Magnetic tape

Details Magnetic tape Magnetic tape

1998-10-21

2000-08-15

Pianalto, Bernard

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

427130, 427131, 427555, 428402, 428694BB, 428694BR, 428694BA, 428694BH, 428900, G11B 566

Patent

active

061033650

ABSTRACT:
A magnetic tape having formed on its backcoating layer 5 a recess 10 of prescribed shape capable of yielding an optical contrast to provide optical information with which servo tracking of data tracks on the magnetic layer is effected, the recess having a depth of 0.05 to 1 .mu.m and a width of 0.25 to 30 .mu.m, and the backcoating layer 5 having an arithmetic mean roughness Ra of 4 to 20 nm.

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