The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 26, 1989
Filed:
Feb. 19, 1987
Applicant:
Inventors:
Shinkichi Horigome, Tachikawa, JP;
Toshio Niihara, Hachiouji, JP;
Norio Ohta, Sayama, JP;
Yutaka Sugita, Tokorozawa, JP;
Yoshinori Miyamura, Tokyo, JP;
Ryoichi Sudo, Yokosuka, JP;
Hiroaki Miwa, Fujisawa, JP;
Tetsuo Tajima, Fujisawa, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428 64 ; 428 65 ; 428693 ; 428694 ; 428695 ; 4284255 ; 428704 ; 428913 ; 430945 ; 522 96 ; 522103 ; 522113 ; 369283 ; 369284 ; 369286 ; 369288 ; 427 541 ;
Abstract
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.