Fixed-focus lens

Details Fixed-focus lens Fixed-focus lens

2008-03-21

2009-06-23

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S663000, C359S726000, C359S753000, C359S708000, C359S716000, C359S784000

Reexamination Certificate

active

07551363

ABSTRACT:
A fixed-focus lens including a first lens group, a second lens group and a third lens group which are arranged in sequence from an object side to an image side is provided. The first lens group has a negative refractive power and includes a first lens and a second lens arranged in sequence from the object side to the image side, and both having negative refractive powers. The first lens is an aspheric lens. The second lens group has a positive refractive power and includes a lens with positive refractive power. The third lens group has a positive refractive power and includes at least one first cemented lens. The fixed-focus lens satisfies 1.2<|fG1/f|<4.2 and 2.8<|fL2/f|<8.6, where f, fG1and fL2are effective focal lengths of the fixed-focus lens, the first lens group and the second lens respectively.

REFERENCES:
patent: 6144503 (2000-11-01), Sugano
patent: 6476981 (2002-11-01), Shikama
patent: 6563650 (2003-05-01), Moskovich
patent: 2007/0268598 (2007-11-01), Kang et al.
patent: I284747 (2007-08-01), None

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