Disc drive with integral spindle yoke
AssigneeSony Corporation
InventorsMitsuo Nishikawa, Souichi Murakami
Life of this patent
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Abstract
A disc spindle motor of the axial air-gap type includes a record disc chucking portion having a center boss with a disc support surface formed around the center boss. A magnet is arranged adjacent and beneath the disc support surface to hold a magnetic central core of the record disc against the support surface. The rotor of the spindle motor has a rotor magnet affixed to a rotor yoke and facing the stator coils. The center boss and disc support of the disc chucking portion and the rotor yoke of the rotor are all integrally formed in one piece by molding a resin, such as nylon-6, with a magnetic powder, such as iron powder.
Claims12
A disc spindle axial air-gap motor comprising:
- a spindle portion having a center boss element and a disc support element provided around the center boss element;
- a motor portion ha ving a rotor including a rotor magnet attached to a rotor yoke and a stator having stator windings arranged on a stator base said rotor magnet and stator windings having an axial air-gap therebetween to form an axial air-gap motor;
- and
- wherein said center boss element and said disc support element of the spindle portion and said rotor yoke of said rotor are integrally formed as a single molded element from a resin and magnetic powder.
A spindle motor for driving a magnetic record medium, comprising:
- a rotor having a yoke portion for supporting a magnetic recording medium, a first magnet for attracting a magnetic core of the magnetic recording medium thereto, a rotational axle affixed to a center boss of said yoke portion, and a second magnet, said first magnet being attached to a first surface of the yoke portion, said second magnet being attached to a second surface of said yoke opposite said first surface, and said yoke portion being formed of a resin mixed with a magnetic powder;
- and
- a stator for rotatably supporting said rotor, having a plurality of stator windings and a yoke portion on which said stator windings are disposed to rotate said rotor on said rotational axle, said plurality of stator windings being arranged with a predetermined clearance from said second magnet to form an axial air-gap therebetween.
Dependencies are inferred from the claim text.