Low brightness lens for circular fluorescent lamps

Details Low brightness lens for circular fluorescent lamps Low brightness lens for circular fluorescent lamps

1982-08-20

1984-12-11

Brown, David H.

Illumination

Light modifier

Refractor

362216, 362223, 362260, 362311, 362337, 362340, F21V 502, F21V 508

Patent

active

044882084

ABSTRACT:
A transparent lighting diffuser panel is provided for circular gas discharge lamps and having an inner surface, facing the lamp, comprising a generally cylindrical toroidal fresnel lens with the optical centerline of the lens approximately equal to the lamp circle diameter and coaxial with the center of revolution of the lamp tube; and an outer surface, facing away from the lamp, comprising an overall pattern of elongated linear triangular prisms in a radial pattern coaxial with the toroidal lens and the lamp.

REFERENCES:
patent: 2953675 (1960-09-01), Kluge
patent: 3009054 (1961-11-01), Thomas
patent: 3093324 (1963-06-01), Dobrikin
patent: 3113728 (1963-12-01), Boyd
patent: 3320415 (1967-05-01), Neal et al.
patent: 3731082 (1973-05-01), Blaylock

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