Illumination – Edge lighted panel – Light guide
Reexamination Certificate
2007-01-02
2007-01-02
Husar, Stephen (Department: 2875)
Illumination
Edge lighted panel
Light guide
C362S622000, C362S331000, C359S599000
Reexamination Certificate
active
10376293
ABSTRACT:
A light diffusive sheet of the present invention comprises a transparent polymer sheet provided with a light diffusion layer3on one side and an uneven surface4ahaving arithmetical mean deviation of 0.5 μm or less and mean spacing of 80 μm or narrower on the opposite side. Such an uneven surface can be made by forming a backcoat layer4including a mixture of particles having particular mean diameters in a particular proportion to a binder resin on the transparent polymer sheet. An area light source element7of the present invention is produced by laminating a prism sheet6on a light guide plate5so that the prism surface61of the prism sheet6is opposed to the light-emitting surface51of the light guide plate5and laminating the light diffusive sheet on the prism sheet6so that the uneven surface (backcoat layer) of the light diffusive sheet is opposed to the surface opposite of the prism surface. The light diffusive sheet of the present invention can prevent occurrence of a rainbow-like annular pattern without deteriorating the front luminance and view angle of the area light source even when combined with a downward-facing prism sheet.
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Nagami Hideharu
Takai Masashi
Toshima Yasumaro
Husar Stephen
Kimoto & Co., Ltd.
Neils Peggy A.
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