Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-02-21
2006-02-21
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S680000
Reexamination Certificate
active
07002756
ABSTRACT:
A negative first group optical system, a positive second group optical system, and a positive third group optical system are sequentially arranged from the object side. A stop moving integrally with the second group optical system is provided on the object side of the second group optical system. The focal length is changed by changing distances between the group optical systems, and the third group optical system is moved on an optical axis. The first group optical system includes a negative meniscus lens, a negative meniscus lens, and a positive lens. The second group optical system includes a cemented lens of a positive lens and a negative lens, a positive lens, and a positive lens. The third group optical system includes one positive lens not including an aspherical surface.
REFERENCES:
patent: 5619301 (1997-04-01), Suzuki et al.
patent: 6308011 (2001-10-01), Wachi et al.
patent: 6545819 (2003-04-01), Nanba et al.
patent: 6744564 (2004-06-01), Mihara et al.
patent: 6862143 (2005-03-01), Hoshi et al.
patent: 2003-35868 (2003-02-01), None
patent: 2003-107352 (2003-04-01), None
patent: 2003-131134 (2003-05-01), None
Epps Georgia
Hasan M.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
LandOfFree
Variable focal length lens, photographing lens unit, camera,... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable focal length lens, photographing lens unit, camera,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable focal length lens, photographing lens unit, camera,... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3712112