Lens system and projector utilizing the same

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

2007-12-13

2009-11-17

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

Afocal

C359S793000

Reexamination Certificate

active

07619833

ABSTRACT:
A high-performance lens system includes lens elements of small diameters for projecting enlarged images from light valves (mainly Digital Micromirror Devices (DMDs)) for forming images by changing reflecting directions of light. The lens system includes, sequentially in 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. Depending on the application a third lens group made up of a single positive lens element is provided in the vicinity of the light valve on a contracting side of the second lens group.

REFERENCES:
patent: 6671102 (2003-12-01), Wada
patent: 6989946 (2006-01-01), Kobayashi et al.
patent: 7390098 (2008-06-01), Wada
patent: 2008/0130142 (2008-06-01), Kawakami et al.
patent: 2008/0137211 (2008-06-01), Kawakami et al.
patent: 2008/0137212 (2008-06-01), Kawakami et al.
patent: 05-203872 (1993-08-01), None
patent: 2002-075202 (2002-03-01), None
patent: 2002-365534 (2002-12-01), None
patent: 2003-121736 (2003-04-01), None
patent: 2003-202493 (2003-07-01), None
patent: 2003-287676 (2003-10-01), None
patent: 2005-128487 (2005-05-01), None
patent: 2005-181993 (2005-07-01), None
patent: 2005-215310 (2005-08-01), None
patent: 2008-139521 (2008-06-01), None
patent: 2008-145801 (2008-06-01), None
patent: 2008-145802 (2008-06-01), None
Japanese Office Action dated Oct. 21, 2008 and English translation thereof issued in a counterpart Japanese Application.

Affiliated with

Also associated with

Rating

Lens system and projector utilizing the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lens system and projector utilizing the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lens system and projector utilizing the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4071703