Stable disc unit having reduced thickness

Details Stable disc unit having reduced thickness Stable disc unit having reduced thickness

1990-01-16

1992-07-07

Severin, David J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360 9912, 369270, G11B 5012

Patent

active

051288184

ABSTRACT:
A disc drive unit for rotating a data storage disc such as an optical disc or a magnetic disc comprising a turntable for supporting and rotating the disc, and a motor for rotating the turntable. The turntable also functions as a rotor of the motor. At least one driving magnet is mounted on the turntable in opposing relationship with at least one coil of the motor. At least one attraction magnet for securely holding the disc in position on the turntable is securely mounted thereon. One yoke functions as yokes, each of which must be provided for each of two kinds of magnets. When the turntable is made of a plastic, at least one attraction magnet and/or at least one driving magnet is defined by partially magnetizing the turntable at at least one predetermined region thereof. The turntable is securely attached to the bearings so that it rotates about a shaft having one end securely fixed to a stationary portion of the motor. When rotating the disc, one of the bearings is used as a member for securely holding the disc in position on the turntable.

REFERENCES:
patent: 4737870 (1988-04-01), Okita
patent: 4831474 (1989-05-01), Kumegai
patent: 4845578 (1989-07-01), Kumagai
patent: 4874976 (1989-10-01), Ohsawa et al.

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