Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2008-01-17
2008-12-30
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S649000, C359S651000, C359S713000, C359S714000, C359S715000, C359S716000, C359S740000, C359S761000, C359S762000, C359S781000, C359S782000, C359S783000, C359S790000
Reexamination Certificate
active
07471465
ABSTRACT:
To provide a high-brightness, small, low-cost optical apparatus which covers a wide-angle to super-wide-angle region and which reliably corrects various aberrations with a small number of lenses.At least one negative lens unit1, a meniscus lens2that is convex on an object side, an aperture stop S, and a double-convex positive lens3are arranged in order from the object side. At least one of the lenses positioned on the object side of the aperture stop S and the positive lens3include respective aspherical surfaces. When va is an average Abbe number of all of the lenses excluding the meniscus lens, vb is an Abbe number of the meniscus lens, f is a focal length of the entire system, f12is a combined focal length of the negative lens unit and the meniscus lens, ts is a distance between the aperture stop and the positive lens along an axis, L is a distance between a vertex of a lens surface nearest to the object side and a vertex of a lens surface nearest to the image side, t2is a central thickness of the meniscus lens, θs is an incident angle of a chief ray that passes through the aperture stop at a maximum angle of view, 1.4<va/vb, 0<ts/L<0.1, 0.2<t2/L<0.5, −10<f12/f<−1.0, and 25°<θs<40° are satisfied.
REFERENCES:
patent: 5734511 (1998-03-01), Braat
patent: 7199947 (2007-04-01), Wang et al.
patent: 2-77712 (1990-03-01), None
patent: 7-72382 (1995-03-01), None
patent: 9-21947 (1997-01-01), None
patent: 9-503600 (1997-04-01), None
patent: 2002-72085 (2002-03-01), None
International Search Report dated Oct. 31, 2006 from corresponding International Application No. PCT/JP2006/314247.
Matsuo Eiki
Yamashita Tatsumaro
Alps Electric Co. ,Ltd.
Beyer Law Group LLP
Lester Evelyn A.
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