Light guide

Details Light guide Light guide

1990-08-15

1991-10-01

Husar, Stephen F.

Illumination

Illuminated scale or dial

Telephone dial

362 27, 362 31, 40546, H04M 122

Patent

active

050539280

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. The transparent plate comprises an integral lens aligned with a reflector for directing light from an external source into the plane of the plate. Various plane reflecting surfaces are provided for reflecting the light in a localized path completely surrounding each of the apertures. This arrangement enables the keys to be illuminated with a high degree of uniformity using only relatively few distributed light sources.

REFERENCES:
patent: 3774021 (1973-11-01), Johnson
patent: 4124879 (1978-11-01), Schoemer
patent: 4349705 (1982-09-01), Kuhfus
patent: 4670633 (1987-06-01), Kaiwa et al.
patent: 4937408 (1990-06-01), Hattori et al.

Affiliated with

Also associated with

Rating

Light guide does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Light guide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light guide will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1759791