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:
Nov. 09, 1993
Filed:
Nov. 13, 1990
Applicant:
Inventors:
Shigeaki Kakiwaki, Nara, JP;
Tohru Okuda, Nara, JP;
Shigemi Asai, Nara, JP;
Masaji Tsuji, Yamatokoriyama, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; B65H / ;
U.S. Cl.
CPC ...
242191 ; 242186 ; 360 7309 ; 360 7314 ;
Abstract
A magnetic recording/reproducing apparatus includes a guide roller which rotates as magnetic tape runs, and the running speed of the tape is detected on the basis of the rotation of the guide roller. The magnetic recording/reproducing apparatus further calculates a radius of a supply reel from the rotation of the guide roller and the rotation speed of the supply reel, calculates driving torque of the supply reel from the calculated result, and the supply reel is driven so that the tension of the magnetic tape is kept constant according to the calculated result.