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:
Oct. 14, 2025
Filed:
Oct. 26, 2020
Sumitomo Bakelite Co., Ltd., Tokyo, JP;
Satoshi Nishino, Tokyo, JP;
Hiroshi Oya, Tokyo, JP;
SUMITOMO BAKELITE CO., LTD., Tokyo, JP;
Abstract
An optical sheetof the present invention includes a laminate including a polarizing layercontaining at least one kind of a light absorbing agent and having a polarizing function, and a protective layerlaminated on the polarizing layer, in which in the polarizing layer, a value of a* is 0 or more and 30 or less and a value of b* is 0 or more and 30 or less in an L*a*b* color system defined by JIS Z 8781-4, and in the optical sheet, a size of a Q Blue value defined by Australian Standard Australia/New Zealand Standard 1067-2016 is 0.70 or more. Thus, even when the optical sheet is toned to brown, blue light can be distinguished with excellent distinguishability.