Biological information detector and biological information measuring device

Abstract

A biological information detector is adapted to be attached to a user's body, and includes a light-emitting part, a reflecting part, a light-receiving part and a processing unit. The light-emitting part is configured to emit light toward the user's body. The reflecting part is disposed in a periphery of the light-emitting part to reflect at least a part of the light emitted by the light-emitting part toward the user's body. The light-receiving part is configured to receive light reflected at the user's body to produce a light reception signal. The processing unit is configured to process the light reception signal to produce biological information.

What is claimed is: 
     
         1 . A biological information detector adapted to be attached to a user's body, comprising:
 a light-emitting part configured to emit light toward the user's body;   a reflecting part disposed in a periphery of the light-emitting part to reflect at least a part of the light emitted by the light-emitting part toward the user's body;   a light-receiving part configured to receive light reflected at the user's body to produce a light reception signal; and   a processing unit configured to process the light reception signal to produce biological information.   
     
     
         2 . The biological information detector according to  claim 1 , wherein
 the reflecting part includes a reflecting surface parallel to a light-emitting surface of the light emitting part facing the user's body, the reflecting surface having a high reflectivity region.   
     
     
         3 . The biological information detector according to  claim 2 , wherein
 the reflecting surface has a reflectivity of 80% to 90%.   
     
     
         4 . The biological information detector according to  claim 1 , wherein
 the reflecting part includes a quadrilateral-shaped region.   
     
     
         5 . The biological information detector according to  claim 4 , wherein
 a length of at least one side of the quadrilateral-shaped region is 100 μm to 10,000 μm.   
     
     
         6 . The biological information detector according to  claim 2 , wherein
 the reflecting surface has at least one of a curve-shaped corner and a right angle shaped corner.   
     
     
         7 . The biological information detector according to  claim 2 , wherein
 the reflecting surface has the high reflectivity region and a low reflectivity region, and the high reflectivity region does not overlap with the light-emitting part.   
     
     
         8 . The biological information detector according to  claim 1 , further comprising
 a protecting part configured to protect the reflecting part and the light-emitting part, the protecting part being made of a transparent material to transmit the light reflected at the user's body.   
     
     
         9 . The biological information detector according to  claim 8 , wherein
 a thickness of the protecting part is within a range from 1 μm to 1000 μm.   
     
     
         10 . The biological information detector according to  claim 1 , further comprising
 a substrate physically in contact with the light-receiving part and the reflecting part and to have a thickness from 10 μm to 1000 μm.   
     
     
         11 . The biological information detector according to  claim 10 , further comprising
 a wiring for at least one of the light-emitting part and the light-receiving part, the wiring being formed on the substrate.   
     
     
         12 . The biological information detector according to  claim 1 , further comprising
 an acceleration detecting part configured to detect a movement of the user's body and to generate an acceleration signal.   
     
     
         13 . The biological information detector according to  claim 12 , further comprising:
 a first A/D conversion circuit configured to perform A/D conversion of the light reception signal from the light-receiving part for the processing unit;   a second A/D conversion circuit configured to perform A/D conversion of the acceleration signal from the acceleration detecting part for the processing unit, wherein   the processing unit is configured to produce the biological information using signals from the first A/D conversion circuit and the second A/D conversion circuit.   
     
     
         14 . The biological information detector according to  claim 1 , wherein
 the light-emitting part is configured to emit the light having a maximum intensity within a wavelength range of 425 nm to 625 nm.   
     
     
         15 . The biological information detector according to  claim 1 , wherein
 the light-emitting part is configured to emit green light.