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:
Dec. 02, 2003
Filed:
Oct. 25, 2001
Seiichi Sakai, Tokyo, JP;
Hiroshi Yamauchi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A magnetic head wear-rate measuring apparatus for measuring the rate of head wear in noncontact form arranged to be opposed to a magnetic head and to serve as a part of oscillating elements of an oscillator circuit. A magnetic resistance of a magnetic circuit at a rotational position where the magnetic head faces the magnetic sensor, changes according to the degree of extension of the magnetic head from the surface of the drum, and the change in magnetic resistance acts as a variation in oscillating frequency. A counter is supplied with a pulse of a measured oscillating frequency and produces a pulse having a pulse width up to the counting of a predetermined number of pulses. The counter output is supplied to a second counter where the number of reference clocks lying within the pulse width is counted and used as measured data.