Title:
面状照明装置
Document Type and Number:
Japanese Patent JP6790035
Kind Code:
B2
Abstract:
A planar lighting device according to an embodiment has a light source, a light guide plate, and a light shielding sheet. The light guide plate has an light-incident surface on one edge surface and a light-emitting surface on one main surface. The light guide plate emits light, which is emitted by the light source and entered from the light-incident surface, from the light-emitting surface. The light guide plate further has a plurality of through-holes that are spaced apart from each other in a direction intersecting a direction in which light emitted by the light source enters into the light-incident surface. The through-holes pass through the light guide plate in a thickness direction. The light shielding sheet is disposed so as to cover a portion on the light-emitting surface between adjacent through-holes.
Inventors:
Nobuhiko Yoshigaki
Application Number:
JP2018174511A
Publication Date:
November 25, 2020
Filing Date:
September 19, 2018
Export Citation:
Assignee:
MinebeaMitsumi Co., Ltd.
International Classes:
F21S2/00; G02F1/13357
Domestic Patent References:
| JP8315621A |
Foreign References:
| WO2015178299A1 |
Attorney, Agent or Firm:
Toranomon Intellectual Property Office