Key switch devices with indicator lamp means

Details Key switch devices with indicator lamp means Key switch devices with indicator lamp means

1984-03-21

1985-07-23

Shepperd, John W.

Electricity: circuit makers and breakers

Electric switch details

Indicators

200317, H01H 916

Patent

active

045310343

ABSTRACT:
A key switch device having a plurality of keys and a plurality of light emission diode tips for indicating the keys operated, respectively. The diode tips are mounted and electrically connected to metal patterns formed on the same surface of a printed circuit on which fixed contact pairs are formed. In order to cover the diode tips, a transparent plate is overlaid on the printed circuit board and has lamp cover portions. The transparent plate is also provided with small upwardly opening funnel shaped slits at positions between adjacent lamp cover portions, whereby light from one light emission diode is prevented from leaking to a lamp cover corresponding to the adjacent light emission diode.

REFERENCES:
patent: 3811025 (1974-05-01), Bach
patent: 4376879 (1983-03-01), Nagata et al.

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