Color image readout lens and color image readout apparatus

Details Color image readout lens and color image readout apparatus Color image readout lens and color image readout apparatus

2008-06-05

2010-02-02

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S558000, C359S742000

Reexamination Certificate

active

07656594

ABSTRACT:
A color image readout lens comprises, in order from an object side: a first group comprising a positive lens convex toward the object side and a biconcave negative lens; a stop; a second group comprising one diffractive optical element that has at least one flat surface and has a diffractive structure formed on the flat surface; and a third group comprising a biconvex positive lens and a negative lens concave toward the object side.

REFERENCES:
patent: 5930043 (1999-07-01), Ogawa
patent: 5959785 (1999-09-01), Adachi
patent: 6208474 (2001-03-01), Kondo
patent: 2552026 (2003-05-01), None
patent: 10-311946 (1998-11-01), None
patent: 10-339843 (1998-12-01), None
patent: 2000-66093 (2000-03-01), None
patent: 2007-94278 (2007-04-01), None

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