Disc driving apparatus with magnetic means for preventing axial

Details Disc driving apparatus with magnetic means for preventing axial Disc driving apparatus with magnetic means for preventing axial

1991-01-29

1993-06-08

LaRoche, Eugene R.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

369264, 192 84PM, G11B 2300, G11B 2500

Patent

active

052185982

ABSTRACT:
A disc driving apparatus comprises a motor, a turntable which is rotated by a driving force of the motor and supports a disc on one side thereof, a fixed supporting portion for rotatably supporting the turntable, and magnetic means for always generating a predetermined magnetic attracting or repulsive force between the other side of the turntable and the fixed supporting portion which faces the other side of the turntable. A unidirectional urging force is always applied to the turntable by the magnetic means in the axial direction, so that even if an external vibration exists, when a force which is applied to the turntable by the vibration is equal to or less than the urging force, the turntable does not move in the axial direction. Thus, the interval between the disc supported on the turntable and a pickup does not change by the vibration, and an erroneous recording or reading of a signal can be avoided.

REFERENCES:
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patent: 4874976 (1989-10-01), Ohsawa et al.
patent: 4951277 (1990-08-01), Masunaga et al.
patent: 5050158 (1991-09-01), Kitada et al.

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