Connection terminal, and connection method using the connection terminal.

Abstract

To provide a connection terminal that is self-supporting.SOLUTION: A connection terminal (1A), both ends of which are electrically connected, includes a first terminal part (10) located at one end of the connection terminal and a second terminal part (11) located at the other end of the connection terminal. The center of gravity (G1) of the connection terminal is located between the first and second terminal parts, below a fulcrum (P1) of the balance of the connection terminal.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a connection terminal and a connection method using the connection terminal. [Background Art]

[0002] Patent Document 1 discloses a metal holding member fastened to an inner housing with a screw and soldered to an electric substrate. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Patent Laid-Open No. 2005-303159 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] Incidentally, when a connection terminal is mounted on a first connection target such as a substrate, and then a second connection target is fixed to the connection terminal to electrically connect the first connection target and the second connection target, problems such as the connection terminal being unable to stand on its own and falling off before being mounted on the first connection target may occur. In order to prevent such problems, it is necessary to take measures such as holding the connection terminal before fixation, which may restrict the design of the first connection target and the second connection target.

[0005] An object of one aspect of the present disclosure is to provide a connection terminal that stands on its own when placed on a first connection target. [Means for Solving the Problem]

[0006] In order to solve the above problem, a connection terminal according to an aspect of the present disclosure is a connection terminal having both ends electrically connected, comprising: a first terminal portion disposed at one end of the connection terminal; and a second terminal portion disposed at the other end of the connection terminal, wherein the center of gravity of the connection terminal is located below the balance fulcrum of the connection terminal, the balance fulcrum being located between the first terminal portion and the second terminal portion.

[0007] With the above configuration, the center of gravity of the connecting terminal is located below the fulcrum, so the connecting terminal can be balanced like a seesaw and stand on its own.

[0008] Furthermore, in a connection terminal according to one aspect of this disclosure, at least one of the first terminal portion and the second terminal portion is a terminal that is melt-bonded to a substrate. Here, melt bonding includes soldering, brazing, welding, bonding with conductive adhesive, etc.

[0009] According to the above configuration, the connection terminals for melt bonding are stable when they are positioned, thus reducing the occurrence of melt bonding defects such as soldering defects.

[0010] Furthermore, in a connection terminal according to one aspect of the present disclosure, at least one of the first terminal portion and the second terminal portion has a center of gravity position adjustment portion that protrudes upward.

[0011] According to the above configuration, the connection terminal can be designed so that its center of gravity is positioned far enough away from the pivot point that the terminal is self-supporting.

[0012] Furthermore, in a connection terminal according to one aspect of the present disclosure, the first terminal portion is melt-bonded to the mounting surface of the connection terminal, and the connection terminal includes a first stress absorbing portion that absorbs stress in a first direction connecting the first terminal portion and the second terminal portion, which is applied to the first terminal portion when the second terminal portion is connected to an object to be connected, and a second stress absorbing portion that absorbs stress in a second direction intersecting the first direction, which is applied to the first terminal portion when the second terminal portion is connected to an object to be connected.

[0013] According to the above configuration, the connection terminal has a first stress absorption section and a second stress absorption section. When the second terminal section is connected to the object to be connected after the first terminal section has been melt-bonded to the mounting surface, the stress applied to the first terminal section is absorbed, thereby improving the long-term reliability of the melt-bonded connection.

[0014] Furthermore, in a connection terminal according to one aspect of the present disclosure, the second stress absorption portion has a locking portion that can be inserted into an opening provided on the aforementioned mounting surface, and an arm portion that extends from the pivot point of the connection terminal toward the locking portion.

[0015] According to the above configuration, the position where the connection terminals are placed can be determined.

[0016] Furthermore, in a connection terminal according to one aspect of the present disclosure, the locking portion protrudes from the arm portion and has a tapered portion whose width decreases towards the tip.

[0017] With the above configuration, since the locking portion has a tapered portion whose width decreases towards the tip, the locking portion can be easily inserted into the opening of the mounting surface.

[0018] To solve the above problems, a connection method according to one aspect of the present disclosure comprises a positioning step of inserting the locking portion of the connection terminal of the above aspect into the opening, and a soldering step of connecting one of the first terminal portion and the second terminal portion of the connection terminal in which the locking portion was inserted into the opening in the positioning step to a first connection target by soldering.

