| US 7,554,331 B2 | ||
| Electric potential measuring device and image forming apparatus | ||
| Yoshikatsu Ichimura, Setagaya-ku (Japan); Takayuki Yagi, Yokohama (Japan); and Yoshitaka Zaitsu, Kawasaki (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Mar. 28, 2007, as Appl. No. 11/727,672. | ||
| Application 11/727672 is a division of application No. 10/550450, granted, now 7,265,554, previously published as PCT/JP2004/004343, filed on Mar. 26, 2004. | ||
| Claims priority of application No. 2003-092212 (JP), filed on Mar. 28, 2003. | ||
| Prior Publication US 2007/0247166 A1, Oct. 25, 2007 | ||
| Int. Cl. G01R 29/12 (2006.01); G01R 27/26 (2006.01) | ||
| U.S. Cl. 324—458 [324/663; 324/660] | 14 Claims |
| 1. An electric potential measuring device comprising:
a signal detection electrode having a divided structure, wherein each section of the divided detection electrode is independently
connected to a detection calculation circuit;
a movable structure comprised of a first solid material portion comprised of a dielectric and a second solid material portion
comprised of a conductive material; and
a drive mechanism for moving the movable structure in such a way as to change a positional relationship of the first and second
solid material portions for the signal detection electrode,
wherein the movable structure has no aperture and a charge induced on the signal detection electrode is modulated by moving
the movable structure, to measure an electric potential of the object to be measured, and
wherein the first solid material portion transmits electric lines of force radiated from the object to be measured to the
signal detection electrode.
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