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Optical-recording-disk

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Optical recording disk

Details

Inventors: Horigome, Shinkichi; Niihara, Toshio; Ohta, Norio; Sugita, Yutaka; Miyamura, Yoshinori; Sudo, Ryoichi; Miwa, Hiroaki; Tajima, Tetsuo;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Epstein; Henry F.
Assistant Examiner: Ryan; P. J.
Attorney, Agent or Firm: Antonelli, Terry & Wands

In an optical recording disk wherein a resin layer cured with ultraviolet radiation is provided on a surface of a transparent substrate, the present invention consists in that a material having a heat distortion temperature of at least 65.degree. C. is employed for the ultraviolet-cured resin layer. The appearance of wrinkles on a UV-cured resin surface is suppressed, whereby an optical recording disk of high carrier-to-noise ratio and long lifetime can be provided.

DETAILED DESCRIPTION An object of the present invention is to suppress the appearance of wrinkles of a UV-cured resin surface, thereby to provide an optical recording disk of high C/N ratio and long lifetime.
Various U/V-cured resin materials were studied.
As a result, it has been revealed that the materials exhibiting heat distortion temperatures of at least 65.
degree.
C.
undergo no wrinkles.
The present invention accomplishes the object by employing a material the heat distortion temperature of which is not lower than about 65.
degree.
C.
, for an ultraviolet-cured resin layer on the front surface of a transparent substrate.
These and other objects, features and advantages of the invention will become more apparent upon a reading of the following detailed specification and drawings.

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