Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2009-03-03
2010-10-05
Spector, David N (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S793000, C348S335000
Reexamination Certificate
active
07808726
ABSTRACT:
An image capture lens includes: when changed from infinity to close focusing, a first lens group moving from an image to an object with positive refractive power; and a second lens group fixed relatively to the image with negative refractive power, wherein the first lens group includes a negative first lens having a strong concave surface facing the image, the second lens group includes one negative lens having a strong concave surface facing the image or a negative cemented lens including positive and negative lenses, and conditional expressions; 0.7<f1/fi<0.9, 1.0<bf/fi<1.4, 0.5<Rf2/Rr2<1 are satisfied where fi: overall focal length, f1: first-lens-group focal length, bf: overall back focus, Rf2: radius of curvature of the image-side surface of the lens nearest to the object, and Rr2: radius of curvature of the surface nearest to the image of the second lens group.
REFERENCES:
patent: 4986643 (1991-01-01), Moriyama
patent: 5402268 (1995-03-01), Tatsuno
patent: 5623371 (1997-04-01), Hankawa
patent: 6747817 (2004-06-01), Takato
patent: 7706087 (2010-04-01), Obama
patent: 62-195617 (1987-08-01), None
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patent: 2005-189727 (2005-07-01), None
Rader & Fishman & Grauer, PLLC
Sony Corporation
Spector David N
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