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:
Jul. 16, 1991
Filed:
May. 25, 1988
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic head is provided in a tape transport path along which a magnetic tape is transported from one reel directly to another reel. In order to record or reproduce data to or from the magnetic tape with the magnetic head while the magnetic tape travels, it is necessary to stabilize a tape velocity at the magnetic head position to a desired velocity. The tape velocity at the magnetic head position is determined based on tape velocities at the respective reel positions, a tape path length from the head to one reel and a tape path length from the head to the other reel, and a closed loop control is effected by using the tape velocity at the magnetic head position to match the tape velocity to a desired velocity.