Method for measuring thickness of magnetic recording medium

Details Method for measuring thickness of magnetic recording medium Method for measuring thickness of magnetic recording medium

1989-06-30

1990-06-26

Pianalto, Bernard

Coating processes

Measuring, testing, or indicating

Thickness or uniformity of thickness determined

427 44, 427131, 427132, B05D 512

Patent

active

049370936

ABSTRACT:
A method for measuring the thickness of a multi-layer magnetic recording medium which provides a high accuracy and which can be used for continuous on-line monitoring of product thickness. First, first and second magnetic layers are simultaneously coated onto a running nonmagnetic support to form the recording medium. The first and second magnetic layers are made of materials having different responses to fluorescent X-rays. Then, the thickness of at least one of said first and second layers is measured by exposing the recording medium to fluorescent X-rays.

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