JPS6051236B2 - Electrical connection method of electrical wiring circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for electrically connecting electrical wiring circuit boards called printed boards, wiring boards, etc., and in particular to a method for electrically connecting electrical wiring circuit boards such as cameras, etc., with a small space in which to place an electrical wiring circuit board, and To provide an electrical connection method suitable for connecting an electrical wiring circuit board made of a flexible material and arranged so as to be bent or bent.

Conventionally, electrical connections between conductive pattern parts of electrical wiring circuit boards were made using gold-plated connectors or by directly joining the conductive pattern parts of the electrical wiring circuit boards with solder, but these methods were expensive. There were shortcomings in reliability, such as connection failures due to heat, vibration, shock, and changes in temperature and humidity.

In addition, for devices such as cameras, small electronic computers, calculators, and small electrical equipment that have few spaces for arranging elements, connections, and circuit boards that make up electrical circuits, miniaturization of circuit elements and electrical wiring circuit boards are required. It is necessary to wire the conductive patterns thinly and densely in a so-called high-density manner, but for this purpose, conventional connection methods pose difficulties in assembly work and manufacturing process work. The present invention eliminates the above-mentioned conventional drawbacks and provides an electrical connection method that is highly reliable and improves work efficiency. Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 shows an example in which an electric wiring circuit board is arranged in the penta-portion of the camera, where 1 is the upper cover of the camera, 2 is the camera body, 3 is the penta-prism, and 4 is the Guha surface on the penta-prism 3. This circuit board 4 is a flexible first electrical wiring circuit board arranged along the etc.) and are connected to a conductive pattern (not shown) by soldering or the like.

5 is a second electrical wiring circuit board to be electrically connected to the first electrical wiring 7 circuit board 4;
, is connected to the circuit board 4, and the other end is bent along the camera body and placed in a suitable space at the front of the camera body.

As shown in FIG. 1, the present invention is suitable for electrically connecting the conductive pattern portion of the inclined surface of the first electric wiring circuit board 4 with the conductive pattern portion of the second electric wiring circuit board 5. It is.

This electrical connection and method will be explained with reference to enlarged views in FIGS. 2 and 3. In FIG. 2, the electric wiring circuit board 5 of FIG. 1 has a conductive pattern 5a made by a known method such as printing a conductive material such as a copper material on a substrate, and a protective film 6 on the conductive pattern 5a. It is covered with

Conductive members such as lead wires and covered wires 7 are fixed to the ends of the circuit board 5 using high melting point solder 8 or spot welding. The other end of the conductive member 7 is bent 7a as shown. 1st
The electrical wiring circuit board 4 has a conductive pattern portion 4a made of a conductive material on the board by a known method such as printing, and the tip of the conductive pattern 4a has a circular or elliptical shape so that the solder adheres well. The tip pattern portion 4b has a through hole 4c into which the bent portion 7a of the conductive member 7 can be inserted.

10 is a protective film for protecting the conductive pattern portion 4a of the first electric wiring circuit board 4, and this protective film 10 is for exposing the tip pattern portion 4b of the conductive pattern 4a of the first electric wiring circuit board 4. An opening 10a is provided in the opening 10a.

Conductive pattern portions 4a, 5 of first and second electrical wiring circuit boards
In order to connect the conductive member 7 with the conductive member 7, one end of the conductive member 7 is first soldered to the conductive pattern portion 5a of the second electrical wiring circuit board using a high melting point solder.

Next, the bent portion 7a of the conductive member 7 is inserted into the through hole 4c of the first electric wiring circuit board 4, and fixed as shown in FIG. 3 with solder 11 having a lower melting point than the high melting point solder. . As described above, in the present invention, one end of the conductive member 7 is fixed to the conductive pattern portion 5a of the second electrical wiring circuit board 5 with high point 3 solder 8, and the bent portion 7a of the conductive member 7 is fixed to the conductive pattern portion 5a of the second electrical wiring circuit board 5. It is inserted into the through hole 4c of the electric wiring circuit board 4 and fixed with low melting point solder 11.

According to the present invention, in the first step, the second electric wiring circuit board 5 and the conductive member 7 are fixed, and in the next step, the conductive member and the first electric wiring circuit board are connected. Handa 8 and 1
1 have different melting points, the solder between the second electrical wiring circuit board and the conductive member 7 will not melt during the second step and will not be able to be firmly bonded, and the position of the conductive pattern portion 5a and the conductive member 7 will not slip. . In the explanation of FIGS. 2 and 3 above, an example was explained in which one end of the conductive member 7 was bent with a rib and a through hole was provided in the conductive pattern portion 4b of the first electrical wiring circuit board. Although it is not necessary to bend the conductive member and insert it into the through hole 4c, it is necessary to accurately align the tip of the conductive member with the tip pattern portion 4b of the conductive pattern portion 4a, or to place it on an automatic conveyor and transport it to the automatic soldering process. This is an extremely excellent means and method for preventing misalignment due to vibrations, etc., and inappropriate soldering such as solder bridging (short circuit), temporary soldering, etc. Also, the entire tip of the conductive member is bent. It is not necessary, and it is sufficient to bend an appropriate number of pieces at appropriate places and insert them into the through hole 4c. As shown in the embodiments of the present invention, even when the first electrical wiring circuit board 4 needs to be mounted at an angle, it can be electrically connected to the second electrical wiring circuit board 5 via the conductive member 7. The reliability of the electrical connection can be improved because no physically unreasonable stress or strain is applied to the solder at the connection part.

As a high melting point solder, it is necessary to consider the soldering temperature and the thermal effect on circuit elements, and the melting point is, for example, 300°C.
Before and after, solder with a low melting point of around 90°C can be used.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a camera for explaining the arrangement of an electric wiring circuit board when the present invention is applied to a camera. FIG. 2 is a process explanatory diagram of an embodiment of the present invention. FIG. 3 is an explanatory diagram showing the connection of the electric wiring circuit board. 4, 5...Electric wiring circuit board, 7...Conducting member.

Claims (1)

[Scope of Claims] 1. A conductive pattern portion of a first electric wiring circuit and a conductive pattern portion of a second electric wiring circuit board adjacent to the conductive pattern portion of the first electric wiring circuit board.
and a second electrical wiring circuit board, in which one end of the electrical wiring member is connected to a conductive pattern portion of one of the first and second electrical wiring circuit boards using high melting point solder or fixed by welding means, and connecting the other end of the conductive member to the other conductive pattern portion of the first and second electric wiring circuit boards with the high melting point solder or a low melting point solder lower than the melting point of the welding means. An electrical connection method for an electrical wiring circuit board, characterized in that: 2. In the electrical connection method as set forth in claim 1, a penetration for inserting the tip of the conductive member into part or all of the other conductive pattern portion of the first and second electric wiring circuit boards. A method for electrically connecting an electrical wiring circuit board, characterized in that a hole is provided.