SMA wire to work normally.

In the solution shown in fig. 6A, in which the U-shaped structure is fixed by the movable end fixing portion, two SMA wires fixed to the same movable end fixing portion may be separated from each other by a distance of only about one wire diameter, so that the two SMA wires can better move synchronously. Alternatively, two SMA wires fixed to the same movable end fixing portion may be spaced apart from each other by a larger distance so as not to contact each other, thereby avoiding friction therebetween.

As shown in fig. 6A, the two movable end fixing portions of the same side have different sizes such that the movable end fixing position of one movable end fixing portion is spaced apart from the side and the movable end fixing position of the other movable end fixing portion is spaced apart from the side.

Fig. 7 shows a perspective view of a camera module according to yet another exemplary embodiment of the present application when SMA wire is provided. Similar to the embodiment shown in fig. 6A, the movable end fixing portion is also employed instead of the winding portion in the embodiment of fig. 7. Unlike the embodiment of fig. 6A, a similar securing feature is also employed on the securing device 30 in the embodiment of fig. 7. As shown in fig. 7, the fixing device 30 no longer includes a power fixing end and a ground fixing end electrically isolated from each other, but a first fixing member 34 and a second fixing member 35 are provided on the fixing device. The first power source fixing portion 311 and the first ground wire fixing portion 312 are fixed in the first fixing member 34 to be electrically insulated from each other. The second power source fixing portion 331 and the second ground fixing portion 322 are fixed in the second fixing member 35 to be electrically insulated from each other. That is, two ends of each SMA wire fixed at the movable end fixing part at the movable end are fixed by the same insulating fixing part, the distance between the two ends of the SMA wire fixed by the fixing part can be equal to or larger than the diameter of the SMA wire, and the two ends of the SMA wire are respectively led out outwards and are electrically connected with the circuit board, so as to replace the mode of directly electrically connecting with the circuit board through the fixing end. The SMA wire and the fixing device can be adhered by glue to be fixed on the fixing device, or the conductive element is arranged in the fixing device, so that the electric connection between the SMA wire and the circuit board can be realized by the conductive element, or the electric connection between the SMA wire and the circuit board can be realized by other modes.

In the embodiment shown in fig. 7, the two crossed SMA wires have equal or approximately equal lengths to avoid mutual rubbing of the SMA wires when the lens is moved. When the fixing end is directly electrically connected with the circuit board through the SMA wire, the downward extending route of the SMA wire above the fixing end is not limited to the case shown in the figure.

Alternatively, the two intersecting SMA wires may have different lengths. The two SMA wires that cross may also have different lengths, as shown in fig. 8. In this case, the SMA wires led out through the fixing member on the fixing device may be directly extended downward and electrically connected to the circuit board.

In the embodiment shown in fig. 7 and 8, the SMA wire led out through the fixing member on the fixing device is connected to the circuit board, and because the SMA wire has a characteristic of thermal contraction, a certain length needs to be reserved when the SMA wire is installed to prevent the SMA wire from being broken. Alternatively, the SMA wires may terminate in a fixture and the electrical connection is made by conventional wire or insert molding.

FIG. 9A illustrates a perspective view of a camera module according to yet another exemplary embodiment of the present application when SMA wire is provided; and figure 9B shows a side view at one side according to the embodiment shown in figure 9A.

The embodiment shown in fig. 9A and 9B differs from the embodiment shown in fig. 1A in that the first and second winding portions are formed by two parts on the same shaft member 19 parallel to the optical axis, and the shaft members forming the first and second winding portions are provided in supports 191 extending outwardly from the corresponding sides of the outer frame. When the first and second wire winding portions are formed in this manner, the shaft member 19 and the support 191 may be formed integrally with the lens of the camera module and the outer frame 12 through an injection molding process, thereby simplifying the manufacturing process.

It should be understood that the winding portion and the movable end fixing portion in the above embodiments may be implemented as other supporting components as long as the supporting function can be provided for the movable end of the SMA wire and the lens module is moved along with the contraction of the SMA wire under the condition that the SMA wire exerts a force due to the contraction.

In the case of using a support portion that has a supporting effect on the movable end of the SMA and is movable by the SMA when the SMA wire contracts, the support position corresponds to the winding position in the above-described embodiment. Therefore, in some embodiments, a first connection line between a first support position on the first support part and a fixed position on the first power source fixing part and a second connection line between a second support position on the first support part and a fixed position on the first ground fixing part are parallel to each other, a third connection line between a third support position on the second support part and a fixed position on the second power source fixing part and a fourth connection line between a fourth support position on the second support part and a fixed position on the second ground fixing part are parallel to each other, and the first and second connection lines parallel to each other cross the third and fourth connection lines parallel to each other without contacting each other. In some embodiments, on each side of the outer frame, the first and second support locations are spaced apart from the corresponding side of the outer frame by a distance different from the distance the third and fourth support locations are spaced apart from the corresponding side of the outer frame.

