Portable telephone set housing having an illuminated switch pane

Details Portable telephone set housing having an illuminated switch pane Portable telephone set housing having an illuminated switch pane

1991-08-07

1993-08-10

Kuntz, Curtis

Telephonic communications

Supervisory or control line signaling

Substation originated

379422, 379429, H04M 100

Patent

active

052356361

ABSTRACT:
A portable telephone set housing having an illuminated switch portion. A flexible printed circuit board having a membrane switch and a liquid crystal display is mounted onto a support base of the telephone set housing. Onto the flexible printed circuit board is placed a key top sheet having a plurality of key tops. A switch panel having a plurality of holes for inserting therein of the key tops is mounted onto the key top sheet. The switch panel includes a transparent resin plate having an ink coating formed on the surface thereof except for a portion corresponding to the position of the display portion. In the membrane switch portion of the flexible printed circuit board, a plurality of light emitting diodes are provided which are adapted to introduce light into the interior of the switch panel.

REFERENCES:
patent: 4845748 (1989-07-01), Boharron
patent: 4873519 (1989-10-01), Matai et al.
patent: 4982424 (1991-01-01), Saito et al.
patent: 5130629 (1992-07-01), Kuhfus
patent: 5166868 (1992-11-01), Starton et al.

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