JPH09293820A - Terminal of electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal of electric apparatus which allows the electric apparatus to be mounted on the surface of a printed board at high density. SOLUTION: A terminal 3 of an electric apparatus extending from a main body 1 of the apparatus to be mounted on the surface 21 of a printed board 2 has a lead piece 31 extending from the main body 1 and a connecting piece 32 which is approximately perpendicular to the lead piece 31 and connected to the printed board 2. Both pieces 31 and 32 form approximately a T-shape structure and part or entire connecting piece 32 is disposed between the main body 1 and printed board 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to terminals of surface-mounted electrical equipment such as electromagnetic relays and switches.

[0002]

2. Description of the Related Art Conventionally, as a terminal A of this kind of electric equipment, there is one having a structure shown in FIGS. This is composed of a lead-out piece A1 led out from the electric device body B, and a connecting piece A2 formed by bending the lead-out piece A1 into a substantially L-shape and connected to the printed circuit board C.

More specifically, the electric device is composed of an electric device body B and a terminal A, and a connecting piece A2 is arranged between the electric device body B and the printed circuit board C and connected by soldering. . However, the connecting piece A2 is provided on the side opposite to the electric device body B side.

[0004]

In the terminal A of the conventional electric equipment described above, the connection piece A2 can be connected to the board surface C1 of the printed board C to surface-mount the electric equipment on the board surface C1.

However, since the connecting piece A2 of the terminal A is extended on the side opposite to the electric equipment main body B side, the board surface C
The mounting area of the electric device in No. 1 was large, and high-density mounting could not be performed. Also, the printed circuit board C
In some cases, the thermal expansion coefficient of the electric equipment body B differs from that of the electric equipment body B, and stress is applied to the lead-out piece A1 due to the difference, and a solder crack occurs in the solder portion of the lead-out piece A1.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a terminal of an electric device on which the electric device can be surface-mounted on the substrate surface of the printed circuit board with high density.

[0007]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, in a terminal of an electric device which is led out from the main body of the electric device and is surface-mounted on the substrate surface of a printed circuit board, The terminal is formed in a substantially T-shape by a lead-out piece led out from the electric device body and a connecting piece that is connected to the printed circuit board substantially orthogonal to the lead-out piece, and a part or all of the connecting piece is formed. It is arranged between the electric device body and the printed circuit board.

According to a second aspect of the present invention, in the first aspect of the present invention, the connecting piece is a bent piece in which the lead-out piece is formed in a substantially L shape and is bent in one direction of the electric device body side. , And the extended piece connected to the bent piece and extended in the other direction.

According to a third aspect of the present invention, in the second aspect, the extending piece is configured to extend from both sides of the bending piece.

According to a fourth aspect of the present invention, in the first aspect, the lead-out piece has a stress relaxing means for relaxing stress caused by a difference in coefficient of thermal expansion between the printed circuit board and the electric device body. It has a structure provided.

According to a fifth aspect of the present invention, in the fourth aspect, the stress relaxation means is a through hole provided in the thickness direction of the lead-out piece.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 is the main body of the electric equipment.
A coil and a contact portion (not shown) are provided inside, and the contact portion is opened and closed by a coil current to open and close a load current of a connected external device (not shown).

Reference numeral 3 denotes a terminal, which is a thin plate-shaped metal formed of copper or a copper alloy by press working. A lead-out piece 31 led out from the electric equipment body 1, a bent piece 32a formed by bending the lead-out piece 31 in one direction toward the electric equipment body 1 in a substantially L shape, and the bent piece 32a. And the extending piece 32b extending in the other direction, that is, the opposite side to the electric device body 1 side. That is, the connecting piece 32 is formed of the bent piece 32a and the extending piece 32b, and is formed substantially in a T-shape with the lead-out piece 31 so as to be substantially orthogonal to the lead-out piece 31.

The lead-out piece 31 has a through hole 31a provided in the plate thickness direction, and a side wall 31b between both side surfaces and the through hole 31a.
Is formed.

