| 摘要 |
A method of recording and then reading magnetic imprints in any of the several magnetizable areas of a magnetic storage surface by the steps of inducing magnetism in selected ones of those areas and then detecting the presence of a magnetic field at those areas by detecting in which of a number of Hall effect devices associated with those areas respectively the Hall effect is exhibited. Also disclosed are in-line and matrix magnetic readers employing Hall effect devices, and a unitary Hall effect reader and differential amplifier assembly, and a printer employing only a grid of conductors deposited on a substrate so that the conductors are in close proximity at the crossover points.
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