Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-12-10
1994-11-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356443, G01N 2186, G01V 904
Patent
active
053692853
ABSTRACT:
A system (20) and method for identification of medium (41) inserted into an information storage drive optically determines whether the medium is cleaning medium by determining the translucency of the medium. The system includes a dual infra-red LED light source (28) having a controllable intensity as well as BOT and EOT light receivers (30, 32). The medium longitudinally extends between the light source and the light receivers. A medium identification controller (48) determines the type of medium inserted into the information storage drive by progressively ramping the intensity of the light source and determining at what effective driving signal value the light receivers actually receive light through the medium, and by comparing the effective driving signal value for each receiver with a calibrated driving signal value at which the light receiver actually receives light when no medium is inserted.
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Brittner Rodney
Fox Thomas D.
Georgis Steven P.
Sugar Robert
Allen Stephone B.
Exabyte Corporation
Nelms David C.
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