Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Reexamination Certificate
2007-05-22
2007-05-22
Mahoney, Christopher (Department: 2851)
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
C359S460000
Reexamination Certificate
active
11325521
ABSTRACT:
A screen for use in a projection-type image display apparatus having an image displaying element which includes a plurality of pixels for modulating light from a light source so as to form an enlarged picture on the screen. The screen includes a Fresnel lens sheet having Fresnel lenses on a light emission side, a first sheet disposed on the light emission side of the Fresnel lens sheet, and a second sheet disposed on a light emission side of the first sheet and adhered thereto. The first sheet includes a plurality of lenticular lenses formed on a light incident side which extend in a longitudinal direction and are arranged in a horizontal direction, with light passing window portions being formed at positions opposing the lenticular lenses and with light absorbing portions provided therebetween. The second sheet includes a light scattering element therein.
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“Trikeps White Series, No. 136, New Edition, Liquid Crystal Video Projector Technology” edited by Tadashi Sasaki, Shinji Morozumi; “Chapter 5, Development of Screen (Rear-Type)” pp. 113-130, and “Section 4 Designing of Optic System” pp. 141-170, and English translation of 1.2 Double-Sheet Type Screen”.
Hirata Koji
Inaoka Shigeru
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Mahoney Christopher
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