Lens system and projector utilizing the same

Details Lens system and projector utilizing the same Lens system and projector utilizing the same

2007-12-07

2009-02-03

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S771000, C359S800000

Reexamination Certificate

active

07486450

ABSTRACT:
A high-performance lens system including lens elements of small diameters for projecting on to a screen or the like in an enlarged fashion images from light valves such as mainly DMDs (Digital Micromirror Devices) for forming images by changing reflecting directions of light is provided.A lens system includes, sequentially in that order from a magnifying side, a first lens group which makes up a substantially afocal optical system as a whole and a second lens group having a positive refractive power as a whole, the second lens group being configured to include, sequentially in that order from a magnifying side thereof, a first sub-lens group or2alens group having a negative refractive power as a whole and a second sub-lens group or2blens group having a positive refractive power as a whole, and depending upon applications, a third lens group made up of a single positive lens element is provided in the vicinity of a light valve such as a DMD on a contracting side of the second lens group.

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Japanese Office Action (and English translation thereof) dated Oct. 21, 2008, issued in counterpart Japanese Application No. 2006-334018.
Japanese Office Action (and English translation thereof) dated Oct. 21, 2008 in related U.S. Appl. No. 11/952,303 issued for counterpart Japanese Application No. 2006-334017.
Related U.S. Appl. No. 11/952,303; Filed: Dec. 7, 2007; Inventors: Etsuro Kawakami et al; Title:Lens System and Projector Utilizing the Same.

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