[0019] With the above configuration, the center of gravity of the connection terminal is located below the pivot point, so the connection terminal is balanced like a seesaw and stands on its own. Therefore, when the soldering step is performed after the positioning step, the problem of the connection terminal falling off is less likely to occur.

[0020] Furthermore, a connection method according to one aspect of the present disclosure includes a fastening step in which the terminal portion of the first terminal portion and the second terminal portion that was not soldered in the soldering step is fastened to the second connection target.

[0021] According to the above configuration, when one of the first and second terminals is soldered to the mounting surface and the other is connected to the object to be connected, the stress applied to the soldered side is absorbed, thereby improving the long-term reliability of the soldering. [Effects of the Invention]

[0022] According to one aspect of the present disclosure, the connection terminal can be self-supporting when disposed on the first connection object. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] [Figure 1] FIG. 1 is a perspective view of a connection terminal according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a diagram showing a state where a connection terminal according to an embodiment of the present disclosure is disposed on a substrate. [Figure 3] FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2. [Figure 4] FIG. 4 is a diagram showing an example of a connection object to which a connection terminal according to an embodiment of the present disclosure is fixed. [Figure 5] FIG. 5 is a diagram showing a comparative example for a connection terminal according to an embodiment of the present disclosure. [Figure 6] FIG. 6 is a flowchart showing the step of connecting a substrate and a connection object using a connection terminal according to an embodiment of the present disclosure. DESCRIPTION OF EMBODIMENTS

[0024] Hereinafter, an embodiment of the present disclosure will be described in detail. FIG. 1 is a perspective view of a connection terminal 1 according to an embodiment of the present disclosure. The connection terminal 1 includes a first terminal portion 10, a second terminal portion 11, and a support portion 14. Hereinafter, as indicated by the arrows in FIG. 1, the X-axis direction, Y-axis direction, and Z-axis direction of the connection terminal 1 are defined.

[0025] The connector 1 is formed by bending or other processes applied to a sheet of conductive material such as metal. The connector 1 has a first terminal portion 10, a support portion 14, and a second terminal portion 11 arranged in the order described above along the X-axis direction, and electrically connects the first terminal portion 10 and the second terminal portion 11. The first terminal portion 10 is located at one end of the connector 1 and is connected to the pattern wiring of a circuit board by reflow soldering or the like. The second terminal portion 11 is located at the other end of the connector 1 and has a screw hole 12. The second terminal portion 11 is fixed to the object to be connected by inserting a fastening member such as a screw or bolt into the screw hole 12.

[0026] A center of gravity adjustment section 13 is formed on the first terminal portion 10 of the connection terminal 1 by bending a predetermined end in the Z-axis direction. In Figure 1, the end of the first terminal portion 10 of the connection terminal 1 that faces the side connected to the support portion 14 is bent so that the center of gravity adjustment section 13 protrudes from the first terminal portion 10. Hereafter, the surface of the first terminal portion 10 on the side from which the center of gravity adjustment section 13 protrudes will be called the front surface, and the surface opposite to the front surface will be called the back surface. The back surface of the first terminal portion 10 is the surface that is soldered to the pattern wiring of the circuit board, etc. Also below, the direction in which the front surface of the first terminal portion 10 faces will be called upward in the Z-axis direction, and the direction in which the back surface faces will be called downward in the Z-axis direction. For example, the center of gravity adjustment section 13 protrudes upward in the Z-axis direction from the front surface of the first terminal portion 10.

[0027] The support portion 14 has an upper surface portion 14A located above the first terminal portion 10 in the Z-axis direction. The support portion 14 has arm portions 15A and 15B extending from the upper surface portion 14A along the Y-axis direction. Arm portion 15A is bent downward in the Z-axis direction at a predetermined distance from the upper surface portion 14A in the Y-axis direction, and a locking portion 16A is provided at its tip. Arm portion 15B is provided at a position opposite to arm portion 15A, with the upper surface portion 14A in between. Arm portion 15B is bent downward in the Z-axis direction at a predetermined distance from the Y-axis direction, and a locking portion 16B is provided at its tip. The locking portions 16A and 16B have tapered portions 19 whose width decreases towards their tips, and the taper angle at the tip of the tapered portion 19 is less than 90 degrees.

