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:
Nov. 18, 2014
Filed:
Sep. 17, 2009
Tsuyoshi Kashiwagi, Tokyo, JP;
Tetsuya Sadahiro, Tokyo, JP;
Hiroyuki Amemiya, Tokyo, JP;
Nobuhiko Ichikawa, Tokyo, JP;
Tsuyoshi Kashiwagi, Tokyo, JP;
Tetsuya Sadahiro, Tokyo, JP;
Hiroyuki Amemiya, Tokyo, JP;
Nobuhiko Ichikawa, Tokyo, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
Provided is an optical sheet hardly causing a change in color depending on the observation angle of an image, the optical sheet including a plurality of layers, at least one of the layers being an optical functional sheet layer including prisms arranged in parallel along a surface of the optical sheet such that light is transmittable; and light-absorbing portions arranged in parallel between the prisms in a way to absorb light, at least another one of the layers being a light diffusing material-containing layer with optical diffusing particles dispersed in a base material, and the optical sheet satisfying a relation of Nd<Ndand vd<vd, wherein Ndis a refractive index of the base material of the light diffusing material-containing layer, vdis an Abbe number thereof, NdR is a refractive index of the optical diffusing particles and vdis an Abbe number thereof.