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. 15, 2000
Filed:
Oct. 29, 1998
Michiya Sako, Kagoshima, JP;
Sony Corporation, Tokyo, JP;
Abstract
A magnetic-head short-circuit detector for correctly detecting an electrical short-circuit between coil terminals of a magnetic head. Terminals H.sub.X and H.sub.Y of the magnetic head are connected to the bases of a pnp-transistors P.sub.1 and P.sub.2 respectively. Current sources I.sub.1 and I.sub.2 are inserted between power supply V.sub.CC and the emitters of the transistors P.sub.1 and P.sub.2 respectively. The emitter of the transistor P.sub.1 is connected to the (-) input terminal of a comparator 1 through a resistor R.sub.1 and directly to the (+) input terminal of a comparator 2. The emitter of the transistor P.sub.2 is connected to the (+) input terminal of the comparator 1 through a resistor R.sub.2 and directly to the (-) input terminal of the comparator 2. A current source I.sub.3 is connected between the (-) input terminal of the comparator 1 and GND. A current source I.sub.4 is connected between the (input terminal of the comparator 2 and GND. Based on results of the comparison by the comparator 1 and the comparator 2, a short-circuit on the magnetic head is detected.