Rear projector

Details Rear projector Rear projector

2011-05-31

2011-05-31

Epps, Georgia Y (Department: 2878)

Optics: image projectors

Distortion compensation

For projection axis inclined to screen

C353S069000

Reexamination Certificate

active

07950806

ABSTRACT:
A rear projector for performing image projection includes: a screen and a projection optical system. The screen has a rotationally symmetric Fresnel lens. The projection optical system has at least one reflection surface formed of a rotationally asymmetric free curved surface. The projection optical system is nonaxisymmetric and makes a central principle ray incident obliquely on the screen in the image projection. The Fresnel lens has aberration that cancels out pupil aberration of the projection optical system so that principal rays of beams exiting from the Fresnel lens become substantially parallel to each other.

REFERENCES:
patent: 6779897 (2004-08-01), Konno et al.
patent: 6805447 (2004-10-01), Takeuchi
patent: 6989929 (2006-01-01), Watanabe
patent: 2004/0166258 (2004-08-01), Mau et al.
patent: 2006/0092511 (2006-05-01), Ohishi et al.
patent: 56-147140 (1981-11-01), None
patent: 2002-196413 (2002-07-01), None
patent: 2005-292666 (2005-10-01), None

Affiliated with

Also associated with

Rating

Rear projector does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2634829