Illumination device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 29, 1991
Grant Date -
N/A
app pub date -
Aug 31, 1988
filing date -
Aug 31, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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