Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-08-31
2008-05-20
Spector, David N. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S682000, C359S689000, C359S691000, C348S240300, C396S072000
Reexamination Certificate
active
07375900
ABSTRACT:
An object of the present invention is to provide a compact size variable power optical system capable of producing a high quality image. The variable power optical system comprises a plurality of lens groups for forming an optical image on an image surface of an image pickup device. Among the plurality of lens groups, the first lens group, which is disposed in the most subject side has a negative refraction power, includes at least a lens having a negative refraction power and a reflective optical element for bending the optical axis. When varying the variable power, the axial distance between the first lens group and the image surface varies. When Nd denotes the refraction power of the lens having negative refraction power at d-line, the refraction power satisfies the conditional formula Nd>1.81.
REFERENCES:
patent: 6728482 (2004-04-01), Hagimori et al.
patent: 2005/0285970 (2005-12-01), Yamaguchi et al.
patent: 2002-341244 (2002-11-01), None
patent: 2003-43354 (2003-02-01), None
patent: 2004-37924 (2004-02-01), None
patent: 2005-84151 (2005-03-01), None
Kohno Tetsuo
Yagyu Genta
Yamaguchi Shinji
Konica Minolta Photo Imaging Inc.
Sidley Austin LLP
Spector David N.
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