Optical: systems and elements – Projection screen – Rear projection screen
Reexamination Certificate
2007-08-14
2007-08-14
Perkey, W. B. (Department: 2851)
Optical: systems and elements
Projection screen
Rear projection screen
C359S456000, C359S457000, C359S459000
Reexamination Certificate
active
10404536
ABSTRACT:
To eliminate ghosts caused by retroreflection of projected light and obtain high resolution images.Fine irregularities5are randomly formed on the plane of incidence2aof a Fresnel lens sheet2with little space between them. The glossiness (Gs 60°) of the fine irregularities5formed by such a random pattern is equal or less than 35%. The fine irregularities5are in a semispherical shape, the level difference is about 10 μm, and the maximum diameter is about 50 μm. Projected light L is scattered by the fine irregularities 5 at the plane of incidence2a, subjected to vector resolution, and has its optical intensity weakened, so that retroreflection light can be prevented.
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Cruz Magda
Perkey W. B.
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