Dynamic information storage or retrieval – Specific detail of information handling portion of system – Mechanical modification or sensing of storage medium
Patent
1979-07-30
1981-02-10
Stephan, Steven L.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Mechanical modification or sensing of storage medium
369146, 369172, G11B 302, H04R 1112
Patent
active
042497477
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.
REFERENCES:
patent: 2310048 (1943-02-01), Albersheim
patent: 2820853 (1958-01-01), Dally
patent: 3918723 (1975-11-01), Nakajima et al.
patent: 4011417 (1977-03-01), Kageyama et al.
patent: 4089530 (1978-05-01), Kawabe et al.
patent: 4136884 (1979-01-01), Iyeta
Bauer, deceased Benjamin B.
Bauer, executrix by Ida
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