Lens module

Details Lens module Lens module

2011-03-22

2011-03-22

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S651000

Reexamination Certificate

active

07911716

ABSTRACT:
A lens module including a first lens group, a second lens group, a third lens group, and an aperture stop is provided. The first lens group disposed between a magnified side and a reduced side has a positive refractive power. The second lens group disposed between the first lens group and the reduced side has a negative refractive power. The third lens group disposed between the second lens group and the reduced side has a positive refractive power. The aperture stop is disposed between the first lens group and the second lens group. Additionally, the distance from a center of the second surface to a center of the third surface is L1, an effective focal length is f, and the lens module satisfies 0.4<L1/f<1.2.

REFERENCES:
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patent: 6301056 (2001-10-01), Kreitzer
patent: 6747816 (2004-06-01), Sato
patent: 2003/0161050 (2003-08-01), Sato et al.
patent: M362997 (2009-08-01), None

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