Magnetic recording media differentiation system and method with

Details Magnetic recording media differentiation system and method with Magnetic recording media differentiation system and method with

1993-03-02

1994-02-08

Messinger, Michael

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250226, 25022723, 360137, G01N 2186, G01J 350, G11B 582

Patent

active

052850773

ABSTRACT:
A system for differentiating magnetic recording media of varying shades of black comprises a controller 10, first and second amplifiers 12A, 12B, and first and second fiber optic cables 14A, 14B. The sensitivity of the first fiber optic unit is adjusted such that it detects gamma ferric oxide media but not metal particle or barium ferrite media. The sensitivity of the second unit is adjusted such that it detects both barium ferrite and gamma ferric oxide media, but not metal particle media. The controller employs binary logic to determine which type of media is being viewed by the fiber optic units.

REFERENCES:
patent: 3614453 (1971-10-01), Johnson
patent: 4095696 (1978-06-01), Sherwood
patent: 4096949 (1978-06-01), Hoover et al.
patent: 4783591 (1988-11-01), Sullivan
patent: 5021645 (1991-06-01), Satula et al.
patent: 5117101 (1992-05-01), Moore et al.

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