Optical systems with compact back focal lengths
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United States of America Patent
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Aug 22, 2017
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app pub date -
Jan 15, 2016
filing date -
May 9, 2008
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Abstract
Optical systems, such as 2-D and 3-D projection systems, may be configured to have a compact back focal length to allow for more compact projection lenses, lower throw ratios, improved contrast, or any combination thereof. In an embodiment, an optical system may include a relay element configured to form an intermediate image having a focal point proximate to a projection lens.
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