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:
Aug. 08, 2006
Filed:
Jun. 18, 2002
Kazuyoshi Ebina, Kita-katsushika-gun, JP;
Takashi Abe, Satte, JP;
Masaru Miyashita, Minami-saitama-gun, JP;
Susumu Takahashi, Kashiwa, JP;
Kazuyoshi Ebina, Kita-katsushika-gun, JP;
Takashi Abe, Satte, JP;
Masaru Miyashita, Minami-saitama-gun, JP;
Susumu Takahashi, Kashiwa, JP;
Toppan Printing Co., Ltd., Tokyo, JP;
Abstract
In order to provide a dual-surface lens sheet in which a color shift is reduced and positions of unit lenses on a front surface and a back surface are easily aligned even if the unit lenses are disposed in fine pitch when used for a rear projection screen which is used for a display device using a plurality of projector as light sources, a half-column-cylindrical-convex-lens is used in a lens sheet having lens sections on front surface and a back surface such that pitch ratio for disposing the unit lenses on the front surface and the back surface is in a range of 1:2 to 1:30 and disposition directions of the lens sections are uniform.