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PULSE WAVE SENSOR

  • US 20150366513A1
  • Filed: 06/19/2015
  • Published: 12/24/2015
  • Est. Priority Date: 06/24/2014
  • Status: Abandoned Application
First Claim
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1. A pulse wave sensor comprising:

  • an optical sensor unit configured to irradiate a living body with light emitted from a light emitting unit and detect light reflected from or transmitted through the living body with a light receiving unit to generate a current signal in accordance with a light reception intensity;

    a pulse driving unit configured to turn on or off the light emitting unit at a predetermined frame frequency and a predetermined duty rate;

    a current/voltage conversion circuit configured to convert the current signal into a voltage signal; and

    a detection circuit configured to extract an upper envelope and a lower envelope of the voltage signal and obtain a difference therebetween to generate a detection signal.

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