PULSE WAVE SENSOR
First Claim
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.
1 Assignment
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Accused Products
Abstract
A pulse wave sensor includes: 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 turn 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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Citations
10 Claims
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1. A pulse wave sensor comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification