Projection lens

Details Projection lens Projection lens

2006-03-14

2006-03-14

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S649000

Reexamination Certificate

active

07012764

ABSTRACT:
A projection lens, for enlarging and projecting a picture formed on a flat fluorescent plate of a CRT projection tube, includes: a first lens unit of a plus lens, having aspheric surfaces on both surfaces, being convex to the screen side at a central portion including an optical axis, a second lens unit of a minus lens, having aspheric surfaces on both surfaces, being concave to the screen side at a central portion including an optical axis; a third lens unit of a plus lens, having spherical surfaces on both surfaces, being convex on both sides; a fourth lens unit of a plus lens, having aspheric surfaces on both surfaces thereof, being curved in concave-like to the screen side, on a peripheral portion far from the optical axis into a radial direction; and a fifth lens unit of a minus lens, being made up with a transparent liquid, commonly serving a faceplate of the CRT projection tube and a cooling, and a meniscus lens, having a thickness being nearly equal to and at least an aspheric surface directing a concave surface thereof to the screen side.

REFERENCES:
patent: 4776681 (1988-10-01), Moskovich
patent: 4838670 (1989-06-01), Ueda et al.
patent: 5296967 (1994-03-01), Moskovich
patent: 2004/0130798 (2004-07-01), Zhang et al.
patent: 2000-081569 (2000-03-01), None

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