Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-12-31
1993-07-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250570, G01N 2186
Patent
active
052296202
ABSTRACT:
A method and apparatus performs detection of an edge and detection of holes or other data patterns on a tape or other magnetic or optical medium. An array of photodetectors in an integrated circuit chip senses the intensity of light illuminating the chip with the tape running between a light source and the photodetectors. The holes or the other data patterns are sensed on the tape based on a comparison between detected light intensities with a programmable reference level. In addition, areas which may normally be sensed as a hole are discarded if these areas fall within a specified tolerance.
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Nelms David C.
Shami K.
Tandberg Data A/S
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