| 摘要 |
PURPOSE:To measure the surface potential of the photosensitive body through simple constitution without any influence of stains by measuring a potential originating from the electrostatic charging in the discharge area of a charger as a current which flows to an electrode. CONSTITUTION:A detection currents Iv which flows a detecting electrode 4 provided in the discharge area of the charger 1 of a photosensitive body 6 and varies with the surface potential of the photosensitive body 6 is converted into a voltage through a constant voltage element 7 connected to the electrode 4 and a grounded resistance R1. This voltage is processed by a smoothing capacitor C, inverting amplifiers Q1 and Q2, etc. and outputted, the surface potential of the photosensitive body is measured by the detection in the area of the charger for electrostatic charge through the simple constitution which requires no electrometer without any influence of stains. |
