Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Reexamination Certificate
2006-07-11
2006-07-11
Perkey, W. B. (Department: 2851)
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
C359S452000, C359S454000, C359S455000, C359S460000, C359S621000, C359S742000
Reexamination Certificate
active
07075718
ABSTRACT:
A transparent screen includes a refraction/total reflection plate in a form of a Fresnel lens, the refraction/total reflection plate having a sawtooth surface upon which light is incident and another surface via which the light exits, and an image formation/display plate for forming a projection image from the light that exits from the refraction/total reflection plate. Refraction slating surface portions each for refracting incident light towards the other surface of the refraction/total reflection plate, transmission slating surface portions each for making incident light pass therethrough, and total reflection slating surface portions each for reflecting incident light passing through one transmission slating surface portion towards the other surface of the refraction/total reflection plate being formed concentrically on the sawtooth surface of the refraction/total reflection plate.
REFERENCES:
patent: 5581407 (1996-12-01), Mitani et al.
patent: 5724182 (1998-03-01), Mitani et al.
patent: 5914809 (1999-06-01), Mitani et al.
patent: 6726859 (2004-04-01), Suzuki et al.
patent: 59-111137 (1984-06-01), None
patent: 59-119340 (1984-07-01), None
patent: 2-18540 (1990-01-01), None
patent: 5-204047 (1993-08-01), None
patent: 5-289176 (1993-11-01), None
patent: 6-160982 (1994-06-01), None
patent: 6-273852 (1994-09-01), None
patent: 2002-196413 (2002-07-01), None
Optical System of Ultral-Thin Real Projector Equipped With Refractive-Reflective Projection Optics, Shinsuke Shikama et al., Society for Information Display, 2002 International Symposium Digest of Technical Papers, vol., XXXIII, No. II, Boston, May 22-23, 2002, pp. 1250-1253.
Endo Takao
Kojima Kuniko
Shikama Shinsuke
Suzuki Hiroshi
Teramoto Kohei
Cruz Magda
Mitsubishi Denki & Kabushiki Kaisha
Perkey W. B.
LandOfFree
Transparent screen and projection 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 Transparent screen and projection display apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transparent screen and projection display apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3600160