Information recording medium having magnetizable hub

Details Information recording medium having magnetizable hub Information recording medium having magnetizable hub

1989-04-04

1990-07-31

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428913, 346 11, 346 76L, 3461351, 369272, 369282, B32B 300

Patent

active

049449826

ABSTRACT:
An information recording medium for writing and/or reading information by means of a laser beam comprises an information recording disc and a magnetizable hub. The information recording disc has a circular hole at its center, and the magnetizable hub is fitted into the hole of the disc. The magnetizable hub comprises a boss and a flange and has a hole at its center for insertion of a spindle. The boss of the hub has at its bottom a diameter being equal to or larger than the diameter of the circular hole of the recording disc. The magnetizable hub is pushed into the circular hole of the recording disc, whereby the hub is firmly fitted into the hole of the disc. The boss of the magnetizable hub may have an outwardly extended protrusion or raised portion at its bottom. The boss of the magnetizable hub may be divided into three or more separate portions.

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