Dynamic information storage or retrieval – Specific detail of information handling portion of system – Mechanical modification or sensing of storage medium
Patent
1982-09-23
1985-12-10
McElheny, Jr., Donald
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Mechanical modification or sensing of storage medium
369147, 369172, H04R 916
Patent
active
045584435
ABSTRACT:
An improved pickup cartridge of the kind including two moving coils is disclosed which is constructed such that a cantilever including a stylus tip at its foremost end is inclinably held by means of a damping rubber fixedly fitted into a longitudinally extending hole in a cartridge case which is preferably divided into two case halves and a pair of coils are wound about the cantilever which are located opposite to one another relative to the damper rubber disposed therebetween. An assembly of a magnet and yokes is fixedly held in the cartridge case so as to generate two magnetic fields which are directed at a right angle relative to one another, one of them being located corresponding to one of the coils and the other one being located corresponding to the other coil. Preferably, an assembly including the cantilever, the coils and the damper rubber is fitted into a sleeve and the latter is inserted in the longitudinally extending hole in the cartridge case. The damper rubber serves as a fulcrum for vibratory inclination of the cantilever. The coils are preferably wound about tubular magnetic cores which are fitted onto the cantilever. The yokes are bent and bifurcated at their upper part to form two gaps between the inclined extensions thereof so as to generate the magnetic fields by means of the magnet.
REFERENCES:
patent: 4364120 (1982-12-01), Honma
Koyama Etsuo
Nakamura Kazuhiro
McElheny Jr. Donald
Tekudaiya Kabushiki Kaisha
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