Adjustable Beam Size Illumination Optical Apparatus and Beam Size Adjusting Method
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United States of America Patent
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Issued Date -
Sep 22, 2011
app pub date -
Mar 16, 2011
filing date -
Mar 17, 2010
priority date (Note) -
Abandoned
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Abstract
An adjustable beam size illumination optical apparatus includes a beam size adjusting optical system which includes groups of cylindrical array lenses disposed correspondingly to the long and short axis directions respectively and having variable intervals among the lenses, and a group of cylindrical telescope lenses disposed correspondingly to one of the long and short axis directions and having variable intervals among the lenses, and adjusts parallel light from a light source in size in accordance with the two axis directions orthogonal to each other. The lens interval of one of the cylindrical array lens groups and the cylindrical telescope lens group is changed to adjust a beam size on a projection surface in accordance with the long axis direction or the short axis direction. Thus, it is possible to adjust the beam size in accordance with the long axis direction and the short axis direction individually, and it is possible to make irradiation with the beam with uniform intensity.
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