KR101687207B1 - Wire-terminel assembly for camera - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-terminal assembly for an automatic focusing device for a camera, and more particularly to a wire-terminal assembly for an automatic focusing device for a camera in which the performance of a shape memory alloy wire can be stably maintained even after a pressing process . One embodiment of the present invention is a wire-terminal assembly of an autofocus device for a camera, comprising: a shape memory alloy wire which is contracted or relaxed upon application of an electric current; And a terminal connected to both ends of the shape memory alloy wire, the terminal being connected to the wire-terminal of the auto focus device for a camera, which is configured to have a crimp portion in which the shape memory alloy wire is press- Assembly.

Description

≪ Desc / Clms Page number 1 > WIRE-TERMINEL ASSEMBLY FOR CAMERA <

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-terminal assembly for an automatic focusing device for a camera, and more particularly to a wire-terminal assembly for an automatic focusing device for a camera in which the performance of a shape memory alloy wire can be stably maintained even after a pressing process .

Shape memory alloy wire (SMA-Wire) is an alloy that causes thermoelastic transformation. It is an alloy material whose shape changes elastically at a certain temperature.

In other words, the shape memory alloy wire has a property of remembering the first shape and returning to the shape when the temperature is increased in a state where the alloy wire is deformed into another shape by applying a force to the wire.

Such a shape memory alloy wire is used in an automatic focusing device for a camera which requires fine adjustment.

At this time, the shape memory alloy wire is pressed on a separate terminal and installed in the camera auto focus device.

However, the resistance value of the shape memory alloy wire is variously measured according to the shape of the terminal or the pressing process.

More specifically, in the case of a conventional cylindrical terminal, a shape memory alloy wire is inserted into an empty space inside the cylinder to perform a compression bonding process. At this time, the shape memory alloy wire has a large dead zone as a whole inserted in the terminal is squeezed.

Here, the dead zone refers to the area compressed to fix the shape memory alloy wire.

Such a shape memory alloy wire of the dead zone is deformed due to damage due to a load, so that shrinkage or relaxation becomes impossible.

As the structure of the shape memory alloy wire is partially changed by pressing with the terminal, there is a problem that the area of the shape memory alloy wire that is pressed during the measurement of the resistance value of the shape memory alloy wire acts as noise. In this case, the noise means that the resistance value of the shape memory alloy wire is prevented from being accurately measured.

This noise makes the variation range of the resistance value of the shape memory alloy wire large, making it difficult to fine tune the wire-terminal assembly of the camera autofocus device.

Therefore, there is a need for a wire-terminal assembly of a camera autofocus device in which the performance of the shape memory alloy wire can be stably maintained even after the compression process because the auto focus device for camera requiring fine adjustment has a large influence of noise.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wire-terminal assembly for an automatic focusing device for a camera which minimizes a contact area between a terminal and a shape memory alloy wire and is easy to combine with an automatic focusing device for a camera .

According to an aspect of the present invention, there is provided a wire-terminal assembly for an automatic focusing device for a camera, comprising: a shape memory alloy wire which is contracted or relaxed with application of an electric current; And a terminal connected to both ends of the shape memory alloy wire, the terminal being connected to the wire-terminal of the auto focus device for a camera, which is configured to have a crimp portion in which the shape memory alloy wire is press- Assembly.

In an embodiment of the present invention, the terminal may include a coupling unit fixed to the autofocusing apparatus for the camera and a crimping portion extending and bending at one end of the coupling unit.

In one embodiment of the present invention, the crimping portion can compress and fix the shape memory alloy wire at one or more lines.

In an embodiment of the present invention, the squeeze portion may have a squeeze area of the shape memory alloy wire equal to or more than twice the thickness of the shape memory alloy wire.

The effect of the wire-terminal assembly of the automatic focusing device for a camera according to the present invention will be described below.

