04343975 is referenced by 69 patents and cites 8 patents.

The invention provides a novel key board switch unit with illumination in the pushing areas, e.g. push buttons. Different from conventional ones, the pushing areas in the inventive unit are illuminated indirectly with the light emitted from a lamp positioned at a remote place not directly visible from above the pushing areas and, instead, an optical conductor member made of a transparent material is provided between the lamp and the pushing areas to be illuminated. The inventive key board switch unit can be very compactly designed despite the sufficiently high but not glaring intensity of illumination facilitating the operation of the switches even in a dark place.

Title
Key board switch unit with illumination
Application Number
6/211781
Publication Number
4343975
Application Date
December 1, 1980
Publication Date
August 10, 1982
Inventor
Ryoichi Sado
Saitama
JP
Agent
Hopgood Calimafde Kalil Blaustein & Judlowe
Assignee
Shin Etsu Polymer
JP
IPC
H01H 9/18
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