JPS609360B2 - How to connect the wiring board - Google Patents

Abstract

PURPOSE:To provide an electronic watch to enable electric connection to be conducted at a time by applying a flexible wiring board capable of compact wiring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting wiring boards used in so-called electronic watches that display the time using liquid crystals, light emitting elements, or the like.

The components of an electronic watch are a display panel that displays the time;
It consists of electronic components such as the G-MOSLS1, a crystal resonator, a resistor, a capacitor battery, a substrate on which these components are mounted, and a holding jig such as a screw.

These components are layered and fixed on a plurality of wiring boards. In such a case, it is necessary to electrically connect the plurality of wiring boards. Referring to FIG. 1, a conventional electrical connection between the wiring boards will be described. In FIG. 1, for example, in order to electrically connect the board 1 on which the C-MOSLS 16 has been reassembled and another board 2, through-hole wiring 3 is provided at the end of the board, and the board 1 and the board 2 are facing each other. hole 4 in position
The substrates 1 and 2 were electrically connected by inserting a metal supply tool 5 into the hole as shown in FIG. 1b, and fixing it by soldering.

In such a conventional connection method, as many metal picks 5 as required for electrical connection are required, and inserting and fixing the picks 5 into the holes 4 requires a As the number of clocks increases, the complexity becomes more complicated, making it difficult to assemble electronic watches and increasing costs.

Furthermore, the jig 6 and the hole 4 occupy a relatively large area of the wiring boards 1 and 2, and the number of electronic components that can be layered on the boards 1 and 2 is limited, resulting in an increase in the size of the entire electronic watch. There was an inconvenience. Furthermore, it is not possible to measure individual electrical characteristics of the wiring board during assembly, resulting in poor yield and a lack of reliability. SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a method for connecting wiring boards, which is used for electrical connections between wiring boards of electronic watches, and which completely eliminates the above-mentioned drawbacks. The structure of the wiring board used in the embodiment of the present invention will be explained in detail with reference to FIGS. 2, 3, and 4.

First, the shape of the board used for the connection will be explained with reference to FIG.
It has a structure in which steel foils 12 and 12'a or 12b are adhered to the surface of the flexible resin 11 and the thickness of the copper foils 12 and 12' is 10 to 10 mm. It can be bent freely. FIG. 3 shows the planar structure of the wiring board, which includes an area 13 where wiring boards compete, and an area 13 where electrical measurements are made after connection to one circuit board. The area where the target measurement is performed is at least wider than the area 13 in the pattern.

The copper foils 12, 12' on the flexible resin 11 are formed into a predetermined pattern by photoetching or chemical etching.

The patterned copper foil 12 is subjected to solder plating or gold plating to improve soldering work. The holes 14 provided in the flexible resin 11 are screw holes for fixing to the wiring board after soldering to increase mechanical strength. If the wiring density in the area 13 is formed by photoetching, the inside of the copper foil 12 portion can be 0.1 wire, and the distance between the steel foils can be 0.1 willow. An embodiment of the present invention will be described with reference to FIG.

'a}: An electronic circuit 22 such as C-MOSLSI is mounted on a wiring board 21 mainly made of epoxy or aluminum, and a group of terminals 23 for electrical connection to other wiring boards is mounted on the wiring board 21, which is mainly made of epoxy or aluminum. It is located at the end of the wiring board 21.

{b}: Wiring board 2 having flexibility as explained in FIG.
4 with the terminal group 23 of the wiring board 21,
Fix by soldering.

An outline of the soldering process will also be explained. If the copper foil portion of the board 21 or the wiring board 24 is previously treated with Au plating, Ni plating, solder plating, etc., the boards 24 are stacked on top of each other, and pressure is applied from above the wiring board 24 with a soldering iron. Can be used for soldering. Alternatively, there are other methods such as infrared soldering or hot air soldering, and any of these methods may be used. [c}: This step is not necessary if the soldering area is long, but in order to increase mechanical strength, the wiring board 24 is held down with a holding plate 25 and fixed with screws 26.

In this state, use the other end of the wiring board 24 to
The electrical characteristics of the MOSLS 122 can be measured.
Simply insert Ikebata into a commonly used connector, etc.
The spacing is wide enough to allow electrical measurements to be made. [d): Next, when the electrical measurement of 'c} is completed, it is cut leaving only the region 13.

'e': Lay another wiring board 27 on the other end of the cut, 'b'
Soldering is carried out using the method described above, and then further fixing is performed using a presser plate 25' and screws 26' during machining.

In this state, an electrical circuit is formed between the substrate 21 and the substrate 27. 'f': As shown in the figure, the substrate 21 and the substrate 27 are finally superimposed, and the substrate 2
The boards are fixed to each other with screws 30 via screws 9.

The holes 28, 28' are holes for screwing. In the state shown in the figure, the substrate 24 has a structure bent inward. Although the diagram shows terminals for electrical characteristics formed on the substrate 24, if the circuit is simple or unnecessary, only the area 13 may be used. Further, the holding plates 25, 25' or screws are not necessarily required as long as they have the necessary connection strength. FIG. 5 shows another example of the structure of the substrate 24, in which a plurality of portions corresponding to the regions 13 are provided.

In this configuration, the region B' is first used for connecting the wiring board, and once this is completed, the regions 13' and 13''' can be used one after another, resulting in a large economical benefit. It is the composition. As described above, according to the present invention, the following excellent effects can be achieved.

(2) According to the present invention, in the case of a small structure such as an electronic wristwatch, it is possible to increase the density of interconnection boards, so that many connections can be made in a small area.

As a result, the electronic watch itself can be made smaller, and the product image can be further enhanced. ■ Unlike conventional methods, jigs for the number of connections are not required, and not only can multiple connections be made with one component, but the cost of parts and production costs required for these connections can be significantly reduced, making it an inexpensive method. We can provide electronic clocks.

- Since it is possible to measure the electrical characteristics of a single wiring board, it is possible to improve the rough-cutting process or to significantly improve reliability.

■ Furthermore, the boards are connected with a bare wiring board,
Since it can be bent freely, it can be easily inspected and checked during assembly or when checking for defects.

[Brief explanation of drawings]

Fig. 1a is a perspective view of a state in which the boards are connected in a conventional electronic watch, Fig. 1b is a perspective view of a follower pick-up, and Figs. 3 is a plan view of the wiring board, FIGS. 4a and 4f are main part assembly process diagrams of an embodiment of the present invention, and FIG. 5 is another wiring used in the present invention. It is a top view of a board. 21... Wiring board, 22... Electronic circuit component, 23...
Terminal group, 24... Wiring board having maneuverability, 27...
・Other wiring boards. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 A first portion of the first region of a flexible wiring board having a first region for connecting between wiring boards and a second region for measuring electrical characteristics is connected to a first wiring. After connecting to the substrate and performing electrical measurements by the second region,
A method for connecting a wiring board, comprising separating and cutting the first and second regions, and connecting a second portion of the cut first region to a second wiring board.