According to the present invention, the dead zone can be reduced by including the pressed portion in which the shape memory alloy wire is pressed and fixed in line contact. That is, the shrinkage and relaxation performance of the shape memory alloy wire can be improved. Specifically, as the structure of the shape memory alloy wire is partially changed, it is possible to reduce the phenomenon that the area of the shape memory alloy wire pressed on measuring the resistance value of the shape memory alloy wire acts as noise.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

FIG. 1 is a perspective view of an automatic focusing apparatus for a camera as viewed from above, according to an embodiment of the present invention.
2 is an exploded perspective view of an automatic focusing apparatus for a camera according to an embodiment of the present invention.
3 is a perspective view showing a lower structure of a middle case according to an embodiment of the present invention.
FIG. 4 is a perspective view showing an upper structure of a middle case with an auto focus adjusting unit according to an embodiment of the present invention.
FIG. 5 is a perspective view showing a lower structure of a middle case in which an auto-focus adjusting unit according to an embodiment of the present invention is engaged.
6 is a perspective view of a lever viewed from above, according to an embodiment of the present invention.
7 is a perspective view of a terminal according to an embodiment of the present invention.
8 (a) is a cross-sectional view of a terminal viewed from the front according to an embodiment of the present invention.
8 (b) is a cross-sectional view of a terminal as seen from a side according to an embodiment of the present invention.
9 (a) is a perspective view showing a conventional wire-terminal assembly according to an embodiment of the present invention.
9 (b) is a cross-sectional view of a wire-terminal assembly of an autofocusing apparatus for a camera according to an embodiment of the present invention.
10 (a) is a perspective view of a terminal support according to an embodiment of the present invention, viewed from above.
10 (b) is a perspective view showing a state where the terminal and the terminal support are combined with each other according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when a part is referred to as "comprising ", it means that it can include other components as well, without excluding other components unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a camera autofocusing apparatus viewed from a top surface according to an embodiment of the present invention, and FIG. 2 is an exploded view of a camera autofocusing apparatus according to an embodiment of the present invention.

1 and 2, the automatic focusing apparatus for a camera 1000 includes a lens barrel 1100, an upper case 1200, an elastic part 1150, a middle case 1400, an autofocus adjusting part 1600, A lower case 1800, and a shield cover 1900. [

The lens barrel 1100 is provided between the upper case 1200 and the middle case 1400 and includes a lens (not shown) for photographing the subject.

One end of the elastic part 1150 may be supported on the upper case and the other end may be supported on the elastic supporting unit 1140 protruding along the periphery of the lens barrel 1100. At this time, the elastic portion 1150 may be formed of a spring.

The middle case 1400 is coupled to the upper case 1200 and supports the lens barrel 1100.

The automatic focus adjustment unit 1600 is coupled to the middle case 1400 and adjusts the height of the lens barrel 1100. More specifically, the lens barrel 1100 can be raised or lowered as the shape memory alloy wire 1640 of the automatic initial adjustment unit 1600 is contracted or relaxed.

The lower case 1800 may be coupled to the lower portion of the middle case 1400.

The shield cover 1900 surrounds the upper case 1200, the middle case 1400 and the lower case 1800 and is coupled to the lower case 1800.

Specifically, after the upper case coupling groove 1010, the middle case coupling groove 1020, and the lower case coupling groove 1030 are positioned in a straight line and a fixing member (not shown) is inserted and inserted, the shield cover 1900 The fixing protrusion 1810 protruding from the lower case 1800 can be inserted into the fixing groove 1910 of the main body 1800. [

In order to explain the structure of the middle case 1400 and the auto-focus adjusting unit 1600, the following drawings are referred to.

FIG. 3 is a perspective view showing a lower structure of a middle case according to an embodiment of the present invention, FIG. 4 is a perspective view showing an upper structure of a middle case with an auto focus adjusting unit according to an embodiment of the present invention, FIG. 5 is a perspective view showing a lower structure of a middle case in which an auto-focus adjusting unit according to an embodiment of the present invention is engaged.

3 to 5, the middle case 1400 includes a middle case body 1405, a lever inserting portion 1420, a terminal supporting portion 1430, a tension adjusting portion 1450, and a boundary plate 1480 .

The middle case body 1405 forms an outer shape of the middle case 1400 and can support a part coupled to the middle case 1400.

