Magnetic tape apparatus including a circumferential surface...

Details Magnetic tape apparatus including a circumferential surface... Magnetic tape apparatus including a circumferential surface...

2007-08-14

2007-08-14

Davis, David (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Head accessory

Reexamination Certificate

active

10764641

ABSTRACT:
To lower the coefficient of static friction of the circumferential surface of the guide or drum constituting the magnetic tape apparatus. A flat portion is formed between peak portions. The peak portions and flat portion are formed so that the relationship: a′<a is satisfied, where “a” represents a distance between the ridges of the peak portions, i.e., pitch of the peak portions, and “a′” represents a bottom width of the peak portions. When this relationship is satisfied between the peak portions and the flat portion, the total area of the meniscuses formed between the magnetic tape and the peak portions can be reduced, thus making it possible to lower the coefficient of static friction.

REFERENCES:
patent: 3144521 (1964-08-01), Kihara et al.
patent: 3725606 (1973-04-01), Thompson
patent: 4257076 (1981-03-01), Shimizu et al.
patent: 5220475 (1993-06-01), Fujiki et al.
patent: 5627705 (1997-05-01), Ibaraki et al.
patent: 6411465 (2002-06-01), Obata et al.
patent: 6452744 (2002-09-01), Tamaru et al.

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