Optical: systems and elements – Projection screen – Rear projection screen
Reexamination Certificate
2008-04-30
2010-06-01
Epps, Georgia Y (Department: 2878)
Optical: systems and elements
Projection screen
Rear projection screen
C359S743000, C359S453000, C359S457000
Reexamination Certificate
active
07729050
ABSTRACT:
In a diffusion sheet, a plurality of approximately trapezoidal columnar unit lens portions are disposed such that the long-axis directions thereof are in parallel with each other, and all the surfaces of the unit lens portions, which correspond to the long bottom segments of the approximately trapezoidal sections of the unit lens portions are disposed on a light-incident-side flat surface. Further, light absorbing portions are disposed in the grooves between adjacent unit lens portions to absorb and/or shield external light incident from a light outgoing side. In the diffusion sheet arranged as described above, light incident on the unit lens portions from a light incident side is totally reflected on the surfaces corresponding to the side segments of the approximately trapezoidal sections vertical to the long-axis direction of the unit lens portions and outgoes from the light outgoing side.
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Goto Masahiro
Katsura Yuki
Cruz Magda
Dai Nippon Printing Co. Ltd.
Epps Georgia Y
Oliff & Berridg,e PLC
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