Production method and production apparatus for magnetic...

Coating processes – Magnetic base or coating

Reexamination Certificate

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Details

C427S129000, C427S130000, C427S131000, C118S715000

Reexamination Certificate

active

10791712

ABSTRACT:
A production method and a production apparatus for a magnetic recording medium, which enable the efficient production of a discrete type magnetic recording medium, while reliably preventing any deterioration of the partitioned recording elements. The magnetic recording medium production apparatus includes: recording layer processing device, which by forming a plurality of grooves, with a spacing therebetween in a planar direction, in an intermediate product of a magnetic recording medium comprising a continuous recording layer, partitions the continuous recording layer into a plurality of partitioned recording elements; non-magnetic body filling device for filling the grooves between the partitioned recording elements with a non-magnetic body; smoothing device for smoothing the surface of the partitioned recording elements and the non-magnetic body; protective layer formation device for forming a protective layer on the partitioned recording elements and the non-magnetic body; and vacuum retention device which houses the recording layer processing device, the non-magnetic body filling device, the smoothing device, and the protective layer formation device, and maintains the environment surrounding the intermediate product in a state of vacuum.

REFERENCES:
patent: 2001/0020516 (2001-09-01), Khan et al.
patent: 2005/0147793 (2005-07-01), Kruger et al.
patent: 2005/0167770 (2005-08-01), Fukuzawa et al.
patent: A-3-40219 (1991-02-01), None
patent: A 9-97419 (1997-04-01), None
patent: A 2000-91290 (2000-03-01), None
patent: A-2000-268338 (2000-09-01), None
patent: A 2000-322710 (2000-11-01), None
patent: A-2001-216633 (2001-08-01), None
patent: A 2001-323381 (2001-11-01), None
patent: A-2002-523852 (2002-07-01), None

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