Disc type recording medium

Abstract

Abstract PURPOSE:To obtain a disc type recording medium having surface structure faithful to the information signal by covering the stamper surface with the liquid resin of a specific ultraviolet-curing type resin, then press-fixing a substrate consisting of a tansparent plate, and irradiating ultraviolet rays thereby curing the same. CONSTITUTION:This is made by adding additives such as a defoaming agent, a wetting agent, a thermoplastic resin, etc. to the ultraviolet-curing type liquid resin 4 contg. 80pts.wt. the 2,2-bis (4-acryloyloxy polyethylene oxyphenyl) propane expressed by the formula, 20pts.wt. N-vinyl pyrolidone and 3pts.wt. benzoin isobutylether, wherein the stamper surface applied with the information signal is coated thereon, thereafter a transparent substrate 3 of a copolymer of vinyl chloride and vinyl acetate or the like is press-fixed thereto and ultraviolet rays are irradiated through the substrate 3, whereby it is cured. The recording medium obtained by this method has high adhesive strength between the substrate 3 and the cured resin 4, and is easy to separate the stamper surface and the resin layer 4. A metallig layer 5, a dielectric layer 6 and an oil layer 7 are laminated in order on the layer 4, whereby the disc type recording medium formed faithfully with signal bits 1 is obtained.

Inventors

• 👤 Yoshinobu Murakami
• 👤 Akitake Ito
• 👤 Toshiaki Kashihara

Bibliographic Details