Method for making a magnetic disk

Details Method for making a magnetic disk Method for making a magnetic disk

1992-03-24

1992-11-03

Pianalto, Bernard

Coating processes

Direct application of electrical, magnetic, wave, or...

Pretreatment of substrate or post-treatment of coated substrate

427128, 427130, 427240, 427335, 427346, 4273855, 427550, 428 64, 428694, 428900, B05D 314

Patent

active

051607611

ABSTRACT:
Information is magnetically recorded in and reproduced from a magnetic disk using a flying magnetic head. The disk is a coating type disk comprising a rigid substrate having a magnetic layer coated thereont from a magnetic coating composition of ferromagnetic submicron particles in a binder. High density recording is possible when the substrate has a surface roughness Ra of up to 0.007 .mu.m, the magnetic layer has a thickness of up to 0.5 .mu.m, a surface roughness Ra of up to 0.005 .mu.m, and a porosity of 4 to 45%.

REFERENCES:
patent: 4734810 (1988-03-01), Nakayama et al.

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