Illumination device

Details Illumination device Illumination device

1988-08-31

1991-01-29

Cuchlinski, Jr., William A.

Optics: image projectors

Miscellaneous

353101, 350167, 355 67, 355 53, 362268, G03B 2732

Patent

active

049881884

ABSTRACT:
An illumination device includes a light source; a secondary light source forming system for forming predetermined secondary light sources by use of light from the light source, the secondary light source forming system including a plurality of lens array units disposed in the direction of an optical axis and each having a plurality of lens elements distributed in a plane perpendicular to the optical axis; an optical system for directing light from the secondary light sources to a surface to be illuminated; and an actuating device for displacing at least one lens array unit in the direction of the optical axis to adjust the illuminance distribution on the surface being illuminated, while maintaining a substantially constant range of illumination on the surface being illuminated.

REFERENCES:
patent: 4497013 (1985-01-01), Ohta
patent: 4598197 (1986-07-01), Morita et al.
patent: 4682885 (1987-07-01), Torigoe
patent: 4733944 (1988-03-01), Fahlen et al.
patent: 4769750 (1988-09-01), Matsumoto et al.
patent: 4789222 (1988-12-01), Ota et al.
patent: 4851882 (1989-07-01), Takahashi et al.

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