| 摘要 |
PROBLEM TO BE SOLVED: To provide a pulse wave detector which causes small detection error by body movement and can more accurately detect a pulse wave. SOLUTION: A first piezoelectric sensor 10a is placed on an artery and a second piezoelectric sensor 10b on a place slightly off the artery. Since the piezoelectric sensor has narrow directivity, signals corresponding to a pulse waveform and a body motion wave are outputted from the first piezoelectric sensor 10a on an artery but signals corresponding only to the body movement are outputted from the second piezoelectric sensor which is not on an artery. The body motion components are canceled by taking difference of output from both piezoelectric sensors 10a, 10b to enable an accurate pulse wave to be detected. The pulse rate and the waveform information are obtained from the pulse wave.
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