| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To appropriately control light emission quantity of a flash unit. <P>SOLUTION: The dimming controller for performing dimming control of a light emission part 2 of the flash unit 100 includes a light-receiving element 10, an integration circuit 12 for integrating an output signal of a light-receiving element, an amplifying circuit 14 for amplifying the output signal of the integration circuit at a predetermined amplification factor, amplification factor-setting parts 18 and 20 for setting the amplification factor of the amplifying circuit variably according to the elapsed time, and a determining circuit 16 for outputting a light emission stop signal to a light emission part of the flash unit when an output signal of the amplifying circuit exceeds a predetermined reference value. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
