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:
Jul. 15, 1997
Filed:
Sep. 20, 1995
Tomio Kobayashi, Kanagawa, JP;
Hideo Suyama, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
A magneto-resistance effect type magnetic head having high output can be obtained as a reproduction head for a rotating drum type VTR by only providing a conventional rotary transformer with a rotor and a stator for supplying a bias current without a need for a special mechanism for transmitting a direct current. There is provided a magneto-resistance effect type magnetic head device to be mounted on a rotating drum having a bias conductor and a sense conductor, including a rotary transformer connected to the bias and sense conductors wherein an alternating current having a frequency lower than the frequency of a recording signal is applied to at least one of stator channels facing rotor channels of the rotary transformer. A current is applied to at least either the bias conductor or sense conductor at the stator side of the rotary transformer to produce a non-direct current at a terminal on the rotor side of the rotary transformer connected to the magneto-resistance effect type magnetic head only in a time zone when the magneto-resistance effect type magnetic head is not required to reproduce the recording signal and to produce a direct current at a terminal on the rotor side in a time zone when the recording signal must be reproduced.