Projection device for projecting an original image onto a screen

Details Projection device for projecting an original image onto a screen Projection device for projecting an original image onto a screen

1995-03-28

1996-09-03

Dang, Hung X.

Optical: systems and elements

Lens

With variable magnification

359634, 359726, 359736, 359794, 348744, G02B 906, G02B 1514, G02B 1700, H04N 931

Patent

active

055529380

ABSTRACT:
Disclosed is a projection optical system for projecting an original image onto a screen, including a projection lens comprising, in succession from the screen side, a first lens unit having positive refractive power, and a second lens unit having positive refractive power, and a reflecting member disposed between the first lens unit and the second lens unit of the projection lens for directing light from an illuminating light source to the original image through the second lens unit, one of a plurality of sub-lens units constituting the first lens unit being moved to thereby effect focusing.

REFERENCES:
patent: 2958258 (1960-11-01), Kelly
patent: 4806003 (1989-02-01), Mukai et al.
patent: 4936658 (1990-06-01), Tanaka et al.
patent: 5028121 (1991-07-01), Baur et al.
patent: 5054897 (1991-10-01), Ozawa
patent: 5108172 (1992-04-01), Flasck

Affiliated with

Also associated with

Rating

Projection device for projecting an original image onto a screen 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 device for projecting an original image onto a screen, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Projection device for projecting an original image onto a screen will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1955446