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Oblique projection optical system

  • US 20060164605A1
  • Filed: 11/03/2005
  • Published: 07/27/2006
  • Est. Priority Date: 11/10/2004
  • Status: Active Grant
First Claim
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1. An oblique projection optical system for performing enlargement projection from a primary image surface on a reduction side to a secondary image surface on an enlargement side, wherein at least one reflective surface having an optical power is provided, and wherein, assuming that of said at least one reflective surface, the reflective surface located on a most secondary image surface side in an optical path is a first curved reflective surface, the first curved reflective surface has a portion having a positive optical power and a portion having a negative optical power.

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