The Infrared Transparency of Magnetic Tracks

The author has discovered that magnetic tracks are substantially transparent to infrared light. Utilizing the infrared sensitivity of the lead-sulfide photoconductive cell, it is shown that excellent reproduction of an optical track can be achieved even though it is completely covered by a magnetic stripe. By thus eliminating the need for half-width stripes, superior magnetic recording quality is obtained while avoiding most of the drawbacks of combined magnetic and optical tracks on composite prints. Potential advantages and applications of the discovery are discussed, and avenues of research for further improvement are pointed out.

Print ISSN

0361-4573

Published

1957-09

Content type

Original Research

DOI

10.5594/J11206