| 摘要 |
PURPOSE:To execute the proper control of exposure by respectively executing different weighting to a sensor corresponding to an instructed specific range and other sensor and operating density signals with the weight every sensor. CONSTITUTION:Plural detecting means 16 for independently detecting the density on a part of the surface of an original 2 are provided and an indication means for instructing the specific range of the original corresponding to the detecting means 16 is provided too. And the signals detected by the respective detecting means 16 are operated with the corresponding weight by altering the weight in the specific range and out of the specific range when the instructing means executes the instruction and by setting a certain weight there when it does not execute the instruction. The means value or the total value of the operated results is set as the density signal so as to execute the control of exposure. Thus, the proper control of the exposure can be executed. |
