Segmented filament light source with improved illumination outpu

Details Segmented filament light source with improved illumination outpu Segmented filament light source with improved illumination outpu

1986-07-14

1988-11-08

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 1, 362 16, G03B 2754

Patent

active

047836873

ABSTRACT:
The output of a segmented filament lamp is made more uniform by placing a reflector assembly adjacent the lamp, the reflector assembly having a plurality of spherical segments formed along its length. Each spherical segment is located so as to reflect light from the filaments back to the filament plane to form a real image of each filament in interfilament space. The lamp output thus appears as a uniform and constant source. This type of filament lamp is especially useful in conjunction with an imaging system which requires a very uniform light level at a projection lens or at the surface of a document platen.

REFERENCES:
patent: 3358475 (1967-12-01), Bockenstedt
patent: 3763348 (1973-10-01), Castello
patent: 3947115 (1976-03-01), Hamaguchi
patent: 4194835 (1980-03-01), Shiode
patent: 4300831 (1981-11-01), Isago
patent: 4427283 (1984-01-01), Gasper
patent: 4435064 (1984-03-01), Tsukada et al.

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