Laminar light guide

Details Laminar light guide Laminar light guide

1980-06-16

1982-04-06

Lechert, Jr., Stephen J.

Illumination

Illuminated scale or dial

Edge illuminated modifier or light rod/pipe

362 26, 362 31, 362 32, 362268, 362297, 362307, 362308, 362330, 362339, G01D 1128

Patent

active

043239510

ABSTRACT:
The present invention relates to laminar light guides which are particularly suitable for providing illumination from one or more light sources to a plurality of instruments and other display devices as in a vehicle instrument panel. The guide makes efficient use of the light available from the light sources. The guide comprises a transparent lamina (1,2,3) having at least one integrally formed light input socket (4) for receiving a light source (14). The socket (4) is formed with lens means (13) and reflecting means (15) for directing light from the source into the plane of the lamina where it is internally reflected until encountering extracting means including roughened surfaces (6,7,8,9) for reflecting light diffusely out of the plane of the lamina or conical apertures (5) for reflecting light into a beam transverse to the plane of the lamina. The light is extracted to illuminate display characters (16) or areas in an otherwise opaque screen (17), or to direct light into pointers of instruments, for example clocks, speedometers etc.

REFERENCES:
patent: 4233927 (1980-11-01), Oikawa

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