Fixed-focus lens

Details Fixed-focus lens Fixed-focus lens

2008-12-10

2009-12-29

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S781000

Reexamination Certificate

active

07639433

ABSTRACT:
A fixed-focus lens including a first lens, a second lens, a cemented lens, an aperture stop, and a fifth lens is provided. The first lens disposed between an object side and an image side has a negative refractive power. The second lens disposed between the first lens and the image side has a positive refractive power. The cemented lens is disposed between the second lens and the image side. The cemented lens consists of a third lens and a fourth lens arranged in sequence from the object side to the image side. One of the third lens and the fourth lens has a positive refractive power, and the other has a negative refractive power. The aperture stop is disposed between the fourth lens and the image side. The fifth lens disposed between the aperture stop and the image side has a positive refractive power.

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patent: 6229962 (2001-05-01), Imamura
patent: 6633436 (2003-10-01), Wada et al.
patent: 7095569 (2006-08-01), Rege et al.

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