Fixed-focus lens

Details Fixed-focus lens Fixed-focus lens

2011-05-17

2011-05-17

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S749000

Reexamination Certificate

active

07944623

ABSTRACT:
A fixed-focus lens adapted to be disposed between a magnified side and a reduced side is provided. The fixed-focus lens includes a first lens group, a second lens group, and a third lens group. The first lens group disposed between the magnified side and the reduced side includes three lenses and has a negative refractive power. The second lens group disposed between the first lens group and the reduced side includes five lenses and has a positive refractive power. The third lens group disposed between the second lens group and the reduced side includes five lenses and has a positive refractive power. The fixed-focus lens satisfies |F1/F|<1.35, 3.5<|F2/F|<4.5, and 4<|F3/F|<5, wherein F1is the effective focal length (EFL) of the first lens group, F2is the EFL of the second lens group, F3is the EFL of the third lens group, and F is the EFL of the fixed-focus lens.

REFERENCES:
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patent: 6542316 (2003-04-01), Yoneyama
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patent: 7126767 (2006-10-01), Lu
patent: 7173777 (2007-02-01), Lu et al.
patent: 7184219 (2007-02-01), Kobayashi

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