Asymmetric erase across a rotary transformer to a rotating magne

Details Asymmetric erase across a rotary transformer to a rotating magne Asymmetric erase across a rotary transformer to a rotating magne

1975-06-06

1977-01-25

Lucas, Jay P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

G11B 502

Patent

active

040054829

ABSTRACT:
The equivalent of D.C. erase in magnetic tape using a rotating head is accomplished by transmitting a time asymmetric square wave across a rotary transformer to the rotating head. The time asymmetry of the square wave in combination with passage of the square waveform across the rotary transformer creates in the rotating head an erase current asymmetric in amplitude about an average value. The short interval of the square wave has a large amplitude in one direction and the long interval portion of the square wave has a short amplitude in the opposite direction. This current signal in the head produces alternately a large flux bubble above the head and a small flux bubble above the head. By maintaining the relative head to tape speed such that the large flux bubble always overlaps the small flux bubble, the tape can be D.C. erased by an asymmetric waveform. A double-ended driving circuit and a single-ended driving circuit are shown for driving across a rotary transformer to the rotating head with the asymmetric waveform.

REFERENCES:
patent: 3276032 (1966-09-01), Ordower
patent: 3504116 (1970-03-01), Sato
patent: 3852812 (1974-12-01), Reisfeld
patent: 3900894 (1975-08-01), Aziz
patent: 3911477 (1975-10-01), Lackner

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