Stylus

Details Stylus Stylus

1987-07-07

1989-08-08

Stephan, Steven L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Mechanical modification or sensing of storage medium

G11B 344

Patent

active

048559890

ABSTRACT:
A stylus for tracking stereophonic and quadrophonic sound grooves in gramophone records is designed to resemble a cutting tool, but is provided with tracking or contact edges in lieu of cutting edges, the tracking edges being of a much longer radius of curvature than comparable cutting edges. A tip (1, 11, 21, 31) of the stylus (2, 12, 22, 32) has at least one substantially flat surface (5, 15, 29, 39) forming a leading front side of the stylus during tracking and has an isosceles triangular, trapezoidal or circular segment-shaped section bounded by tracking edges (6, 7; 16, 17; 26, 27; 36, 37) having a relatively long radius of 3 to 8 .mu.m.

REFERENCES:
patent: 4105213 (1978-08-01), Owaki et al.
patent: 4416005 (1983-11-01), vanden Hul
patent: 4521877 (1985-06-01), Shimomoto

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