Biological information measurement device
A biological information measurement device including a housing having an annular structure and attachable to a subject, a first sensor including a first electrode, the first sensor detecting first biological information, a second sensor including a second electrode, the second sensor detecting second biological information different from the first biological information, a third sensor including a light receiving unit, the third sensor detecting third biological information different from the first biological information and the second biological information, and a ground electrode shared by the first sensor, the second sensor, and the third sensor is provided, wherein the first electrode, the second electrode, the light receiving unit, and the ground electrode are arranged to protrude in an inner direction of the housing.
1 . A biological information measurement device comprising:
a housing having an annular structure including a front support part configured to correspond to a forehead of a subject and a back support part configured to correspond to a back side of the head of the subject;
a first sensor is an electroencephalographic (EEG) sensor including a first electrode which functions as an active electrode;
a second sensor is a galvanic skin response (GSR) sensor including a second electrode configured to supply a predetermined voltage;
a third sensor is a photoplethysmographic (PPG) sensor including a light receiving unit; and
a ground electrode configured to provide a ground voltage to the EEG sensor, the GSR sensor and the PPG sensor;
wherein the first electrode, the second electrode, the light receiving unit, and the ground electrode are arranged to protrude from an inner surface of the housing; and
wherein the first electrode and the ground electrode are symmetrically arranged about the light receiving unit along the front support part.
2 . The biological information measurement device according to claim 1 ,
wherein:
the first sensor includes a contact electrode; and
the second electrode and the contact electrode share a common electrode.
3 . The biological information measurement device according to claim 1 ,
wherein a second electrode of the EEG sensor operates as a reference electrode during the EEG measurement.
4 . The biological information measurement device according to claim 1 , wherein:
the light receiving unit is arranged substantially at a center of the front support part; and
the first electrode and the ground electrode are arranged within a predetermined range from a position of the light receiving unit.
5 . The biological information measurement device according to claim 4 , wherein a direction of protrusion of light receiving unit from the inner surface of the housing and a direction of protrusion of the first electrode from the inner surface form an angle that is within 30°.
6 . The biological information measurement device according to claim 1 ,
wherein: the light receiving unit is arranged substantially at a center of the front support part; and
the second electrode is arranged in the back support part.