Figure 10 schematically shows a perspective view of an optical assembly according to an embodiment of the present application, wound with SMA wire. In particular, fig. 10 shows that two SMA wires 40 are provided on each of the four sides of the outer frame 12, each having a fixed end fixed to the fixing device 30 and a movable end supported on the

support portions

13, 14.

The present application also provides camera module embodiments having SMA wires according to the structures described above and shown in the accompanying drawings.

According to one embodiment, the camera module may include: the lens module comprises a lens module with an outer frame, a base arranged below the lens module and used for supporting the lens module, and SMA wires arranged around the outer frame of the lens module in a quadrilateral shape, wherein four sides of the quadrilateral shape respectively correspond to the sides of the outer frame in four directions, and the SMA wires comprise a first SMA wire and a second SMA wire on each side of the outer frame, wherein the first SMA wire and the second SMA wire are arranged to be crossed but not contacted with each other. In this embodiment, the structure and position of the fixing device and the support portion (including the wire winding portion and the movable end fixing portion) in the above embodiments may not be particularly limited, as long as the SMA disposed on the side of the outer frame of the lens module is disposed around the outer frame of the lens module in a quadrilateral shape, and the two SMA wires on each side of the quadrilateral shape can cross each other without contacting each other, so as to be able to drive the lens to move in a desired direction under different driving.

In one embodiment, the quadrilateral is a rectangle.

In one embodiment, the first and second SMA wires each have a fixed end disposed at a position corresponding to one end of each side of the outer frame and a movable end supported at the other end of each side of the outer frame, the fixed end being fixed relative to the base and the movable end being fixed relative to the outer frame, the movable end moving the lens module relative to the base when the SMA wires are deformed. The specific situations of how the SMA wires on the outer frame side of the lens module respectively contract and move under different driving modes to achieve optical anti-shake and auto-focusing have been described in detail above, and thus a description thereof will not be repeated. All technical features of the various embodiments described above in connection with the figures are applicable without conflict to the camera module embodiments with SMA wires.

For example, in one embodiment, at least one of the first and second SMA wires is folded so as to have two fixed ends and one movable end, the two fixed ends of the at least one of the first and second SMA wires being disposed in a fixed and adjacent position relative to the base. Thus, the SMA wires at both ends of the fold are formed substantially parallel to each other.

In one embodiment, the movable end of at least one of the first and second SMA wires is supported on an outer frame of the lens module. As described above, the movable end may be supported on the outer frame of the lens module by being wound or fixed, and the supporting manner of the movable end on the outer frame is not limited to being wound and fixed.

In one embodiment, at least one of the first and second SMA wires is folded into two SMA wire segments, the two SMA wire segments being parallel to each other and having the same length. In various embodiments, the two SMA wire segments may also have different lengths.

In one embodiment, the SMA wires on adjacent sides of the outer frame are symmetrically arranged so that the force components in the x-and y-directions applied by the two to the support or bearing on the outer frame substantially cancel out when substantially the same current is applied for optical anti-shake. In one embodiment, the first and second SMA wires are arranged symmetrically to each other and of the same length on each side of the outer frame, so that in the event of substantially the same current being applied during focusing, the forces applied to the bearings or supports on the outer frame are also substantially the same, whereby the axial components of the forces applied by the two substantially cancel. In one embodiment, the first and second SMA wires are arranged to have at least a portion that is symmetrical to each other on each side of the outer frame.

In one embodiment, the movable ends of the first and second SMA wires are at different distances from each side of the outer frame. In one embodiment, the fixed ends of the first and second SMA wires are at different distances from each side of the outer frame. Thus, it is ensured that the two SMA wires on each side do not rub against each other during movement due to contraction, thereby adversely affecting the position of the lens module.

In one embodiment, the lens module has first and second supports on each side of the outer frame, the first and second supports supporting the first and second SMA wires, respectively.

In one embodiment, at least the first support of the first and second supports is a wound portion on which the first SMA wire is wound.

