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. 11, 1995
Filed:
Jan. 19, 1993
Nobuyuki Kajita, Kashiwa, JP;
Takamasa Uejima, Abiko, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
In a rotary-magnetic-head dynamic track following device of the present invention, a coil for generating a controlling magnetic field that shifts a magnetic head along its rotation axis, a magnet for generating a constant magnetic field, a yoke section for allowing the constant magnetic field to form a closed loop (for example, an upper yoke and a lower yoke) are installed in a ring shape around the rotation axis. The lower drum also functions as a fixed drum. A head support member, which has spiral grooves formed along its outer edge section, is fixed to the bottom face of the outer circumferential wall of the upper drum. The upper drum and a rotary transformer core section are fixed to a rotary cylinder, and thus rotated together with a motor section and the head support member as one unit. This arrangement makes it possible to achieve compactness of the rotary-magnetic-head dynamic track following device as well as providing superior performances such as: a better response characteristic of the head displacement adjusting mechanism; reduction of slide resistance of the magnetic tape; and reduced power consumption.