Hybrid lens and projection optical system including the same

Details Hybrid lens and projection optical system including the same Hybrid lens and projection optical system including the same

2006-01-31

2006-01-31

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S718000, C359S719000

Reexamination Certificate

active

06992837

ABSTRACT:
A hybrid lens and a projection optical system having the hybrid lens are provided. The projection optical system includes a hybrid lens that is positioned along an optical path between a fluorescent surface and a screen onto which light emitted from the fluorescent surface is projected to form an image. The hybrid lens includes a spherical lens and an aspherical lens formed of plastic on at least one surface of the spherical lens. Accordingly, aberration can be corrected to improve image quality.

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patent: 5016994 (1991-05-01), Braat
patent: 5272540 (1993-12-01), Hirata et al.
patent: 5309283 (1994-05-01), Kreitzer
patent: 5572277 (1996-11-01), Uzawa et al.
patent: 2280923 (1998-05-01), None
patent: 2002-107674 (2002-04-01), None
patent: WO 98/34134 (1998-08-01), None

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