Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2005-08-02
2005-08-02
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S686000
Reexamination Certificate
active
06924939
ABSTRACT:
Disclosed is a zoom lens system which includes, in order from the object side to the image side, a first lens unit having negative optical power, a second lens unit having positive optical power, and a third lens unit having positive optical power. During the zooming operation of the zoom lens system, a distance between the first lens unit and the second lens unit is smaller at the telephoto end than at the wide-angle end, and a distance between the second lens unit and the third lens unit is changed. During the zooming operation of the zoom lens system from the wide-angle end to the telephoto end, the second lens unit moves toward the object side. Three lens elements constitute the second lens unit, and the location of its aspherical surface is appropriately set to achieve excellent remarkable performance.
REFERENCES:
patent: 4662723 (1987-05-01), Imai
patent: 4687302 (1987-08-01), Ikemori et al.
patent: 4733952 (1988-03-01), Fujioka
patent: 4802747 (1989-02-01), Horiuchi
patent: 5434710 (1995-07-01), Zozawa
patent: 5872660 (1999-02-01), Kohno et al.
patent: 5978154 (1999-11-01), Hashimura
patent: 6038084 (2000-03-01), Okada et al.
patent: 6191896 (2001-02-01), Itoh
patent: 6308011 (2001-10-01), Wachi et al.
patent: 6351337 (2002-02-01), Tanaka
patent: 6417973 (2002-07-01), Mihara et al.
patent: 6498687 (2002-12-01), Sekita et al.
patent: 6545819 (2003-04-01), Nanba et al.
patent: 6597513 (2003-07-01), Minefuji
patent: 60-31110 (1985-02-01), None
patent: 63-81313 (1988-04-01), None
patent: 3-296706 (1991-12-01), None
patent: 5-323190 (1993-12-01), None
patent: 7-52256 (1995-02-01), None
patent: 9-21950 (1997-01-01), None
patent: 10-3037 (1998-01-01), None
patent: 10-104520 (1998-04-01), None
patent: 10-206732 (1998-08-01), None
patent: 11-84242 (1999-03-01), None
patent: 2000-19392 (2000-01-01), None
patent: 2000-89110 (2000-03-01), None
patent: 2000-275520 (2000-10-01), None
patent: 2001-272602 (2001-10-01), None
Canon Kabushiki Kaisha
Choi William
Epps Georgia
Morgan & Finnegan , LLP
LandOfFree
Zoom lens system, and image pick-up apparatus incorporating... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Zoom lens system, and image pick-up apparatus incorporating..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens system, and image pick-up apparatus incorporating... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3455030