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Patent Searching and Data


Title:
LIGHTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/158431
Kind Code:
A1
Abstract:
This lighting device is provided with a plurality of light sources (10, 20) or light-emitting surfaces, and a light guide plate (30), an end surface of which receives light from the plurality of light sources (10, 20) or light-emitting surfaces, wherein a surface in a thickness direction of the light guide plate (30) is provided with a plurality of reflective parts (31) that reflect light received by the end surface toward an irradiation position that the light guide plate (30) faces, the light guide plate (30) is provided with an observation window (32), a first percentage, which is the percentage of the area of the observation window (32) where reflective parts (31) are provided relative to the total area of the observation window (32), is 2% or more, and a second percentage, which is the percentage of an area of another portion (33) other than the observation window (32) where reflective parts (31) are provided relative to the total area of the other portion (33), is 1.2 times the first percentage or more.

Inventors:
KOBAYASHI HIROMITSU (JP)
Application Number:
PCT/JP2022/001478
Publication Date:
July 28, 2022
Filing Date:
January 17, 2022
Export Citation:
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Assignee:
AITEC SYSTEM CO LTD (JP)
International Classes:
F21S2/00; G01N21/84; G02B6/00
Domestic Patent References:
WO2018079742A12018-05-03
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