Projection optical assembly with multiple refractive optical systems and related projector device
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United States of America Patent
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Jun 21, 2016
Grant Date -
Jul 24, 2014
app pub date -
Jul 5, 2012
filing date -
Jul 5, 2011
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Abstract
There is provided a projection optical system (1) that projects from a first image plane on a reducing side to a second image plane on an enlargement side, including a first refractive optical system (11) that includes eight lenses (L1) to (L8) and forms a first intermediate image (31) on the enlargement side using light that is incident from the reducing side, a second refractive optical system (12) that includes six lenses (L9) to (L14) and forms the first intermediate image (31) on the reducing side into a second intermediate image (32) on the enlargement side, and a first reflective optical system (20) that includes a first reflective surface (21a) with positive refractive power that is positioned closer to the enlargement side than the second intermediate image (32).
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