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:
May. 21, 2019
Filed:
Jul. 21, 2015
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Hideki Koizumi, Osaka, JP;
Takeshi Ito, Osaka, JP;
Tatsuji Ono, Osaka, JP;
Yoshio Obata, Shiga, JP;
Mamoru Ishizuka, Shiga, JP;
Abstract
A light guide member includes a reflective surface with a diffusion groove array. The diffusion groove array includes diffusion grooves arranged in the reflective surface in a length direction of the light guide member. The diffusion groove array includes, as the diffusion grooves, at least two inspection grooves and a non-inspection diffusion groove. The two inspection grooves are spaced in the length direction of the light guide member. The non-inspection diffusion groove is between the two inspection grooves. An intermediate part, in a length direction, of each of the two inspection grooves is divided by an ungrooved portion with no groove.