Title:
照明装置、照明装置の設計方法及び設計装置
Document Type and Number:
Japanese Patent JP7261393
Kind Code:
B2
Abstract:
An illumination device, which projects a projection pattern including information onto a projection plane, includes a light source that emits a coherent light beam, and a diffractive optical element that diffracts the coherent light beam from the light source and projects the projection pattern. The diffractive optical element has a diffraction characteristic that allow an observer who sees the projection pattern from a viewpoint position in a first line-of-sight direction based on a position and a direction of the diffractive optical element, to visually recognize the information with a predetermined size, a predetermined shape and a predetermined inclination angle.
Inventors:
Makio Kurashige
Shunpei Nishio
Nakai Toshiyuki
Shunpei Nishio
Nakai Toshiyuki
Application Number:
JP2019154088A
Publication Date:
April 20, 2023
Filing Date:
August 26, 2019
Export Citation:
Assignee:
Dai Nippon Printing Co.,Ltd.
International Classes:
F21S2/00; F21S41/20; F21S43/20; F21V5/02; F21V9/00; F21V13/12; G02B5/18; G09F13/00; G09F19/18; G09F19/22
Domestic Patent References:
| JP2017165410A | ||||
| JP2016055691A |
Foreign References:
| WO2017217420A1 | ||||
| WO2017145972A1 |
Attorney, Agent or Firm:
Hiroyuki Nagai
Nakamura Yukitaka
Satoru Asakura
Yukihiro Hotta
Nakamura Yukitaka
Satoru Asakura
Yukihiro Hotta