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:
Feb. 22, 1983
Filed:
Sep. 30, 1980
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The invention is related to a magnetic head loading and unloading device and includes an electromagnet having a spring loaded armature operative to load a double-sided flexible magnetic recording disc having two associated opposite magnetic heads and resiliently unloading the magnetic heads from the recording disc. A permanent magnet is connected to the armature and forms a speed sensor with an associated solenoid to sense the loading or an unloading speed of the magnetic heads. The solenoid includes an output connected to a negative input of a differential amplifier which includes a positive input comprising a command loading signal. The amplifier output is connected to a winding for exciting the electromagnet through an emitter grounded transistor.