Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1983-12-28
1985-05-21
Pianalto, Bernard D.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427128, 427130, H01F 1002
Patent
active
045186260
ABSTRACT:
A process for preparing a magnetic recording medium comprised of a non-magnetic support having a magnetic layer coated thereon is disclosed. The process involves continuously travelling an undried magnetic layer on a support through a means for magnetic orientation. The means is comprised of at least 5 magnets which are installed at intervals from each other over the undried magnetic layer or under the support. The magnets are positioned in such a manner that each adjacent pole of the magnets facing the magnetic layer or the reverse surface of the support has a different polarity and that the strength of the magnetic field of each adjacent magnet is gradually reduced toward the travelling direction of the magnetic layer. Further the magnets are positioned in such a manner that the line of direction of the magnetic force between adjacent magnets is parallel to the magnetic layer and in opposite directions, whereby the ferromagnetic fine particles in the magnetic layer are randomly oriented. When the particles are randomly oriented the magnetic material can be formed into magnetic recording discs which do not suffer from modulation which occurs with magnetic discs formed from magnetic material which has its magnetic particles oriented in a machine direction.
REFERENCES:
patent: 3627580 (1971-12-01), Krall
Kato Mikihiko
Kawamata Toshio
Komine Shigeo
Morita Kazuhiko
Sato Tsunehiko
Fuji Photo Film Co. , Ltd.
Pianalto Bernard D.
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