PULSE WAVE DETECTOR

To provide a pulse wave detector capable of more accurately detecting a pulse wave.SOLUTION: A pulse wave detector acquires received light intensity not only at the time of making an LED emit light but also before and after the time. The pulse wave detector, then, calculates, as prior differential intensity, a value obtained by subtracting received light intensity immediately before making the LED emit light from light emission time intensity, received light intensity at the time of LED light emission; and calculates, as posterior differential intensity, a value obtained by subtracting received light intensity immediately after making the LED extinguish light from the light emission time intensity. A pulse wave index value calculation unit calculates, as a sub index value, a value obtained by summing up the prior differential intensity and the posterior differential intensity. The sub index value described above is calculated by single index value calculation processing every time the LED is made to emit light. A value obtained by summing up sub index values is adopted as a pulse wave index value.SELECTED DRAWING: Figure 5 【課題】より精度良く脈波を検出可能な脈波検出装置を提供する。【解決手段】脈波検出装置は、ＬＥＤを発光させている時に加えて、その前後における受光強度を取得する。そして、ＬＥＤ発光時の受光強度である発光時強度から、ＬＥＤを発光させる直前の受光強度を減算した値を前差分強度として算出するとともに、発光時強度からＬＥＤを消灯させた直後の受光強度を減算した値を後差分強度として算出する。脈波指標値算出部は、前差分強度と後差分強度を足し合わせた値をサブ指標値として算出する。１回の指標値算出処理として、ＬＥＤを発光させる度に以上のサブ指標値を算出し、それらを足し合わせた値を脈波指標値として採用する。【選択図】図５