Physiological signal measurement device

A physiological signal measurement device, comprising:

• a housing, a front surface of the housing protruding frontward to form a hollow in-ear portion;
• a bracket having a base portion fastened to a front end of the in-ear portion, several portions of a front surface of the base portion protruding frontward to form a plurality of first elastic portions arranged in a ring shape;
• a rigid circuit board fastened in the housing, the rigid circuit board being equipped with a microprocessor;
• a first flexible circuit board assembled in the housing and the in-ear portion, the first flexible circuit board having a fastening end and a resilient end, the fastening end of the first flexible circuit board being electrically connected with the rigid circuit board, the resilient end of the first flexible circuit board projecting beyond the front surface of the base portion and surrounding the plurality of the first elastic portions, an outside of the resilient end of the first flexible circuit board being equipped with a plurality of light emitters and a plurality of light sensors, each of the plurality of the first elastic portions being corresponding to one of the plurality of the light emitters and one of the plurality of the light sensors, the plurality of the light emitters and the plurality of the light sensors of the first flexible circuit board being electrically connected with the microprocessor of the rigid circuit board by virtue of the first flexible circuit board;
• and
• a protective sleeve having a fastening portion, and a plurality of spaced second elastic portions protruded from a front surface of the fastening portion and arranged in a ring shape, the fastening portion being fastened to root portions of outer sides of the plurality of the first elastic portions, the plurality of the spaced second elastic portions surrounding free ends of the plurality of the first elastic portions and the outside of the resilient end of the first flexible circuit board, the plurality of the light emitters and the plurality of the light sensors being clamped between the plurality of the first elastic portions and the plurality of the spaced second elastic portions.