Detecting device and measuring device
A detecting device of the present disclosure includes a first light-emitting unit that emits first light having a green wavelength band, a second light-emitting unit that emits second light having a wavelength band higher than the green wavelength band, a first light-receiving unit that receives the first light emitted from the first light-emitting unit and emitted from a biological body, and a second light-receiving unit that receives the second light emitted from the second light-emitting unit and emitted from the biological body, in which the first light-receiving unit includes a bandpass filter that selectively transmits the first light, and a distance from the first light-emitting unit to the first light-receiving unit is shorter than a distance from the second light-emitting unit to the second light-receiving unit.
1. A detecting device, comprising:
a first light-emitting unit that emits first light having a green wavelength band;
a second light-emitting unit that emits second light having a wavelength band higher than the wavelength band of the green wavelength band;
a first light-receiving unit that receives the first light emitted from the first light-emitting unit after propagating through biological body;
a second light-receiving unit that receives the second light emitted from the second light-emitting unit after propagating through the biological body;
a detection surface that is configured to contact a surface of the biological body; and
a first light-shielding wall provided between (i) the first light-emitting unit and the second light-emitting unit and (ii) the first light-receiving unit, the first light-shielding wall being configured to block a part of the first light and the second light, wherein
the first light-receiving unit includes a bandpass filter that selectively transmits the first light,
a distance from the first light-emitting unit to the first light-receiving unit is shorter than a distance from the second light-emitting unit to the second light-receiving unit, and
a leading end portion of the first light-shielding wall protrudes from the detection surface.
2. The detecting device according to claim 1 , wherein
the first light-receiving unit includes the bandpass filter that selectively transmits the first light, and
the second light-receiving unit does not include a bandpass filter that selectively transmits the second light.
3. The detecting device according to claim 1 , wherein
the first light-receiving unit includes a first sensor unit that receives the first light and a first angle-limiting filter that limits an incidence angle of the first light reaching the first sensor unit, and
the second light-receiving unit includes a second sensor unit that receives the second light and a second angle-limiting filter that limits an incidence angle of the second light reaching the second sensor unit.
4. The detecting device according to claim 1 , wherein there is no light shielding wall provided between the first light receiving unit and the second light receiving unit.
5. A detecting device, comprising:
a first light-emitting unit that emits first light having a green wavelength band;
a second light-emitting unit that emits second light having a wavelength band higher than the wavelength band of the green wavelength band;
a first light-receiving unit that receives the first light emitted from the first light-emitting unit after propagating through a biological body;
a second light-receiving unit that receives the second light emitted from the second light-emitting unit after propagating through the biological body;
a detection surface that is configured to contact a surface of the biological body;
a first light-shielding wall provided between (i) the first light-emitting unit and the second light-emitting unit and (ii) the first light-receiving unit, the first light-shielding wall being configured to block a part of the first light and the second light; and
a bandpass filter provided at a light-receiving element of the first light-receiving unit, the bandpass filter being configured to selectively transmit the first light, wherein
a distance from the first light-emitting unit to the first light-receiving unit is shorter than a distance from the second light-emitting unit to the second light-receiving unit, and
a leading end portion of the first light-shielding wall protrudes from the detection surface.
6. The detecting device according to claim 5 , wherein there is no light shielding wall provided between the first light receiving unit and the second light receiving unit.
7. The detecting device according to claim 1 , further comprising
a sealing layer that seals the first light-emitting unit and the second light-emitting unit, and the first light-receiving unit and the second light-receiving unit, wherein
the leading end portion of the first light-shielding wall protrudes from the sealing layer.
8. The detecting device according to claim 1 , wherein
a distance from the first light-shielding wall to the first light-receiving unit is longer than a distance from the first light-shielding wall to the first light-emitting unit.
9. The detecting device according to claim 5 , wherein
the first light-emitting unit is provided at a light-emission surface, the first light-emitting unit including an optical element that deflects a direction in which the first light is emitted, in a normal direction of the light-emission surface.
