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:
Apr. 09, 1985
Filed:
May. 03, 1983
Applicant:
Inventors:
Shigemasa Yoshida, Kanagawa, JP;
Ichiro Araki, Kanagawa, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 78 ;
Abstract
A detector for the moving velocity of a magnetic head of a magnetic disc memory device by electrically processing a position signal of the magnetic head, which includes a circuit for differentiating the position signal, means for rectifying the differentiating circuit, a circuit for sampling-hold of the rectified signal, a phase-shifter for delaying the position signal and means for generating a timing pulse signal to determine the timing for sampling, with the phase delaying characteristic of the transfer function of the differentiating circuit and the phase-shifting circuit being substantially coincided.