[0028] The support portion 14 has a first surface 17 extending downward in the Z-axis direction from the edge of the upper surface portion 14A facing the second terminal portion 11, and a second surface 18 extending downward in the Z-axis direction from the edge of the upper surface portion 14A facing the first terminal portion 10. The second terminal portion 11 is electrically connected to the first terminal portion 10 via the first surface 17, the upper surface portion 14A, and the second surface 18.

[0029] The position and shape of the second terminal portion 11 of the connection terminal 1 are determined according to the shape of the object to be connected. For example, the position and shape of the second terminal portion 11 of the connection terminal 1 are determined by determining the center position and diameter of the screw hole 12 in the second terminal portion 11 and the length of the first surface 17 extending from the upper surface portion 14A, in accordance with the screw hole of the object to be connected.

[0030] The electrical connection using the connection terminal 1 will be explained using Figure 2. Figure 2 is a perspective view showing a state in which a connection terminal 1A, which is an example of a connection terminal 1, is placed on a substrate 20. The substrate 20 has pattern wiring 21 on the mounting surface 20A of components such as integrated circuits. The pattern wiring 21 is ground wiring provided under integrated circuits, etc., and power wiring for supplying power to various parts of the substrate 20. The substrate 20 has openings 22A and 22B on the mounting surface 20A. The locking portions 16A and 16B of the connection terminal 1A are inserted into the openings 22A and 22B of the substrate 20, respectively, in order to position the connection terminal 1A at the mounting position on the mounting surface 20A of the substrate 20. The substrate 20 is designed so that when the locking portions 16A and 16B of the connection terminal 1A are inserted into the openings 22A and 22B of the substrate 20, respectively, the back surface of the first terminal portion 10 is positioned on the pattern wiring 21 of the substrate 20. The locking portions 16A and 16B of the connection terminal 1A may be soldered to the substrate 20 by, for example, through-hole reflow soldering.

[0031] Figure 3 shows the cross-section AA of Figure 2. As shown in Figure 3, the connection terminal 1A is designed such that when the back surface of the first terminal portion 10 is placed on the pattern wiring 21 of the substrate 20, the second terminal portion 11 is located below the mounting surface 20A of the substrate 20 in the Z-axis direction. The position of the second terminal portion 11 is designed to match the design of the screw fastening portion of the object to be connected to the second terminal portion 11.

[0032] Figure 4 shows an example of a screw-tightening portion 31 of the object to be connected 30. The object to be connected 30 has a protruding screw-tightening portion 31, and the amount of protrusion is shorter than the thickness of the substrate 20. The length of the first surface 17 of the connection terminal 1A, which extends from the top surface 14A, is set to the length at which the second terminal portion 11 contacts the screw-tightening portion 31 when the first terminal portion 10 is placed on the pattern wiring 21 of the substrate 20.

[0033] As shown in Figure 3, the connector 1A is designed so that it does not tilt and fall off towards the second terminal portion 11 even when the back surface of the first terminal portion 10 is positioned on the pattern wiring 21 of the circuit board 20. Specifically, the connector 1A is designed so that the pivot point P1 is located on the upper surface portion 14A, and the center of gravity G1 is located at a sufficiently large distance below the pivot point P1 in the Z-axis direction. The pivot point P1 is located at an intermediate position between the first terminal portion 10 and the second terminal portion 11. The distance between the center of gravity G1 and the pivot point P1 is adjusted during the design stage of the connector 1A using the length of the second surface 18, that is, the height of the upper surface portion 14A in the Z-axis direction relative to the first terminal portion 10.

[0034] The positions of the pivot point P1 and the center of gravity G1 along the X-axis are adjusted during the design phase of the connection terminal 1A by the length of the center of gravity position adjustment section 13 extending from the first terminal section 10. The positions of the pivot point P1 and the center of gravity G1 along the Y-axis are adjusted during the design phase of the connection terminal 1A by the lengths of the arm sections 15A and 15B, respectively.

