Projection type image display apparatus with light masking unit having two light-masking plates to adjust light masking amount
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United States of America Patent
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Jul 5, 2016
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N/A
app pub date -
Apr 22, 2014
filing date -
Aug 9, 2005
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Abstract
According to the present invention, a projection type image display apparatus enables control of a large amount of light masking through a light-masking unit while maintaining a uniform illumination distribution in an area to be illuminated by the illumination light. The apparatus uses two array lenses on which lens cells are arranged in matrix form, where light-masking unit masks the array lens installed on the light source side in their particular area. The light-masking unit adjusts the amount of light emitted from the light source. The light-masking area of lens cells adjacent to lens cells closest to an optical axis is made smaller than the light-masking area of other cells.
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