Protective cartridge for disc record

Details Protective cartridge for disc record Protective cartridge for disc record

1982-08-10

1984-10-16

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

369291, 360133, G11B 2504

Patent

active

044778945

ABSTRACT:
A protective cartridge is provided for a disc record in a disc playback/record system. The protective cartridge is provided with a compliant annular section and a central portion. A first annular magnet for use in holding the disc record against a turntable, while the turntable rotates, is positioned in the central portion. A ram which includes a second annular magnet is arranged such that its polarity is opposite to the first magnet. When the ram is lowered an engagement of the disc record is effected. That is, the second magnet repels the first magnet to cause the first magnet to hold the disc record against the turntable.

REFERENCES:
patent: 3156472 (1964-11-01), Brock
patent: 4002826 (1977-01-01), Iemenschot
patent: 4064545 (1977-12-01), Goss
patent: 4078246 (1978-03-01), Berthoux et al.
patent: 4097895 (1978-06-01), Spong
patent: 4177491 (1979-12-01), Jahn
patent: 4185308 (1980-01-01), Fujioka
patent: 4222071 (1980-09-01), Bell et al.
patent: 4286790 (1981-09-01), Siryj et al.
patent: 4409630 (1983-10-01), Saito
U.S. patent application Ser. No. 316,659, (C. W. Reno et al.) filed _Oct. 30, 1981.

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