| 摘要 |
PURPOSE:To make it possible to read an original having a plurality of colors at high resolution and a high speed, by laminating two photoconductive layers having the different optical forbidden band widths by commonly using a light transmitting common electrode, changing a voltage that is applied to the common electrode, and operating a photocurrent, in which a spectral sensitivity characteristic is changed in correspondence with the applied voltage. CONSTITUTION:As a first photoconductive layer 14, e.g., antimony sulfide is deposited. Electrodes 13 and 15 are formed on both surfaces in the direction of a thickness. Thus a sandwich type optoelectric transducer element 19 is formed. Then, as a second photoconductive layer 16, zinc solenoid is used, and a sandwich type optoelectric transducer element 20 is formed by the same way described above. The photoconductive layers 14 and 16 are laminated by commonly using the light transmitting common electrode 15. When light 18 is inputted from the side of a discrete electrode 17 on the second photoconductive layer 16, the second photoconductive layer 16 works as a filter. Therefore, a photocurrent indicates spectrums approximately close to the tristimulus values of a CIE. All pieces of color information (hue, saturation and lightness) can be accurately detected by the operation based on the photocurrent. |
