Process for producing magnetic hub
AssigneeMitsui Petrochemical Industries, Ltd.
InventorsTakeshi Minoda, Akira Todo, Toshio Kimura, Masayoshi Kurisu
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Abstract
A process for producing a magnetic hub for an optical disc which is fixed to the spindle of a disc drive by means of a magnetic clamp system, which process comprises positioning and setting an annular metal plate composed of a ferromagnetic substance having burrs on one side thereof produced by punching in a mold and then injecting a resin into the mold.
Claims4
A process for producing a magnetic hub for an optical disc which is fixed to a spindle of a disc drive by a magnetic clamp system, said magnetic hub having a predetermined shape including an inner diameter and an outer diameter, said process comprising
- providing a mold having a mold cavity of said predetermined shape and a center pin extending through a center of the mold cavity,
- providing a metal plate composed of ferromagnetic material, said metal plate having a first side and a second side,
- punching said metal plate on said first side, thereby producing an annular metal plate having said first and second sides, an axle hole extending therethrough and an outer periphery, said punching producing a burr on said second side of said annular metal plate,
- positioning and setting said annular metal plate in a predetermined position within said mold cavity so that said first side of said annular metal plate comes in contact with an inner surface of said mold and inserting said center pin into said axle hole of said annular metal plate,
- injecting a resin into said mold thereby filling said mold cavity with said resin, and
- recovering the molded resin from said mold cavity with said annular metal plate embedded therein.
Dependencies are inferred from the claim text.