Zoom lens and image projection apparatus having the same

Details Zoom lens and image projection apparatus having the same Zoom lens and image projection apparatus having the same

2008-01-01

2008-01-01

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C359S686000, C359S690000

Reexamination Certificate

active

07315425

ABSTRACT:
A zoom lens of the invention has three lens groups. In the zoom lens, magnification change is performed by moving only one lens group among the three lens groups, and focus adjustments is performed by moving one of a first lens group and a second lens group counted from an enlargement conjugate side among the three lens groups. In addition, the zoom lens is approximately telecentric on reduction conjugate side thereof.

REFERENCES:
patent: 5745303 (1998-04-01), Ohno
patent: 6084719 (2000-07-01), Sugawara et al.
patent: H05-313220 (1993-11-01), None
patent: 06094996 (1994-04-01), None
patent: 6-160709 (1994-06-01), None
patent: 7-333500 (1995-12-01), None
patent: H08-051248 (1996-02-01), None
patent: 2001-108900 (2001-04-01), None
patent: 2003-273456 (2003-09-01), None
patent: 2004-70306 (2004-03-01), None
A.J.Damner et al., “Coupled-defect photonic crystal vertical cavity surface emitting lasers”, Elextronics Letters, 2003, vol. 39, pp. 1323-1324.
English Abstract and English computer translated version of JP 2003-273456.
English Abstract and English computer translated version of JP H05-313220.
English Abstract and English computer translated version of JP H08-051248.

Affiliated with

Also associated with

Rating

Zoom lens and image projection apparatus having 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 Zoom lens and image projection apparatus having the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens and image projection apparatus having the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2760913