Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Patent
1998-09-23
2000-04-04
Metjahic, Safet
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
359457, G03B 2160
Patent
active
060468467
ABSTRACT:
A single plate (3) is provided with a first lens structure (7) of longitudinal lenses (9) on one side. A pattern of strips (15) of a light-absorbing material is provided on the other side. The strips (15) extend parallel to the longitudinal lenses (9) in the horizontal direction when the screen is in use. The screen includes a second lens structure (19) and a diffuser on the side with the strip pattern. This vertical lens structure (19) ensures the spread of light in the horizontal direction, while the diffuser ensures the spread of light in the vertical and horizontal directions. The lenses (21) of the second lens structure (19) have a very much larger power than those of the first, horizontal lens structure (7).
REFERENCES:
patent: 2338654 (1944-01-01), Mac Neille
patent: 2618198 (1952-11-01), Luboshez
patent: 3791712 (1974-02-01), Miyagi
patent: 3830556 (1974-08-01), Bratkowski
patent: 4078854 (1978-03-01), Yano
patent: 5196960 (1993-03-01), Matsuzaki et al.
patent: 5611611 (1997-03-01), Ogino et al.
patent: 5615045 (1997-03-01), Takuma et al.
patent: 5870224 (1999-02-01), Saitoh et al.
patent: 5880887 (1999-03-01), Goto
Faller F. Brice
Mahoney Christopher E.
Metjahic Safet
U.S. Philips Corporation
LandOfFree
Image projection screen having diffuser to spread light 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 projection screen having diffuser to spread light, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image projection screen having diffuser to spread light will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-370684