Diffractive optical element and light irradiation apparatus
AssigneeDai Nippon Printing Co., Ltd.
InventorsYuichi Miyazaki, Nobuhito Toyama, Hidenori Yoshioka
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Abstract
A diffractive optical element is configured to provide desired diffracted light and is excellent in durability. The diffractive optical element shapes light from a light source, wherein the diffractive optical element is provided with a diffractive layer having a periodic structure having low refractive index portions and high refractive index portions, and the high refractive index portions of the periodic structure include one having an aspect ratio of 2 or more.
Claims12
A diffractive optical element configured to shape light from a light source,
- wherein the diffractive optical element is provided with a diffractive layer having a periodic structure comprising low refractive index portions and high refractive index portions, and the high refractive index portions of the periodic structure include one having an aspect ratio of 2 or more, and
- wherein, for the sectional shape of the diffractive layer, the convexities forming the high refractive index portions are in a stepped shape having two or more flat portions.
A diffractive optical element configured to shape light from a light source,
- wherein the diffractive optical element is provided with a diffractive layer having a periodic structure comprising low refractive index portions and high refractive index portions, and the high refractive index portions of the periodic structure include one having an aspect ratio of 2 or more,
- wherein the high refractive index portions comprise a cured product of an ionizing radiation curable resin composition, and
- wherein a storage modulus (E′) at 25° C. of the cured product of the ionizing radiation curable resin composition is 1×108 Pa or more and 5×109 Pa or less, and a ratio (tanδ(=E″/E′)) of a loss modulus (E″) at 25° C. of the cured product of the ionizing radiation curable resin composition with respect to the storage modulus (E′) is 0.3 or less.
Dependencies are inferred from the claim text.