Pickup cartridge

Details Pickup cartridge Pickup cartridge

1982-02-23

1985-01-08

Faber, Alan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Mechanical modification or sensing of storage medium

H04R 1112

Patent

active

044930712

ABSTRACT:
The present invention is directed to a pickup cartridge used for reproducing an information recorded on a record disc, the pickup cartridge having a magnet, a stylus which engages a spiral groove on the record disc, a pole piece for forming a path for a magnetic flux generated by the magnet and varied in response to the movement of the stylus and a wire coil wound on the pole piece for producing a signal voltage. The pole piece is made of magnetic material with electrical conductivity, such as permalloy, and is provided with an output electrode portion at one end. One end of the coil wire is connected electrically to the pole piece. The signal voltage is induced in the coil in response to variations in the magnetic flux passing through the pole piece and is fed to the output electrode portion at the end of the pole piece.

REFERENCES:
patent: 3146319 (1964-08-01), Stanton
patent: 3646279 (1972-02-01), Stanton
patent: 4103116 (1978-07-01), Mishima

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