Image forming optical system

Details Image forming optical system Image forming optical system

2006-05-30

2009-12-15

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S740000, C359S749000, C359S753000, C359S761000, C359S762000

Reexamination Certificate

active

07633688

ABSTRACT:
An image forming optical system which comprises a negative lens unit and a positive lens unit arranged in order from an object side. The negative lens unit includes, in order from the object side, a first negative lens and a second negative lens, or a first negative lens, a second negative lens and a third negative lens. The positive lens unit includes, in order from the object side, a third positive lens, a fourth negative lens, a fifth positive lens and a sixth positive lens, or a fourth positive lens, a fifth negative lens, a sixth positive lens and a seventh positive lens.

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patent: 2002-072085 (2002-03-01), None
patent: 2004-317866 (2004-11-01), None

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