Method of detecting tape defects

Details Method of detecting tape defects Method of detecting tape defects

1988-11-30

1990-06-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356431, G01N 2188

Patent

active

049335669

ABSTRACT:
A method of detecting tape defects according to a light amount signal obtained from the surface of a tape by scanning the width of the tape surface with a light beam is disclosed. The light beam is caused to scan beyond the tape edges. The light amount signal is differentiated to obtain a light amount differential signal. A tape defect in the vicinity of the tape edge is detected if the light amount differential signal has a level different from a predetermined reference level or if the point in time when a change in the level of the light amount differential signal is different from a predetermined point in time.

REFERENCES:
patent: 3843890 (1974-10-01), Anthony
patent: 3988530 (1976-10-01), Ikegami
patent: 4118127 (1978-10-01), Klein

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