The lever inserting portion 1420 may be provided at a position where one pair of the lever inserting portions 1420 are opposed to each other on the upper surface of the middle case body portion 1405 and the lever inserting portion 1420 may be engaged with the lever 1700.

The terminal support portion 1430 may protrude from the upper surface of the middle case body portion 1405.

The tension adjusting unit 1450 may be provided on the middle case body 1405 so as to face the terminal supporting unit 1430.

The tension adjusting unit 1450 may be coupled to the tension adjusting groove 1440 formed in the middle case body 1405 to have a predetermined length. At this time, the tension of the shape memory alloy wire 1640 can be adjusted according to the position of engagement with the tension adjusting groove 1440.

When the tension adjusting unit 1450 is engaged with the crescent-shaped tension adjusting groove 1440, the tension of the shape memory alloy wire 1640 is changed according to the engagement position of the tension adjusting groove 1400 It can be different.

The boundary plate 1480 may be provided inside the middle case 1400 to separate the upper case 1200 (see FIG. 2) and the lower case 1800 (see FIG. 2).

At this time, the middle case 1400 is divided into the first process and the second process through the boundary plate 1480, so that the process can be performed simply and stably.

For example, the conventional assembling process was a method of stacking all the parts in the lower case. In this case, the process of assembling each part becomes complicated, and there is no guide for fixing each part, so that an assembly failure occurs.

However, in the automatic focusing device for a camera 1000, the middle case 1400 and the boundary plate 1480 are provided to carry out the first process between the upper case 1200 and the middle case 1400, And the lower case 1800, the assembly process is simplified and simplified.

The auto-focus adjusting unit 1600 may include a shape memory alloy wire 1640, a terminal 1660, and a lever 1700. [

A shape memory alloy wire (SMA-Wire) 1640 is an alloy causing thermoelastic transformation, and is an alloy material whose shape changes elastically at a certain temperature.

That is, when the temperature of the shape memory alloy wire 1640 is increased by applying a force to the alloy wire and deformed into another shape, the shape memory alloy wire 1640 stores the initial shape and returns to the shape.

The auto-focus adjusting unit 1600 can control the shrinkage or relaxation of the shape memory alloy wire 1640 by applying a current to the shape memory alloy wire 1640.

For example, when a current is applied to the shape memory alloy wire 1640, a resistance value is lowered and a volume shrinkage phenomenon occurs while the temperature rises. When the current application is canceled, the temperature is lowered and the volume shrinkage phenomenon is stopped and relaxed again. At this time, the terminal 1660 is coupled to both ends of the shape memory alloy wire 1640, respectively, and can apply current.

The terminal 1660 may include a coupling unit 1664 and a crimping portion 1666. At this time, the coupling unit 1664 and the crimping portion 1666 may be integrally formed.

A detailed description of the terminal 1660 will be described later.

The lever 1700 may be inserted into the lever inserting portion 1420 (see FIG. 3). The lever 1700 will be described in more detail with reference to the following drawings.

6 is a perspective view of a lever viewed from above, according to an embodiment of the present invention.

6, the lever 1700 may include a lever body portion 1710, a lever fixing portion 1730, a lens barrel supporting portion 1720, and a locking portion 1750. [

The lever body portion 1710 may be inserted into the lever insertion portion 1420 so that the lever 1700 is engaged with the middle case 1400 (see FIG. 3).

The lever fixing portion 1730 may protrude symmetrically from the side surface of the lever body portion 1710 and may include a pair of lever engagement grooves 1410 (see FIG. 3) formed at the lower end of the lever insertion portion 1420 (see FIG. 3) Lt; / RTI >

The lens barrel support portion 1720 can support the lens barrel 1100 (see Fig. 2). The lens barrel supporting portion 1720 may protrude from the lever body portion 1710 such that a pair of lens barrel supporting portions 1720 are symmetrical with respect to the center of the lever body portion 1710.

In addition, since the pair of levers 1700 are provided in the middle case body 1405 (see FIG. 3), four lens barrel supporting portions 1720 are provided to support the lens barrel 1100 (see FIG. 2).

