Surface identification for back-coated magnetic recording medium

Details Surface identification for back-coated magnetic recording medium Surface identification for back-coated magnetic recording medium

1989-06-02

1991-08-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356366, G02F 101

Patent

active

050380303

ABSTRACT:
When a light beam is applied to a surface of a back-coated magnetic recording medium such as a long magnetic tape, the light reflected by the recording medium surface is polarized. The angle of rotation of the plane of polarization of light reflected by the magnetic layer of the recording medium is different from the angle of rotation of the plane of polarization of light reflected by the back coating layer of the recording medium. The light reflected from the surface of the recording medium is applied to a polarizer which allows only linearly polarized light that vibrates in a predetermined direction to pass through itself. Then, the intensity level of the linearly polarized light is detected to determine whether the light was reflected from the magnetic layer or the back coating layer.

REFERENCES:
patent: 4410277 (1983-10-01), Yamamoto et al.

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