Magnetic recording medium manufacturing method and manufacturing

Details Magnetic recording medium manufacturing method and manufacturing Magnetic recording medium manufacturing method and manufacturing

1993-09-17

1997-01-14

Kiliman, Leszek

Coating processes

Magnetic base or coating

427128, 427131, 427132, 427600, 2041922, 428694TP, 428694TR, B05D 512

Patent

active

055937233

ABSTRACT:
The present invention is directed to methods and apparatus for preparing a magnetic recording medium having a nonmagnetic substrate layer, a back-coat layer containing a metal or semi-metal which has been deposited in a vacuum on one surface of the substrate, a magnetic layer which has been deposited in a vacuum on the other surface of the substrate, and an optional top-coat layer which has been sprayed in a vacuum onto the magnetic layer. A quantity of oxygen is introduced during depositing of the back-coat layer to obtain a surface resistance of 5 to 10.sup.5 ohms.

REFERENCES:
patent: 4824724 (1989-04-01), Ueda
Patent Abstract of Japan, vol. 10, No. 45 (P-430) 21 Feb. 1986 & JP-A-60 191 435 (Hitachi Maxell).
Patent Abstract of Japan, vol. 7, No. 57 (P-510) 28 Oct. 1986 & JP-A-61 126 633 (Matsushita Electric).
Patent Abstract of Japan, vol. 9, No. 207 (P-382) 24 Aug. 1985 & JP-A-60 069 821 (Hitachi Condenser).
Patent Abstract of Japan, vol. 7, No. 57 (P-181) 9 Mar. 1983 & JP-A-57 203 230 (Hitachi Maxell).

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