Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-09-26
2006-09-26
Schwartz, Jordan M. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S680000
Reexamination Certificate
active
07113347
ABSTRACT:
A zoom lens, including, in order from an object side to an image side (a) a first lens unit of negative optical power, (b) a second lens unit of positive optical power, and (c) a third lens unit of positive optical power, wherein a separation between the first lens unit and the second lens unit and a separation between the second lens unit and the third lens unit are varied to effect variation of magnification, and wherein the zoom lens satisfies the following conditions: ndp3<1.5 and vdp3>70.0, where ndp3and vdp3are a refractive index and Abbe number, respectively, of material of the positive lens in the third lens unit.
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Hamano Hiroyuki
Hoshi Koji
Nanba Norihiro
Sekita Makoto
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Schwartz Jordan M.
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