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:
Sep. 20, 2005
Filed:
Dec. 31, 2003
Hiroshi Sekiguchi, Tokyo-To, JP;
Yoshiki Yoshida, Tokyo-To, JP;
Hiroshi Sekiguchi, Tokyo-To, JP;
Yoshiki Yoshida, Tokyo-To, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a Fresnel lens sheet that can, in production using a mold, be easily released from the mold and that scarcely produces stray light upon use, and others. Each prismon the incident side of a Fresnel lens sheetis formed to have a nearly triangular cross section and has a plane of refractionthat refracts projected light S incident on this plane and a plane of total reflectionthat totally reflects, toward the viewer's side, at least part of the light refracted at the plane of refraction. Each prismis made so that a rootbetween a prismand a prismsituated next to the prism, on the plane of total reflection side of the prism(a rootdefined by the plane of refractionof one prismB and the plane of total reflectionof another prismA situated next to the prismB, on the side of the plane of refractionof the prismB) is curved toward the prismA side from the prismB side.