Title:
LIGHT GUIDE, ILLUMINATION DEVICE, AND CONTACT-TYPE IMAGE SENSOR
Document Type and Number:
WIPO Patent Application WO/2024/013899
Kind Code:
A1
Abstract:
This light guide (22) reflects at an inner surface thereof incident light from an end surface (22a) thereof while transmitting the light in a longitudinal direction and emits the light from a light emission surface (22b) thereof. The light guide (22) comprises: a light reflection surface (22c) that substantially faces the light emission surface (22b); and a plurality of diffusion structures (26) that are provided to the light reflection surface (22c) and that are for diffusing and reflecting the light. When the length of each diffusion structure (26) in a direction perpendicular to the longitudinal direction is defined as Wr and the length of the light reflection surface (22c) in the direction perpendicular to the longitudinal direction is defined as Wp, Wr < Wp.
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Inventors:
ABOSHI KAZUTAKA (JP)
KITTAKA SHIGEO (JP)
ISHIMARU TAKESHI (JP)
HOSHINA KAZUYA (JP)
KITTAKA SHIGEO (JP)
ISHIMARU TAKESHI (JP)
HOSHINA KAZUYA (JP)
Application Number:
PCT/JP2022/027602
Publication Date:
January 18, 2024
Filing Date:
July 13, 2022
Export Citation:
Assignee:
NIPPON SHEET GLASS CO LTD (JP)
International Classes:
F21V33/00; F21V8/00
Domestic Patent References:
| WO2006120932A1 | 2006-11-16 |
Foreign References:
| JP2010147859A | 2010-07-01 | |||
| JP2020065226A | 2020-04-23 |
Attorney, Agent or Firm:
MORISHITA Sakaki (JP)
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