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. 19, 2002
Filed:
Oct. 21, 1999
Hirofumi Taguchi, Yokohama, JP;
Shigemitsu Higuchi, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
For providing a recording disc, on which information can be renewed by signals, such as electromagnetic waves, and further with which unnecessary vibration due to an eccentricity in center of gravity of the disc can be reduced when the disc is rotated at high rotation velocity, wherein there are positioned an antenna portion, which enables to receive information and/or electric power on the disc, and a memory chip(s) for transmitting the information received to the disc and for renewing that information. Further, for reducing the eccentricity in center of gravity of the disc, a counter balance and/or a label portion and/or the antenna portion and/or an other memory chip(s) and/or a battery are positioned so that they are in balance to the memory chip(s) on the disc.