Title:
DIFFRACTIVE OPTICAL ELEMENT
Document Type and Number:
WIPO Patent Application WO/2018/169093
Kind Code:
A1
Abstract:
Provided is a diffractive optical element capable of further reducing zero-order diffraction light. This diffractive optical element 10 comprises a diffraction layer 15 including: a high refractive index part 11 in which a plurality of projections 11a are arranged side by side in a cross-sectional shape; and a low refractive index part 14 that has a lower refractive index than the high refractive index part 11 and that includes a recess 12 formed at least between the projections 11a. The projections 11a have a sawtooth shape or a shape that imitates a sawtooth shape by a multi-stage outline shape. An inclined plane that is inclined with respect to a sheet surface of the diffractive optical element 10, which has a sawtooth shape or a sawtooth shape imitated by a multi-stage outline shape, has a concave curved plane that is concave toward the projections 11a.
Inventors:
TOYAMA NOBUHITO (JP)
Application Number:
PCT/JP2018/010729
Publication Date:
September 20, 2018
Filing Date:
March 19, 2018
Export Citation:
Assignee:
DAINIPPON PRINTING CO LTD (JP)
International Classes:
G02B5/18
Domestic Patent References:
| WO2012018017A1 | 2012-02-09 | |||
| WO2017119400A1 | 2017-07-13 | |||
| WO2006043516A1 | 2006-04-27 | |||
| WO2015030127A1 | 2015-03-05 | |||
| WO2008126562A1 | 2008-10-23 | |||
| WO2009154072A1 | 2009-12-23 |
Foreign References:
| JP2014006950A | 2014-01-16 | |||
| JP2018036633A | 2018-03-08 | |||
| JP2006188416A | 2006-07-20 | |||
| JP2010096999A | 2010-04-30 | |||
| JP2010102008A | 2010-05-06 |
Attorney, Agent or Firm:
SHOBAYASHI Masayuki et al. (JP)
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