2) is raised in the direction of the upper case 1200 (see Fig. 2), the lens barrel support portion 1720 supports the lens barrel 1100 (see Fig. 2) at four positions can do.

However, the shape of the lens barrel support portion 1720 is not limited to one embodiment, and may be included in the configuration of the lens barrel support portion 1720 if the shape capable of supporting the upward or downward movement of the lever 1700 is included.

For example, the number of the lens barrel supporting portions 1720 may be increased to more stably support the lens barrel 1100 (see FIG. 2).

(Not shown) is provided on the end of the lens barrel supporting portion 1720 so that a slipping phenomenon does not occur at a portion contacting the lens barrel supporting portion 1720 when the lens barrel 1100 (see FIG. 2) You can do it.

The latching portion 1750 is provided at the lower portion of the lever body portion 1710, and the shape memory alloy wire 1640 (see FIG. 2) can be supported.

The wire-terminal assembly P of the automatic focusing device for a camera will now be described in detail.

FIG. 7 is a perspective view of a terminal according to an embodiment of the present invention, FIG. 8 (a) is a cross-sectional view of a terminal viewed from the front according to an embodiment of the present invention, Figure 3 is a cross-sectional view of a terminal viewed from the side according to one embodiment of the invention.

7 to 8, the wire-terminal assembly P of the automatic focusing device for a camera is a wire-terminal assembly of the automatic focusing device 1000 for a camera, A terminal 1640 and a terminal 1660.

Terminal 1660 is coupled to both ends of shape memory alloy wire 1640, respectively, and is capable of applying current.

The terminal 1660 may include a coupling unit 1664 and a crimping portion 1666.

Referring to Fig. 3, the coupling unit 1664 can be fixed to the automatic focusing device 1000 (see Fig. 2) for the camera. Specifically, the engaging unit 1664 can be seated and engaged in the terminal engaging groove 1435 of the terminal supporting portion 1430 provided in the camera autofocusing apparatus 1000 (see Fig. 2).

The coupling unit 1664 may be formed in a 'C' shape having one side opened when viewed in section, and each corner may be provided with a bent extension.

The crimping portion 1666 is provided by bending and extending at one end of the coupling unit 1664, and the shape memory alloy wire 1640 can be pressed and fixed.

Terminal 1660 may include a crimping portion 1666 that is press-fit in line contact when the shape memory alloy wire 1640 is viewed in cross-section.

At this time, the reason why the shape memory alloy wire 1640 is pressed and fixed to the crimping portion 1666 in a point-contact manner is to reduce the dead zone (D, see FIG. 9).

The dead zone D (see Fig. 9) refers to a portion where the shape memory alloy wire 1640 is damaged due to the area where the shape memory alloy wire 1640 is fixed.

That is, the shape memory alloy wire 1640 to be compressed is deformed due to damage due to the load, so that shrinkage or relaxation becomes impossible.

Since the shape memory alloy wire 1640 generates noise when measuring the resistance value of the shape memory alloy wire 1640 as a part of the structure is changed, the automatic focusing device for a camera 1000 (Fig. 2 The dead zone D (see Fig. 9) in the wire-terminal assembly P of the automatic focusing device for a camera of FIG.

At this time, noise refers to a phenomenon in which accuracy of the resistance value of the shape memory alloy wire 1640 is lowered.

9 (a) is a perspective view showing a conventional wire-terminal assembly according to an embodiment of the present invention, and FIG. 9 (b) is a perspective view of a wire- Sectional view of the assembly.

9 (a), in the case of the conventional terminal 100, the crimping portion 110 has a flat surface on which the shape memory alloy wire 164 is pressed.

Therefore, when the shape memory alloy wire 164 is pressed and fixed between the crimping portion 110 and the coupling unit 120, the entire area of the compressed shape memory alloy wire 1640 becomes the dead zone D ' .

In other words, an area corresponding to the entire width of the crimping portion 110 can be a dead zone D '.

