Protective cartridge for disc record
August 10, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3156472 Playback apparatus, in particular, video player, for playing round records provided with information tracks Magnetic coupling of disk file module Holder for magnetic discs Multilayer optical record Clamping device for disk-shaped memory sheets Enclosed-type magnetic disc recording and/or reproducing apparatus Sensitivity information record Optical disc changer apparatus Information signal recording and/or reproducing apparatus and a recording jacket for use therewith Patent #: 4409630 InventorAssigneeApplicationNo. 06/406883 filed on 08/10/1982US Classes:720/710, Magnetic360/133For diskExaminersPrimary: Stephan, Steven L.Attorney, Agent or FirmInternational ClassesG11B 23/03 (20060101)G11B 23/00 (20060101) G11B 17/03 (20060101) AbstractA 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.Other References
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