In one embodiment, the wire winding portion is disposed perpendicular to an optical axis of the lens module and has a wire winding structure parallel to the optical axis such that the first SMA wire is wound on the wire winding structure parallel to the optical axis. In one embodiment, the wire winding portion is disposed parallel to an optical axis of the lens module and has a wire winding structure perpendicular to the optical axis such that the first SMA wire is wound on the wire winding structure perpendicular to the optical axis. In one embodiment, the winding portion has a T-shaped or i-shaped winding structure, and the first SMA wire is wound around the T-shaped or i-shaped winding structure of the winding portion.

In one embodiment, at least the first support part of the first and second support parts is a movable end fixing part to which the first SMA wire is fixed. In one embodiment, the first SMA wire comprises two separate lengths of SMA wire, and the movable end fixing portion further comprises an electrically conductive element disposed between the two separate lengths of SMA wire. Because the resistivity of the common conductive element is larger than that of the SMA, the SMA wire can be divided into more voltages, and the electric energy utilization rate is improved. In various embodiments, the first SMA wire may also comprise a single piece of SMA wire, rather than two separate pieces of SMA wire; in this case, no additional conductive element is required in the movable end fixing portion.

It is to be understood that the technical features described in any of the above embodiments may also be used in other embodiments, in whole or in part, without conflict. For example, in the embodiment shown in fig. 1A, one of the winding portions may be replaced with a movable end fixing portion, while the other winding portion may hold a winding portion using the winding portion shown in fig. 1A or another structure.

Further, based on the above-described embodiments of the optical module and the winding structure, the present application also proposes a method of winding a shape memory alloy SMA wire on an optical module, wherein the optical module includes a lens module having an outer frame and a fixing device disposed at a set of diagonal regions of the lens module, the method including: the SMA wires are mounted around the outer frame to form four sides (e.g., the four sides are rectangular) that are opposite in pairs, wherein the SMA wires disposed on each side include a first SMA wire and a second SMA wire, and the first SMA wire and the second SMA wire are disposed to cross each other without contacting, wherein the SMA wires are in a taut state during mounting, whereby the position of the lens module can be well maintained.

In one embodiment, the outer frame comprises a first support and a second support in a further pair of diagonal regions corresponding to each side; the fixing device all has on the stationary plane that corresponds with every side respectively and surrounds outer frame installation SMA line with first supporting part and the first fixed part and the second fixed part that correspond respectively with the second supporting part and include: when the lens module approaches one of the other pair of corner regions (e.g., the upper right corner of fig. 5), supporting the movable end of the first SMA wire at the first supporting portion, fixing the two fixed ends of the first SMA wire at the first fixing portion, and supporting the movable end of the second SMA wire at the second supporting portion, fixing the two fixed ends of the second SMA wire at the second fixing portion, at each of two adjacent sides of the outer frame at the one corner region; and when the lens module approaches another corner region of the another pair of corner regions (e.g., the lower left corner of fig. 5), supporting the movable end of the first SMA wire at the first supporting portion, fixing the two fixed ends of the first SMA wire at the first fixing portion, and supporting the movable end of the second SMA wire at the second supporting portion, and fixing the two fixed ends of the second SMA wire at the second fixing portion, at each of two adjacent sides of the outer frame at the another corner region.

In an embodiment, the first fixing portion may include a first power fixing portion and a first ground fixing portion, and the second fixing portion may include a second power fixing portion and a second ground fixing portion. At this time, installing the SMA wire around the outer frame includes: when the lens module is close to one corner region in the other pair of corner regions, supporting a movable end of a first SMA wire at a first supporting part, fixing two fixed ends of the first SMA wire at a first power source fixing part and a first ground wire fixing part respectively, supporting a movable end of a second SMA wire at a second supporting part, and fixing two fixed ends of the second SMA wire at a second power source fixing part and a second ground wire fixing part respectively, on each of two adjacent side surfaces of the outer frame, which are located in one corner region; and when the lens module is close to the other corner region in the other pair of corner regions, supporting the movable end of the first SMA wire at the first supporting part, fixing the two fixed ends of the first SMA wire at the first power source fixing part and the first ground wire fixing part respectively, and supporting the movable end of the second SMA wire at the second supporting part, and fixing the two fixed ends of the second SMA wire at the second power source fixing part and the second ground wire fixing part respectively, at each of the two adjacent side surfaces of the outer frame, which are located at the other corner region.

