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Title:
照明装置
Document Type and Number:
Japanese Patent JP6471842
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:
Kurashige Makio
Application Number:
JP2018558255A
Publication Date:
February 20, 2019
Filing Date:
January 12, 2018
Export Citation:
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Assignee:
Dai Nippon Printing Co.,Ltd.
International Classes:
F21V14/06; B60Q1/26; F21S2/00; F21S43/20; F21V9/00; F21V14/02
Domestic Patent References:
JP201515128A
JP201061848A
JP201299284A
Foreign References:
WO2016072505A1
EP2128521A1
Attorney, Agent or Firm:
Hiroshi Shimura