Biometric information acquisition device

1 . A biometric information acquisition device, comprising:

a light emitting unit having a first light emitting element that emits red light toward a living body of a wearer of the biometric information acquisition device, a second light emitting element that emits infrared light toward the living body, and a third light emitting element that emits green light toward the living body;

a light receiving unit having a first light receiving element that receives the red light that passed through the living body, a second light receiving element that receives the infrared light that passed through the living body, and a third light receiving element that receives the green light that passed through the living body; and

circuitry that:

obtains first information based on a light amount of the red light received by the first light receiving element, second information based on a light amount of the infrared light received by the second light receiving element, and third information based on a light amount of the green light received by the third light receiving element;

controls drive and stop of each of the first light emitting element, the second light emitting element, and the third light emitting element, wherein

the biometric information acquisition device measures:

first biometric information only during a sleeping period of the wearer based on the first information and the second information, and

second biometric information during both the sleeping period of the wearer and a non-sleeping period of the wearer based on the third information,

the first biometric information is information about blood oxygen saturation level of the wearer, and

the second biometric information is information about pulse wave of the wearer; and

performs at least one of:

a first process, which stops light emission of the first light emitting element and the second light emitting element when a measurement period for measuring the first biometric information reaches a first time period T1, and

a second process, which stops light emission of the third light emitting element when the measurement period for measuring the second biometric information reaches a second time period T2,

wherein the second time period T2 is longer than the first time period T1.

2 . The biometric information acquisition device according to claim 1 , wherein the first time period T1 includes the sleeping period of at least three days.

3 . The biometric information acquisition device according to claim 2 , further comprising:

a motion sensor that detects sleep of the wearer, wherein

the circuitry drives the first light emitting element and the second light emitting element during the sleeping period in the first time period T1, and stops the light emission of the first light emitting element and the second light emitting element except during the sleeping period in the first time period T1.

4 . The biometric information acquisition device according to claim 1 , wherein the second time period T2 is at least 4 consecutive days.

5 . The biometric information acquisition device according to claim 1 , wherein the first time period T1 and the second time period T2 are settable.