PROBLEM TO BE SOLVED: To provide an endoscope apparatus in which a high-quality image is obtained while suppressing signal deterioration and noise generation.SOLUTION: An analog pixel signal outputted from an image sensor 12 is subjected to electric current amplification in an output buffer 15 and transmitted to an analog signal processing circuit 22 of a processor through a transmission cable CB. In addition, in a case where a diaphragm opening angle is comparatively small and an intensity of the pixel signal is comparatively large, it is determined that effect by heat on illumination intensity is small, in order to increase the output amplitude of the pixel signal, a constant current circuit 53 is controlled to increase amperage supplied to the image sensor 12. Along with the increment in the amperage, a gain value in a gain processing circuit 58 is reduced.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】内視鏡装置において、信号劣化およびノイズ発生を抑えながら、高画質の画像を得る。【解決手段】イメージセンサ12から出力されるアナログ画素信号を出力バッファ15において電流増幅し、伝送ケーブルCBを通じてプロセッサのアナログ信号処理回路22へ送信する。そして、絞りの開度が比較的小さく、かつ、画素信号の輝度値が比較的大きい場合、照明光量の熱による影響が少ないと判断し、画素信号の出力振幅を大きくするため、定電流回路53を制御してイメージセンサ12へ供給する電流量を増加させる。電流量増加に伴い、ゲイン処理回路58におけるゲイン値を小さくする。【選択図】図2
