Magnetic damping disc for improved CD player performance

Details Magnetic damping disc for improved CD player performance Magnetic damping disc for improved CD player performance

1990-06-25

1993-11-02

Levy, Stuart S.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

369283, 369286, 369263, 428 65, 430945, G11B 726, G11B 2504

Patent

active

052589722

ABSTRACT:
A disc (14,24) providing magnetic absorption and mechanical damping is provided which is for mounting near or upon the top of a Compact Disc (100) in position in a CD player. The disc includes one or more layers of material having high magnetic permeability, such as MuMetal. In a specific embodiment, a damping disc is formed of a pair of MuMetal layers on the order of 0.004 inch in thickness separated by a substantially rigid elastomer. The damping disc provides shielding and magnetic loading by absorbing magnetic fields of a player drive motor and arm servo motor to dissipate energy, thereby reducing magnetic field coupling with electronic signal components. The damping disc is mounted on top of a CD (100) and includes a magnetic shielding layer (12) and an acoustic damping layer (16).

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patent: 4672600 (1987-06-01), Balston et al.
patent: 4726007 (1988-02-01), McCormack
patent: 5063097 (1991-11-01), Hirota et al.

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