Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Reexamination Certificate
2011-02-08
2011-02-08
Mahoney, Christopher (Department: 2862)
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
C359S460000
Reexamination Certificate
active
07885003
ABSTRACT:
An optical diffusing sheet is provided, which prevents deterioration in image quality which might result from warping of the sheets due to environmental changes, and is capable of, even if a substrate is broken by an accident, preventing scattering of pieces of the broken substrate. An optical diffusing sheet is used in a transmission type screen that emits imaging light projected from an incident side to an emergent side. The optical diffusing sheet includes a highly rigid substrate layer with a light-transmissibility and a high rigidity, and a plurality of layers laminated on the highly rigid substrate layer. The plurality of layers includes at least a pair of anti-scattering layers disposed on opposite sides of the highly rigid substrate layer for preventing scattering of the highly rigid substrate layer. At least one layer of the two or more layers includes an optical diffusing element that diffuses imaging light.
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Machine tranlation of JP2004-117545 published Apr. 15, 2004.
Kashiwagi Tsuyoshi
Kato Kei
Kodama Daijiro
Burr & Brown
Dai Nippon Printing Co. Ltd.
Mahoney Christopher
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