The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 2007
Filed:
Mar. 03, 2003
Yasumaro Toshima, Saitama, JP;
Masashi Takai, Saitama, JP;
Hideharu Nagami, Mie-ken, JP;
Kimoto Co., Ltd., Tokyo, JP;
Abstract
A light diffusive sheet of the present invention comprises a transparent polymer sheet provided with a light diffusion layeron one side and an uneven surfacehaving 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 layerincluding 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 elementof the present invention is produced by laminating a prism sheeton a light guide plateso that the prism surfaceof the prism sheetis opposed to the light-emitting surfaceof the light guide plateand laminating the light diffusive sheet on the prism sheetso 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.