| 摘要 |
It is the problem to provide a photometric device of low cost and low current consumption, which can be used in a film with a lens or the like. Brightness deciding means 35 judges an ambient brightness in accordance with the output of a counter 22 for counting the output of a first oscillator 33 having an oscillatory frequency unchanged according to the ambient brightness, and the output of a counter 24 for counting the output of a second oscillator 34 having an oscillatory frequency changed according to the ambient brightness. In this case, the ambient brightness is judged not according to the outputs coming from the individual oscillators 33 and 34 but according to the outputs of the individual counters 22 and 24 for counting the outputs of the individual oscillators 33 and 34. Even if the second oscillator 34 used is not changed so much in its oscillatory frequency in accordance with the ambient brightness, therefore, the slight differences can be accumulated by a counter so that the ambient brightness can be reliably judged according to the accumulated outputs. <IMAGE> |
