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. 22, 2026
Filed:
Nov. 20, 2024
Keiwa Incorporated, Tokyo, JP;
Akira Furuta, Tokyo, JP;
Masayuki Sukigara, Tokyo, JP;
Motohiko Okabe, Tokyo, JP;
Yoshihiro Fukui, Tokyo, JP;
Tomoko Kimura, Tokyo, JP;
KEIWA Incorporated, Tokyo, JP;
Abstract
A light-diffusing sheet includes a plurality of depressed portions formed in an approximately inverted polygonal pyramid on at least a first surface. Ridgelines that partition the plurality of depressed portions have a depressed shape between intersections of the ridgelines with respect to straight lines that connect the intersections. When an array pitch of the plurality of depressed portions is denoted by P and a dimension occupied by a curved portion of a vertex of each of the ridgelines in an array direction of the plurality of depressed portions is denoted by Wr, a ratio Wr/P is 0.3 or lower. A maximum height difference d between the straight lines connecting the intersections of the ridgelines and the ridgelines is 1 μm or more and 10 μm or less. The plurality of depressed portions include a depressed portion of which a vertex of the approximately inverted polygonal pyramid is formed in a linear shape.