Optical illumination system and projection apparatus comprising

Details Optical illumination system and projection apparatus comprising Optical illumination system and projection apparatus comprising

1990-04-30

1992-03-24

Cuchlinski, Jr., William A.

Optics: image projectors

Particular condenser

353 31, 353 38, 362309, 359622, G03B 2120

Patent

active

050981846

ABSTRACT:
An efficient illumination system for an image projection apparatus is described, which system comprises a radiation source (20), a concave reflector (21) and a first and a second lens plate (25, 28) each being provided with a matrix of lenses (26, 29) for forming superimposed images of the radiation source on the object (1) to be illuminated, the aspect ratio of the lenses (26, 29) corresponding to that of the object (1).

REFERENCES:
patent: 2326970 (1943-08-01), Rautsch
patent: 3166625 (1965-01-01), Brumley
patent: 3267802 (1966-08-01), Noble
patent: 3296923 (1967-01-01), Miles
patent: 3555987 (1971-01-01), Browning
patent: 3941475 (1976-03-01), Sheets
patent: 4626082 (1986-12-01), Mochizuki et al.

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