Method of making a magnetic recording disk

Details Method of making a magnetic recording disk Method of making a magnetic recording disk

1986-11-18

1988-11-01

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

2643288, B29C 4500

Patent

active

047818794

ABSTRACT:
A magnetic recording disk comprises a disk base which is provided with a central opening and an annular recess formed on at least one side thereof between the inner peripheral edge portion surrounding the central opening and the outer peripheral edge portion along the outer periphery of the disk base, and a flexible magnetic sheet which has a shape conforming to the shape of the disk base and is bonded to the disk base over the annular recess along the inner peripheral edge portion and the outer peripheral edge portion. The disk base is formed by injection molding of plastic material using a mold having a cavity provided with a central core for forming the central opening in the disk base and an annular protrusion which is coaxial with the central core and encircles the central core on the radial outside of a pin gate or pin gates through which molten resin is injected into the cavity so that an annular groove encircling the central opening is formed coaxially with the central opening.

REFERENCES:
patent: 3880978 (1975-04-01), Apostoleris et al.
patent: 4403933 (1983-09-01), Davis et al.

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