[0035] Using the comparative example shown in Figure 5, the advantages of positioning the center of gravity of the connection terminal 1A below the pivot point in the Z-axis direction will be explained. Figure 5 shows a flat plate-shaped connection terminal 40 as a comparative example. In the connection terminal 40, the pivot point P2 and the center of gravity G2 are located at approximately the same height. Therefore, when soldering one end of the connection terminal 40 to the pattern wiring 21 of the substrate 20, the connection terminal 40 will fall off unless the other end having the screw hole 41 is supported by a retaining part 20B or the like, as shown in the upper Figure 501. Because the end having the screw hole 41 needs to be held by a retaining part 20B or the like, it is difficult to provide the screw hole 41 below the mounting surface 20A of the substrate 20. In addition, in order to fasten the object to be connected to the screw hole 41 of the connection terminal 40, it is necessary to remove the retaining part 20B from below the screw hole 41, as shown in the middle Figure 502 of Figure 5, which increases the number of steps.

[0036] In Figure 5, lower section 503, the screw tightening portion 51 of the object to be connected 50 is in contact with the screw hole 41 of the connection terminal 40. Since the screw hole 41 is located above the mounting surface 20A of the substrate 20, in order to bring the screw tightening portion 51 into contact with the screw hole 41, the screw tightening portion 51 must protrude from the object to be connected 50 by more than the thickness of the substrate 20, which limits the design freedom of the object to be connected 50.

[0037] On the other hand, the connection terminal 1A shown in Figure 3 can be designed so that it does not fall off when the first terminal portion 10 is placed on the pattern wiring 21 of the circuit board 20. Specifically, first, the dimensions of the first surface 17A, as well as the position and diameter of the screw hole 12 on the second terminal portion 11, are determined to match the screw tightening portion 31 that protrudes from the front surface of the object to be connected 30. Next, the center of gravity position of the connection terminal 1A can be adjusted by adjusting the length of the center of gravity position adjustment portion 13 extending from the first terminal portion 10, as well as the lengths of the first surface 17, the second surface 18, the arm portion 15A, and the arm portion 15B extending from the upper surface portion 14A.

[0038] Figure 6 is a flowchart showing the steps for electrically connecting the substrate 20 and the object to be connected 30 using the connection terminal 1A.

[0039] In step S100, the first terminal portion 10 of the connection terminal 1A is positioned on the pattern wiring 21 of the substrate 20. For example, the upper surface portion 14A of the connection terminal 1A is picked up by a mounting suction nozzle. Next, the connection terminal 1A is transported so that the first terminal portion 10 is positioned on the pattern wiring 21 of the substrate 20. For example, the locking portions 16A and 16B of the connection terminal 1 are inserted into openings 22A and 22B, thereby positioning the first terminal portion 10 of the connection terminal 1A on the pattern wiring 21 of the substrate 20. In step S101, the first terminal portion 10 of the connection terminal 1A is soldered to the pattern wiring 21 of the circuit board 20 by reflow soldering or the like.

[0040] In step S102, the second terminal portion 11 of the connection terminal 1A is fixed to the screw tightening portion 31 of the object to be connected 30. When the second terminal portion 11 is fixed to the screw tightening portion 31, stress may be applied to the solder joint between the first terminal portion 10 and the pattern wiring 21. The support portion 14 is an example of a first stress absorption portion, and its crank shape, formed by the upper surface portion 14A, the first surface 17A, and the second surface 18, can absorb the component of the stress applied to the solder joint that is in the first direction connecting the first terminal portion 10 and the second terminal portion 11, for example, the component in the X-axis direction. In addition, the arms 15A and 15B extending from the upper surface portion 14A of the support portion 14 are an example of a second stress absorption portion, and can absorb the component of the stress applied to the solder joint that is in the second direction intersecting the first direction, for example, the component in the Y-axis direction. Of the stress applied to the soldered portion, the component in the third direction intersecting the first and second directions, for example, the component in the Z-axis direction, can be absorbed by the crank shape of the support portion 14 and the soldered locking portions 16A and 16B, etc.

[0041] [Effects] A connection terminal 1A according to one embodiment of the present disclosure is a connection terminal whose two ends are electrically connected, comprising a first terminal portion 10 located at one end and a second terminal portion 11 located at the other end. The center of gravity G1 of the connection terminal 1A is located between the first terminal portion 10 side and the second terminal portion 11 side, and is located below the pivot point P1 of the balance of the connection terminal 1A. With the above configuration, because the center of gravity G1 of the connection terminal 1A is located below the pivot point P1, the connection terminal 1A can be balanced like a seesaw and stand on its own.