Since the terminals 3 of the electric device body 1 are formed in a substantially T-shape, the connection piece 32 formed by the bent piece 32a and the extended piece 32b is soldered to the printed circuit board 2 in a self-standing state. Will be connected.

At this time, the entire bent piece 32a and a part of the extended piece 32b, that is, a part of the connection piece 32 are arranged and connected between the electric device body 1 and the printed circuit board 2. The bent piece 32a is bent toward the electric equipment main body 1 side, and therefore, the state of joining the solder between the bent piece 32a and the board surface 21 of the printed board 2 can be confirmed from the opposite side of the electric equipment main body 1. Become. In this way, the electric device is surface-mounted on the board surface 21 of the printed board 2.

When the temperature rises while the connecting piece 32 is connected to the printed circuit board 2, a difference in the coefficient of thermal expansion occurs between the printed circuit board 2 and the electric equipment body 1 in the direction along the board surface 21, The stress due to the difference is applied to the lead-out piece 31. Here, the side wall 31b formed by providing the through hole 31a in the lead-out piece 31 is bent by the generated stress and relaxes the stress, that is, the through hole 31a forms a stress relaxing means. .

In the terminal of the electric device according to the first embodiment, as described above, the lead-out piece 31 from which the terminal 3 is led out from the electric-apparatus body 1 and the connecting piece 32 substantially orthogonal to the lead-out piece 31. Since it is formed into a substantially T shape with and,
Is connected to the board surface 21 of the printed board 2, the connecting piece 3
A part of 2 is arranged between the electric device main body 1 and the printed circuit board 2, and the length of the connecting piece 32 protruding outside from the projection surface of the electric device main body 1 projected onto the board surface 21 is shortened. ,
By reducing the mounting area of the electric device on the board surface 21,
After securing the connection area, surface mounting can be performed with high density.

A bent piece 32a is formed by bending the lead-out piece 31 into a substantially L shape toward the electric equipment body 1 side, and the bent piece 3a.
Since the connecting piece 32 is formed by the extension piece 32b connected to 2a and extending to the opposite side of the electric device body 1, the bending piece 32a and the board surface of the printed circuit board 2 are formed from the opposite side of the electric device body 1. It is possible to further improve the connection reliability with the printed circuit board 2 by visually inspecting the connection state of solder with 21.

Further, since the lead-out piece 31 is provided with the stress relaxation means, the stress relaxation means is caused by the difference in the coefficient of thermal expansion in the direction along the board surface 21 between the printed circuit board 2 and the electric equipment body 1. The stress can be relaxed, and the solder cracks generated in the lead-out piece 31 can be reduced.

Further, since the stress relaxation means is the through hole 31a provided in the plate thickness direction of the lead-out piece 31, the side wall 31b formed by the side surface of the lead-out piece 31 and the through hole 31a bends to relax the stress. Thus, the stress relaxation means can be easily formed by pressing.

In the first embodiment, the connecting piece 32 is formed of the bent piece 32a and the extending piece 32b.
If it is formed in a substantially T shape with the lead-out piece 31, the connecting piece 32 may be formed by one piece without being separated into the bent piece 32a and the extended piece 32b, and is not limited.

Further, in the first embodiment, the bent piece 32a is bent and formed in one direction on the side of the electric device body 1 to form the extended piece 3a.
Although 2b is extended in the other direction, the respective directions are not limited.

In the first embodiment, the stress relaxation means is the through hole 31a provided in the lead-out piece 31. However, the stress relaxation means is used at room temperature, and the difference in the coefficient of thermal expansion between the printed circuit board 2 and the electric equipment body 1 may be caused. When the resulting stress does not occur, the stress relieving means may not be provided, and the stress relieving means may be formed by the lead-out piece 31 having a small plate width or a thin plate thickness so as to be bent by the stress. Not done.

In the first embodiment, a part of the connecting piece 32 is arranged between the electric device body 1 and the printed circuit board 2, but the entire connecting piece 32 is arranged between the electric device body 1 and the printed circuit board 2. It may be placed between and is not limited.

