Biological information measurement apparatus, biological information measurement method, biological information measurement system and computer-readable medium

Patent metadata

Field	Value
Publication number	US-11399728-B2
Application number	US-201916364313-A
Country	US
Kind code	B2
Filing date	Mar 26, 2019
Priority date	Mar 27, 2018
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

Abstract

A biological information measurement apparatus comprises: a light source which illuminates a measurement target with light; a light receiving portion which receives a light amount of reflected light of the light from the measurement target; and a selecting unit which, based on a light amount received by the light receiving portion at each of a plurality of wavelengths of the reflected light, selects a wavelength to be used to measure biological information from the plurality of wavelengths.

First claim

What is claimed is:

1. A biological information measurement apparatus, comprising:
a light source configured to illuminate a measurement target with light;
a light receiving portion configured to receive a reflected light from the measurement target; and
at least one processor or circuit to perform operations of (i) obtaining a variation amount of reflected lights detected at different times by the light receiving portion in a predetermined period for each of a plurality of wavelengths, (ii) selecting a wavelength to be used to measure biological information from the plurality of wavelengths based on the variation amount of reflected lights, and (iii) measuring biological information based on a light amount, of a reflected light of the selected wavelength detected by the light receiving portion.

2. The apparatus according to claim 1 , wherein the at least one processor or circuit further performs an operation of transmitting, to an external apparatus, information representing a light amount of a reflected light of the selected wavelength detected by the light receiving portion.

3. The apparatus according to claim 1 , further comprising a diffraction grating configured to divide the reflected light into luminous fluxes of the plurality of wavelengths, wherein
the light receiving portion includes a plurality of light receiving elements provided in correspondence with the luminous fluxes of the plurality of wavelengths and is configured to detect light amounts at a plurality of wavelengths using the plurality of light receiving elements.

4. The apparatus according to claim 1 , wherein in the selecting, a wavelength at which the variation amount of reflected lights is the largest is selected, or wavelengths included in a wavelength range of a predetermined width that includes the wavelength at which the variation amount of reflected lights is the largest are selected.

5. The apparatus according to claim 4 , wherein, in the measuring, biological information is measured based on a light amount obtained by performing statistical processing on light amounts of reflected lights at the wavelengths included in the selected wavelength range detected by the light receiving portion.

6. The apparatus according to claim 1 , wherein in the selecting, a wavelength at which a variation amount of reflected lights exceeds a predetermined threshold is selected, and
the predetermined threshold is a value larger than a variation amount of reflected lights obtained when the light source is off.

7. The apparatus according to claim 6 , wherein the predetermined threshold is obtained based on a variation amount of lights detected at different times by the light receiving portion in a predetermined period for each of the plurality of wavelengths while the light source is off.

8. The apparatus according to claim 1 , wherein the light source is a white LED.

9. The apparatus according to claim 1 , wherein biological information is measured using a predetermined wavelength when a variation amount of reflected lights of the predetermined wavelength is a predetermined value or more, and biological information is measured using the selected wavelength when a variation amount of reflected lights of the predetermined wavelength is smaller than the predetermined value.

10. The apparatus according to claim 9 , wherein the wavelength used in the measuring is set as a wavelength for measurement for the next instance of measurement.

11. The apparatus according to claim 1 , wherein, in the selecting, a predetermined wavelength is selected when a variation amount of reflected lights of a predetermined wavelength is larger than a predetermined value, and based on a variation amount of reflected lights a wavelength is selected from the plurality of wavelengths excluding the predetermined wavelength when a variation amount of reflected lights of the predetermined wavelength is the threshold value or less.

12. The apparatus according to claim 1 , wherein the light source has a plurality of light sources configured to output different wavelengths of light,
in the selecting, a light source to be used to measure biological information is selected from the plurality of light sources based on a variation amount of reflected lights obtained, in the obtaining, by turning on each of the plurality of light sources, and
in the measuring, biological information is measured by turning on the selected light source.

13. The apparatus according to claim 12 , wherein biological information is measured based on a light amount, detected by the light receiving portion, of a reflected light of a predetermined light source included in the plurality of light source when a variation amount of reflected lights of the predetermined light source is a predetermined value or more, and biological information is measured based on a light amount, detected by the light receiving portion, of a reflected light of a light source selected in the selecting when the variation amount of reflected lights of the predetermined light source is smaller than the predetermined value.

14. The apparatus according to claim 13 , wherein the light source used in the measuring is set as a light source for the next instance of measurement.

15. The apparatus according to claim 1 , wherein the light receiving portion includes a plurality of light receiving portions that are sensitive to different wavelengths,
in the selecting, a light receiving portion to be used to measure biological information is selected from the plurality of light receiving portions based on variation amounts of reflected lights obtained from the plurality of light receiving portions, and
in the measuring, biological information is measured using the selected light receiving portion.

16. The apparatus according to claim 15 , wherein biological information is measured using a predetermined light receiving portion included in the plurality of light receiving portions when a variation amount of reflected lights received by the predetermined light receiving portion is a predetermined value or more, and biological information is measured using a light receiving portion selected in the selecting when a variation amount of reflected lights measured using the predetermined light receiving portion is smaller than the predetermined value.

17. The apparatus according to claim 15 , wherein the light receiving portion used in the measuring is set as a light receiving portion for the next instance of measurement.

18. The apparatus according to claim 1 , further comprising a display unit, wherein the at least one processor or circuit further performs an operation of displaying, on the display unit, the biological information measured in the measuring.

19. The apparatus according to claim 1 , wherein the at least one processor or circuit further performs an operation of adjusting a light amount of the light source based on a value of a light amount, detected by the light receiving portion, of a reflected light of the selected wavelength.

20. A biological information measurement system having a detection apparatus including a light source configured to illuminate a measurement target with light, a light receiving portion configured to receive a reflected light from the measurement target, and an information processing apparatus connected to the detection apparatus, the biological information measurement system comprising at least one processor or circuit to perform operations of:
obtaining a variation amount of reflected lights detected at different times by the light

Assignees

• Canon Kk

Inventors

• Kitamura Toshifumi

Classifications

• A61B5/6826

  Finger · CPC title

• A61B5/02427 Primary

  Details of sensor · CPC title

• A61B5/7278

  Artificial waveform generation or derivation, e.g. synthesizing signals from measured signals · CPC title

• A61B5/0075 Primary

  by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy (A61B5/0071 takes precedence) · CPC title

• A61B5/721

  using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured · CPC title