For example, referring to fig. 5, although a gap between the lens module and the fixing device is not shown, it is understood that there is a suitable gap between the outer edge of the lens module and the region defined by the fixing device. It is with this gap that the displacement required for the optical anti-shake described above is achieved. According to the winding method of the present application, the lens module is first placed against or near the fixtures corresponding to the first and

second sides

1 and 2, i.e., near the upper right corner area shown in fig. 5. The movable ends of the first SMA wires on the first side surface 1 and the second side surface 2 are wound on the first winding portions, and the movable ends of the second SMA wires on the first side surface 1 and the second side surface 2 are wound on the second winding portions. The step of winding the movable end around the winding part may be performed before or after the step of disposing the lens module against or near the fixing means corresponding to the first and second side surfaces 1 and 2. After the lens module is arranged close to or close to the fixing devices corresponding to the first side surface 1 and the second side surface 2 and the movable ends of the SMA wires of the first side surface 1 and the second side surface 2 are wound on the corresponding wire winding portions, two fixed ends of the first SMA wire on the first side surface 1 and the second side surface 2 are fixed on the first power supply fixing portion and the first ground wire fixing portion of the corresponding side surface, and two fixed ends of the second SMA wire are respectively fixed on the second power supply fixing portion and the second ground wire fixing portion of the corresponding side surface.

Then, after the SMA wires have been arranged on the first and

second sides

1 and 2 as above, the lens module is arranged against or close to the fixing means corresponding to the third and

fourth sides

3 and 4, i.e. close to the lower left corner area shown in fig. 5. The movable ends of the first SMA wires on the third side 3 and the fourth side 4 are wound on the first winding portions, and the movable ends of the second SMA wires on the first side 1 and the second side 2 are wound on the second winding portions. Also, the step of winding the movable end around the winding portion may be performed before or after the step of disposing the lens module against or near the fixing means corresponding to the third and

fourth sides

3 and 4. After the lens module is disposed close to or near the fixing devices corresponding to the third and

fourth sides

3 and 4 and the movable ends of the SMA wires of the third and

fourth sides

3 and 4 are wound around the corresponding winding portions, the two fixed ends of the first SMA wire on the third and

fourth sides

3 and 4 are fixed to the first power source fixing portion and the first ground wire fixing portion of the corresponding side, and the two fixed ends of the second SMA wire are fixed to the second power source fixing portion and the second ground wire fixing portion of the corresponding side, respectively. Thereby, the wound arrangement of the SMA wire is completed.

By the above method, there are two SMA wires on each side of the outer frame of the lens module, each SMA wire being an arrangement of two layers of wires. Therefore, the SMA wire which contracts under driving to drive the lens to move has higher strength compared with the prior art.

Further, since the distance that the lens moves on a plane perpendicular to the optical axis for optical anti-shake is very small, typically on the order of micrometers, the distance between the outer frame of the lens module and the range where the fixing device is formed is extremely small. Compared with the SMA wire arranged in the prior art which is often loose, the SMA wire arranged according to the method has a relatively tensioning effect.

In one embodiment, the SMA wires are arranged symmetrically on adjacent sides of the outer frame. In one embodiment, the first and second SMA wires are arranged symmetrically to each other and have the same length on each side of the outer frame. In one embodiment, the first and second SMA wires are arranged to have at least a portion that is symmetrical to each other on each side of the outer frame.

In one embodiment, the movable ends of the first and second SMA wires are disposed at different distances from each side of the outer frame. In one embodiment, on each side of the outer frame, the fixed ends of the first and second SMA wires are disposed at different distances from each side.

When the movable end of the first SMA wire is fixed on the corresponding supporting part, the first SMA wire comprises two SMA sub-wire sections. In this case, mounting the first SMA wire around the outer frame includes: and respectively fixing two ends of each SMA sub-line segment in the two SMA sub-line segments to a first supporting part and a first fixing part, wherein the connecting part of the first supporting part and each sub-line segment is of a conductive structure, so that the two SMA sub-line segments are electrically connected at the first supporting part. Specifically, two ends of a first SMA sub-wire section of the two SMA sub-wire sections may be fixed to the first supporting portion and the first power source fixing portion, respectively, and two ends of a second SMA sub-wire section of the two SMA sub-wire sections may be fixed to the first supporting portion and the first ground wire fixing portion, respectively.

When the movable end of the first SMA wire is fixed on the corresponding support part, the first SMA wire fixed on the first fixing part can be led out from the first fixing part to be connected with an external circuit board, wherein the SMA wire led out from the first fixing part is in a loose state so as to avoid fracture in later contraction.

The above description is only a preferred embodiment of the present application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the scope of the present application. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. A method of winding SMA wire on an optical assembly, wherein the optical assembly includes a lens module having an outer frame and a fixture disposed at a set of diagonal regions of the lens module, the method comprising:

mounting SMA wires around the outer frame to form four sides opposite in pairs, wherein, on each side, the SMA wires include a first SMA wire and a second SMA wire that are folded so as to each have two fixed ends and one movable end, the two fixed ends of each of the first SMA wire and the second SMA wire are disposed in fixed and adjacent positions with respect to the fixing devices, and the first SMA wire and the second SMA wire are disposed to cross each other without contacting, wherein the SMA wires are in a taut state during mounting.

