Magnetic pick-up and/or cutter cartridge

Details Magnetic pick-up and/or cutter cartridge Magnetic pick-up and/or cutter cartridge

1981-12-22

1984-06-26

Goldberg, Gerald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Mechanical modification or sensing of storage medium

369136, 369146, 369148, 29602R, G11B 300, H04R 1112

Patent

active

044569840

ABSTRACT:
A magnetic cartridge such as a pick-up or cutter, whose magnetic circuits are at least partly hollow, the cavities extending mainly in the direction of the magnetic flux. Each magnetic circuit and in particular each polepiece is formed at least partly with a slot communicating with the cavity and extending substantially in the same direction. This reduces eddy-current losses in the magnetic circuit, thereby improving the treble reproduction of the pick-up.

REFERENCES:
patent: 1651922 (1925-09-01), Hughes
patent: 2320632 (1939-11-01), McMaster
patent: 2469137 (1949-05-01), Strong
patent: 2652521 (1949-08-01), Westphal
patent: 3575034 (1971-04-01), Lightner
patent: 4031335 (1977-06-01), Smit
patent: 4140886 (1979-02-01), Itoh
patent: 4353125 (1982-10-01), Itoh et al.

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