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:
Jun. 30, 1992
Filed:
Apr. 13, 1990
Hitachi, Ltd., Tokyo, JP;
Abstract
A rotary magnetic head device and a rotary transformer used therefor are disclosed. A pair of througholes, through which the starting extremity and the ending extremity of each of a plurality of coil conductors disposed on the rotor core and the stator core constituting the rotary transformer are led to the respective rear surfaces, are linked by a linking slit. Alternatively one throughhole, through which both the starting extremity and the ending extremity of each of the coil conductors are led, is divided into two throughholes by disposing therein a non-magnetic partitioning member having a thermal expansion coefficient close to that of the magnetic body within a region of 15%. In this way, the two throughholes behave magnetically as if the starting extremity and the ending extremity of each of coil conductors passed through one throughhole, so that magnetic field components produced at the starting portion and the ending portion cancel each other and that the coupling coefficient between the rotor core and the stator core is increased.