Title:
OPTICAL MODULATION ELEMENT AND INFORMATION RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2019/049990
Kind Code:
A1
Abstract:
Provided is an optical modulation element which makes it possible to reproduce an optical image with a specific color other than iridescence when white light is incident, without having to provide a layer for selectively transmitting or reflecting a specific wavelength band; also provided is an information recording medium provided with such an optical modulation element. Also provided are: an optical modulation element which makes it possible to vividly reproduce a desired optical image with reduced impact of zeroth-order diffracted light; and an information recording medium provided with such an optical modulation element. This optical modulation element is provided with a factor element for reproducing an optical image by modulating the phase of incident reproduction light, the factor element having a textured surface. The maximum diffraction efficiency Dmax in a wavelength band of 380 to 780 nm in the wavelength distribution of the diffraction efficiency of first-order diffracted light and in the wavelength distribution of the diffraction efficiency of negative first-order diffracted light for the factor element forms a maximum value having a full width at half maximum (FWHM) of 200 nm or less in the wavelength distribution of the diffraction efficiency including said maximum diffraction efficiency Dmax.
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Inventors:
YAMAUCHI TSUYOSHI (JP)
KITAMURA MITSURU (JP)
SATO TOMOE (JP)
KITAMURA MITSURU (JP)
SATO TOMOE (JP)
Application Number:
PCT/JP2018/033211
Publication Date:
March 14, 2019
Filing Date:
September 07, 2018
Export Citation:
Assignee:
DAINIPPON PRINTING CO LTD (JP)
International Classes:
G03H1/02; G02B5/32; B42D25/328
Foreign References:
| JP2004318069A | 2004-11-11 | |||
| JP2001337603A | 2001-12-07 | |||
| JPH08500192A | 1996-01-09 |
Attorney, Agent or Firm:
NAGAI Hiroshi et al. (JP)
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