JPH07307177A - Terminal connecting method - Google Patents

Abstract

PURPOSE:To provide a connecting method by which a substrate of an electronic part and a terminal for an external connection is surely done. CONSTITUTION:A frange part 35 having a projected part 37 of a terminal rivet 27 whose leg part 36 is pushed and fixed in a hole 34 of a terminal substrate 33 by pressure and a conductive land 30 having a center hole of an insulating substrate 24 of an electronic part are set on the opposite to each other while having a ring-like spring seat 38 between them. Then, the rear side of the terminal substrate 33 and a buffer material 21 in the rear side of the substrate 24 of the electronic part are connected by pinching them, so that the reliability of the terminal substrate which is easy to be cracked is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal connecting method for connecting a substrate of an electronic component and an external connecting terminal.

[0002]

2. Description of the Related Art A conventional method for connecting a substrate of an electronic component and a terminal for external connection will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 7 is a side sectional view of a rotary encoder.
When the operating shaft 1 is rotated, the movable contact 3 held by the rotating body 2 at the lower end of the operating shaft 1 slides on the comb-teeth fixed contact 5 formed on the contact substrate 4 to generate a pulse signal.

Then, this signal is led to the outside through the terminal 6 at the end of the contact substrate 4. Contact board 4 in this case
As shown in FIG. 8, a land 7 for connecting the comb-teeth fixed contact portion 5 and the terminal 6 and a wiring portion 8 for connecting between them are formed on a metal foil or the like on an insulating substrate such as a phenol resin laminated plate. As shown in FIGS. 8 and 9, the terminal 6 connected to the land 7 is formed by inserting the terminal (stud) 6 directly into the hole 9 of the contact substrate 4 and caulking it. It is common.

[0005]

In recent years, as electronic parts have become more precise and more sophisticated, ceramic substrates are used as the material of the contact substrate, and substrates for electronic components such as encoders with optical display, which will be described later, are used. Products in which a display element is bonded and mounted on the above have been made.

[0006] In such a product, if the terminal tacks are directly caulked to the substrate of the electronic component, the substrate may crack due to the impact during the caulking, and the electrical contact of the component mounted by bonding becomes unstable. was there.

[0007]

According to the present invention, in order to solve the above problems, a terminal stud is attached to another substrate in advance, and the connecting conductor portions of both the terminal-equipped substrate and the electronic component substrate are ring-shaped. The substrate of the electronic component is sandwiched between the terminal-attached substrate and the cushioning material on the back surface of the substrate of the electronic component so as to face each other via the conductive elastic body.

[0008]

Therefore, according to the present invention, the substrate of the electronic component is only sandwiched between the cushioning material on the back surface of the electronic component and the substrate with terminals. This prevents the occurrence of cracks and the like due to the caulking work.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The terminal connection method of the present invention will be described with reference to FIGS. 1 to 6 using a rotary encoder with an optical display as an example.

First, a rotary encoder with an optical display using the terminal connection method of the present invention will be described with reference to FIGS. In this encoder, as shown in the side sectional view of FIG. 1, an operating shaft 22 held by a bearing portion 21A of an upper case 21 is rotationally operated to rotate a reflecting plate 23 with a slit attached to a lower portion thereof. As a result, the slit reflection plate 23 intermittently reflects the light from the signal light emitting element 25 mounted on the intermediate insulating substrate 24 to generate a pulse signal in the light receiving element 26, which is a part of the terminal group 27. The signal transmitted from the circuit of the device to be used according to this pulse signal while being transmitted to the circuit of the device to be used (not shown) via the terminals (27A to 27D) of the terminal group (2).
7A to 27D) to the display light emitting elements 28A to 28N arranged in an arc shape on the outer periphery of the insulating substrate 24 to sequentially emit light, and the light is guided to the light guide hole 29 of the upper case 21. The number of generated pulses is displayed by showing through.

Further, the operating shaft 22 is rotated in the direction of rotation such that the two sets of light emitting element and light receiving element combinations 25A and 26A shown in FIG.
The circuit of the device used is configured to detect the phase difference (FIG. 3) between the pulse signals generated between (A phase) and 25B and 26B (B phase).

Here, the insulating substrate 24 is made of a phenol resin laminated plate, an epoxy resin laminated plate, or the like, as shown in FIG.
As shown in (A) and (B), the signal light emitting elements 25A and 25B, the light receiving elements 26A and 26B, and a large number of display light emitting elements 28A to 28N are bonded and mounted on the metal foil layer on the upper surface. Has a large number of conductor lands with a central hole 30A to N for connecting the element to the external circuit at both ends of its back surface, and conductor wirings 31A to N of a metal foil are provided between each element and these lands. And it is conducted by through hole plating 32A-N.

Further, 33 is a terminal board made of molded resin, and in the holes 34A to N at both ends thereof, as shown in FIG. The terminal groups 27A to 27N are formed by press-fitting the lands 30A to 30N with a central hole of the insulating substrate 24 at the same pitch.

