| 摘要 |
PURPOSE:To enable to respond to the chrominance information of broad range with a simple constitution, by using the photo conductor element of two layer construction. CONSTITUTION:The PN junctions 4, 3 different in the depth to photo detection plane are formed, and the unit consists of the photo semiconductor element 1 providing the electrodes to pick up the photo output current at the junctions 3, 4, and variable amplifying circuits A1, A2 to which the photo output current at the junctions 3, 4, of the element 1 is respectively inputted and the amplification factor of the photo output current of another is changed to one photo output current. Further, by comparing B the photo output current outputted from the circuts A1 and A2, the color difference output is formed. |
