PROBLEM TO BE SOLVED: To provide a pulse wave sensor capable of performing accurate pulse wave measurement (pulse measurement) even under an outdoor activity environment.SOLUTION: A pulse wave sensor 1 includes: an optical sensor part 11 for generating a current signal IB according to the light reception intensity by irradiating light to a living body from a light emission part 11A, and detecting the light reflected from the living body or the transmitted light by a light reception part 11B, a pulse drive part 17 for turning on/off the light emission part 11A by a predetermined frame frequency and a predetermined duty, a current/voltage conversion circuit 121 (e.g., a transimpedance amplifier) for converting the current signal IB to a voltage signal Sa, and a detector circuit 123 for generating a detection signal Sc by extracting an upper envelope and a lower envelope of the voltage signal Sa (a voltage signal Sb through a buffer 122) respectively and executing difference processing for them.COPYRIGHT: (C)2016,JPO&INPIT【課題】屋外活動環境下でも正確な脈波計測(脈拍計測)を行うことのできる脈波センサを提供する。【解決手段】脈波センサ1は、発光部11Aから生体に光を照射して生体からの反射光または透過光を受光部11Bで検出することにより受光強度に応じた電流信号IBを生成する光センサ部11と、発光部11Aを所定のフレーム周波数及びデューティで点消灯させるパルス駆動部17と、電流信号IBを電圧信号Saに変換する電流/電圧変換回路121(例えばトランスインピーダンスアンプ)と、電圧信号Sa(バッファ122を介した電圧信号Sb)の上側包絡線と下側包絡線を各々抽出して差分することにより検波信号Scを生成する検波回路123と、を有する。【選択図】図5
