| 摘要 |
Each of N optical detector parts 801 to 80N has a photodiode PD, a capacitor Cd and a switch SW0. An amplifier A1, an integrator circuit capacitor Cf1, and a switch SW11 , are connected in parallel between the input terminal and the output terminal of an integrator circuit 10. The capacitance of the integrator circuit capacitance C11 is equal to the capacitance of the capacitor Cd in each of the N optical detector parts 801 to 80N. A switch SW01, is equipped between the input terminal of the integrator circuit 10 and the switch SW0 for each of the N optical detector parts 801 to 80N. A switch SW02 is equipped between the output terminal of the integrator circuit 10 and the switch SW0 in each of the N optical detector parts 801, to 80N.
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