Terminal apparatus

Details Terminal apparatus Terminal apparatus

1995-05-16

1996-08-13

Hofsass, Jeffery

Telephonic communications

Supervisory or control line signaling

Substation originated

379369, 379440, 379428, 379396, H04M 123

Patent

active

055464572

ABSTRACT:
A telephone having a plurality of key tops and a small number of light sources for illuminating the key tops with a thin construction. A switch panel formed of a transparent material is mounted on a case of the telephone. The switch panel has a plurality of holes through which the key tops of a key top sheet are respectively inserted. An opaque film is formed on an outer surface of the switch panel. A plurality of conductive contracts are formed on a lower surface of the key top sheet at positions corresponding to the respective key tops. A plurality of switch patterns are formed on a printed circuit board so as to respectively face the conductive contacts. With this construction, the switch panel functions as a light guiding board, thereby efficiently illuminating the plurality of key tops by means of the small number of light sources such as LEDs.

REFERENCES:
patent: 4124879 (1978-11-01), Schoemer
patent: 4343975 (1982-08-01), Sado
patent: 4349705 (1982-09-01), Kuhfus
patent: 4734679 (1988-03-01), Haskins
patent: 4845748 (1989-07-01), Bohannon
patent: 4866764 (1989-09-01), Baker, III
patent: 5235636 (1993-08-01), Takagi et al.
patent: 5237607 (1993-08-01), Diamantis

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