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:
Aug. 25, 1987
Filed:
Jul. 05, 1984
Shigeki Ishikawa, Nagoya, JP;
Satoshi Furukawa, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Aichi, JP;
Abstract
An apparatus for driving a magnetic disk for information storage and retrieval, comprising a battery for supplying electric power to a first actuator for rotating the magnetic disk, and to a second actuator for moving a magnetic head across a surface of the magnetic disk and energizing the head to write information on and read the information from the magnetic disk. The apparatus further comprising a detector for sensing a voltage level of the battery, and generating a voltage-drop signal when the voltage level of the battery has fallen below a preset limit. A control unit is provided for controlling the first and second actuators. The control unit is responsive to the voltage-drop signal to inhibit the starting of an access to the magnetic disk, or inhibit the operation of the first actuator.