Magnetic recording medium manufacturing method

Details Magnetic recording medium manufacturing method Magnetic recording medium manufacturing method

1992-08-24

1993-12-07

Pianalto, Bernard

Coating processes

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

Pretreatment of substrate or post-treatment of coated substrate

427130, 427131, 427132, 427550, 427599, B05D 512

Patent

active

052682064

ABSTRACT:
The present invention forms non-magnetic particles in a acicular shape as dispersed in a dispersoid liquid, forms a lower non-magnetic layer by coating the above-mentioned dispersoid liquid on a continually transported non-magnetic supporting base, forms an upper magnetic layer by coating the above-mentioned magnetic coating liquid in dual layers either consecutively or at the same time while the lower layer is still in its wet state, and performs an orientation of the magnetic particles by exposing the particles to a magnetic field while the dual layers as thus formed are still in their undried state. The orientation effect is achieved by making the specific gravity of the non-magnetic particles equal to or greater than that of the magnetic particles. The orientation effect is further enhanced by making the particle size of the non-magnetic particles equal to or less than that of the magnetic particles as measured along the long axis of the magnetic particles.

REFERENCES:
patent: 4863793 (1989-09-01), Ogawa et al.
patent: 4874633 (1989-10-01), Komatsu et al.

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