Optical: systems and elements – Lens – With light limiting or controlling means
Reexamination Certificate
2011-07-19
2011-07-19
Martinez, Joseph (Department: 2873)
Optical: systems and elements
Lens
With light limiting or controlling means
C359S740000, C396S461000
Reexamination Certificate
active
07982973
ABSTRACT:
Disclosed herein is a zoom lens, wherein a stop moves in an optical axis direction n in a phase of zooming; a position of the stop in a telephoto end is located on an object side with respect to a position of the stop in a wide-angle end; an opening size of the stop is controlled in conjunction with the zooming so that an open F number becomes approximately constant in a range from the wide-angle end to a specific intermediate focal length; the opening size of the stop is made approximately constant in a range from the specific intermediate focal length to the telephoto end so that the open F number is changed; and the specific intermediate focal length fulfills the following conditional expression (1), wide-angle end focal length×1.5<specific intermediate focal length<telephoto end focal length/1.4 . . . (1).
REFERENCES:
patent: 5790316 (1998-08-01), Terasawa et al.
patent: 2000-221399 (2000-08-01), None
patent: 2005-181556 (2005-07-01), None
patent: 2007-248770 (2007-09-01), None
patent: 2007-264381 (2007-10-01), None
Japanese Office Action issued Nov. 25, 2010 for corresponding Japanese Application 2008-192364.
Koyama Takashi
Nanjo Yusuke
Martinez Joseph
Rader & Fishman & Grauer, PLLC
Sony Corporation
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