Projection lens and projection image display apparatus

Details Projection lens and projection image display apparatus Projection lens and projection image display apparatus

2005-09-20

2005-09-20

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S649000

Reexamination Certificate

active

06947222

ABSTRACT:
A projection lens, which has a first group of lenses having a negative power and a second group of lenses having a positive power, sequentially arranged from an enlargement side to a reduction side, satisfying the following conditional expressions (1) through (4), and having a field angle of about 110° or more: (1) 25.0<Fb, (2) F<0.65H, (3) 30F<|EP|, and (4) 4F<T, where Fb is an air-converted distance (mm) from a final surface at the reduction side of the lens to an image point, H is a maximum image height (mm) at the reduction side, F is a focal distance (mm) of the whole projection lens, EP is a exit pupil distance (mm), and T is an air-converted distance (mm) obtained by air-converting a gap between the first group of lenses and the second group of lenses.

REFERENCES:
patent: 5822129 (1998-10-01), Sekine
patent: 6034824 (2000-03-01), Moon
patent: 1 422 543 (2004-05-01), None
patent: 05-107469 (1993-04-01), None
patent: 09-096759 (1997-04-01), None
patent: 10-307332 (1999-11-01), None
patent: 11-305117 (1999-11-01), None
patent: 2001-021799 (2001-01-01), None
patent: 2001-42211 (2001-02-01), None
patent: 2001-042211 (2001-02-01), None
patent: 2001-166205 (2001-06-01), None
patent: 2001-324675 (2001-11-01), None
patent: 2002-031754 (2002-01-01), None
patent: 2002-107618 (2002-04-01), None
patent: 2002-131636 (2002-05-01), None
patent: 2003-5069 (2003-01-01), None
patent: 2003-015033 (2003-01-01), None
patent: 2003-057540 (2003-02-01), None

Affiliated with

Also associated with

Rating

Projection lens and projection image display apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Projection lens and projection image display apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Projection lens and projection image display apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3413948