Title:
面状照明装置
Document Type and Number:
Japanese Patent JP7250667
Kind Code:
B2
Abstract:
A planar illumination device (1) according to one embodiment comprises: a light guide plate (6); a plurality of light sources (11); one or more optical sheets (7-9); and a bottom frame (2) and a top frame (3). The light guide plate (6) receives light from a light-incident-side surface. The plurality of light sources (11) irradiate the light-incident-side surface of the light guide plate (6) with light. The one or more optical sheets (7-9) are laminated on an emission-side surface of the light guide plate (6). The bottom frame (2) and the top frame (3) accommodate the light guide plate (6), the light sources (11), and the optical sheets (7-9). One side surface on the non-light-incident side of the light guide plate (6) and the optical sheets (7-9) is provided with a gap between the side surface and the inner surface of a side wall (2b) of the bottom frame (2). The ends of the light guide plate (6) and the optical sheets (7-9) are held between an eaves part (3b) forming an opening (3a) in the top frame (3) and a floor part (2a) of the bottom frame (2). A reflective layer (6a) is formed on the one side surface of the non-light-incident-side of the light guide plate (6) provided with the gap.
Inventors:
Kazumasa Adachi
Nobuhiko Yoshigaki
Nobuhiko Yoshigaki
Application Number:
JP2019218706A
Publication Date:
April 03, 2023
Filing Date:
December 03, 2019
Export Citation:
Assignee:
MinebeaMitsumi Co., Ltd.
International Classes:
F21S2/00
Domestic Patent References:
| JP2018120793A | ||||
| JP2019129066A | ||||
| JP2017204484A |
Foreign References:
| WO2012086511A1 |
Attorney, Agent or Firm:
Toranomon Intellectual Property Office
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