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:
Mar. 22, 1988
Filed:
Aug. 08, 1986
Nobuyuki Fujimoto, Odawara, JP;
Shinichi Abe, Kanagawa, JP;
Yoshito Tsunoda, Mitaka, JP;
Kazuo Shigematsu, Saitama, JP;
Yasunori Kanazawa, Hachiouji, JP;
Toshinori Sugiyama, Ibaragi, JP;
Tetsurou Ikegaki, Toride, JP;
Hitachi Maxell, Ltd., Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An information recording disc is provided with a magnetic attracting member in the form of metal piece or magnetic material which serves for attracting a disc member for recording, in particular, for optical recording and reproducing of information, to a spindle of a recording and reproducing apparatus. The magnetic attracting member is held in the space of a holder which is fixedly secured to the disc without the magnetic attracting member being fixedly secured to the disc. This arrangement enables a magnetic clamping of the disc member which provides for a decrease of retardation and is suitable for miniaturization of the apparatus.