Light guide for a telephone dial

Details Light guide for a telephone dial Light guide for a telephone dial

1991-10-31

1992-07-14

Lazarus, Ira S.

Illumination

Illuminated scale or dial

Telephone dial

362 27, 362 31, 362 88, 362330, 362800, 40337, 40546, H04M 122

Patent

active

051308975

ABSTRACT:
An improved light guide for use in illuminating a telephone dial includes apertures through which individual buttons of a telephone dial extend. These buttons are used for dialing and are illuminated by one or more light sources that are positioned within recesses in the light guide. Each recess comprises four inwardly curved walls for directing light from the light source along two paths that are substantially perpendicular to each other. Additional openings within the light guide are designed to reflect light into areas of the dial needing more illumination, and the sides of the light guide are shaped to reflect additional light into those areas. The present invention directs light so efficiently that only two sources are needed to provide uniform illumination in standard telephone dials.

REFERENCES:
patent: 2858417 (1958-10-01), Stevens et al.
patent: 3774021 (1973-11-01), Johnson
patent: 4323951 (1982-04-01), Pasco
patent: 4349705 (1982-09-01), Kuhfus
patent: 4438300 (1984-03-01), Morse
patent: 4449024 (1984-05-01), Stracener
patent: 4636593 (1987-01-01), Novak et al.
patent: 4776120 (1988-10-01), Utoh et al.
patent: 5083240 (1992-01-01), Pasco

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