Reproducing stylus for an information signal recording medium

Details Reproducing stylus for an information signal recording medium Reproducing stylus for an information signal recording medium

1981-07-20

1985-01-01

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369173, G11B 906, G11B 344

Patent

active

044919417

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 portion with a sliding contact face for slidingly contacting at least one track of the recording medium, and an electrode disposed on the reproducing stylus main structure 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 an end edge and side edges. The side edges are substantially parallel at least in the vicinity of the tip portion of the reproducing stylus main structure. The sliding contact face has a leading part and a trailing part respectively at the foremost end and the rearmost end in a relative sliding direction of the sliding contact face on the recording medium. The end edge of the electrode is at said trailing part, the length l of the sliding contact face in the relative sliding direction being larger than the width d of the end edge of the electrode in a direction perpendicular to the relative sliding direction.

REFERENCES:
patent: 1914659 (1933-06-01), Olsen
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patent: 4162510 (1979-07-01), Keizer
patent: 4199782 (1980-04-01), Wada et al.
patent: 4273967 (1981-06-01), Wada et al.

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