Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1980-05-30
1981-10-13
Faber, Alan
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 53, 369132, 369133, 358127, 324 61R, 310318, 310319, H04N 576, G11B 2736
Patent
active
042952166
ABSTRACT:
A monitoring circuit for monitoring and measuring the mechanical characteristics of a piezoelectric video disc recording cutterhead takes the form of a bridge network. The motional charge or motional current, which are related to the mechanical characteristics of the cutterhead, is measured by providing signals of a first polarity to one leg of the bridge and signals of a polarity opposite to the first to another leg of the bridge.
One leg of the bridge includes the cutterhead and a sensing capacitor connected in series while the other leg includes the sensing capacitor and a balancing capacitor connected in series. When the capacitance value of the balancing capacitor is properly chosen, the voltage drop across the sensing capacitor is proportional to certain mechanical characteristics of the cutterhead (e.g., displacement).
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patent: 3842194 (1974-10-01), Clemens
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patent: 4044379 (1977-08-01), Halter
patent: 4060831 (1977-11-01), Halter
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Ross Michael D.
Truesdell Raymond L.
Faber Alan
RCA Corporation
Roehling J. E.
Tripoli J. S.
Whitacre E. M.
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