Title:
OPTICAL ELEMENT AND LIGHT SOURCE DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/218106
Kind Code:
A1
Abstract:
Provided are an optical element and a light source device which are small in size and light in weight and can expand a light irradiation range. The optical element comprises: a light guide section (11) having a light incident surface (11a) on which light is incident and a light extraction surface (11b) which is reached by the light; a volume phase holographic grating (13) provided on the light extraction surface (11b); and a diffraction grating section (12) provided on the volume phase holographic grating (13).
Inventors:
OGATA YOICHI (JP)
Application Number:
PCT/JP2020/016527
Publication Date:
October 29, 2020
Filing Date:
April 15, 2020
Export Citation:
Assignee:
KOITO MFG CO LTD (JP)
International Classes:
G02B5/32; F21V8/00; F21V9/00; G02B5/18; G02B27/44
Foreign References:
| JP2003222727A | 2003-08-08 | |||
| JPH01303482A | 1989-12-07 | |||
| JP2003014914A | 2003-01-15 | |||
| JP2003270585A | 2003-09-25 | |||
| JPH06118864A | 1994-04-28 | |||
| JPH08286016A | 1996-11-01 | |||
| JPS6319602A | 1988-01-27 | |||
| JPH01237935A | 1989-09-22 |
Attorney, Agent or Firm:
FUJIOKA, Takahiro (JP)
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