Aluminum head drum with a protective layer which smoothly and co

Details Aluminum head drum with a protective layer which smoothly and co Aluminum head drum with a protective layer which smoothly and co

1997-06-30

1999-03-16

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Head accessory

G11B 1560

Patent

active

058837698

ABSTRACT:
An aluminum head drum for use in a video cassette recorder is coated with a protective layer comprising diamond-like carbon. The protective layer of diamond-like carbon is obtained using a plasma-enhanced chemical vapor deposition method and has a thickness ranging from 0.3 .mu.m to 2.0 .mu.m. The protective layer has a varying mechanical hardness, wherein the mechanical hardness has a maximum value at a region of the protective layer coming in contact with the aluminum head drum, decreases smoothly and continuously and reaches an minimum value at a region of the protective layer coming in contact with atmosphere. Micro-Vicker's hardness of the region of the protective layers coming in contact with a video tape is 1.5-2.0 times that of the magnetic substance constituting the video tape.

REFERENCES:
patent: 5291957 (1994-03-01), Curlett
patent: 5768046 (1998-06-01), Lee

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