Magnetic structure for suppressing magnetic cross talk among rot

Details Magnetic structure for suppressing magnetic cross talk among rot Magnetic structure for suppressing magnetic cross talk among rot

1987-07-01

1989-03-28

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Head accessory

360 84, 360 95, 36013023, G11B 510, G11B 1560

Patent

active

048169501

ABSTRACT:
A strip of easily magnetizable material of low remanence, having magnetic properties equal to or better than those of the core of the magnetic heads on a revolving headwheel of a video tape machine is provided as a magnetic shunt for each head, disposed in the neighborhood of the core gap, but spaced therefrom at a distance much greater than the gap width, for reducing the spread of stray flux when the head is used for recording and intercepting stray flux from other heads when the head is in the playback mode. Among the many ways in which the shunt can be provided are individual bridge strip mounted on the headwheel to bridge over each head laterally, a horseshoe-shaped strip covering the annular gap in which the headwheel revolves for the portions of that gap over which the tape passes, but spaced away from the tape, and strips mounted on the stationary guide drums or embedded in the headwheel periphery. The reduction and interception of stray flux is of important advantage when a tape reading head is in operation at the same time as a recording head on the same headwheel.

REFERENCES:
patent: 3683515 (1972-08-01), Kosaka
patent: 3806902 (1974-04-01), Drees et al.
patent: 4603360 (1986-07-01), Fujiki et al.
patent: 4609947 (1986-09-01), Yamagiwa et al.
patent: 4636902 (1987-01-01), Dalziel et al.

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