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US 5,543,228 AGranted
Molded relief hologram
AssigneeDai Nippon Printing Co., Ltd.
InventorsYukio Taniguchi, Tsuyoshi Hotta, Yuko Kuwabara, Hideaki Morita, Toshikazu Segawa
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AssigneeDai Nippon Printing Co., Ltd.
InventorsYukio Taniguchi, Tsuyoshi Hotta, Yuko Kuwabara, Hideaki Morita, Toshikazu Segawa
Estimating the term…
A holographic optical element or other similar molded article using glass as a substrate is improved in the adhesion between the glass substrate and a resin layer formed thereon so that neither peeling nor change of properties will occur. A holographic optical element (4) is adapted to generate interference fringes of the same pitch as that of tracks formed on a magnetic recording disk or repeated patterns formed on an encoder by interference between two light beams emerging from two different holographic lens regions. The holographic optical element (4) includes a glass substrate (3), a radiation-cured resin layer (2) having a hologram relief pattern on the surface thereof, and a silane coupling agent layer (5) provided between the glass substrate (3) and the radiation-cured resin layer (2).
A molded article including a glass substrate and a molded form on said glass substrate, said molded form being made from an ionizing radiation curing resin composition, containing (1) an ionizing radiation curing compound, wherein said ionizing radiation curing compound comprises N-vinyl-2-pyrrolidone, tetrahydrofurfuryl acrylate, or tetrahydrofurfuryl methacrylate, and (2) an oligomer having a glass transition temperature of not lower than 40.degree. C.;
Dependencies are inferred from the claim text.