Projection zoom lens and projector

Details Projection zoom lens and projector Projection zoom lens and projector

2007-02-27

2007-02-27

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S691000, C359S793000

Reexamination Certificate

active

11274427

ABSTRACT:
A projection zoom lens that is suited to projector with a DMD is provided. The projection zoom lens projects, onto a screen, projection light from the DMD and comprises, in order from a screen side, a first lens group with negative refractive power and a second lens group with positive refractive power. The second lens group includes, from the DMD side, a final lens that is a positive lens, a pre-final lens that is a negative biconcave lens positioned next to the final lens, and a stop, and both surfaces of the pre-final lens are aspherical. Using the projection zoom lens, it is possible to realize the compact projector that can project bright images with high resolution that makes full use of the characteristics of the DMD.

REFERENCES:
patent: 6169636 (2001-01-01), Kreitzer
patent: 6259508 (2001-07-01), Shigematsu
patent: 6721106 (2004-04-01), Yamamoto et al.
patent: 7006300 (2006-02-01), Shinohara
patent: 7066607 (2006-06-01), Kwon
patent: 2004/0257671 (2004-12-01), Kim et al.
patent: 2002-148515 (2002-05-01), None

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