Magnetic tape cassette having improved magnetic tape substrate a

Details Magnetic tape cassette having improved magnetic tape substrate a Magnetic tape cassette having improved magnetic tape substrate a

1994-04-04

1995-12-26

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

In container

36013021, G11B 2304, G11B 1560

Patent

active

054793114

ABSTRACT:
A magnetic tape cassette whose reliability is considerably improved by preventing triboelectrification by tape-and-guide friction. A metal tape guide for guiding the magnetic tape while in contact with the back surface of the tape. The substrate of the magnetic tape is made of polyethylene terephthalate or polyethylene naphthalate, and has a surface specific resistance R.sub.s of 10.sub.8 .OMEGA./cm.sup.2 or more. The tape guide is made of stainless steel or aluminum, and the surface roughness of the tape guide is such that the root mean square roughness value R.sub.rms, as determined by height from a reference surface, is 60 nm or lower. Also, the back surface of the tape may be provided with 30 to 400 protrusions of a height of 300 nm per 0.1 mm.sup.2.

REFERENCES:
patent: 4364988 (1982-12-01), Andoh et al.
patent: 4491891 (1985-01-01), Shiba
patent: 5026598 (1991-06-01), Koyama et al.
patent: 5098785 (1992-03-01), Yanagita et al.

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