Optical: systems and elements – Lens – Telephoto
Reexamination Certificate
2007-03-23
2009-06-02
Collins, Darryl J (Department: 2873)
Optical: systems and elements
Lens
Telephoto
C359S691000
Reexamination Certificate
active
07542219
ABSTRACT:
An intermediate telephoto lens system includes a positive front lens group, a variable-aperture diaphragm, and a positive rear lens group, in this order from the object.The positive front lens group includes a positive first lens element L1, a positive second lens element L2and a negative third lens element L3, in this order from the object.The positive rear lens group includes cemented lens elements having a negative fourth lens element L4and a positive fifth lens element L5, and a positive sixth lens element L6, in this order from the object.The intermediate telephoto lens system satisfies the following condition:in-line-formulae description="In-line Formulae" end="lead"?2.0<f/f12<3.0 (1)in-line-formulae description="In-line Formulae" end="tail"?whereinf designates the focal length of the entire intermediate telephoto lens system; andf12designates the combined focal length of the positive first lens element L1and the positive second lens element L2.
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English language abstract of JP 11-271610.
English language abstract of JP 2000-35534.
English language abstract of JP 2000-292689.
English language abstract of JP 2000-330014.
English language abstract of JP 2001-281535.
U.S. Appl. No. 11/672,224 to Saori, filed Feb. 7, 2007.
Collins Darryl J
Greenblum & Bernstein P.L.C.
Hoya Corporation
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