Display apparatus

Optics: image projectors – Cabinet encloses projector and one side of screen

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

353 38, 359448, 359457, G03B 2122

Patent

active

052086208

ABSTRACT:
A display apparatus comprises a projecting device for projecting an image, with the projecting device having a projection optical system having a limited pupil diameter and screen device arranged at a position where an image is substantially projected by the projecting device. The screen device has at least two sheets in each of which a number of prisms extending like a straight line or a curve are formed on the surface on the side opposite to the projecting device. Each of the prisms has an effective portion for allowing a light flux from the projecting device to be emitted in a predetermined direction and a non-effective portion which does not contribute to the emission of the light flux in the predetermined direction, and wherein the non-effective portions of another one or a plurality of the other sheets among the plurality of sheets excluding the sheet arranged at the nearest position on the projecting device side are formed so as to have an almost intermediate angle between the angle of a principal ray when a light flux from the projecting device progresses in the sheets and the emission angle of the principal ray when it is emitted from effective surfaces of the prisms of the sheets.

REFERENCES:
patent: 2441747 (1948-05-01), Beshgetoor
patent: 2510344 (1950-06-01), Law
patent: 3848980 (1974-11-01), Plummer
patent: 3972593 (1976-08-01), Appledorn et al.
patent: 3982822 (1976-09-01), Conder et al.
patent: 4076384 (1978-02-01), Deml et al.
patent: 4147408 (1979-04-01), Plummer
patent: 4152047 (1979-05-01), Inoue
patent: 4173399 (1979-11-01), Yevick
patent: 4374609 (1983-02-01), Lange
patent: 4391495 (1983-07-01), Mazurkewitz
patent: 4439027 (1984-03-01), Shioda et al.
patent: 4458993 (1984-07-01), Kempf
patent: 4468092 (1984-08-01), Inoue et al.
patent: 4482206 (1984-11-01), Van Breeman
patent: 4509822 (1985-04-01), Clausen et al.
patent: 4512631 (1985-04-01), Van Breeman
patent: 4525029 (1985-06-01), Inoue et al.
patent: 4550977 (1985-11-01), Inoue et al.
patent: 4666248 (1987-05-01), van de Ven
patent: 4674836 (1987-06-01), Yata et al.
patent: 4701020 (1987-08-01), Bradley, Jr.
patent: 4708435 (1987-11-01), Yata et al.
patent: 4721361 (1988-01-01), van de Ven
patent: 4725134 (1988-02-01), Ogino
patent: 4741613 (1988-05-01), Vanderwerf
patent: 4756603 (1988-06-01), Ohtani
patent: 4919518 (1990-04-01), Ogino et al.
patent: 4963016 (1990-10-01), Heijnemans et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

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 Display apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Display apparatus will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1978208

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.