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:
Jan. 21, 2020
Filed:
Jan. 14, 2019
Applicant:
Keiwa Inc., Tokyo, JP;
Inventors:
Assignee:
Keiwa Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/02 (2006.01); F21V 8/00 (2006.01);
U.S. Cl.
CPC ...
G02B 5/0226 (2013.01); G02B 5/0221 (2013.01); G02B 5/0278 (2013.01); G02B 6/0051 (2013.01); G02B 6/0053 (2013.01); G02B 6/0068 (2013.01);
Abstract
A diffusion sheet includes a resin base layer that is light transmissive and a light diffusion layer provided on one surface of the resin base layer, and including titanium oxide particles, resin beads and a binder resin. The percentage by mass of the titanium oxide particle in the binder resin is 190 to 250% by mass, and the light diffusion layer has a mass per unit area of 6.0 to 7.0 g/m.