Prism sheet having concave pentagonal
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jul 8, 2008
Grant Date -
May 24, 2007
app pub date -
Jul 30, 2004
filing date -
Jul 31, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A prism sheet having a concave pentagonal structure is disclosed. The prism sheet comprises a base layer, and a prism array disposed on and supported by the base layer. The prism array is composed of a plurality of prisms aligned in parallel and one beside the other. The transversal cross-section of each prism has a shape of concave pentagon, which is symmetrical about a vertical line passing the apex. The interior angle .alpha. of the apex is 30.degree..ltoreq..alpha..ltoreq.120.degree., the exterior angle .beta. formed by the upper slant side and the lower slant side is .beta.<180.degree., the interior angle .gamma. of the lower vertex formed by the lower slant side and the base is 5.degree..ltoreq..gamma..ltoreq.85.degree. and the length w of the base is 30 .mu.m.ltoreq.w.ltoreq.100 .mu.m. Preferably, the interior angle .alpha. of the apex may be 40.degree..ltoreq..alpha..ltoreq.100.degree., the exterior angle .beta. formed by the upper slant side and the lower slant side may be 160.degree..ltoreq..beta..ltoreq.179.degree., and the interior angle .gamma. of the lower vertex formed by the lower slant side and the base may be 30.degree..ltoreq..gamma..ltoreq.60.degree.. Preferably, the length w of the base may be 40 .mu.m.ltoreq.w.ltoreq.60 .mu.m.
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