Apparatus for video disc stylus electrode reconditioning

Details Apparatus for video disc stylus electrode reconditioning Apparatus for video disc stylus electrode reconditioning

1980-09-19

1982-03-16

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369129, 369151, 369 71, 369 55, H04N 580, G11B 906

Patent

active

043204910

ABSTRACT:
The invention describes a method and apparatus for reconditioning a video disc signal pickup stylus electrode to prevent electrode-disc electrical shorts. An AC or DC potential is repetitively applied during a predetermined period between the stylus electrode and the disc to produce electrical breakdown at the electrode-disc interface and vaporize a portion of the electrode material. In the capacitive type video disc system, the capacitance sensing pickup circuitry is repetitively tuned to couple excessive amounts of rf potential to the stylus electrode.

REFERENCES:
patent: 2803738 (1957-08-01), Glenn
patent: 3842194 (1974-10-01), Clemens
patent: 3843846 (1974-10-01), Miller
patent: 4152641 (1979-05-01), Hughes
"Technique for the rapid, accurate and strain-free machining of metallic single crystals" by Cole et al., British Journal of Applied Physics; vol. 12, Jun. 1961; pp. 296, 297.

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