ApplicationNo. 06/159661 filed on 06/16/1980
US Classes:360/266.8, Magnet detail310/12, Linear360/266.7Core detail
ExaminersPrimary: Tupper, Robert S.
Attorney, Agent or Firm
International ClassesH02K 41/035 (20060101)
G11B 5/55 (20060101)
AbstractA linear actuator for a magnetic disc drive has shortened magnetic flux lines totally confined within the actuator housing whereby the actuator can be placed in closer proximity to a disc and thus reduce the size of the disc drive package. The actuator includes a generally cylindrical housing with magnets attached to the inside surface of the housing. A cylindrical bobbin having a voice coil wound on its periphery is positioned within the housing and linearly movable therein with the voice coil in close proximity to the magnets. An annular magnetic flux transmission means is attached to one face of the housing and a flux transmission plate is attached to the opposite face of the housing with the flux transmission means providing magnetic flux paths and preventing flux leakage from the housing.