BIOLOGICAL INFORMATION DETECTION DEVICE

• US 20160058310A1
• Filed: 08/24/2015
• Published: 03/03/2016
• Est. Priority Date: 08/27/2014
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Iijima, Yoshitaka
• Granted Patent: US 10,653,327 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 2562/0233 Special features of optical sensors or probes classified in A61B5/00
• CPC Class Codes: A61B 2562/185 Optical shielding, e.g. baffles
• CPC Class Codes: A61B 5/02427 Details of sensor
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: A61B 5/681 Wristwatch-type devices
• CPC Class Codes: A61B 5/6843 Monitoring or controlling sensor contact pressure
• CPC Class Codes: A61B 5/7214 using signal cancellation, e.g. based on input of two identical physiological sensors spaced apart, or based on two signals derived from the same sensor, for different optical wavelengths

Abstract

A biological information detection device includes: a light emitting unit which irradiates a subject with light; a first light receiving unit which receives light from the subject; a second light receiving unit which receives light from the subject; and a beam which is provided between the first light receiving unit and the second light receiving unit, in a plan view in a vertical direction of a light receiving surface of the first light receiving unit.

Claims

1. A sensor comprising:

a light emitting unit which irradiates a subject with light;

a first light receiving unit which receives light from the subject;

a second light receiving unit which receives light from the subject; and

a beam which is provided between the first light receiving unit and the second light receiving unit, in a plan view in a vertical direction of a light receiving surface of the first light receiving unit.

2. The sensor according to claim 1,

wherein the first light receiving unit and the second light receiving unit are disposed along a first direction, and

when a distance in the first direction between an end portion of the beam on the first light receiving unit side and an end portion of the first light receiving unit on the second light receiving unit side is set as LE1, and a distance in the first direction between an end portion of the beam on the second light receiving unit side and an end portion of the second light receiving unit on the first light receiving unit side is set as LE2,

a relationship of LE1>

LE2 is satisfied.

3. The sensor according to claim 1, further comprising:

a light transmitting member which is provided on a position on the subject side with respect to the first light receiving unit and the second light receiving unit, passes light from the subject, and comes into contact with the subject when measuring biological information of the subject to apply a pressing force.

4. The sensor according to claim 3,

wherein the light transmitting member includes a first protrusion corresponding to the first light receiving unit and a second protrusion corresponding to the second light receiving unit, and

the beam shields light so that light which has passed a boundary between the first protrusion and the second protrusion is not incident to the light receiving surface of the first light receiving unit.

5. The sensor according to claim 3,

wherein the light transmitting member includes a first protrusion corresponding to the first light receiving unit and a second protrusion corresponding to the second light receiving unit, and

the beam is positioned on a position so as not to shield light which passes a position on the second protrusion side than a total reflection boundary of the first protrusion and is incident to a point where a distance to the beam is shortest among the light receiving surface of the second light receiving unit.

6. The sensor according to claim 3,

wherein the light transmitting member includes a first protrusion corresponding to the first light receiving unit and a second protrusion corresponding to the second light receiving unit, and

the sensor further includes a pressing force prevention unit which is provided so as to cover the first and second protrusions and prevents a pressing force applied to the subject by the first protrusion.

7. The sensor according to claim 3,

wherein, when a height of the light transmitting member in a position or an area corresponding to the first light receiving unit in a direction from a biological information detection device to the subject is set as h1 and a height of the light transmitting member in a position or an area corresponding to the second light receiving unit is set as h2, a relationship of h1>

h2 is satisfied.

8. The sensor according to claim 1,

wherein the first light receiving unit is disposed between the light emitting unit and the second light receiving unit.

9. The sensor according to claim 1, further comprising:

a processing unit which operates the biological information of the subject based on a first detection signal detected by the first light receiving unit.

10. The sensor according to claim 9,

wherein the processing unit performs a noise reduction process of the first detection signal based on a second detection signal detected by the second light receiving unit.

11. The sensor according to claim 1, further comprising:

a light shielding member which is provided so as to surround at least the first light receiving unit and the second light receiving unit, and includes a first opening corresponding to the first light receiving unit and a second opening corresponding to the second light receiving unit,

wherein the beam is provided between the first opening and the second opening.

12. The sensor according to claim 1, further comprising:

a light shielding member which includes first to third light shielding surfaces and the beam,

wherein the first light shielding surface is provided between the light emitting unit and the first light receiving unit, and

the second light shielding surface and the third light shielding surface are provided so as to intersect the first light shielding surface.

13. The sensor according to claim 12,

wherein the light shielding member is formed by sheet metal working of metal.

14. The sensor according to claim 12,

wherein the first light shielding surface and the second light shielding surface are provided so as to be adjacent to each other through a first gap area, and the first light shielding surface and the third light shielding surface are provided so as to be adjacent to each other through a second gap area.

15. The sensor according to claim 12,

wherein a first opening corresponding to the first light receiving unit is provided by the first light shielding surface, the second light shielding surface, the third light shielding surface, and the beam.

16. The sensor according to claim 12,

wherein a first opening corresponding to the first light receiving unit is provided by the first light shielding surface, the beam, and eaves.

17. The sensor according to claim 11,

wherein the light shielding member includes a protrusion, and

the protrusion is provided so that an attachment surface of the protrusion is positioned at a distance of a height HB (HB>

0) from an installation surface of the substrate to which the light shielding member is mounted.

18. A biological information detection device on which the sensor according to claim 1 is mounted.

19. A biological information detection device on which the sensor according to claim 2 is mounted.

20. A biological information detection device on which the sensor according to claim 3 is mounted.