Magnetic transducer

专利名称：Magnetic transducer发明人：SMITH JAMES T.申请号：US74553358申请日：19580630公开号：US3098998A公开日：19630723

摘要：850,510. Sensing records. INTERNATIONAL BUSINESS MACHINES

CORPORATION. June 30, 1959 [June 30, 1958], No. 22425/59. Addition to 838,352. Class106 (1). [Also in Group XXXVI] The parent Specification describes a means for sensingmagnetic marks on statistical records or the like using the photo-magneto-electric effectof semi-conductors, a mark being detected by the voltage it produces across a layer ofsemi-conductor where it is illuminated with a lamp. In this invention the semi-conductor issubjected to irradiation with a stream of electrons instead of with light. A cathode-raytube is used as shown in Fig. 2, the semi-conductor layer 40 either forming the end wall ofthe tube or being placed on the inner side of it. Conductors in the form of four arcuatestrips 44 are applied to the edges of the layer 40 and opposite pairs are connected tocircuits 50, 52. The record card 54 is placed near the layer and the beam 28 is controlledto sweep out successive horizontal lines covering the area of the card. When the beamregisters with a magnetic mark on the card voltages appear on one or the other of thepairs of conductors 44. Sensing characters or digital magnetic records.- The apparatus ofFig. 3 is shown sensing characters printed in magnetic ink on a tape 56. The cathode-raytube has, on the inside of the end wall, four strips of semi-conductor 81, 82, 83, 84 eachwith a pair of conductors 89. The electron beam 68 is arranged to be continuously fanned

out in a horizontal line across the four semi-conductor strips. The beam is moved

vertically to scan the whole character, output signals being derived from the four strips inaccordance with the area of the character registering with the strip at any particularposition. The character sensed may be identified from these signals by circuitry notdescribed. This apparatus can also be used to sense magnetic bits written serially in fourtracks.

申请人：INTERNATIONAL BUSINESS MACHINES CORPORATION

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