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Optical Magnetic Tape Defect Inspector

IP.com Disclosure Number: IPCOM000096604D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Hayunga, CP: AUTHOR

Abstract

This optical device inspects magnetic tapes for defects and particularly particles such as particle 10 on the tape, for example, specks between tracks on the tape 11.

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Optical Magnetic Tape Defect Inspector

This optical device inspects magnetic tapes for defects and particularly particles such as particle 10 on the tape, for example, specks between tracks on the tape 11.

The inspecting device comprises a light source such as a small arc lamp 9. This directs light through a lens system 12 at an acute angle to the plane of the tape. The light is directed against a roller 13 for passing the tape over an inspection point and pin hole 14 shielding a photocell 15 for picking up the reflected light off the tape.

A defect or particle 10 on the surface of the tape between roller 13 and tape 11 forces a bulge 16 in the medium. This is about twenty times larger than the defect in question and this bulge scatters light away from the pin hole 14 allowing the photocell to detect the bulge.

When the tape 11 is flat, smooth and unblemished, the light is concentrated at the pin hole and on the photocell 15 to give a different signal than that of the scattered light.

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