Title:
Lighting device and biometric authentication device
Document Type and Number:
Japanese Patent JP6343972
Kind Code:
B2
Abstract:
An illumination device includes a light source provided on a surface of a substrate and configured to emit light, and a diffraction optical element having a plurality of diffraction gratings with different pitch and rotating direction, and configured to diffract the light into illumination light that illuminates an illumination region of an illuminating target. The illuminating region is larger than an area occupied by the diffraction optical element and the light source provided on the surface of the substrate.
Inventors:
Satoshi Maeda
▲浜▼ 壮一
Yukihiro Azumako
▲浜▼ 壮一
Yukihiro Azumako
Application Number:
JP2014046934A
Publication Date:
June 20, 2018
Filing Date:
March 10, 2014
Export Citation:
Assignee:
富士通株式会社
International Classes:
G06T1/00; A61B5/1171; G06V10/141
Domestic Patent References:
| JP2007033576A | ||||
| JP2013008950A | ||||
| JP2003270585A | ||||
| JP2007233282A | ||||
| JP2010049664A | ||||
| JP2004163527A |
Attorney, Agent or Firm:
Tadashige Ito
Tadahiko Ito
Takao Kato
Tadahiko Ito
Takao Kato
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