Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2008-01-04
2009-06-09
Choi, William C (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S558000, C359S753000, C359S784000, C359S900000
Reexamination Certificate
active
07545573
ABSTRACT:
A projector optical system for forming a real image by projecting an image of a display element has, sequentially from a screen side or an observation side, a first lens group having positive refractive power, an aperture diaphragm, a second lens group, and a third lens group having positive refractive power, with a diffractive optical element being provided on at least one of the first lens group and the second lens group which are adjacent to the aperture diaphragm. The projector optical system satisfies:in-line-formulae description="In-line Formulae" end="lead"?0.05<G/L<0.9in-line-formulae description="In-line Formulae" end="tail"?wherein G is an air gap on the optical axis between the second lens group and the third lens group, and L is a length on the optical axis, from the surface that is closest to the screen side to the display element.
REFERENCES:
patent: 5703721 (1997-12-01), Bietry et al.
patent: 5930043 (1999-07-01), Ogawa
patent: 5969875 (1999-10-01), Sugawara
patent: 6208474 (2001-03-01), Kondo
patent: 6317268 (2001-11-01), Harrigan
patent: 6693744 (2004-02-01), Shimomura
patent: 6765731 (2004-07-01), Cannon
patent: 2005/0201249 (2005-09-01), Ikenaka
patent: 2005/0201250 (2005-09-01), Mimori et al.
patent: 2008/0019001 (2008-01-01), Suzuki
patent: 1 862 826 (2007-12-01), None
patent: 9-171146 (1997-06-01), None
patent: 10-142502 (1998-05-01), None
patent: 10-170818 (1998-06-01), None
patent: 2000-66093 (2000-03-01), None
patent: 2002-156580 (2002-05-01), None
patent: 2003-195165 (2003-07-01), None
patent: 2004-117520 (2004-04-01), None
patent: 2004-279958 (2004-10-01), None
patent: 2004-279958 (2004-10-01), None
patent: 2005-275280 (2005-10-01), None
patent: 2008-26440 (2008-02-01), None
patent: 2004/095108 (2004-11-01), None
patent: 2005/088624 (2005-09-01), None
patent: 2005/088625 (2005-09-01), None
patent: 2006/090614 (2006-08-01), None
Choi William C
Dinh Jack
Miles & Stockbridge P.C.
Nikon Corporation
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