JPS6012304Y2 - Substrate for electronic components - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a board for electronic parts used in electric typewriters and the like.

PRIOR ART Conventionally, in an electric typewriter in which a type selection operation is performed by an electrical push signal based on the depression of an operation key, a single wiring board is provided below the arrangement of a group of operation keys. On the board were mounted contacts corresponding to each operation key and electronic components such as semiconductors that made up the control circuit.

Therefore, since it is sufficient to provide the same number of contacts as the number of operation keys, for example, it is necessary to use a board with a large area so as to include the entire group of operation keys.

However, the materials generally used for wiring boards in the past are quite expensive, and using them to make a large board increases costs.

For this purpose, inexpensive materials may be used, but at present, the use of these materials causes a decrease in reliability in the control circuit, and expensive materials have no choice but to be used throughout.

Purpose of the invention The purpose of this invention is to provide a substrate for electronic components that can solve the above-mentioned problems and achieve a significant cost reduction, as well as protect electronic components that generate a large amount of heat.

EXAMPLE Hereinafter, an example in which this invention was embodied as a board for electronic components in an electric typewriter will be explained based on the drawings.
Board 1 for a large keyboard fixed below the array group of
An inexpensive one made of cardboard impregnated with phenolic resin is used, and on its top surface, contacts 2 (only three are shown) corresponding to each operation key are printed.

A small control printed circuit board 3 disposed in the vicinity of the keyboard substrate 1 on the same plane as the keyboard substrate 1 is made of glass fiber-containing epoxy resin having excellent characteristics as a printed circuit board.

Further, the control printed circuit board 3 and the keyboard circuit board 1 are mechanically connected to each other by a single rigid metal plate 4 using screws 5 and the like and are integrated.

On the control board 3, a semiconductor 6 etc. (only one is shown) that constitutes a control circuit is disposed, and on the metal plate 4, a semiconductor 7 that generates a large amount of heat and constitutes a side control circuit together with the semiconductor 6 is disposed. is located.

The electronic circuit on the keyboard board 1 and the electronic circuit on the control board 3 are connected by a connecting wire 8 passing on the metal plate 4.

Effects of the Invention As described above, the electronic component board of this invention mechanically connects and integrates the two printed wiring boards 1 and 3 with one metal plate 4, and also connects the electronic components 2. 6. By arranging the component 7 which generates a large amount of heat out of the components 7 on the metal plate 4, excellent effects as listed below can be achieved.

1. It is possible to significantly reduce costs by using expensive materials only for the small board 3 on which the control circuit is installed, and by using inexpensive materials for the large board 1, without using expensive materials for the entire board. Can be done.

2. Since the electronic component 7 that generates a large amount of heat is arranged on the metal plate 4, the heat generated is efficiently dissipated, and the deterioration of the characteristics due to overheating of the electronic component 7 and the adverse effects on the other electronic components 2 and 6 are prevented. Can be done.

3. Since the metal plate 4 is connected and integrated with the substrates 1 and 3, the metal plate 4 allows the substrates 1 and 3 to be controlled based on heat, humidity, etc.
In particular, distortion of the inexpensive substrate 1 can be prevented.

4. Since both the substrates 1 and 3 are connected and integrated by the metal plate 4, it can be easily assembled to the main body of a typewriter or the like.

It goes without saying that this invention is not limited to the above-mentioned embodiment, and can be embodied as a board for electronic components of devices other than electric typewriters.

[Brief explanation of drawings]

The figure is a plan view of a board for electronic components embodying this idea. Keyboard board 1, contacts 2, control board 3,
Metal plate 4, semiconductor 6,7°

Claims (1)

[Scope of claim for utility model registration] Two printed wiring boards 1 and 3 on which electronic components 2, 6, 7, etc. are mounted are arranged in one plane, and the inner boards 1 and 3 are covered with one metal plate 4. In addition to mechanically connecting and integrating the electronic components to be mounted on the inner substrates 1 and 3, the component 7 that generates a large amount of heat is placed on the metal plate 4 to enhance the heat dissipation effect of the component. A substrate for electronic components featuring: