The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 17, 2009
Filed:
Dec. 08, 2005
Atsushi Kandori, Ebina, JP;
Yoshikatsu Ichimura, Tokyo, JP;
Takashi Ushijima, Yokohama, JP;
Yoshitaka Zaitsu, Kawasaki, JP;
Atsushi Kandori, Ebina, JP;
Yoshikatsu Ichimura, Tokyo, JP;
Takashi Ushijima, Yokohama, JP;
Yoshitaka Zaitsu, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An electric potential measuring apparatus includes a movable portion having a detecting electrode and a magnetic force receiver, a magnetic force generator, an electric field shield, and a detector for detecting an amount of an electric charge which is electrostatically induced on the detecting electrode. The electric field shield transmits a magnetic field generated by the magnetic force generator to make it arrive at the magnetic force receiver but shields the detecting electrode from an electric field generated by the magnetic force generator to interrupt arrival to the detecting electrode and not to substantially obstruct the detection by the detector.