Title:
照明装置
Document Type and Number:
Japanese Patent JP7067495
Kind Code:
B2
Abstract:
A predetermined lighting pattern (E) is projected on a surface to be illuminated (U) such as a road surface, a ground surface, a floor surface, a surface below water, and a wall surface, and the lighting pattern (E) is displaced on the surface to be illuminated (U). A laser beam (L1) generated by a laser light source (110) is broadened by a magnifying lens (120) so as to generate a divergent light (L2). The divergent light is shaped by the collimation lens (130) into a parallel illumination light (L3), and the parallel illumination light is caused to be incident on an incident plane (Q) of a diffraction optical element (140) which records a hologram image. A diffracted light (L4) from the diffraction optical element (140) forms the lighting pattern (E) as a hologram reconstructed image on the surface to be illuminated (U). By translating the collimation lens (130) by a collimation-lens drive unit (150) along a movement plane (P) that is orthogonal to an optical axis (C) of the laser beam (L1), the lighting pattern (E) can be displaced on the surface to be illuminated (U).
Inventors:
Makio Kurashige
Application Number:
JP2019008513A
Publication Date:
May 16, 2022
Filing Date:
January 22, 2019
Export Citation:
Assignee:
Dai Nippon Printing Co.,Ltd.
International Classes:
B60Q1/50; F21S2/00; F21S43/20; F21V9/00; F21V14/02; F21V14/06; G02B5/32; G03H1/22
Domestic Patent References:
| JP2015132707A |
Foreign References:
| WO2016072505A1 |
Attorney, Agent or Firm:
Hiroyuki Nagai
Nakamura Yukitaka
Satoru Asakura
Yukihiro Hotta
Nakamura Yukitaka
Satoru Asakura
Yukihiro Hotta