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. 14, 1995
Filed:
Oct. 04, 1994
Shuko Watanabe, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In a current supply circuit for supplying a current to a reel-drive motor in a magnetic tape apparatus, the circuit includes: a conversion table storing a relationship between a radius of the magnetic tape wound on a reel and a target current to be supplied to the reel-drive motor, and the target current being converted to a digital command; a correction table storing a relationship between the digital command and an actual current flowing in the motor when the digital command is applied to the motor, the actual current being converted to a digital value; a command unit for outputting the digital command corresponding to the target current in accordance with the conversion table; a supply current control unit for supplying an analog current corresponding to the digital command to the motor; a first correction unit for applying first correction signal to the supply current control unit in response to the actual current flowing in the motor; and a second correction unit for supplying a second correction signal to the supply current control unit in accordance with an error to be corrected from the correction table with reference to the digital command.