Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Reexamination Certificate
2006-08-22
2006-08-22
Perkey, W. B. (Department: 2851)
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
C359S460000, C359S742000, C359S831000, C353S033000, C353S038000, C353S081000
Reexamination Certificate
active
07095558
ABSTRACT:
A total reflecting prism portion is formed on an image generation source side of a Fresnel lens sheet which constitutes a rear projection type screen. The total reflecting prism portion is formed in an area in which the angle of incidence of a projection image projected from an optical part on the Fresnel lens sheet is at least about 40·. The total reflecting prism portion causes incident light to be outputted as output light at a predetermined output angle by a total reflection phenomenon after a first refraction phenomenon. A refracting prism portion is formed on an image monitoring side of the Fresnel lens sheet. The refracting prism portion is formed in an area opposed to the portion where the total reflecting prism portion is not formed. The refracting prism portion causes incident light to be outputted as output light at a predetermined output angle by a second refraction phenomenon.
REFERENCES:
patent: 4963016 (1990-10-01), Heijnemans et al.
patent: 6282034 (2001-08-01), Onishi et al.
patent: 6292295 (2001-09-01), Yamashita et al.
patent: 6804055 (2004-10-01), Peterson et al.
patent: 6822792 (2004-11-01), Goto
patent: 2005/0099687 (2005-05-01), Watanabe
patent: WO 02/27399 (2002-04-01), None
Hirata Koji
Imafuku Daisuke
Ohishi Tetsu
Yoshikawa Hiroki
Cruz Magda
Hitachi , Ltd.
Perkey W. B.
Townsend and Townsend / and Crew LLP
LandOfFree
Image display device, rear projection type screen used in... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image display device, rear projection type screen used in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image display device, rear projection type screen used in... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3679261