| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a noise current which occurs due to changes in parasitic capacitance between a detection electrode and a shield case made of an electrically conductive material in an electric potential measuring apparatus to be oscillated by the sensing electrode. <P>SOLUTION: In the electric potential measuring apparatus, an oscillating member 4 capable of oscillation and provided with sensing electrodes 2a and 2b in surfaces opposed to an object to be measured 1 is housed in the shield case 7 made of an electrically conductive material except a part opposed to the object to be measured 1. The inner wall shape of the shield case 7 in the vicinity of a region including the range of oscillation of the oscillating member 4 has such a shape as to maintain an approximately constant minimum distance (d) between the sensing electrodes 2a and 2b and inner walls of the shield case 7 regardless of displacements of the sensing electrode 4. <P>COPYRIGHT: (C)2007,JPO&INPIT |
