Optical: systems and elements – Projection screen – Rear projection screen
Reexamination Certificate
2005-11-18
2008-10-21
Mahoney, Christopher (Department: 2862)
Optical: systems and elements
Projection screen
Rear projection screen
C359S742000
Reexamination Certificate
active
07440186
ABSTRACT:
The present invention provides a technology suitable for shortening a depth of a image display apparatus while obtaining a picture of high quality. According to the invention, a total reflection prism portion is provided on a side of a Fresnel lens sheet toward a picture source. The total reflection prism portion reflects an incident light to a direction toward an optic axial center of the Fresnel lens sheet to have the same outgoing. On the other hand, a first refractive prism portion, by which light of a predetermined incident angle or less is refracted to outgo to a direction along an optical axis of the Fresnel lens sheet, and a second refractive prism portion, by which light reflected to the direction toward the optic axial center of the Fresnel lens sheet is changed to the direction along the optical axis.
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Hirata Koji
Imafuku Daisuke
Ohishi Tetsu
Yoshikawa Hiroki
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Mahoney Christopher
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