Electricity: measuring and testing – Electrostatic field – Using modulation-type electrometer
Reexamination Certificate
2008-05-13
2008-05-13
Hirshfeld, Andrew H (Department: 2858)
Electricity: measuring and testing
Electrostatic field
Using modulation-type electrometer
C399S048000
Reexamination Certificate
active
07372278
ABSTRACT:
An electric potential measuring apparatus includes a detecting electrode, a modulator for changing an electrostatic capacitance between a measurement object and the detecting electrode by mechanical vibration, a charge detector for detecting the amount of charges electrostatically induced in the detecting electrode by the modulator, and a vibration generating-detecting unit for selectively performing either a vibration generating function of exciting the mechanical vibration, or a detecting function of detecting the condition of the mechanical vibration.
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Ichimura Yoshikatsu
Kandori Atsushi
Noguchi Kaoru
Ushijima Takashi
Zaitsu Yoshitaka
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Hirshfeld Andrew H
Nguyen Hoai-An D
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