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:
Apr. 13, 1993
Filed:
Jan. 30, 1991
Kazuhiko Sato, Yamagata, JP;
Masami Kimura, Yamagata, JP;
Takayoshi Yoshida, Yamagata, JP;
Noriaki Kaneko, Yamagata, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
The rotary magnetic head apparatus of this invention exhibits an optimum transfer characteristic similar to that in the conventional apparatuses even when the number of coil turns for the magnetic head is reduced to 10 or less. This is achieved by setting the number of secondary winding turns for the rotary transformer to 16 or less and by setting the number of primary winding turns for the rotary transformer in such a way that a product of a step-up ratio--defined as the number of secondary winding turns divided by the number of primary winding turns--and the number of coil turns will be around 50. This reduction in the number of turns of coil on the magnetic head, from 20 or 25 with the conventional apparatus to less than 10, results in a substantial reduction in the cost of magnetic head and therefore the rotary magnetic head apparatus.