Key input device and portable telephone incorporating same

Details Key input device and portable telephone incorporating same Key input device and portable telephone incorporating same

H - Electricity

01

H

H01H 23/02 (2006.01) G06F 3/02 (2006.01) G06F 3/033 (2006.01) H01H 13/70 (2006.01) H01H 23/12 (2006.01) H04M 1/23 (2006.01) H01H 25/04 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2343425

A key input device embodying the present invention comprises a seesaw switch unit (4) installed on a sheet (41), and a key rubber (8) installed on the sheet (41) covering the seesaw switch unit (4). A seesaw key (10) is arranged on the surface of the key rubber (8) for depressing the seesaw switch unit (4). The seesaw switch unit (4) comprises a base plate, a dome sheet provided on a base plate having a plurality of dome portions, and a pivotally movable member 6 provided over the dome sheet to depress selectively each dome portion. The depression of the pivotally movable member 6 causes a dome portion to be elastically restorably invertable, to have a contact terminal formed on an inner surface of the dome portion into contact with a contact electrode formed on a surface of the base plate, closing contacts. With the key input device, the device can be made thinner, and the complete waterproof can be achieved with reduced number of components.

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