Projection optical system

Details Projection optical system Projection optical system

1998-04-02

2000-07-11

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359649, G02B 900, G02B 300

Patent

active

060881712

ABSTRACT:
A projection optical system including a first lens group G1 having positive power; a second lens group G2 having negative power; and a third lens group G3 having positive power wherein the lens elements in each of the lens groups are composed of glass materials selected from the group consisting of fluorite and quartz. Also, the projection optical system satisfies the following condition:

REFERENCES:
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patent: 4891663 (1990-01-01), Hirose
patent: 5555479 (1996-09-01), Nakagiri
patent: 5568325 (1996-10-01), Hirano et al.
patent: 5636000 (1997-06-01), Ushida et al.
patent: 5691802 (1997-11-01), Takahashi
patent: 5694241 (1997-12-01), Ishiyama et al.
patent: 5771125 (1998-06-01), Ishiyama
patent: 5805334 (1998-09-01), Takahashi
patent: 5805357 (1998-09-01), Omura
patent: 5835275 (1998-11-01), Takahashi et al.

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