| 摘要 |
PURPOSE:To execute the control of exposure (the correction of exposure) having high precision with a small scale and simple constitution by variably setting a set value in a means for resetting a preset counted value and/or an integration by an exposure correction setting means. CONSTITUTION:The level of integration value set for an IC 100 for photometry and an integrating counted value set for a photometry block 210 of a gate array 200 from a microcomputer 300 for photometry are altered so that they should be proper values according to necessities such as the correction of exposure, etc. Namely, the microcomputer 300 for photometry is equipped with a table for coding where a counting code D' corresponding to every counting number D (the range of counting number) is set in its own ROM and by converting the counting number D into a logarithmic value, the computation of the quantity of exposure can be easily executed by an apex system. Thus, the control of exposure having high precision can be executed with the small scale and simple constitution without using an analog storage means such as a capacitor, etc. |
