JPS6360512B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a simple method for manufacturing a printed wiring board having, for example, a connector integrated therein.

Conventionally, when drawing out lead wires from a printed wiring board, a connector as shown in FIG. 1 has been used. That is, the connector terminal portion 2 is fixed to the hard printed wiring board 1 by soldering or the like, and the socket portion 3 is inserted into the connector terminal portion 2 to establish an electrical connection between one printed wiring board and another board or component. It was composed of

However, this type of structure has poor workability and high cost because the connector terminals must be attached to the printed wiring board one by one and the unit cost of the connector terminals is relatively high.

Therefore, the present invention provides a simple method for manufacturing a printed wiring board that eliminates such conventional drawbacks, and one embodiment thereof will be described below with reference to FIG. 2 and subsequent drawings.

Figure 2 shows a flexible printed wiring board manufactured by the manufacturing method of the present invention, and 11 is its base made of polyimide, glass epoxy, polyester, etc.
It is made of a thin flexible sheet approximately 0.3mm thick.
12 is a conductive foil of the board; 13 is a synthetic resin molded body provided so as to protrude from the base side of the board to the surface of the conductive foil; this molded body 13 forms a part of the printed wiring board, that is, a U-shape; shaped slit 1
The tongue portion 15 formed by 4 is bent. The molded body 13 is made of a material that can be melted and bonded to the base 11 of the printed wiring board, such as ABS resin or the same material as the base 11,
It is integrally fixed to the base 11.

In FIG. 3, the tongue portion 15 of the printed wiring board is used as a connector terminal portion, and this board is lined with a metal plate 16 as shown in FIG. The metal plate 16 has a smaller heat shrinkage rate than the base 11 and the molded resin, and the molded body 13 passes through the runner 17 and the hole in the metal plate 16, which are continuously provided, to connect the runner 17 and the base of the flexible printed wiring board. It is prevented from coming off by a connecting part 18 that connects 11. Reference numeral 19 designates a socket portion, and when this portion is attached to the molded body 13, the contact 20 in the socket portion 17 comes into contact with the conductive foil 15 on the tongue piece 15, as shown in FIG. Line 21 is electrically connected.

Next, regarding the method for manufacturing the printed wiring board mentioned above,
The manufacturing method of the substrate shown in FIG. 2 will be representatively explained with reference to FIG. 6. FIG. 6A shows a flexible printed wiring board on which a conductive foil 12 forming a circuit is printed flat on a flat base 11. Further, a tongue piece 15 is formed in a part of the substrate by a U-shaped slit 14. 22 is a first mold having a recess 23 for forming the molded body 13; 24 is a recess 2 for storing the printed wiring board;
5. A second mold having a recess 26 corresponding to the recess 23 of the first mold 22 and a resin injection port 27 into the recess 26. Then, as shown in FIG. 6A, the flexible printed wiring board shown in FIG.
correspond to the recess 23, and the first and second
The molds 22 and 24 are sandwiched and preheated. This heated state is shown in FIG. 6C. Next, the second
The resin is injected from the injection port 27 of the mold 24 into the recess 2.
6, the injection pressure is applied to the tongue piece 15,
It is bent and deformed until it is pressed against the peripheral wall of the recess 23. Furthermore, the base 11 of the substrate and the molded body 1
The resin No. 3 reacts, and the molded body 13 is fixed to the base 11. Thereafter, by cooling and dividing the molds 22 and 24, the printed wiring board shown in FIG. 2 is completed.

In this way, the molded body 13 is formed at the same time as the tongue piece of the flexible printed wiring board is bent by the pressure applied when the molding resin is injected, so it is possible to produce a three-dimensional printed wiring board extremely easily. I can do it.

In addition, in the embodiment shown in FIGS. 3 to 5, the metal plate 1
For example, if 6 is a mechanism board of a tape recorder, a printed wiring board and a connector can be formed on this mechanism board at the same time. Further, although not shown, parts such as a base and a shaft can be formed on the mechanism board at the same time as the molded body 13 is formed during resin molding.

Further, in the above embodiment, the tongue piece formed by a slit on the printed wiring board is bent using a molded body, but this may be done by bending the end portion of the printed wiring board.

As explained above, according to the method for manufacturing a printed wiring board of the present invention, a part of the board bent by the molded body can be used as a connector, instead of preparing a separate connector as in the past. Assembling it onto the board eliminates the need for all the troublesome work. In addition, the resin injection pressure into the mold can be used to simultaneously bend the board and form the molded body. Moreover, the molded body is made of a resin material that can be melted and bonded to the base of the flexible printed circuit board. Therefore, the base of the substrate can be bonded and fixed to the molded body during molding. As a result, manufacturing costs can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a printed wiring board equipped with a conventional connector, FIG. 2 is a partially cross-sectional perspective view of a printed wiring board manufactured by the manufacturing method of the present invention, and FIG.
The figure is a perspective view of a printed wiring board showing another example.
FIG. 4 is a sectional view of the same board, FIG. 5 is a sectional view showing a state in which a socket is attached to the same board, and FIGS. This is a diagram for DESCRIPTION OF SYMBOLS 11... Base, 12... Conductive foil, 13... Molded body, 22... First mold, 24... Second mold, 27... Resin injection port.

Claims (1)

[Claims] 1 A flexible printed wiring board is placed in a first mold having a recess for forming a molded body, and a second mold having a molding material injection port.
A resin that can be melted and bonded to the base of the substrate, which is injected from the injection port of the second mold, is held between the molds so that the conductive foil surface of the substrate corresponds to the recess of the first mold. The substrate is bent by the injection pressure of the material, and the molded body is formed using the first and second molds so as to protrude from the base side of the substrate to the conductive foil side and intersect with the main surface of the substrate. A method of manufacturing a printed wiring board, characterized in that the conductive foil of the board bent and fixed is used as a connector terminal part.