PROBLEM TO BE SOLVED: To provide an endoscope apparatus capable of narrowing an insertion section by sharing conductive lines for LED drive power supply, for identifying an optical adapter, and for a thermister for detecting distal end temperature and making them into a two-line type while retaining identification accuracy of the optical adapter and temperature detection accuracy of the thermister.SOLUTION: A distal end power supply section 17 of a body section 3 alternately and pulsedly outputs a first voltage higher than a voltage of a threshold emitted by LED 8 and a second voltage lower than the threshold, to a thermistor 11 at a distal end 2a, an illumination circuit section 7 with the LED 8 that are connected in parallel to both ends thereof, and an oscillator circuit section 9 with an oscillator circuit 9a, via two conductive lines 14a and 14b passing through an insertion section 2. In an output period of the second voltage, the endoscope performs an individual identification from AC components of the oscillator circuit 9a and detects the temperature of the distal end from DC components.COPYRIGHT: (C)2014,JPO&INPIT【課題】光学アダプタの識別精度及びサーミスタの温度検出精度を保ったまま、LED駆動電源用、光学アダプタ識別用、先端温度検出のサーミスタ用の導電線を共通化し、2線式にして挿入部を細径化することができる内視鏡装置を提供する。【解決手段】本体部3の先端部用電源部17は、挿入部2内を通した2本の導電線14a,14bを介して先端2aのサーミスタ11と、その両端に並列接続されたLED8を備えた照明回路部7と、発振回路9aを備えた発振回路部9とに、LED8が発光する閾値の電圧より高い第1の電圧と、閾値より低い第2の電圧とを交互にパルス状に出力し、第2の電圧の出力期間において発振回路9aによる交流成分から光学アダプタの固体識別、直流成分から先端温度検出を行う。【選択図】図1
