Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2007-11-02
2009-06-16
Spector, David N (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S781000, C359S771000
Reexamination Certificate
active
07548385
ABSTRACT:
A wide-angle lens system includes a negative first meniscus lens element, a positive second lens element, a positive third biconvex lens element, and a negative fourth meniscus lens element, in this order from the object;wherein said wide-angle lens system satisfies the following condition: 0.25<H/(p3+p4)<0.60whereinH designates the distance between the second principal point of the positive third biconvex lens element and the first principal point of the negative fourth meniscus lens element, when the focal length of the entire wide-angle lens system is normalized to 1.0;p3designates the refractive power of the positive third biconvex lens element when the focal length of the entire wide-angle lens system is normalized to 1.0;f3designates the focal length of the positive third biconvex lens element when the focal length of the entire wide-angle lens system is normalized to 1.0, i.e., p3=1/f3;p4designates the refractive power of the negative fourth meniscus lens element when the focal length of the entire wide-angle lens system is normalized to 1.0; andf4designates the focal length of the negative fourth meniscus lens element wherein the focal length of the entire wide-angle lens system is normalized to 1.0, i.e., p4=1/f4.
REFERENCES:
patent: 6043941 (2000-03-01), Yamada et al.
patent: 2004/0150894 (2004-08-01), Saori
patent: 2005/0237627 (2005-10-01), Hirakawa
patent: 2005/0280901 (2005-12-01), Tomioka
patent: 2006/0126192 (2006-06-01), Ryu et al.
patent: 2007/0201140 (2007-08-01), Kato
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patent: 2004 354829 (2004-12-01), None
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English language Abstract of JP 5-26489, Oct. 15, 1993.
English language Abstract of JP 2004-354829, Dec. 16, 2004.
Greenblum & Bernstein P.L.C.
Hoya Corporation
Spector David N
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