| 摘要 |
PURPOSE:To compare pictures easily without operations in a short time, by connecting photoelectric transducers, which form one photodetection face, and photoelectric transducers, which form the other photodetection face, in series and measuring output currents based on the quantity of light. CONSTITUTION:Many photoelectric transducers such as phototransistors and photodiodes are used, and photoelectric transducers M1-Mn are used as picture elements to form the first image receiving face, and photoelectric transducers N1-Nn are used as picture elements to form the second image receiving face. Picture elements M1-Mn and N1-Nn are arranged in positions, which correspond to each other respectively, on the first and the second image receiving faces. When respective quantities of light are denoted as a1-an and b1-bn, an output current (i) becomes as shown in expression because the output current is dependent upon (a) or (b) having a smaller quantity of light in the series connection of respective transducers. A resistance terminal voltage V is equal to Ri. When pictures on both image receiving faces coincide with each other, the current becomes maximum. |
