| 摘要 |
<p>PURPOSE:To obtain a proper quantity of light when the desired number of times of light emission is completed by varying a decision voltage for deciding on the integral output of a photometering circuit according to the set number of times of light emission. CONSTITUTION:The photometering circuit 102 which meters reflected light from a subject by the light emission of a flash discharge tube 16 is constituted by connecting the anode of a photodetecting element 103 to the grounded uninverted input terminal of an operational amplifier 104 and connecting the cathode to the inverted input terminal of the operational amplifier 104 and also to the output terminal of the operational amplifier 104 through an intergrating capacitor 105. The decision voltage V2 for light emission control at each time is obtained by dividing a reference voltage V0 for determining the proper quantity of light on the basis of photographic information by the number of times (n) of light emission. Consequently, the proper quantity of light is obtained when light emission is completed at the number of times (n).</p> |