[0042] In one embodiment of the present disclosure, the connection terminal 1A has a first terminal portion 10 which is a terminal for soldering. With this configuration, the connection terminal 1A is stable when placed for soldering, so the occurrence of defects such as poor soldering can be reduced.

[0043] In one embodiment of the present disclosure, the connection terminal 1A has a center of gravity adjustment portion 13 that protrudes upward from the first terminal portion 10. With this configuration, the position of the center of gravity G1 of the connection terminal 1A can be designed to be away from the pivot point P1 to such an extent that the connection terminal 1A can stand on its own.

[0044] In one embodiment of the present disclosure, the connection terminal 1A has a first terminal portion 10 that is soldered to the mounting surface 20A of the connection terminal 1A. The connection terminal 1A has a crank shape formed by an upper surface portion 14A, a first surface 17A, and a second surface 18, so that it can absorb the stress in the first direction connecting the first terminal portion 10 and the second terminal portion 11 that is applied to the first terminal portion 10 when the second terminal portion 11 is connected to the object to be connected. In addition, the connection terminal 1A has arms 15A and 15B extending from the upper surface portion 14A of the support portion 14, so that it can absorb stress in a second direction intersecting the first direction. Therefore, since the stress applied to the first terminal portion 10 when the second terminal portion 11 is connected to the object to be connected after the first terminal portion 10 has been soldered to the mounting surface 20A is absorbed, the long-term reliability of the soldering can be improved.

[0045] According to one embodiment of the present disclosure, the connecting terminal 1A has locking portions 16A and 16B that can be inserted into openings 22A and 22B provided on the mounting surface 20A, and arm portions 15A and 15B that extend from the upper surface portion 14A where the pivot point P1 is located toward the locking portions 16A and 16B. With the above configuration, the position in which the connecting terminal 1A is placed can be determined.

[0046] In a connection terminal 1 according to one embodiment of the present disclosure, the locking portions 16A and 16B protrude from the arm portions 15A and 15B and have a tapered portion 19 whose width decreases towards the tip. With the above configuration, since the locking portions 16A and 16B have a tapered portion 19, the locking portions 16A and 16B can be easily inserted into the openings 22A and 22B of the mounting surface 20A.

[0047] A connection method according to one embodiment of the present disclosure includes a positioning step (S100) in which locking portions 16A and 16B of the connection terminal 1 are inserted into openings 22A and 22B, and a soldering step (S101) in which one of the first terminal portion 10 and the second terminal portion 11 of the connection terminal 1A, into which the locking portions 16A and 16B have been inserted in the positioning step, is connected to the substrate 20 (first connection target) by soldering. With the above configuration, since the center of gravity G1 of the connection terminal 1A is located below the fulcrum P1, the connection terminal 1 is balanced like a seesaw and stands on its own, so the problem of the connection terminal 1 falling off when the soldering step is performed after the positioning step is less likely to occur.

[0048] A connection method according to one embodiment of the present disclosure includes a fastening step (S102) in which the terminal portion that was not soldered in the soldering step (S101) of the first terminal portion 10 and the second terminal portion 11 is fastened to the second connection target. With the above configuration, when one of the first terminal portion 10 and the second terminal portion 11 is soldered to the mounting surface 20A and the other is connected to the connection target, the stress applied to the soldered side is absorbed, thereby improving the long-term reliability of the soldering.

[0049] [Variation] In the above embodiment, the first terminal portion 10 of the connection terminal 1A is fixed to the pattern wiring 21 of the substrate 20 by soldering, and the second terminal portion 11 is fixed to the object to be connected 30 using fastening members such as screws and bolts. However, the connection terminal 1A only needs to have at least one of the first terminal portion 10 and the second terminal portion 11 that is melt-bonded to the substrate. Here, melt-bonding includes soldering, brazing, welding, bonding with conductive adhesive, etc. For example, the second terminal portion 11 may be a soldering terminal fixed to the object to be connected 30 by soldering. Also, if one of the first terminal portion 10 and the second terminal portion 11 is not a melt-bonding terminal, the method of fixing the terminal portion is not limited to fastening members such as screws. For example, the terminal portion may be fixed to the object to be connected 30 using a method such as rivets. The connection terminal 1A may also be a terminal in which both the first terminal portion 10 and the second terminal portion 11 are fixed by melt-bonding such as soldering.

