Method of detecting pinholes in a magnetic recording medium

Details Method of detecting pinholes in a magnetic recording medium Method of detecting pinholes in a magnetic recording medium

1979-04-16

1981-06-16

Pianalto, Bernard D.

Coating processes

Measuring, testing, or indicating

Thickness or uniformity of thickness determined

427122, 427128, B05D 512

Patent

active

042737974

ABSTRACT:
A magnetic recording medium comprising a plastic film support having a magnetic recording layer on one side is provided with a backing layer containing: (1) a white and/or light colored powder; (2) carbon black and/or graphite; and (3) a polymeric binder. The backing layer transmits more than 3% of white light at a thickness of 2 microns and has a surface electrical resistance of less than 10.sup.10 .OMEGA./cm. Pinholes and drop-out are easily detected in forming such a magnetic recording medium.

REFERENCES:
patent: 3484286 (1969-12-01), Beck
patent: 3636442 (1972-01-01), Doi
patent: 3881046 (1975-02-01), Akashi

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