Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2008-11-24
2009-10-27
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S649000, C359S650000, C359S651000, C359S715000, C359S740000, C359S773000
Reexamination Certificate
active
07609454
ABSTRACT:
An imaging lens includes, in the order from the object side to the image side, a first lens of positive refraction power, a second lens of negative refraction power, a third lens of positive refraction power, and a fourth lens of negative refraction power. The imaging lens satisfies the formulae (1) 1<T/F<1.4; (2) R3/F>4; and (3) S1/S2>3, where T is the overall length of the imaging lens, F is the focal length of the imaging lens, R3is the radius of curvature of the object-side surface of the second lens, S1is the vertical distance from the edge to the center of the image-side surface of the third lens, and S2is the horizontal distance from the edge to the center of the image-side surface of the third lens.
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patent: 7443611 (2008-10-01), Shinohara
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Huang Chun-Hsiang
Yin Chun-Yi
Hon Hai Precision Industry Co. Ltd.
Lester Evelyn A.
Ma Zhigang
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