| 摘要 |
PURPOSE:To measure light over a wide range like artificial panoramic image pickup operation with simple constitution by connecting two photoconductive elements for visible light electrically in series and controlling exposure according to the sum of the resistance values of the respective photoconductive elements varying with the quantity of incident light. CONSTITUTION:Subject light beams from photometric areas which are horizontally different in position in a photographic area are made incident on the respective photoconductive elements 26a and 26b through two photodetection lenses 29a and 29b. At this time, the photoconductive elements 26a and 26b decrease in resistance value when the quantity of photodetection is large or increase when small. The photoconductive elements 26a and 26b are connected in series, so a current based upon the sum of the respective resistance values flows through a circuit. For the purpose, the circuit is so constituted that a shutter speed is fast when the photometric areas are bright and a large current flows and slow when the photometric areas are dark and a small current flows. Consequently, proper exposure is performed with the simple constitution. |
