Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2005-12-27
2005-12-27
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S689000, C359S676000
Reexamination Certificate
active
06980369
ABSTRACT:
To obtain a small and thin zoom lens unit, the present invention includes a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, and a third lens group having a positive refractive power as a whole, arranged from an object side to an image side. The zoom lens zooms from a short-focal end to a long-focal end and corrects image surface changes required in accordance with the zooming by means of moving the second lens group and the third lens group, wherein the first lens group includes a first lens having a negative refractive power and a prism having a negative refractive power and changing an incident light path, arranged from the object side to the image side, the second lens group including a single second lens, said third lens group including a single third lens.
REFERENCES:
patent: 4059344 (1977-11-01), Yamasita
patent: 5648835 (1997-07-01), Uzawa
patent: 6069648 (2000-05-01), Suso et al.
patent: 6339508 (2002-01-01), Nozawa et al.
patent: 2003/0179464 (2003-09-01), Amanai
patent: 2003/0214726 (2003-11-01), Mihara
patent: 06-107070 (1994-04-01), None
patent: 06-148518 (1994-05-01), None
patent: 09-211287 (1997-08-01), None
patent: 11-69214 (1999-03-01), None
patent: 2002-290523 (2002-10-01), None
Patent Abstracts of Japan for JP06-107070 published on Apr. 19, 1994.
Patent Abstracts of Japan for JP06-148518 published on May 27, 1994.
Patent Abstracts of Japan for JP11-69214 published on Mar. 9, 1999.
Patent Abstracts of Japan for JP09-211287 published on Aug. 15, 1997.
Patent Abstracts of Japan for JP2002-290523 published on Oct. 4, 2002.
Ishikawa Yo-ichi
Takeuchi Hotaka
Epps Georgia
Hasan M.
Nidec Copal Corporation
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