×

CARTRIDGE FOR PICKUP

  • US 3,665,123 A
  • Filed: 05/22/1970
  • Issued: 05/23/1972
  • Est. Priority Date: 05/23/1969
  • Status: Expired due to Term
First Claim
Patent Images

1. An electromagnetic pickup cartridge comprising, in combination, a needle support mounted for vibration in accordance with sound tracks on a record engaged by a needle mounted in said support;

  • a magnetized armature carried by and extending from said support;

    two pairs of pole pieces arranged in spaced parallel relation, with each pair of pole pieces including a first pole piece and a second pole piece interconnected by a respective magnetic coil holder;

    only each first pole piece having a pole face at one end in spaced magnetic relation with said armature, said pole faces extending in perpendicular facing relation to each other;

    said armature being operatively associated with only said pole faces and terminating short of said second pole pieces; and

    respective coils embracing each of said pole pieces, the coils on each second pole piece being wound reversely with respect to the coil on the associated first pole piece and connected in series therewith;

    whereby external magnetic fLuxes are cancelled with respect to each channel including a first and second pole piece, so that high fidelity reproduction is provided in all channels of the record only by said first pole pieces and the coils thereon in accordance with vibrations of said support relative to said pole faces.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×