At this time, the width of the crimping portion 110 refers to the length formed in the longitudinal direction of the shape memory alloy wire 164.

However, if the compression area of the compression bonding portion 1666 is twice or more the thickness of the shape memory alloy wire 1640, it can be sufficiently pressed and fixed.

Therefore, it is unnecessary to form a wide dead zone D 'by pressing and fixing the entire shape memory alloy wire 1640 between the crimping portion 110 and the coupling unit 120.

9B, in the case of the terminal 1660 according to an exemplary embodiment, when the crimping portion 1666 is viewed in cross section, it is in the form of a 'V' which is pressed in a point-to-point manner.

Therefore, when the shape memory alloy wire 1640 is fixed between the 'V' shaped compression unit 1666 and the coupling unit 1664, the dead zone D 'of the conventional terminal 100 is smaller than the dead zone D' D) may be formed to reduce the performance of the shape memory alloy wire 1640 to a lesser degree.

That is, in the conventional crimping portion 110, the dead zone 170 is formed by the entire width of the crimping portion 110 by pressing the shape memory alloy wire 1640 all over the width of the crimping portion 110.

However, the pressing portion 1666 according to one embodiment is formed by pressing a portion of the entire width of the pressing portion 1666 against the dead zone D 'of the conventional pressing portion 110 by pressing the shape memory alloy wire 1640 A smaller dead zone D can be formed.

Therefore, the crimping portion 1666 can compressively fix the shape memory alloy wire at one or more lines when viewed in cross section.

That is, the shape memory alloy wire 1640 can be linearly contacted and compressed when viewed in cross section by making the crimping portion 1666 into a V shape.

Alternatively, the shape of the shape memory alloy wire 1640 may be more stable than the shape of the 'V' shaped crimping portion 1666 by making the crimping portion 1666 U-shaped.

Alternatively, the shape memory alloy wire 1640 can be pressed and contacted at two points when viewed in cross section, by making the crimping portion 1666 'W' shape. By doing so, the stability of the shape memory alloy wire 1640 against separation can be enhanced compared to the 'V' shaped crimping portion 1666.

Alternatively, the shape of the shape memory alloy wire 1640 may be more stable than the shape of the 'V' shaped crimping portion 1666 by making the crimping portion 1666 'T' shape. And, in the case of the 'T' shape, there is no curve and the shape is simple compared to the shapes such as 'V', 'U', and 'W'. Thus, the 'T' shaped crimping portion 1666 may be easier to implement the shape.

The shape of the pressing portion 1666 is not limited to one embodiment and includes changing the shape of the pressing portion 1666 so that the shape memory alloy wire 1640 is pressed and fixed in line contact when viewed in cross section .

On the other hand, if the squeezed area of the squeezed part 1666 is too small, there may arise a problem that the shape memory alloy wire 1640 is separated from the terminal 1660.

Therefore, the compression area of the compression bonding portion 1666 can be made twice or more the thickness of the shape memory alloy wire 1640.

Further, the pressing portion 1666 can use a material capable of preventing slip on the surface in contact with the shape memory alloy wire 1640.

10 (a) is a perspective view of a terminal support according to an embodiment of the present invention, and FIG. 10 (b) is a perspective view showing a state where the terminal and the terminal support are combined with each other according to an embodiment of the present invention. to be.

10, the wire-terminal assembly P of the camera autofocus device through the space accommodated between the compression plate 1140 and the coupling unit 1664 has a middle case body portion 1405 (see FIG. 3) ). ≪ / RTI >

10A, the terminal supporting portion 1430 protrudes from the upper surface of the middle case body 1405 (see FIG. 3), and a terminal supporting portion 1430 is provided at the upper end of the terminal supporting portion 1430, A pair of fastening grooves 1435 may be provided.

The depth of the terminal fastening groove 1435 may be provided to coincide with the thickness of the coupling unit 1664.

10 (b), the engaging unit 1664 can be seated and engaged in the terminal engaging groove 1435 provided in the terminal supporting portion 1430. [

That is, the terminal 1660 can be engaged with the middle case body 1405 (see FIG. 3) by inserting the terminal fastening groove 1435 into the space inside the coupling unit 1664.