A second embodiment of the present invention will be described below with reference to FIG. In the second embodiment, functions different from those in the first embodiment will be described, and members having substantially the same functions as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

The terminal 3 includes a lead-out piece 31 led out from the electric equipment body 1 and a bent piece 32a formed by bending the lead-out piece 31 in one direction toward the electric equipment body 1 in a substantially L-shape. The bent piece 32a is connected to the bent piece 32a in the other direction, that is, the extending pieces 32b and 32b extending from both sides of the bent piece 32a toward the opposite side to the electric device body 1 side. The connection piece 32 is formed of a bent piece 32a and both extending pieces 32b and 32b, and is formed substantially in a T shape with the lead-out piece 31 so as to be substantially orthogonal to the lead-out piece 31.

In the terminal of the electric device according to the second embodiment, as described above, the extending piece 32b is the bending piece 32a.
Since it is extended from both sides, the connection area with the substrate surface 21 can be increased and the connection reliability can be improved.

[0030]

According to the first aspect of the present invention, the terminal is formed in a substantially T-shape by the lead-out piece led out from the main body of the electric device and the connecting piece substantially orthogonal to the lead-out piece. When connected to the board surface of the printed circuit board, some or all of the connection pieces are placed between the electric device body and the printed circuit board to reduce the mounting area of the electric device on the board surface and to secure the connection area. Thus, surface mounting can be performed with high density.

According to a second aspect of the present invention, in addition to the effect of the first aspect, a bent piece in which the lead-out piece is bent and formed in a substantially L-shape toward the main body of the electric device, and the bent piece. Since the connecting piece is formed by the extension piece that is connected and extends to the opposite side of the electrical equipment body, the appearance of the solder joint between the bent piece and the board surface of the printed circuit board from the opposite side of the electrical equipment body After inspection, the connection reliability with the printed circuit board can be further improved.

According to a third aspect of the present invention, in addition to the effect of the second aspect, since the extending piece is extended from both sides of the bending piece, the connection area with the substrate surface is increased to further connect. The reliability can be improved.

According to a fourth aspect of the present invention, in addition to the effect of the first aspect, the stress relief means is provided on the lead-out piece. Therefore, the stress relief means is provided on the board surfaces of the printed circuit board and the electric equipment body. The stress caused by the difference in the coefficient of thermal expansion in the along direction can be relaxed, and the solder cracks generated in the lead-out piece can be reduced.

According to a fifth aspect of the invention, in addition to the effect of the fourth aspect, the stress relaxation means is a through hole provided in the plate thickness direction of the lead-out piece. The side wall formed in 1 is bent to relieve the stress, and the stress relieving means can be easily formed by pressing.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a joined state with the above printed circuit board.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional example.

FIG. 5 is a cross-sectional view showing a joined state with the above-mentioned printed board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrical device main body 2 Printed circuit board 21 Board surface 3 Terminal 31 Lead-out piece 31b Through hole (stress relaxation means) 32 Connection piece 32a Bent piece 32b Extension piece

Claims (5)

[Claims] 1. A terminal of an electric device which is led out of the electric device main body and surface-mounted on a substrate surface of a printed circuit board, wherein the terminal is substantially perpendicular to the lead-out piece led out of the electric device main body. And a connection piece connected to the printed circuit board in a substantially T-shape, and a part or all of the connection piece is disposed between the electric device body and the printed circuit board. Equipment terminals. 2. The connecting piece includes a bent piece in which the lead-out piece is bent substantially in an L shape in one direction of an electric device body side.
The terminal of the electric device according to claim 1, wherein the terminal is formed of an extending piece connected to the bent piece and extending in the other direction. 3. The terminal of an electric device according to claim 2, wherein the extending piece is extended from both sides of the bending piece. 4. The stress relief means for relaxing stress caused by a difference in coefficient of thermal expansion between the printed circuit board and the electric device body is provided on the lead-out piece.
The terminal of the listed electrical equipment. 5. The terminal of an electric device according to claim 4, wherein the stress relieving means is a through hole provided in a plate thickness direction of the lead-out piece.