Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson
Static magnetic erasing head
 The present invention relates to an erasing head for a magnetic recording apparatus using a static magnetic field. The erasing head consists of a plurality of magnetic poles having surfaces which confront the recording tape. The first and second poles have polarities opposite to each other. The first pole is arranged to engage a recording track along its full width and magnetizes it to a given polarity. The second pole is arranged to engage the upper half of the track and magnetize it to the opposite polarity. Each half track is magnetized to opposite polarities so that the distortion of output signals is reduced, when the signal is reproduced by a reproducing head engaging both half tracks. 
Sony Corporation
G G
G11B G11B
inventional inventional
Kengo Makoto Kiyonori
Matsumoto Saito Hayakawa