Static magnetic erasing head
AssigneeSony Corporation
InventorsMakoto Saito, Kengo Matsumoto, Kiyonori Hayakawa
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Abstract
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.
Claims8
A magnetic erasing head comprising at least two magnetic poles arranged to contact a track of a traveling magnetic recording medium, the first of said poles having one magnetic polairty and engaging substantially the full width of said track, and the second of said poles being of lesser width than said first pole and engaging less than full width of said track and being of opposite polarity, said first pole providing a magnetic field sufficient to magnetize said track to saturation, and the second of said poles providing a magnetic field greater than the coercive force of said mgnetic recording medium.
Dependencies are inferred from the claim text.