Patent Number: 7,710,129

Title: Potential measurement apparatus and image forming apparatus

Abstract: A potential measurement apparatus is provided which can suitably maintain the oscillation state of an oscillator including a detection electrode and stably measure the potential of a measurement object. The potential measurement apparatus includes a bearing part, an elastic supporting part supported by the bearing part, an oscillator movably supported by the elastic supporting part, detection electrodes installed in the oscillator, a drive mechanism driving the oscillator and a signal detection unit. The signal detection unit is connected to the detection electrodes to detect electrical signals appearing in the detected electrodes. A stress detecting element for generating an electric signal according to the stress of the elastic suspension part 142 is provided.

Inventors: Ogawa; Toshiyuki (Tokyo, JP), Zaitsu; Yoshitaka (Kawasaki, JP), Ushijima; Takashi (Yokohama, JP), Kandori; Atsushi (Ebina, JP), Noguchi; Kaoru (Tokyo, JP), Kato; Kazuhiko (Tokyo, JP), Hirose; Futoshi (Yokohama, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G01R 27/08 (20060101); G01L 1/00 (20060101); G01R 27/26 (20060101); G01R 29/12 (20060101); G03G 15/00 (20060101)

Expiration Date: 5/04/12018