Projection optical system and projection type image display...

Details Projection optical system and projection type image display... Projection optical system and projection type image display...

2011-06-07

2011-06-07

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With reflecting element

C353S099000

Reexamination Certificate

active

07957078

ABSTRACT:
A projection optical system includes: a refracting optical section composed mainly of a plurality of lenses disposed in order from a reducing side, and having positive power; a first reflecting optical section having a concave reflecting optical surface; and a second reflecting optical section having a convex reflecting optical surface, wherein the projection optical system satisfies the following conditional expression, denoting a focal length of a total system combining the refracting optical section, the first reflecting optical section, and the second reflecting optical section as F, and a focal length of the refracting optical section as FL:in-line-formulae description="In-line Formulae" end="lead"?0.2<F/FL<0.5  (1).in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 2520633 (1950-08-01), Grey
patent: 7048388 (2006-05-01), Takaura et al.
patent: 7549755 (2009-06-01), Suzuki
patent: 2007/0184368 (2007-08-01), Nishikawa et al.
patent: 2009/0168031 (2009-07-01), Imaoka et al.
patent: 2009/0231690 (2009-09-01), Nishikawa et al.
patent: A-2004-258620 (2004-09-01), None
patent: A-2006-235516 (2006-09-01), None
patent: A-2007-79524 (2007-03-01), None
patent: A-2007-147970 (2007-06-01), None

Affiliated with

Also associated with

Rating

Projection optical system and projection type image display... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Projection optical system and projection type image display..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Projection optical system and projection type image display... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2625093