Title: Moving coil pickup having a substantially square magnetic armature mounted in an air gap adjacent a square face magnetic member

Abstract: A moving coil pickup of the type having a substantially square magnetic armature mounted in an air gap defined between two opposed pole faces of magnetic members in a magnetic circuit wherein the shape of the pole faces is conformed to the shape of the armature by making at least one end portion of at least one of the magnetic members substantially square in cross-section.

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Inventors: Nakatsuka, Hisayoshi (Greve Strand, DK)

Application Number: 676350
Filing Date: 1976-04-12
Publication_date: 1979-03-20
Assignee: Ortofon Manufacturing A/S (Valby, DK)
Primary Class(es): 369/136 369/147, 369/170
Other Classes:
US Patent Ref:

2689275	Sep, 1954	Hansen	179/100.
3040136	Jun, 1962	Grado	179/100.
3230318	Jan, 1966	Engel et al.	179/100.
3679843	Jul, 1972	Cho	179/100.
3963880	Jun, 1976	Ikeda	179/100.

Other Refs: 981041000035

May, 1924	DE2
Aug, 1965	GB

Primary Examiner: Cardillo, Jr., Raymond F.
Assistant Examiner:
Attorney: Fleit & Jacobson