Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Electrostatic attraction or piezoelectric
Patent
1984-04-13
1989-05-30
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Electrostatic attraction or piezoelectric
324458, 324457, G01R 2922
Patent
active
048354619
ABSTRACT:
An electrostatic voltmeter with probe for measuring the charge on a surface, the probe comprising a microdeflector unit having a base; a flexible finger supported on the base in cantilever fashion, the finger deflecting in response to a potential difference thereacross; means to bias the base to a predetermined potential; a sensing electrode on the finger having a side positionable in spaced relation to the surface, the capacitive relation established creating a charge representative of the charge on the surface on the sensing electrode causing deflection of the finger; means to impinge a beam of light on the finger; and a detector disposed to detect reflection of the beam by the finger on predetermined deflection of the finger corresponding to a preset charge measured on the surface. In a second embodiment, a feed-back loop is provided; in a third embodiment, the finger is vibrated to render the probe spacing insensitive; and in a forth embodiment the microdeflector unit is modified to function as the image reading device in a multi-code copier/printer application.
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Eisenzopf Reinhard J.
McMullen Frederick E.
Solis Jose M.
Xerox Corporation
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