Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-01-16
2007-01-16
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S682000, C359S683000, C359S691000, C359S793000, C359S740000, C359S717000
Reexamination Certificate
active
11419543
ABSTRACT:
A zoom lens system comprises, successively from the object side, a first negative lens group and a positive second lens group. The first lens group includes a negative meniscus lens and a positive meniscus lens, the negative meniscus lens and the positive meniscus lens each has at least one aspherical surface. The second lens group includes a first positive auxiliary group and a positive second auxiliary group. The refractive power of the first group is 1/f1, the refractive power of the second group is 1/f2, the focal length of the whole lens system fwwhen the distance between the lens groups is increased, fTis the focal length of the whole lens system when the distance between the lens groups is decreased, and they satisfy the following conditional expressions of: 0.9≦|f1|/(fw·fT)1/2≦1.1 and 1.15≦|f1|/f2≦1.35.
REFERENCES:
patent: 4540249 (1985-09-01), Mogami
patent: 5276553 (1994-01-01), Tatsuno
patent: 5452134 (1995-09-01), Sato
patent: 6308011 (2001-10-01), Wachi et al.
patent: 6498687 (2002-12-01), Sekita et al.
patent: 6545819 (2003-04-01), Nanba et al.
patent: 6977778 (2005-12-01), Nose et al.
patent: 2003/0012567 (2003-01-01), Itoh
patent: 2004/0136705 (2004-07-01), Suzuki
patent: 2005/0200968 (2005-09-01), Nose et al.
patent: 2005/0200970 (2005-09-01), Nose et al.
patent: 2005/0231817 (2005-10-01), Matsusaka et al.
patent: 2006/0018033 (2006-01-01), Masui et al.
Largan Precision Co., Ltd.
Lester Evelyn A.
Shia Banger
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