Illumination optical system
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United States of America Patent
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-
Jul 25, 1989
Issued Date -
N/A
app pub date -
Nov 4, 1988
filing date -
Dec 6, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An illumination optical system including an optical system effective to direct light from a light source to a surface to be illuminated, and an optical unit disposed in a path of the light defined by the optical system, the optical unit having a variable refracting power which is variable in accordance with the size of the surface to be illuminated.
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