JPH0212657Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switch board that is less warped thermally, over time, and physically.

FIG. 1 shows a conventional flat type switch board, in which a plurality of push-operated switches 3 are mounted on a printed wiring board 1 along with electrical components 2 such as semiconductor components, and the board is relatively long. Reference numeral 4 denotes a container-shaped switch board housing having a switch operating insert 5 for operating the switch 3, and is connected to the printed wiring board 1 with screws 6. Reference numeral 7 denotes a slightly stretchable printing sheet provided on the casing 4, which displays button positions 8 corresponding to the switch operation inserts 5, and makes the lamp part 9 of the display element transparent. Reference numeral 10 denotes a metal frame which is connected to the housing 4 using the screws 6 and the holes 12 and 13 so as to be located on the lower surface side of the printed wiring board 1 via an insulating pusher 11, and this unit (switch board) It is used to prevent warping.

When preventing warpage with this configuration, the following drawbacks occurred. One is that the entire unit has become thicker, making it difficult to keep up with the recent miniaturization of set equipment.The other is that to prevent the switch board casing from warping, it is necessary to use highly rigid materials, shapes, and especially thickness. This requires a metal frame, making it heavy and making it difficult to reduce the weight of the set.

The present invention has been devised to eliminate the above-mentioned drawbacks of the prior art, and one embodiment thereof will be described below with reference to FIG. 2, with the same numbers assigned to the same parts as above.

This embodiment of the present invention differs from FIG. At least a flat part is provided around the two so that the switch board housing 4 comes into contact with the above, and this flat part is sandwiched between the two, and the bent 15 of the sheet metal is turned inward to form an angled shape. The bent metal frame 14 is included in the inner surface of the container-shaped casing 4. In addition, in Fig. 2, 16 is a mounting part with a mounting hole for mounting this unit to a set, etc.;
7 is a hole for the screw 6 formed in the metal frame 14.

According to the configuration of the present invention, a space for providing a metal frame is unnecessary, which greatly contributes to miniaturization. Furthermore, due to its temperature resistance characteristics, for example, when the temperature rises, the elongation of the metal frame 14 is extremely small as shown in FIG.
Since the casing 4 tends to warp in the direction A, and the printed wiring board 1 tends to warp in the opposite direction B,
The forces cancel out and become relatively small, resulting in a less rigid metal frame, which saves size and weight of the unit. Furthermore, the attachment portion to the set etc. can also be made of metal, which is useful for improving the attachment strength.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a conventional switch board, Fig. 2 is an exploded perspective view of an embodiment of the switch board according to the present invention, and Fig. 3 is an exploded perspective view for explaining the temperature resistance characteristics of the switch board. It is a schematic front view. 1...Printed wiring board, 2...Electrical component, 3
...Push operation switch, 4...Switch board housing, 14...Metal frame.

Claims (1)

[Claims for Utility Model Registration] (1) A printed wiring board, electrical components including a plurality of push operation switches mounted on this board, and a container-shaped container that is combined with the printed wiring board to form a switch operation surface. A switch board housing is arranged between the printed wiring board and the switch board housing at least around the two, the printed wiring board is in contact with one surface of the switch board housing, and the switch board housing is in contact with the other surface of the switch board housing. A switch board consisting of a flat surface part and a metal frame in which the flat part is held between the two parts. (2) The switch board according to claim 1 of the utility model registration claim, which uses a metal frame bent into an angular shape.