Lens system

Details Lens system Lens system

2007-12-07

2008-10-28

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S740000, C359S767000

Reexamination Certificate

active

07443610

ABSTRACT:
A lens system comprises a first lens positive in power, a second lens positive in power, a third lens negative in power, a fourth lens positive in power, and a fifth lens negative in power. The lens system meets a criteria of 1.6<TT/f<1.8, 1.6<f/f2<1.8, and −0.6<f/f5<−0.4, wherein TT denotes a distance between an object-side surface of the first lens and an image plane of the lens system; f2denoting an effective focal length of the second lens; f denoting an effective focal length of the entire lens system.

REFERENCES:
patent: 4076390 (1978-02-01), Fleischman
patent: 4458991 (1984-07-01), Yamada
patent: 4575198 (1986-03-01), Tanaka
patent: 4830478 (1989-05-01), Yamakawa et al.
patent: 6445513 (2002-09-01), Sato
patent: 7110188 (2006-09-01), Matsui et al.

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