2. The method of claim 1, wherein the four sides are formed as rectangles.

3. The method of claim 1, wherein,

the outer frame comprises a first supporting part and a second supporting part in another pair of diagonal regions corresponding to each side face;

the fixing device is provided with a first fixing part and a second fixing part respectively corresponding to the first supporting part and the second supporting part on a fixing surface respectively corresponding to each side surface,

installing an SMA wire around the outer frame includes:

when the lens module is close to one corner region of the other pair of corner regions, supporting the movable end of the first SMA wire on the first supporting part, fixing the two fixed ends of the first SMA wire on the first fixing part, supporting the movable end of the second SMA wire on the second supporting part, and fixing the two fixed ends of the second SMA wire on the second fixing part, at each of two adjacent side faces of the outer frame in the one corner region; and

when the lens module is close to when another angle region in another group diagonal region the outer frame be in each of two adjacent sides of another angle region will the expansion end of first SMA wire support in first supporting part will two stiff ends of first SMA wire are fixed first fixed part, and will the expansion end of second SMA wire support in the second supporting part, will two stiff ends of second SMA wire are fixed the second fixed part.

4. The method of claim 3, wherein the first fixing portion includes a first power supply fixing portion and a first ground fixing portion, and the second fixing portion includes a second power supply fixing portion and a second ground fixing portion, wherein mounting the SMA wire around the outer frame includes:

when the lens module is close to one of the other pair of diagonal regions, supporting a movable end of the first SMA wire on the first supporting portion, respectively fixing two fixed ends of the first SMA wire to the first power source fixing portion and the first ground wire fixing portion, and supporting a movable end of the second SMA wire on the second supporting portion, respectively fixing two fixed ends of the second SMA wire to the second power source fixing portion and the second ground wire fixing portion, at each of two adjacent side surfaces of the outer frame, which are located at the one diagonal region; and

work as the lens module is close to when another group is to another angle region in the angle region of another group the outer frame be in every in two adjacent sides of another angle region will the expansion end of first SMA wire support in first supporting part will two stiff ends of first SMA wire are fixed respectively first power fixed part with first ground wire fixed part, and will the expansion end of second SMA wire support in the second supporting part, will two stiff ends of second SMA wire are fixed respectively the second power fixed part with second ground wire fixed part.

5. The method of claim 4, wherein a first line segment of the first SMA wire between the first support part and the first power source fixing part and a second line segment of the first SMA wire between the first support part and the first ground wire fixing part are disposed parallel to each other, and a third line segment of the second SMA wire between the second support part and the second power source fixing part and a fourth line segment between the second support part and the second ground wire fixing part are disposed parallel to each other.

6. The method of claim 1, wherein the SMA wires are arranged symmetrically on adjacent sides of the outer frame.

7. The method of claim 1, wherein the first and second SMA wires are arranged symmetrically to each other and have the same length on each side of the outer frame.

8. The method of claim 3, wherein the active ends of the first and second SMA wires are disposed at different distances from each side of the outer frame.

9. The method of claim 3, wherein fixed ends of the first and second SMA wires are disposed at different distances from each side of the outer frame.

10. A method according to claim 3, wherein the free ends of the first and second SMA wires are wound or fixed on the first and second supports.

11. The method of claim 3, wherein at least the first one of the first and second SMA wires comprises two SMA subline segments, and mounting the first SMA wire around the outer frame comprises:

and respectively fixing two ends of each SMA sub-line segment of the two SMA sub-line segments to the first supporting part and the first fixing part, wherein the connecting part of the first supporting part and each sub-line segment is of a conductive structure, so that the two SMA sub-line segments are electrically connected at the first supporting part.

12. The method of claim 11, wherein the first fixing portion comprises a first power supply fixing portion and a first ground fixing portion, and wherein mounting the first SMA wire around the outer frame comprises:

and fixing two ends of a first SMA sub-line segment of the two SMA sub-line segments to the first supporting part and the first power supply fixing part respectively, and fixing two ends of a second SMA sub-line segment of the two SMA sub-line segments to the first supporting part and the first ground wire fixing part respectively.

13. The method of claim 3, further comprising:

and the SMA wire fixed on the first fixing part is led out from the first fixing part to be connected with a circuit board, wherein the SMA wire led out from the first fixing part is in a relaxed state.