[0050] In the above embodiment, the center of gravity adjustment section 13 is formed by bending the end of the first terminal section 10 of the connecting terminal 1 that faces the side connected to the support section 14 in the Z-axis direction. However, the end of the first terminal section 10 on which the center of gravity adjustment section 13 is provided is not limited to the end facing the side connected to the support section 14. For example, it may be formed by bending the side of the first terminal section 10 in the Z-axis direction. Alternatively, the center of gravity adjustment section 13 may be provided on the second terminal section 11, or on both the first and second terminal sections 10. Furthermore, the center of gravity adjustment section 13 may be formed by methods other than bending. For example, a projection may be welded to the front surface of the first terminal section 10.

[0051] In the above embodiment, the arms 15A and 15B extend from the upper surface 14A of the support portion 14 along the Y-axis. However, the number of arms 15 extending from the upper surface 14A of the support portion 14 is not limited to two. Furthermore, the number and shape of the arms 15 can be changed in accordance with the design of the second terminal portion 11, the design of the substrate 20, etc.

[0052] This disclosure is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of this disclosure. [Explanation of Symbols]

[0053] 1, 1A connection terminal 10 1st terminal section 11 2nd terminal section 13 Center of gravity position adjustment section 14 Support part 14A Top part 15, 15A, 15B arm 16A, 16B Locking part 19 Tapered section 20 circuit boards 20A Mounting surface 22A, 22B opening 30 objects to connect G1 center of gravity P1 Anchor point

Claims

1. A connection terminal in which both ends are electrically connected, A first terminal portion is located at one end of the aforementioned connection terminal, It comprises a second terminal portion located at the other end of the aforementioned connection terminal, The center of gravity of the connection terminal is located between the first terminal portion and the second terminal portion, and is located below the fulcrum of the balance of the connection terminal. The first terminal portion is placed on the mounting surface on which the connection terminal is placed, The second terminal portion is not placed on the aforementioned mounting surface. The first terminal portion is characterized by having a center of gravity position adjustment portion that protrudes upward.

2. The connection terminal according to claim 1, characterized in that the first terminal portion is a terminal that is melt-bonded to a substrate.

3. The first terminal portion is melt-bonded to the aforementioned mounting surface, The aforementioned connection terminal is A first stress absorption section absorbs the stress applied to the first terminal section in a first direction connecting the first terminal section and the second terminal section when the second terminal section is connected to the object to be connected, The connection terminal according to claim 1, further comprising a second stress absorbing portion that absorbs stress applied to the first terminal portion in a second direction intersecting the first direction when the second terminal portion is connected to an object to be connected.

4. The connection terminal according to claim 3, characterized in that the second stress absorbing portion has a locking portion that can be inserted into an opening provided on the aforementioned mounting surface, and an arm portion that extends from the pivot point of the connection terminal toward the locking portion.

5. The connection terminal according to claim 4, characterized in that the locking portion protrudes from the arm portion and has a tapered portion whose width decreases towards the tip.

6. A positioning step of inserting the locking portion of the connection terminal according to claim 4 or 5 into the opening, A soldering step in which, in the positioning step, the locking portion is inserted into the opening, and one of the first terminal portion and the second terminal portion of the connection terminal is connected to the first connection target by soldering, A connection method characterized by comprising the following features.

7. The connection method according to claim 6, further comprising a fastening step of fastening the one of the first terminal portion and the second terminal portion that was not soldered in the soldering step to the second connection target.

8. A connection terminal having both ends electrically connected, A first terminal portion is located at one end of the aforementioned connection terminal, It comprises a second terminal portion located at the other end of the aforementioned connection terminal, The center of gravity of the connection terminal is located between the first terminal portion and the second terminal portion, and is located below the fulcrum of the balance of the connection terminal. The first terminal portion is melt-bonded to the mounting surface of the connection terminal. The aforementioned connection terminal is A first stress absorption section absorbs the stress applied to the first terminal section in a first direction connecting the first terminal section and the second terminal section when the second terminal section is connected to the object to be connected, The second terminal portion has a second stress absorbing portion that absorbs stress applied to the first terminal portion in a second direction intersecting the first direction when the second terminal portion is connected to the object to be connected, The second stress absorption portion is characterized by having a locking portion that can be inserted into an opening provided on the aforementioned mounting surface, and an arm portion that extends from the pivot point of the connection terminal toward the locking portion.

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