Asymmetric erase across a rotary transformer to a rotating...

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

G - Physics

11

B

352/29.5, 352/20

G11B 5/02 (2006.01) G11B 5/024 (2006.01) G11B 5/53 (2006.01)

Patent

CA 1062803

ASYMMETRIC ERASE ACROSS A ROTARY TRANSFORMER TO A ROTATING MAGNETIC HEAD ABSTRACT OF THE DISCLOSURE The equivalent of D.C. erase in magnetic tape using a rotating head is accomplished by trans- mitting 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.

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