Disc player apparatus with an improved disc clamper

Details Disc player apparatus with an improved disc clamper Disc player apparatus with an improved disc clamper

1982-07-16

1985-04-02

Stephan, Steven L.

Dynamic information storage or retrieval

With particular cabinet structure

With mechanism to place disc on a turntable

369270, G11B 1704, G11B 362

Patent

active

045091579

ABSTRACT:
A disc clamper includes a clamp member for holding a disc against a turntable and a support member for supporting the clamp member. The clamp member is provided with a permanent magnet, and the support member has a winding. The winding is coaxially arranged to the magnet. When a certain DC current is applied to the winding, the clamp member is subjected to an electromagnetic repelling force effected between the winding and the magnet. Then, the disc is fixed to the turntable by means of the electromagnetic repelling force, and the clamp member is mechanically free from the support member.

REFERENCES:
patent: 3156472 (1964-11-01), Brock
patent: 3193295 (1965-07-01), Isemura
patent: 3768815 (1973-10-01), Mathurin
patent: 3891796 (1975-06-01), Takahara et al.
patent: 3972535 (1976-08-01), Bleiman
patent: 4053161 (1977-10-01), Bleazey
patent: 4068851 (1978-01-01), Yamaura
patent: 4194743 (1980-03-01), Ohsawa et al.
patent: 4232870 (1980-11-01), Iemenschot
patent: 4306259 (1981-12-01), Saito et al.

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