Orientation processing device for magnetic particles on disc-sha

Details Orientation processing device for magnetic particles on disc-sha Orientation processing device for magnetic particles on disc-sha

1984-05-29

1986-04-08

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

Means applying electrical or wave energy directly to work

Radiated energy

118623, 118640, 335284, 335302, 360 86, 360135, B29C 7100

Patent

active

045809666

ABSTRACT:
A device for orienting magnetic particles contained in a magnetic layer on a disc-shaped magnetic recording medium along the circumference of the recording medium. The magnetic layer is provided on a substrate. The orientation is effected by a magnetic field developed by a pair of permanent magnets and which the recording medium traverses during rotation. The permanent magnets are individually shaped flat and arranged to oppose each other at their pole-faces which are common in polarity. A trailing edge of each magnet located with respect to relative movement of the rotating recording medium extends and aligns with the radius of the recording medium.

REFERENCES:
patent: 2711901 (1955-06-01), von Behren
patent: 2903329 (1959-09-01), Weber
patent: 3514768 (1970-05-01), Hagadorn et al.
patent: 4003336 (1977-01-01), Koester et al.
patent: 4043297 (1977-08-01), Hartmann et al.
patent: 4087843 (1978-05-01), Louis et al.
patent: 4131921 (1978-12-01), Gruczelak
patent: 4189508 (1980-02-01), Chiba et al.
patent: 4217612 (1980-08-01), Matla et al.

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