Hard base key unit

Details Hard base key unit Hard base key unit

2007-07-31

2007-07-31

Lewis, David L. (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Including keyboard

C345S156000, C341S022000

Reexamination Certificate

active

10209286

ABSTRACT:
A first object is to provide a key unit capable of preventing a problem that a key top gets under a key window frame of a casing of a movable telephone or the like during key pushing down, and capable of preventing floating of the key top and interferences with movements between keys in a narrow-pitch key board which cannot employ a key window frame. A second object is to provide a key unit of a novel thin structure, capable of eliminating a dual structure where an light guiding plate is superposed as a separate component. A hard base key unit comprises a hard base made of a hard resin plate and having a through hole on a plane thereof, a key pad made of a rubber-like elastic body film to cover the through hole1of the hard base, a switch thrusting projection formed integrally with the key pad on a plane of the key pad facing the inside of the through hole, and a key top made of a hard resin and provided at a position corresponding to the switch thrusting projection on the other plane of the key pad.

REFERENCES:
patent: 5900829 (1999-05-01), Gardner et al.
patent: 6498614 (2002-12-01), Amari et al.
patent: 6576856 (2003-06-01), Masaru et al.
patent: 6642920 (2003-11-01), Osawa et al.
patent: 6677545 (2004-01-01), Kenmochi
patent: 6876837 (2005-04-01), Kuroshima et al.
patent: 2001/0014152 (2001-08-01), Yang

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