公开(公告)号：US20170205562A1

公开(公告)日：2017-07-20

申请号：US15325825

申请日：2015-07-21

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Hideki KOIZUMI ,  Takeshi ITO ,  Tatsuji ONO ,  Yoshio OBATA ,  Mamoru ISHIZUKA

IPC: F21V8/00 ,  B29D11/00

CPC classification number: G02B6/0055 ,  B29D11/00663 ,  B29K2033/12 ,  G02B5/02 ,  G02B6/00 ,  G02B6/0038 ,  G02B6/0051

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.