Illuminating device

Details Illuminating device Illuminating device

1988-06-03

1990-06-12

Lall, Parshotam S.

Illumination

Work-table lighting system

362247, 362296, 362297, 355 67, 355 71, 350237, G03B 2752, F21V 700

Patent

active

049338170

ABSTRACT:
An illuminating device comprises a light-condensing block forming a transparent pillar member having a greater refractive index than the ambience and having a cross-sectional shape forming a part of an ellipse, and a light source disposed axially of the pillar member in a focal plane containing one focus of the ellipse for illuminating an object through the light-condensing block.

REFERENCES:
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patent: 3586849 (1971-06-01), Starkweather et al.
patent: 3752974 (1973-08-01), Baker et al.
patent: 3914593 (1975-10-01), Laribe
patent: 4041344 (1977-08-01), Lagiusa
patent: 4059916 (1977-11-01), Tachihara et al.
patent: 4095881 (1978-06-01), Maddox
patent: 4220982 (1980-09-01), Martino
patent: 4240692 (1980-12-01), Winston
patent: 4441783 (1984-04-01), Houghton et al.
patent: 4712885 (1987-12-01), Dawson et al.

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