Title:
LIGHTING DEVICE, VEHICLE HEADLIGHT SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/243294
Kind Code:
A1
Abstract:
The present invention diversifies light distribution control of emitted light. The present invention provides a lighting device including a light source, a condensing unit, a liquid crystal element that is located in a focal position of the light that is condensed by the light condensing unit, a projection lens that is located in a position at which the light that has passed through the liquid crystal element can enter, a first polarization plate that is located between the light source and the liquid crystal element, a second polarization plate that is located between the liquid crystal element and the projection lens, and a diffractive optical element that is located between the light source and the liquid crystal element. The diffractive optical element has a plurality of light modulation regions that are individually capable of electrically switching between a first state in which the refractive index changes periodically or continuously and a second state in which the refractive index is substantially uniform. In the first state, a diffractive effect is produced with respect to the entering light, and each of the plurality of light modulation regions are located at a position at which the light can enter, said position being closer to the light source than the focal position.
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Inventors:
TOKO YASUO (JP)
Application Number:
PCT/JP2023/018308
Publication Date:
December 21, 2023
Filing Date:
May 16, 2023
Export Citation:
Assignee:
STANLEY ELECTRIC CO LTD (JP)
International Classes:
F21S41/64; F21S41/147; F21S41/20; F21S41/30; F21S41/63; F21V9/00; F21V9/40; F21W102/145; F21Y115/10
Foreign References:
| JP2022020973A | 2022-02-02 | |||
| JP2021173955A | 2021-11-01 | |||
| JP2018205764A | 2018-12-27 |
Attorney, Agent or Firm:
MUTSUKI PARTNERS (JP)
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