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US 4,358,806 AGranted
Magnetic recording and reproducing method and magnetic recording medium therefor
AssigneeFuji Photo Film Co., Ltd.
InventorYoshihiro Arai
Life of this patent
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AssigneeFuji Photo Film Co., Ltd.
InventorYoshihiro Arai
Estimating the term…
A number of blocks made of a high magnetic permeability material are arranged in parallel with a very fine pitch on a non-magnetic substrate. A number of pairs of electrodes are provided to interpose the blocks therebetween. The pairs of electrodes are electrically connected with each other. A magnetic recording layer is provided adjacent to the blocks so that a part thereof is magnetized when the block adjacent thereto is excited. A pair of metal styluses or the like are put into contact with the electrodes and an electric current modulated with information is caused to flow through the styluses to excite the block interposed therebetween and magnetize the magnetic recording layer adjacent thereto when recording information. When reproducing the recorded information, a pair of metal styluses are put into contact with the opposite ends of the block and an electric current is caused flow through the block. The recorded information is read in the form of variation in electric current flowing therethrough or voltage thereacross obtained as the styluses are moved with respect to the recording medium along the direction in which the blocks are arranged.
A magnetic recording means comprising a base made of a non-magnetic material, a plurality of first spaced apart blocks formed of material having a high permeability and arranged in parallel with a predetermined pitch on said base, a plurality of second blocks formed of electrically conductive material interposed between said first blocks so as to alternate therewith on said base, respective pairs of said second blocks being adapted to apply an electric field to a respective one of said first blocks, connecting means for electrically connecting adjacent ones of said second blocks, and a magnetic recording layer disposed on said first and second blocks and having a dimension less than a corresponding dimension of said first and second blocks so as to expose opposite ends of said first and second blocks to be free of said magnetic recording layer.
Dependencies are inferred from the claim text.