Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1978-02-27
1979-05-01
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
1791001B, G01R 2726
Patent
active
041526414
ABSTRACT:
Stylus suitable for use in a capacitive disc record playback apparatus comprises a wedge-shaped support material and an electrode formed on a flat longitudinal surface of the support material. Signal pickup qualities of such stylus can be determined by supporting such stylus on a silicon dioxide-silicon wafer where the capacitance formed between the electrode bottom and the wafer can be changed at a cyclical rate by energizing the wafer with a low frequency signal. A tuned resonator circuit coupled to the electrode detects those capacitance variations and additional undesired capacitance variations contributed by fringe capacitance between the whole of the electrode and the wafer. Where the wafer is of an n-type silicon material, the contribution of the fringe capacitance to the detected capacitance variations is reduced by growing a large quantity of positive charge in the silicon dioxide layer of the wafer.
REFERENCES:
patent: 3842194 (1974-10-01), Clemens
patent: 3842217 (1974-10-01), Clemens
patent: 3873782 (1975-03-01), Palmer
patent: 3909517 (1975-09-01), Clemens
Hughes Gary W.
Kawamoto Hirohisa
Krawczewicz Stanley T.
RCA Corporation
Tripoli J. S.
Whitacre E. M.
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