ELECTRIC POTENTIAL MEASURING APPARATUS AND IMAGE FORMING APPARATUS
摘要
<p>An electric potential measuring apparatus comprises a movable portion having a detecting electrode and a magnetic force receiving means, a magnetic force generation means, an electric field shielding means, and a detection means for detecting an amount of an electric charge which is electrostatically induced on the detecting electrode, the electric field shielding means transmitting a magnetic field generated by the magnetic force generation means to make it arrive at the magnetic force receiving means but shielding the detecting electrode from an electric field generated by the magnetic force generation means to interrupt arrival to the detecting electrode and not to obstruct the detection by the detection means substantially.</p>
