Stylus for reproducing capacitive videodisc

Details Stylus for reproducing capacitive videodisc Stylus for reproducing capacitive videodisc

1979-04-18

1981-06-16

Wolff, John H.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369 43, 369 50, 369221, H04N 580

Patent

active

042739675

ABSTRACT:
A reproducing stylus traces a track of a recording medium, in which track an information signal is recorded as variations of geometrical shape, and reproduces as variations in capacitance the information signal thus recorded. The reproducing stylus comprises a reproducing stylus main structure having a tip part with a flat sliding contact face for slidingly contacting a plurality of track of the recording medium at a time, and an electrode secured to the reproducing stylus main structre at the tip part thereof and adapted to trace one track and reproduce the information signal as the variations in capacitance in accordance with the variations in geometrical shape. The electrode has over a specific distance over the tip part of the stylus main structure from the extreme tip thereof, a constant width in the width direction of the track which is less than the width of the track. The extreme tip of the electrode has a flat or linear tip end contacting the track.

REFERENCES:
patent: 1817094 (1931-08-01), Moore
patent: 2572426 (1951-10-01), Andrews
patent: 4031546 (1977-06-01), Leedom
patent: 4098030 (1978-07-01), Fuhrer
patent: 4104832 (1978-08-01), Keiger
patent: 4124867 (1978-11-01), Fuhrer

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