Electric potential sensor, and image forming apparatus

Details Electric potential sensor, and image forming apparatus Electric potential sensor, and image forming apparatus

2005-11-15

2005-11-15

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Electrostatic field

Using modulation-type electrometer

C324S660000

Reexamination Certificate

active

06965239

ABSTRACT:
Disclosed in a non-contacting electric potential sensor capable of being readily reduced in its size, which includes a detecting electrode, an electrically-conductive movable shutter, and a driving unit for driving the electrically-conductive movable shutter. The detecting electrode is to be placed facing a measurement object whose electric potential is to be measured. The electrically-conductive movable shutter is disposed so as to be movably located in a spacing formed between the detecting electrode and the measurement object when the detecting electrode is placed facing the measurement object, so that an exposure degree of the detecting electrode against the measurement object can be controlled. The driving unit includes a current injecting unit for selectively injecting current into the electrically-conductive movable shutter in a direction approximately perpendicular to a moving direction of the electrically-conductive movable shutter.

REFERENCES:
patent: 4149119 (1979-04-01), Buchheit
patent: 5517123 (1996-05-01), Zhao et al.
patent: 6177800 (2001-01-01), Kubby et al.
patent: 6215318 (2001-04-01), Schoefthaler et al.
patent: 2000-147035 (2000-05-01), None

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