Rotary magnetic head device with rotary transformer having high

Details Rotary magnetic head device with rotary transformer having high Rotary magnetic head device with rotary transformer having high

1990-04-13

1992-06-30

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360107, G11B 552, G11B 2118

Patent

active

051269066

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.

REFERENCES:
patent: 3911486 (1975-10-01), Hibbard
patent: 4609960 (1986-09-01), Fujioka
National Technical Report vol. 18, No. 4, Aug. 1972 "Design of Rotary Transformer".

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