Two-group zoom projection lens and projection display

Details Two-group zoom projection lens and projection display Two-group zoom projection lens and projection display

2006-09-14

2010-06-08

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000, C359S649000

Reexamination Certificate

active

07733576

ABSTRACT:
A two-group zoom projection lens is provided and includes: in order from a magnification side, a first lens group having a negative refractive power; and a second lens group having a positive refractive power, the second lens group including a front group and a rear group in order from the magnification side, the front group including a group having at least two positive lenses and a group having at least one negative lens in order from the magnification side, the rear group including a group having at least one negative lenses and a group having at least two positive lenses in order from the magnification side. The front group includes a negative lens having a concave surface directed toward the magnification side, the rear group includes a negative lens having a concave surface directed toward a reduction side, and the projection lens satisfies conditional expressions specified in the specification.

REFERENCES:
patent: 5781349 (1998-07-01), Sugawara
patent: 5936780 (1999-08-01), Chuang et al.
patent: 2004-271668 (2004-09-01), None

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