Wide-angle lens and zoom lens

Details Wide-angle lens and zoom lens Wide-angle lens and zoom lens

2006-04-20

2008-10-14

Nguyen, Hung Henry (Department: 2851)

Photocopying

Projection printing and copying cameras

Step and repeat

C355S067000

Reexamination Certificate

active

07436488

ABSTRACT:
At least one exemplary embodiment is directed to a projection optical system which includes at least one prism and at least one positive lens. In a projection lens included in the projection optical system, the dispersion properties of the prism and the positive lens are set such that chromatic aberration occurring in the at least one prism can be appropriately corrected and/or reduced by using the at least one positive lens.

REFERENCES:
patent: 6028715 (2000-02-01), Takamoto et al.
patent: 2005/0036206 (2005-02-01), Wada
patent: 2005/0200967 (2005-09-01), Yamasaki et al.
patent: 2006/0023320 (2006-02-01), Kimura et al.
patent: 2006/0061872 (2006-03-01), Yamasaki
patent: 10-161027 (1998-06-01), None
patent: 2001-215411 (2001-08-01), None
patent: 2002-131639 (2002-05-01), None
patent: 2004-138678 (2004-05-01), None

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