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:
Apr. 19, 2022
Filed:
Apr. 26, 2019
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Toshiki Iwasaki, Tokyo, JP;
Yoshiaki Ooyari, Tokyo, JP;
Yoshimasa Ogawa, Tokyo, JP;
Jun Sato, Tokyo, JP;
DAI NIPPON PRINTING CO., LTD., Tokyo, JP;
Abstract
An aspect of the present invention provides an optical filmincluding a resin base materialand a functional layer, wherein a 5-μm square region on the front surfaceA of the optical filmis observed to have 1 or more and 50 or less depressions having any shape at least selected from a ring shape, a circular shape, and an irregular shape, when the square region is observed using an atomic force microscope after a rubber eraser abrasion test, in which the front surfaceA is rubbed 4,000 times with a rubber eraser in a reciprocating motion under a load of 500 g; the front surfaceA has a dynamic friction coefficient of 0.70 or less before the test; and the change rate of the dynamic friction coefficient of the front surfaceA between before and after the test is 35%.