Light guide

Details Light guide Light guide

1991-05-01

1992-01-21

Husar, Stephen F.

Illumination

Illuminated scale or dial

Edge illuminated modifier or light rod/pipe

362 24, 362 31, G01D 1128

Patent

active

050832409

ABSTRACT:
A light guide for illuminating a keyboard or keypad from behind comprises a transparent grid-like plate having an array of apertures in each of which is accommodated a respective key of the keyboard/keypad. Means are provided for reflecting light from an external source into the plan of the light guide. The individual apertures are surrounded by an upstanding rib formed integrally with the light guide. The top (outer) face of the rib is rendered optically imperfect to promote the escape of light thereform, thus providing an illuminated ring around each key.

REFERENCES:
patent: 2365864 (1944-12-01), Chapman
patent: 4930048 (1990-05-01), Ito

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