Device for recording information on or reading information from

Details Device for recording information on or reading information from Device for recording information on or reading information from

1987-09-21

1989-04-18

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

360 86, 360 9912, G11B 1702, G11B 2504, G01D 1532

Patent

active

048233374

ABSTRACT:
Clamping device (21) for clamping an optical disc on a turntable comprises a disc-pressure means (23), a support (5) for the disc-pressure means, which support is movable between an operating position and a rest position, and a permanent-magnet system comprising a first axially magnetized annular magnet (31) and a second axially magnetized magnet (29) secured to the support and to the disc-operating means respectively. In the operating position of the support the disc-pressure means is pressed against the disc on the turntable by magnetic force and the disc-pressure means is freely rotatable relative to the support. The permanent magnets are positioned coaxially relative to each other, a radial air gap (33) being formed between the first magnet (31) and the second magnet (29) in the operating position of the support.

REFERENCES:
patent: 4232870 (1980-11-01), Iemenschot
patent: 4509157 (1985-04-01), Morinaga

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