Light modulation element and information recording medium
AssigneeDai Nippon Printing Co., Ltd.
InventorsTsuyoshi Yamauchi, Mitsuru Kitamura, Nobuko Oikawa
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Abstract
An optical member utilizing light from a point light source is enabled to visually perceive a reproduced optical image with a desired color. An optical modulation device includes an optical member having a light control part to reflect or absorb light in a predetermined wavelength and to pass through light in other than the predetermined wavelength in light in at least a visible light band, in accordance with a reproduction reference image for reproducing an original image, and a light transmissive part to pass through light in at least the visible light range including the predetermined wavelength.
Claims17
A light modulation element comprising:
- a hologram recording layer, the hologram recording layer comprising:
- a light control part configured to reflect or absorb light in a predetermined wavelength range and to pass through light in other than the predetermined wavelength range in at least a visible light range in accordance with a reproduction reference image for reproducing an original image, the light control part comprising an interference fringe;
- and
- a light transmissive part configured to pass through light in at least the visible light range including the predetermined wavelength range,
- wherein the reproduction reference image is a Fourier-transformed image of the original image, and
- the light control part and the light transmissive part are disposed adjacently in a plane direction in an alternating pattern depending on a fringe pattern of the Fourier-transformed image.
Dependencies are inferred from the claim text.