Electrostatic voltage detecting device

Details Electrostatic voltage detecting device Electrostatic voltage detecting device

1982-06-03

1984-12-18

Levy, Stewart J.

Electricity: measuring and testing

Electrostatic field

324113, 324452, 369151, G11B 1106

Patent

active

044892780

ABSTRACT:
An electrostatic voltage detecting device includes a detecting electrode for detecting an electrostatic voltage generated by charge on a recording medium, a variable capacitance diode whose capacitance changes according to an output signal applied from the detecting electrode, a primary coil combined with the variable capacitance diode to form a resonance circuit, an oscillator for supplying an oscillating output signal of predetermined frequency to the primary coil, and a secondary coil inductively coupled with the primary coil. The capacitance of the variable capacitance diode changes according to an output voltage applied from the detecting electrode to vary a resonance frequency of the resonance circuit and consequently a voltage induced in the secondary coil.

REFERENCES:
patent: 2423208 (1947-07-01), Sinnett
patent: 2426061 (1947-08-01), Snepvangers
patent: 2445990 (1948-07-01), Badmaeiff
patent: 2532060 (1950-11-01), Dicke
patent: 2615960 (1952-10-01), Erwin
patent: 2843679 (1958-07-01), Hogue
patent: 2847515 (1958-08-01), Parker
patent: 2851540 (1958-09-01), Theriault
patent: 3005060 (1961-10-01), Weathers
patent: 3195037 (1965-07-01), Van Nie
patent: 4371961 (1983-02-01), Rose

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