Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-01-24
2006-01-24
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S676000, C359S680000, C359S682000, C359S716000, C359S740000, C359S753000, C359S784000
Reexamination Certificate
active
06989943
ABSTRACT:
A zoom lens system, includes a first lens unit, a second lens unit, and a third lens unit. The second lens unit is moved to the object side in zooming such that an interval between the first lens unit and the second lens unit at a telephoto end becomes smaller than an interval between the first lens unit and the second lens unit at a wide angle end. The first lens unit includes a first lens element, a second lens element, and a third lens element. The first lens element has an aspherical surface of a shape that the negative refracting power decreases from a lens central portion to a lens peripheral portion. The second lens element is formed in a meniscus shape which is convex on the object side. A refractive index of a material constituting the first and second lens elements is appropriately selected.
REFERENCES:
patent: 4662723 (1987-05-01), Imai
patent: 4733952 (1988-03-01), Fujioka
patent: 4802747 (1989-02-01), Horiuchi
patent: 5434710 (1995-07-01), Zozawa
patent: 6735020 (2004-05-01), Sekita
patent: 6744564 (2004-06-01), Mihara et al.
patent: 6809879 (2004-10-01), Mihara
patent: 6836375 (2004-12-01), Ito
patent: 6844986 (2005-01-01), Nanba
patent: 6856467 (2005-02-01), Iyama
patent: 6888683 (2005-05-01), Itoh
patent: 2003/0012567 (2003-01-01), Itoh
patent: 2004/0076416 (2004-04-01), Mihara
patent: 2004/0085472 (2004-05-01), Mihara
patent: 60-031110 (1985-02-01), None
patent: 63-81313 (1988-04-01), None
patent: 3-296706 (1991-12-01), None
patent: 6-66008 (1994-08-01), None
patent: 7-52256 (1995-06-01), None
patent: 10-213745 (1998-08-01), None
patent: 2001-100098 (2001-04-01), None
Lester Evelyn A.
Morgan & Finnegan L.L.P.
LandOfFree
Zoom lens system and image pickup apparatus having zoom lens... 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 pickup apparatus having zoom lens..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens system and image pickup apparatus having zoom lens... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3584232