Fixed focal length lens system

Details Fixed focal length lens system Fixed focal length lens system

2007-10-10

2009-08-25

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S717000, C359S756000, C359S757000

Reexamination Certificate

active

07580206

ABSTRACT:
A fixed focal length lens system comprises a first lens unit and a second lens unit. The first lens unit comprises a plastic negative lens, wherein the first lens unit has a negative diopter, and the plastic negative lens comprises at least one non-spherical surface. The second lens unit comprises a plastic positive lens, wherein the second lens unit has a positive diopter. The fixed focal length lens system satisfies the equation: −1<2Gf/1Gf<0, wherein 1Gf is the focal length of the first lens unit and 2Gf is the focal length of the second lens unit.

REFERENCES:
patent: 6995925 (2006-02-01), Noda

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