Electricity: measuring and testing – Magnetic – Magnetic information storage element testing
Patent
1977-10-21
1978-10-17
Corcoran, Robert J.
Electricity: measuring and testing
Magnetic
Magnetic information storage element testing
235449, 324239, 360119, G01R 3312
Patent
active
041211561
ABSTRACT:
A magnetic orientation sensor for magnetic recording media includes a transducer that writes a magnetic pattern on the recording medium and then reads it back. The reading is taken a number of times at a given location but with the magnetic flux traveling in various directions. The strength of the readback signal is used to interpret the magnetic properties of the medium, in particular a direction of orientation which is the preferred or strongest magnetic conductor. The transducer and the medium are stationary with respect to one another at each measurement. The transducer or magnetic head consists of a circular or ring-type structure having a rotating center spindle having a longitudinal bar of magnetic conductive material on the face thereof to create a magnetic field of varying orientation during the writing and reading process. Thus, the coils and most of the mass of the transducer will remain stationary while only a small portion of the mass, consisting of the spindle, rotates to cause a continual reorientation of the magnetic path through the recording medium.
REFERENCES:
patent: 2914746 (1959-11-01), James
patent: 3387377 (1968-06-01), Patton
patent: 3820012 (1974-06-01), Molyneux
Control Data Corporation
Corcoran Robert J.
McGinnis, Jr. William J.
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