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:
Apr. 23, 1985
Filed:
Apr. 30, 1982
Atsushi Ishihara, Yokohama, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
The invention provides a disc device having a disc with a spiral data recording area, a motor for driving the disc, a head for recording data on the disc, reproducing it therefrom and erasing it thereon, a movable mechanism for radially moving the head on the disc, a positioning servo circuit for controlling and driving the movable mechanism, and a microprocessor for controlling the positioning servo circuit. A counter is included in the positioning servo circuit. The counter counts rotation synchronizing clock signals from the motor and outputs a predetermined reference position signal. In accordance with an output signal from the counter, the movable mechanism is driven at the same velocity as that at which the data recording area of the disc is moved in the movement direction of the movable mechanism.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile