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:
Mar. 19, 1996
Filed:
May. 18, 1994
Kenji Hasegawa, Kadoma, JP;
Hiroshi Yohda, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a magnetic head drive for a magnetic tape recorder of a helical scan system, a pair of first and second longitudinal bimorph elements fixed to a support member is connected to a flexible bridge member and a magnetic head is mounted to the bridge member. A pair of first and second electric sources supply electric voltages independently to electrodes of the first and second bimorph elements. The voltages applied to the bimorphs are controlled against a deviation from a record track in a magnetic tape to keep a protrusion quantity of the magnetic head constant for automatic tracking. In a magnetic tape recorder wherein the upper and lower drums of a rotating head scanner are fixed and the magnetic head is rotated along an elliptical orbit, the two bimorphs are controlled not only against a deviation from a record track in a magnetic tape but also to a rotation angle of the magnetic head in order to keep a protrusion quantity of the magnetic head constant.