PROBLEM TO BE SOLVED: To provide an endoscope system having a distal end equipped with an MOS type solid-state image pickup element, wherein a low-noise observation image is obtained by preventing an increase in temperature of the solid-state image pickup element.SOLUTION: The endoscope system includes: an electronic endoscope which has a distal end equipped with the MOS type solid-state image pickup element and an illumination portion adjacent to the MOS type solid-state image pickup element, causes the illumination portion to illuminate a subject in a body cavity when the distal end portion is inserted into the cavity, and captures an image of the subject by the MOS type solid-state image pickup element a temperature detecting means which detects the temperature of the MOS type solid-state image pickup element and a processor in which when the detected temperature by the temperature detecting means increases and reaches a threshold in the process where the MOS type solid-state image pickup element is driven at a drive mode for causing the MOS type solid-state image pickup element to output an image of the subject at a first frame (Fig.5(a)), the MOS type solid-state image pickup element is driven at a drive mode for changing the frame rate from the first frame rate to a second frame rate lower than the first one (Fig.5(b)).COPYRIGHT: (C)2012,JPO&INPIT【課題】MOS型固体撮像素子を先端部に搭載した内視鏡システムにおいて、固体撮像素子の温度上昇を抑制し、低ノイズの観察画像を得る。【解決手段】先端部にMOS型固体撮像素子が搭載されると共に該MOS固体撮像素子に隣接して照明部が設けられ、被検体の体腔内に前記先端部が挿入されたとき該体腔内の被写体を前記照明部で照明し前記MOS型固体撮像素子で該被写体の画像を撮影する電子内視鏡と、前記MOS型固体撮像素子の温度を検出する温度検出手段と、第1のフレームレート(図5(a))で前記被写体の画像を前記MOS型固体撮像素子から出力させる駆動モードで該MOS型固体撮像素子を駆動している最中に前記温度検出手段による検出温度が上昇して閾値に達したとき前記フレームレートを前記第1より低い第2のフレームレート(図5(b))にする駆動モードで前記MOS型固体撮像素子を駆動させるプロセッサ装置とを備える。【選択図】図5
