BIOLOGICAL INFORMATION DETECTOR AND BIOLOGICAL INFORMATION MEASUREMENT DEVICE

• US 20110166457A1
• Filed: 12/20/2010
• Published: 07/07/2011
• Est. Priority Date: 01/05/2010
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: SATO, Shigemi, YAMASHITA, Hideto, IIJIMA, Yoshitaka
• Granted Patent: US 8,740,791 B2
• Time in Patent Office: Days
• US Class Current: 600/479
• CPC Class Codes: A61B 2562/0233 Special features of optical sensors or probes classified in A61B5/00
• CPC Class Codes: A61B 2562/043 in a linear array
• CPC Class Codes: A61B 5/02427 Details of sensor
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/6824 Arm or wrist
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal

Abstract

A biological information detector includes a first sensor unit for detecting composite information including biological information of a test subject and first noise information originating in external light, having a first light-emitting part for emitting toward there, a first light-receiving part for receiving it including the biological information, reflected there, and the light including the first noise information obtained from the external light, transmitted through there, and a first reflecting and leading part for reflecting the light including the biological and the first noise information, leading it to the first light-receiving part, and a second sensor unit for detecting second noise information originating in the external light, having a second light-receiving part for receiving the light including the second noise information, obtained from the external light and transmitted through there, and a second reflecting, leading part for reflecting the external light and leading it to the second light-receiving part.

Claims

1. A biological information detector comprising:

a first sensor unit subjected to detect composite information including biological information of a detection site of a test subject and first noise information originating in external light; and

a second sensor unit subjected to detect second noise information originating in the external light;

the first sensor unit having

a light-emitting part subjected to emit a first light toward the detection site,

a first light-receiving part subjected to receive the light including the biological information obtained from the first light emitted toward the detection site being reflected by the detection site, and the light including the first noise information obtained from the external light being transmitted through the test subject, and

a first reflecting part subjected to reflect the light including the biological information and the light including the first noise information and leading the light to the first light-receiving part;

the second sensor unit having

a second light-receiving part subjected to receive the light including the second noise information obtained from the external light being transmitted through the test subject, and

a second reflecting part subjected to reflect the light including the second noise information and leading the light to the second light-receiving part.

2. The biological information detector of claim 1, wherein

a relation S2<

S1 is satisfied, where S1 is an area of a reflecting surface of the first reflecting part, and S2 is an area of a reflecting surface of the second reflecting part.

3. The biological information detector of claim 1, wherein

the light-emitting part further emits a second light toward a different direction from the detection site;

the first sensor unit further has a third reflector for reflecting the second light and leading the light to the detection site; and

the first light-receiving part receives the light including the biological information obtained from the second light being reflected by the detection site.

4. The biological information detector in claim 1, wherein

the second sensor unit further has a fourth reflector for reflecting a part of the light including the second noise information and suppressing the light including the second noise information from reaching the second light-receiving part.

5. The biological information detector in claim 1, wherein

the first sensor unit further has

a wiring to the light-emitting part, and

a wiring to the first light-receiving part, and

the second sensor unit further has

a wiring to the second light-receiving part, and

a pseudo-wiring for suppressing the light including the second noise information from reaching the second light-receiving part.

6. The biological information detector in claim 1, wherein

the first reflecting part is formed as a spherical surface or a parabolic surface;

the second reflecting part is formed as a spherical surface or a parabolic surface; and

a relation Δ

hc>

Δ

h is satisfied, where Δ

h is a distance between a light-receiving surface of the first light-receiving part and a center of an arc defining the spherical surface of the first reflecting part or a focus of a parabola defining the parabolic surface of the first reflecting part, and Δ

hc is a distance between a light-receiving surface of the second light-receiving part and a center of an arc defining the spherical surface of the second reflecting part or a focus of a parabola defining the parabolic surface of the second reflecting part.

7. A biological information measurement device comprising

the biological information detector described in claim 1;

and

a biological information measurement unit for measuring the biological information on the basis of signals generated in the first light-receiving part and signals generated in the second light-receiving part.

8. The biological information measurement device in claim 7, wherein

the biological information is a pulse count.