10. A detecting device, comprising:
a first light-emitting unit that emits first light having a green wavelength band,
a second light-emitting unit that emits second light having a wavelength band higher than the wavelength band of the green wavelength band,
a first light-receiving unit that receives the first light emitted from the first light-emitting unit after propagating through biological body,
a second light-receiving unit that receives second light emitted from the second light-emitting unit after propagating through the biological body,
a detection surface that is configured to contact a surface of the biological body,
a first light-shielding wall provided between (i) the first light-emitting unit and the second light-emitting unit and (ii) the first light-receiving unit, the first light-shielding wall being configured to block a part of the first light and the second light,
an angle-limiting filter provided at a light-receiving element of the first light-receiving unit, the angle-limiting filter being configured to limit an incidence angle of the first light reaching the first light-receiving unit, and
a bandpass filter provided at the angle-limiting filter, the bandpass filter being configured to selectively transmit the first light, wherein
a distance from the first light-emitting unit to the first light-receiving unit is shorter than a distance from the second light-emitting unit to the second light-receiving unit, the second light-receiving unit being devoid of an angle-limiting filter that limits an incidence angle of the second light reaching the second light-receiving unit and a bandpass filter that selectively transmits the second light, and
a leading end portion of the first light-shielding wall protrudes from the detection surface.
11. The detecting device according to claim 5 , further comprising
a second light-shielding wall provided on an opposite side of the second light-receiving unit from the first light-receiving unit.
12. The detecting device according to claim 11 , wherein
a gap L between the second light-receiving unit and the second light-shielding wall is set to a value satisfying a following formula:
L
<
H
/
tan
θ
-
W
[
Formula
1
]
where a height from a light-receiving surface of the second light-receiving unit to a leading end of the second light-shielding wall is H,
a width of the second light-receiving unit in a direction in which the first light-receiving unit and the second light-receiving unit are aligned is W, and
an angle formed by an imaginary line connecting an end portion, on a side of the first light-receiving unit, of the light-receiving surface of the second light-receiving unit and an upper end surface, on a side of the second light-receiving unit, of the second light-shielding wall, and the light-receiving surface of the second light-receiving unit is θ.
13. The detecting device according to claim 1 , wherein
the first light-emitting unit and the second light-emitting unit are aligned side-by-side in a first direction, and
the first light-receiving unit and the second light-receiving unit are aligned side-by-side in a second direction intersecting the first direction.
14. The detecting device according to claim 1 , further comprising
a third light-emitting unit that emits third light, wherein
the second light-emitting unit emits, as the second light, light in one wavelength band of a red wavelength band or a near-infrared wavelength band,
the third light-emitting unit emits, as the third light, light in another wavelength band of the red wavelength band or the near-infrared wavelength band,
the second light-receiving unit receives the third light emitted from the third light-emitting unit after propagating through the biological body, and the second light, and
the distance from the first light-emitting unit to the first light-receiving unit is shorter than a distance from the third light-emitting unit to the second light-receiving unit.
15. The detecting device according to claim 1 , further comprising
a third light-emitting unit that emits third light, and
a third light-receiving unit that receives the third light emitted from the third light-emitting unit after propagating through the biological body, wherein
the second light-emitting unit emits, as the second light, light in one wavelength band of a red wavelength band or a near-infrared wavelength band,
the third light-emitting unit emits, as the third light, light in another wavelength band of the red wavelength band and the near infrared wavelength band, and
the distance from the first light-emitting unit to the first light-receiving unit is shorter than a distance from the third light-emitting unit to the third light-receiving unit.
16. The detecting device according to claim 5 , wherein
the first light-emitting unit is disposed, in a first direction, between the second light-emitting unit and the third light-emitting unit, and
the first light-receiving unit and the second light-receiving unit are aligned side-by-side in a second direction intersecting the first direction.
17. A measuring device, comprising
the detecting device according to claim 1 , and
an information analysis unit that determines biometric information from a detection signal indicating a detection result of the detecting device.
18. The detecting device according to claim 1 , further comprising a third light-emitting unit that emits third light having a wavelength band higher than the wavelength band of the second light, wherein among (i) a distance between a center of the first light-emitting unit to a center of the first light-receiving unit, (ii) a distance between a center of the second light-emitting unit to a center of the first light-receiving unit, and (iii) a distance between a center of the third light-emitting unit to a center of the first light-receiving unit, the distance between the center of the first light-emitting unit to the center of the first light-receiving unit is the shortest.