| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a light control circuit for flash lamp which is improved in light control accuracy for each light emitting and imaging condition, and a flash device using the same. <P>SOLUTION: The light control circuit for flash lamp and the flash device using the same include: a semiconductor light receiving element 13 that generates a photoelectric current Ip corresponding to the intensity of light reflected by a subject; a current ratio variation means 14 that outputs a variable current Ia according to the passage of light emission time; a voltage integration means 15 that integrates voltage on the basis of the photoelectric current Ip from the semiconductor light receiving element 13 and the variable current Ia from the current ratio variation means 14; a reference voltage generation means 16 that outputs reference voltage Vref as a basis for the integrated voltage Vint; and a voltage comparison means 17 that compares the integrated voltage Vint with the reference voltage Vref. <P>COPYRIGHT: (C)2011,JPO&INPIT |
