Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Reexamination Certificate
2005-02-25
2008-10-14
Lee, Diane I. (Department: 2851)
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
C359S456000, C359S454000, C359S460000
Reexamination Certificate
active
07436593
ABSTRACT:
Images that are bright even on the periphery of a transmissive screen are obtained by reducing reflection loss of the screen when the screen incident angle of the image light entering the upper left and right ends of the screen increases. Incident-side prisms (10), each having at least a plane-of-incidence (c) onto which light comes in, an exit face (d) from which the light that has come in from the plane-of-incidence exits after being refracted, and a refractive face (e) on which the light that has exited from the exit face is refracted and then guided to the image-viewing side of the Fresnel lens sheet (6), are provided in the range where the incident angle of the incoming light becomes equal to or greater than approximately 40 degrees.
REFERENCES:
patent: 5751478 (1998-05-01), Yoshimura et al.
patent: 6726859 (2004-04-01), Suzuki et al.
patent: 2003/0174396 (2003-09-01), Murayama et al.
patent: 2004/0047037 (2004-03-01), Peterson et al.
patent: 2005/0099687 (2005-05-01), Watanabe
Hirata Koji
Imafuku Daisuke
Ohishi Tetsu
Yoshikawa Hiroki
Cruz Magda
Hitachi , Ltd.
Lee Diane I.
McDermott Will & Emery LLP
LandOfFree
Screen, fresnel lens sheet used therefor, and image display... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Screen, fresnel lens sheet used therefor, and image display..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Screen, fresnel lens sheet used therefor, and image display... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4000020