PROBLEM TO BE SOLVED: To reliably correct influence on a wavelength variable element by the change of circumferential temperature with a simple configuration.SOLUTION: The power source device 12 of an endoscope system 2 includes the wavelength variable element 58 for varying the wavelength bandwidth of transmission light. The wavelength variable element 58 includes a temperature sensor 76. The CPU 40 of a processor 11 acquires the correction value of a driving voltage in the piezoelectric actuator 70 of the wavelength variable element 58, which corresponds to the measurement result of the temperature sensor 76, from a driving voltage correction table 80. Then, rough adjustment for correcting the driving voltage of the piezoelectric actuator 70 is performed based on the correction value. An image processing circuit 44 performs fine adjustment for correcting sensitivity in the wavelength bandwidth after the rough adjustment, so as to be the sensitivity S in the setting wavelength bandwidth of the transmission light of the wavelength variable element 58 from the spectral sensitivity characteristic of a CCD 33.COPYRIGHT: (C)2012,JPO&INPIT【課題】周囲温度の変化による波長可変素子への影響を簡素な構成で確実に補正する。【解決手段】内視鏡システム2の光源装置12は、透過光の波長帯域が可変する波長可変素子58を有する。波長可変素子58には温度センサ76が配されている。プロセッサ装置11のCPU40は、温度センサ76の測定結果に応じた波長可変素子58の圧電アクチュエータ70の駆動電圧の補正値を駆動電圧補正テーブル80から取得し、この補正値で圧電アクチュエータ70の駆動電圧を補正する粗調整を行う。画像処理回路44は、CCD33の分光感度特性から、波長可変素子58の透過光の設定波長帯域における感度Sとなるよう、粗調整後の波長帯域における感度を補正する微調整を行う。【選択図】図2
