Magnetic recording medium and method of producing it

Details Magnetic recording medium and method of producing it Magnetic recording medium and method of producing it

1992-03-13

1995-11-28

Kiliman, L.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428 656, 428694T, 428694TS, 428694TP, 428694TR, 428694ST, 428694SG, 428156, 428209, 428409, 428457, 428469, 4284722, 4284723, 428550, 428613, 428640, 428650, 428699, 428702, 428900, 2041921, 2041922, 427127, 427128, 427129, 427131, 427261, 4272551, 205105, 205106, 205112, 205121, 205124, 205171, 205172, 205173, 205187, 205192, 205199, 205201, 205206, 205210, 205214, G11B 566, B32B 310, B05D 512, C25D 500

Patent

active

054706360

ABSTRACT:
A magnetic recording medium having a substrate made of aluminum or aluminum alloy and an anodic-oxide film, e.g., alumite film, formed by effecting the anodic oxidation process, wherein the surface of the alumite film has protruding portions formed in addition to micro-irregularities which are formed in response to the cell-pore structure of the alumite film and height of the protruding portions is higher than that of the micro-irregularity, and density of the protruding portions is ranging from 10.sup.2 to 10.sup.7 per one square millimeter, these protruding portions are formed by processing the alumite film in the fluorine-contained solution (e.g., hydrofluoric acid) or in solution containing one of the acid (HCl), base (NaOH) and strong-acid salt ((NH.sub.4)SO.sub.4), Cr film and magnetic film are sequentially formed on the alumite film by the sputtering process.

REFERENCES:
patent: 4689260 (1987-04-01), Briska et al.
patent: 4698251 (1987-10-01), Fukuda et al.
patent: 4761330 (1988-04-01), Tokushima et al.
patent: 5047274 (1991-09-01), Tsuya et al.
patent: 5082709 (1992-01-01), Suzuki et al.
patent: 5093173 (1992-03-01), Nakagawa et al.
patent: 5108812 (1992-04-01), Takahashi et al.

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