Illumination system for superposing light beams one upon another on a surface using a projecting system having different focal point positions
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United States of America Patent
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Feb 17, 1998
Grant Date -
N/A
app pub date -
Feb 16, 1995
filing date -
Feb 16, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An illumination device for illuminating a surface to be illuminated, includes a light source and an irradiation optical system for mixedly projecting light beams from the light source to the surface, wherein the irradiation optical system has a first focal point with respect to a first plane, which is disposed at a position out of the surface.
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