When the terminal boards 33 with terminal groups 27A to 27N and the insulating board 24 are superposed on each other and assembled into the encoder of FIG. 1, the projections 37 of the terminal tacks 27 are formed into a ring shape made of a thin metal plate. Spring washer (conductive elastic body) 3
After inserting 8, the protrusion 37 of each terminal tack 27 is inserted into the central hole of each conductor land 30, and the washer 38 is sandwiched between the flanges 35A-N of the terminal tacks 27A-N of the terminal board 33 and the insulating board 24. With the conductor lands 30A to 30N facing each other, the front end 41 of the leg portion of the mounting bracket 40 is placed between the back surface of the terminal board 33 and the top case 21 (buffer material) in contact with the back surface of the insulating board 24.
It is sandwiched by bending. This allows
All conductor lands 30A to 30N of the insulating substrate 24 are the terminal substrate 33.
All the terminal studs 27A to 27N are securely electrically connected to the leg portions 36A to 36N.

FIGS. 5 and 6 show all the terminal tacks 2 of the terminal board 27 with the terminal groups 27A to 27N in the above combination work.
7 shows a method of reliably inserting the ring-shaped spring washers 38A-N into the projections 37A-N of 7A-N in a short time.

That is, when the spring washers 38 are pressed from a thin metal plate, the washers 38A to 38N are not individually separated, and a predetermined number of the terminal studs 27A to 27N arranged on the terminal board 33 are arranged at the same pitch. Each of the spring washers 38A-N is connected to the connecting band 43 via the arm portions 42A-N, and the connected spring washers 38A-N are collectively inserted into all the protrusions 37A-N of the terminal tacks 27A-N. Then, the mounting bracket 40 is combined with the insulating substrate 24 and the upper case 21.
After being sandwiched and fixed by the leg portions 41, the arm portions 42A to 42N of the spring washers are bent and cut by the half cut portion 44 located outside the end portion of the terminal board 33, as shown by the arrow in FIG. The spring washers 38A to 38N are electrically independent.

In the above embodiments, the ring-shaped conductive elastic body is the ring-shaped spring washer, but it goes without saying that it may be a ring made of conductive rubber.

[0018]

As is apparent from the above embodiment, the terminal connecting method of the present invention has a conductive spring washer sandwiched between the connecting conductor portions of both the electronic component board and the board to which the terminal studs are attached in advance. In this case, both boards are connected by narrowing the pressure from the back side, and since a reinforcing material is interposed on the back side of the board for electronic parts, even if they are crimped and connected, a large impact is applied to the board for electronic parts. There is no such thing.

Therefore, even if the substrate of the electronic component is a ceramic substrate or an element is bonded and mounted on the substrate of the electronic component, cracks may occur in the substrate or the electrical connection may become unstable. There is no such thing.

[Brief description of drawings]

FIG. 1 is a side sectional view of a rotary encoder with an optical display which is an embodiment of a terminal connecting method of the present invention.

FIG. 2A is a plan view of an insulating substrate which is the main part of the same. FIG. 2B is a cross-sectional view taken along the line CC ′ of FIG.

FIG. 3 is a pulse signal waveform diagram of the same.

FIG. 4 is a perspective view illustrating a method of combining the terminal board and the terminal tack.

FIG. 5 is a perspective view illustrating a method of combining the terminal tack and the spring washer.

FIG. 6 is an enlarged sectional view of an essential part of a connecting portion between the terminal board and the insulating board.

FIG. 7 is a side sectional view of a conventional rotary encoder.

FIG. 8 is a perspective view for explaining a method of combining the contact board and the terminal studs, which is the main part of the same.

FIG. 9 is a cross-sectional view of a terminal stud mounting portion of the contact board, which is the main part of the same.

[Explanation of symbols]

 21 Upper Case (Cushioning Material) 24 Insulation Board 27 Terminal Tack 30 Land with Central Hole 33 Terminal Board 35 Connecting Collar 36 Leg (37) Center (Protrusion) 38 Ring Spring Washer 42 Arm 43 Connecting Band 44 Half Cut

Claims (2)

[Claims] 1. A terminal board, in which legs of a terminal stud having a connecting brim portion in the middle are press-fitted and fixed at a predetermined interval, and a central portion for inserting a tip projection of the terminal board, which faces the flange portion of each terminal stud. Each of the terminal studs includes an insulating substrate having a land with holes, and a plurality of substantially ring-shaped conductive elastic bodies inserted in the protrusions of the terminal studs between the flanges of the terminal studs and the lands of the insulating substrate. The terminal connecting method in which the collar portion and the lands of the insulating substrate are pressed into contact with each other by a means for narrowing the space between the back surface of the terminal substrate and the buffer material on the back surface of the insulating substrate. 2. The conductive elastic body is used as a spring washer, and all ring-shaped spring washers, a connecting band located outside the end of the terminal board, and an arm portion connecting these are formed from an integral thin metal plate. The half-cut portion provided outside the terminal board end portion of each arm portion is bent and cut after the entire ring-shaped washer portion is compressed by the flange portion of the terminal tack and the land portion of the insulating substrate. Terminal connection method.