The shape of the coupling unit 1664 is not limited to one embodiment and may be modified to facilitate application in a manner that is coupled with the middle case body 1405 (see FIG. 3).

A small projection (not shown) is provided inside the coupling unit 1664 and the terminal support 1430 in contact with the projection of the coupling unit 1664 is provided with a coupling unit 1664 (Not shown) corresponding to the protrusions of the protrusions 1664 and 1664.

That is, when the terminal supporting portion 1430 is completely inserted into the engaging unit 1664, the protrusion provided inside the engaging unit 1664 is fitted into the groove corresponding to the protrusion provided on the terminal supporting portion 1430, The middle case body portion 1405 (see FIG. 3) can be more stably engaged.

3) and the terminal 1660 so as to prevent the portion where the middle case body 1405 (see FIG. 3) and the terminal 1660 are slipped from slipping, You can use materials that can be.

In one embodiment, the shape of the wire-terminal assembly P of the automatic focusing device for a camera is briefly summarized. First, a crimping portion 1666 is provided on the top of the terminal 1640, The shape memory alloy wire is compressed and fixed by one or more wires when viewed in cross section. The coupling unit 1664 is bent and connected to one end of the crimping portion 1666, and the coupling unit 1664 may be provided in a 'C' shape having one side opened when viewed in section. At this time, each of the corners may be bent and extended.

The shape memory alloy wire W is pressed and fixed between the compression bonding portion 1666 and the coupling unit 1664. At this time, the compression bonding area of the shape memory alloy wire W is equal to the thickness of the shape memory alloy wire W So that it can be prevented from coming off.

On the other hand, a terminal supporting portion 1430 is integrally formed on the upper surface of the middle case body 1405 (see FIG. 3), and a pair of terminal fitting grooves 1435 may be provided on the upper end of the terminal supporting portion 1430. The coupling unit 1664 is seated and engaged in the terminal fitting groove 1435 so that the wire-terminal assembly P of the autofocusing apparatus for a camera and the autofocusing apparatus 1000 for a camera can be combined.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100: Terminal 110:
120: coupling unit 164: shape memory alloy wire
1000: automatic focusing device for camera 1010: upper case fastening groove
1020: Middle case fastening groove 1030: Lower case fastening groove
1100: lens barrel 1140: elastic support unit
1150: elastic part 1200: upper case
1400: Middle case 1405: Middle case body part
1410: lever coupling groove 1420: lever insertion portion
1430: Terminal support portion 1435: Terminal fastening groove
1440: tension adjusting groove 1450: tension adjusting portion
1480: Boundary plate 1600: Auto focus adjustment unit
1640: shape memory alloy wire 1660: terminal
1664: Coupling unit 1666:
1700: Lever 1710: Lever body part
1720: lens barrel support part 1730: lever fixing part
1750: engaging portion 1800: lower case
1810: Fixing projection 1900: Shield cover
1910: Fixing groove D: Dead zone
P: Wire-to-terminal assembly of an autofocus device for a camera

Claims (4)

A wire-terminal assembly of an autofocusing device for a camera,
A shape memory alloy wire which shrinks or relaxes upon application of an electric current; And
A terminal connected to both ends of the shape memory alloy wire and through which a current flows,
The terminal comprises:
A coupling unit fixed to the autofocusing apparatus for the camera and having one side opened; And
A press-bonding portion which is bent at one end of the coupling unit and in which the shape memory alloy wire is pressed and fixed by point contact;
Lt; / RTI >
The press-
The shape memory alloy wire is compressed and fixed in point contact only at a portion thereof
A wire-terminal assembly of an autofocus device for a camera.
delete The method according to claim 1,
Wherein the press-bonding portion press-fixes the shape memory alloy wire at one or more points. ≪ RTI ID = 0.0 > 11. < / RTI >
The method according to claim 1,
Wherein the compression bonding portion is characterized in that the compression bonding area of the shape memory alloy wire is at least twice the thickness of the shape memory alloy wire.

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