JPS6031271Y2 - Board connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a substrate connecting device that electrically and mechanically connects two flexible substrates to each other.

In recent years, in order to make electrical equipment smaller, thinner, and cheaper, the use of thin flexible circuit boards made of synthetic resin has become popular. The method used is to solder the corresponding terminals of both together, but the reality is that soldering a large number of terminals individually is inefficient and increases the cost of the product. In order to improve this point, some structures have been seen in which the terminals of both boards are adhered using a so-called conductive adhesive, but such structures require sufficient pressure contact and require a large number of terminals. It was necessary to create a mechanism that applied pressure evenly between the parts, making it difficult to obtain a highly reliable connection.

Under such circumstances, the present invention aims to eliminate the drawbacks of the conventional art and provide a highly reliable and inexpensive connection device that only requires simple installation work.

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

Figure 1 shows the disassembly and connection of the present invention applied to an electronic desktop calculator. In the figure, the upper and lower lids 1 and 2 are made of thin metal sheet material, and constitute a box that houses electronic components inside. ing.

The upper lid body 1 has through holes 1a and lb formed therein for the key buttons 3 and the display body 4, respectively, and a frame member 5 made of synthetic resin is arranged below the through holes 1a and lb.

The frame member 5 has a through hole 5a that serves as a guide for the key button 3, a groove 5b into which a rod-shaped elastic body 6 (described later) is fitted, and a display body 4.
A through hole 5c for supporting the semiconductor element 7 and a through hole 5d for a semiconductor element 7 to be described later are formed, respectively.

A large number of key buttons 3 are attached from below the frame member 5 upwardly from below the through-holes 5a, so that their heads 3a cannot be removed from the outside through the through-holes 1a of the upper lid body 1 during assembly. become exposed to

As shown in FIG. 2, below these key buttons 3, a first flexible substrate 8 for configuring a keyboard switch is arranged by being bent into an upper part 8a and a lower part 8b. , 8b, a spacer member 9 is interposed between them.

The first flexible substrate 8 is made of a synthetic resin material, and its upper portion 8a has a dome-shaped portion 8c protruding upwardly formed at a position facing each key button 3, and each inner surface (lower surface ) are printed with movable electrodes 10, and fixed electrodes 11 facing the movable electrodes 10 are also printed on the upper surface of the lower portion 8b.

These electrodes 10, 11 come into contact when the dome-shaped portion 8C is bent downward based on the pressing operation of the corresponding key button 3.

These electrodes 10, 11 are both connected in a predetermined relationship to a conductive pattern 12 arranged in parallel at one end of the upper portion 8a, and the conductive pattern 12 and the connection pattern are connected to each electrode 10. At the same time as .11, printed electrodes were formed using conductive ink.

The spacer member 9 is made of such a first flexible substrate 8.
The purpose is to prevent unnecessary contact between the upper part 8a and the lower part 8b, and through holes 9a are formed only at positions where each movable electrode 10 and fixed electrode 11 face each other.

The second flexible substrate 13 connected to the upper portion 8a of the first flexible substrate 8 is made of a synthetic resin material, and has copper on its surface to which the semiconductor element 7, which is an arithmetic control element, is soldered. A foil circuit is formed, at one end thereof a conductive pattern 14 corresponding to the conductive pattern 12 on the first flexible substrate 8 is formed, and at the opposite end thereof a conductive pattern 14 is formed which is connected to the display body 4. A conductive pattern 15 is formed.

The connection between the conductive pattern 15 and the display body 4 is made through the upper and lower lid bodies 1 and 2.
When assembled, they are pressed and supported from below by an elastic body 16.

Such a first. The second flexible substrate 8.13 is connected as shown in FIGS. 3 and 4.

That is, first, as shown in FIG. 3, the conductive pattern 12 formed on the upper portion 8a of the first flexible substrate 8 and the conductive pattern 14 on the second flexible substrate 13 are made to face each other, and the opposing portion is positioned above the groove 5b of the frame member 5, and the rod-shaped elastic body 6 is fitted into the groove 5b from above.

The state after the mating work is as shown in Figure 4.
Due to the elastic action of the rod-shaped elastic body 6, the first and second flexible substrates 8, 13 are held in the groove 5b with their respective conductive patterns in contact with each other, and the contact state also ensures proper electrical connection. enough to maintain it.

Incidentally, since such a connection structure is sandwiched between the upper and lower lid bodies 1 and 2, the rod-shaped elastic body 6 does not protrude outside the groove 5b due to vibration, and the groove 5b and the rod-shaped elastic body 6 do not protrude outside the groove 5b.
The length is longer than the width of the connecting portion of the first and second flexible substrates 8 and 13.

Such a substrate connection device according to the present invention includes a substrate holder,
That is, when the rod-shaped elastic body is fitted into the concave groove of the frame body, a portion where the opposing conductive patterns of the two flexible substrates come into contact is interposed between them, and the elastic force of the rod-shaped elastic body provides a suitable electrical and mechanical The assembly process is extremely simple and highly reliable, and the materials required are not particularly expensive, significantly reducing the overall manufacturing cost. The practical effects of this invention are great.

[Brief explanation of the drawing]

Fig. 1 is an exploded sectional view of an electronic desktop calculator showing an embodiment of the present invention, Fig. 2 is an exploded perspective view of a part of the calculator, Fig. 3 is a sectional view of main parts showing the state before assembly, and Fig. Figure 4 is a sectional view of the main parts after assembly. In the figure, 5 is a substrate holder, 5b is a groove thereof, 6 is a rod-shaped elastic body, 8 is a first flexible substrate, and 13 is a second flexible substrate.

Claims (1)

[Claims for Utility Model Registration] A first flexible substrate on which a large number of conductive patterns are arranged in parallel on one side surface, and a conductive pattern opposite to each conductive pattern on the first flexible substrate is arranged in a concentrated manner. a second flexible substrate arranged in parallel with the two substrates; a substrate holder in which a groove having a length equal to or longer than the width of the juxtaposed conductive patterns of both substrates is formed; and a rod-shaped elastic substrate fitted in the groove. The rod-shaped elastic body is fitted into the concave groove and held through the contact portion of the two substrates which are overlapped so that the opposing conductive patterns are in contact with each other, thereby creating a connection between the circumferential substrates. A board connecting device characterized by being electrically and mechanically connected.