Title:
EXCHANGEABLE ASSEMBLY FOR RECORD DISK PLAYER PICKUP CARTRIDGE
Document Type and Number:
Japanese Patent JPS5652999
Kind Code:
A
Abstract:
A magnetic phonograph pick-up cartridge having a fixed assembly portion and a replaceable assembly portion wherein the replaceable portion includes self-contained, longitudinally-extending stylus pole pieces surrounding a pivotally mounted stylus magnet. One end portion of the magnet has a stylus-containing shank connected so that movement of the stylus by a phonograph record groove will cause a related pivotal movement of the magnet. The stylus pole pieces, which could include one or two pole piece pairs, are positioned to define a longitudinally extending pole gap. The magnet has a longitudinal dimension less than that of the pole pieces and is positioned within the pole gap. A resilient collar is attached to the stylus pole pieces and is used to pivotally mount the magnet so that movements of the stylus will alter the magnetic flux coupled from the magnet to the stylus pole pieces. Outer surfaces of the stylus pole pieces are slidably received by inner surfaces of corresponding sensing pole pieces included in the pick-up cartridge fixed portion. Each sensing pole piece has a corresponding sensing coil attached so that magnetic flux changes can be converted to electrical signals for subsequent amplification and processing. The replaceable assembly portion, in having self-contained pole pieces, allows a placing of the magnet extremely close to the stylus pole piece inner surfaces, thereby providing a sensitivity to magnetic flux changes unachievable by conventional pick-up cartridges.
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Inventors:
BENJIYAMIN BII BAUAA
Application Number:
JP10424780A
Publication Date:
May 12, 1981
Filing Date:
July 29, 1980
Export Citation:
Assignee:
BAUER IDA
International Classes:
H04R1/16; H04R11/08; H04R11/12; (IPC1-7): H04R1/18; H04R11/08