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US 6,807,028 B1Granted
Core center for magnetic disk
AssigneeFuji Photo Film Co., Ltd.
InventorKengo Oishi
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AssigneeFuji Photo Film Co., Ltd.
InventorKengo Oishi
Estimating the term…
Stable high speed rotation of magnetic recording media is obtained by improving the manufacturing accuracy of a step portion formed in a center core for a magnetic disc between a standardizing surface portion that abuts a spindle to perform standardizing positioning, and an attraction surface portion that approaches a magnet and is attracted thereby. The center core consists of a standardizing surface portion that performs standardizing positioning in its central portion, an attraction surface portion that faces a magnet at a different height than the standardizing surface portion via a step portion, and a collar portion that is fixed to the magnetic recording media at the outer peripheral portion thereof. The step portion between the standardizing surface portion and the attraction surface portion is formed to be a multiple step drawn form.
A center core for a magnetic disc which is held by the magnetic attraction force of a magnet provided at the tip of a spindle to which said spindle transmits a rotational driving force comprising:
A center core for a magnetic disc which is held by the magnetic attraction force of a magnet provided at the tip of a spindle to which said spindle transmits a rotational driving force comprising:
A center core for a magnetic disc which is held by the magnetic attraction force of a magnet provided at the tip of a spindle to which said spindle transmits a rotational driving force comprising:
Dependencies are inferred from the claim text.