Keyboard unit and key switch

Details Keyboard unit and key switch Keyboard unit and key switch

1997-08-19

1999-06-22

Friedhofer, Michael A.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200517, 200344, H01H 1370

Patent

active

059144688

ABSTRACT:
A keyboard unit having a base plate, and a plurality of key switches provided on the base plate. Each of the key switches has an electric contact provided within a membrane sheet on the base plate, an elastic dome portion formed on the base plate so as to cover the electric contact, a bearing portion provided on base plate, and a key cap having a support shaft which engages the bearing portion, and an engaging portion which engages the dome portion. When the key cap is depressed, the dome portion is elastically deformed so that an inner surface of the dome portion presses against the electric contact, and when the key cap is not depressed, deformation of the dome portion is removed so that the inner surface of the dome portion is separated from the electric contact and the key cap is pushed up by the dome portion.

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