Patents Assigned to MSC Technology Corporation
  • Patent number: 5258972
    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).
    Type: Grant
    Filed: June 25, 1990
    Date of Patent: November 2, 1993
    Assignee: MSC Technology Corporation
    Inventors: Mark S. Brasfield, Larry S. Gullman