Detection device
According to an aspect, a detection device includes: a first light source configured to emit light having a predetermined wavelength; a second light source configured to emit light having a wavelength different from that of light emitted by the first light source; optical sensors provided at different locations from each other and configured to measure the light emitted by the first light source and the second light source; a light quantity controller configured to set a light quantity of at least one of the first light source or the second light source so that a measurement value based on at least one of detection values of the optical sensors reaches a predetermined target value; and a biometric information detector configured to, when the measurement value has reached the predetermined target value, detect information on a living body with the optical sensors using the set light quantity for detecting biometric information.
1 . A detection device comprising:
a first light source configured to emit light having a predetermined wavelength;
a second light source configured to emit light having a wavelength different from that of the light emitted by the first light source;
a plurality of optical sensors provided at different locations from each other and configured to measure and detect the light emitted by the first light source and the second light source, the plurality of optical sensors configured to output detection values based on the detected light;
circuitry configured to set a light quantity of at least one of the first light source or the second light source so that a measurement value based on at least one of the detection values output by the optical sensors reaches a predetermined target value; and
a biometric information detector configured to, when the measurement value has reached the predetermined target value, detect information on a living body with the optical sensors using the light quantity for detecting biometric information set by the light quantity controller.
2 . The detection device according to claim 1 , wherein
the circuitry comprises:
a first light quantity controller configured to increase the light quantity of the first light source until an average value of the measurement values based on the detection values of the optical sensors reaches the predetermined target value;
a second light quantity controller configured to increase the light quantity of the second light source until the average value of the measurement values based on the detection values of the optical sensors reaches the target value; and
a light quantity storage configured to, when the increased light quantity of the first light source and the increased light quantity of the second light source have each reached the predetermined target value, store the light quantity set by the first light quantity controller and the light quantity set by the second light quantity controller as the light quantities for detecting the biometric information.
3 . The detection device according to claim 1 , wherein
the circuitry comprises:
a first light quantity controller configured to increase the light quantity of the first light source until the measurement value of an optical sensor in a predetermined coordinate position among the optical sensors reaches the predetermined target value;
a peak coordinate acquirer configured to, when the measurement value in the predetermined coordinate position has reached the target value, acquire a peak coordinate position where the measurement value is highest among those of the optical sensors;
a second light quantity controller configured to increase the light quantity of the second light source until the measurement value in the peak coordinate position acquired by the peak coordinate acquirer reaches the target value; and
a light quantity storage configured to, when the measurement value in the peak coordinate position has reached the target value, store the light quantity set by the first light quantity controller and the light quantity set by the second light quantity controller as the light quantities for detecting the biometric information.
4 . The detection device according to claim 3 , wherein the peak coordinate acquirer is configured to acquire, as the peak coordinate position, a position where amplitude of a pulse wave is largest.
5 . The detection device according to claim 4 , wherein the pulse wave has a frequency of from 0.5 Hz to 3 Hz.
6 . The detection device according to claim 2 , wherein the first light quantity controller and the second light quantity controller are configured to, when the measurement value does not reach the target value, reset a target value lower than the target value as a new target value, and then increase the light quantity.
7 . The detection device according to claim 3 , wherein the first light quantity controller and the second light quantity controller are configured to, when the measurement value does not reach the target value, reset a target value lower than the target value as a new target value, and then increase the light quantity.
8 . The detection device according to claim 6 , wherein the first light quantity controller and the second light quantity controller are configured to, when the measurement value has failed a predetermined number of times to reach the target value, reset the lower target value as the new target value.
9 . The detection device according to claim 7 , wherein the first light quantity controller and the second light quantity controller are configured to, when the measurement value has failed a predetermined number of times to reach the target value, reset the lower target value as the new target value.
10 . The detection device according to claim 2 , wherein a detection area for detection by the optical sensors is divided into a plurality of areas, and the first light quantity controller and the second light quantity controller are configured to perform the processing for each of the divided areas.
11 . The detection device according to claim 3 , wherein a detection area for detection by the optical sensors is divided into a plurality of areas, and the first light quantity controller and the second light quantity controller are configured to perform the processing for each of the divided areas.
12 . The detection device according to claim 1 , wherein
the first light source is a light source configured to emit infrared light, and
the second light source is a light source configured to emit red light.
13 . The detection device according to claim 1 , wherein the first light source and the second light source are disposed around the optical sensors.
14 . The detection device according to claim 1 , wherein the information on the living body detected by the biometric information detector is a blood oxygen saturation level.
15 . The detection device according to claim 1 , wherein the optical sensors are organic photodiodes.
16 . The detection device according to claim 1 , wherein the light quantity is a luminance.