Zoom optical system and electronic imaging apparatus using...

Details Zoom optical system and electronic imaging apparatus using... Zoom optical system and electronic imaging apparatus using...

2007-03-21

2008-07-22

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S676000, C359S686000

Reexamination Certificate

active

07403345

ABSTRACT:
A zoom optical system comprises in order from an object side, the first lens group consisting of one cemented lens in which each of the surfaces contacted with air is aspherical, and having negative refracting power as a whole, the second lens group consisting of one positive single lens and one cemented lens, and having positive refracting power as a whole, the third lens group of one negative lens having an aspherical surface, and the fourth lens group consisting of one positive lens having an aspherical surface. When magnification is carried out, each of the lens groups is moved while changing each relative distance among the lens groups.

REFERENCES:
patent: 6349002 (2002-02-01), Shibayama et al.
patent: 2002/0008920 (2002-01-01), Mihara et al.
patent: 2002/0057502 (2002-05-01), Ishii et al.
patent: 2005/0030641 (2005-02-01), Kuba et al.
Patent Abstracts of Japan, Publication No. 11-211984, Aug. 6, 1999, and English translation of the Abstract.

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