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:
Sep. 05, 1989
Filed:
Jul. 13, 1988
Yoshio Sakakibara, Moriguchi, JP;
Ryo Akiyama, Hirakata, JP;
Shoichi Inatomi, Hirakata, JP;
Noriyuki Ema, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A rotation control apparatus for controlling a rotation of a recording medium in which a signal modulated in a run length limited code has been recorded in concentric or spiral information tracks at a constant linear velocity. An inversion time detecting circuit alternately detects a maximum or minimum transition interval of a reproduced digital signal from its rise transition to its fall transition, and a maximum or minimum transition interval of the reproduced digital signal from its fall transition to its rise transition, so as to thereby produce a transition interval signal corresponding to each of the detected maximum or minimum values. A motor drive circuit drives a motor in such a direction as to reduce a difference between the value of the transition interval signal and a predetermined value.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile