US 11,744,519 B2
Biological information measurement device
Taki Hashimoto, Shiojiri (JP); and Hiromitsu Mizukami, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jul. 30, 2019, as Appl. No. 16/526,217.
Claims priority of application No. 2018-143350 (JP), filed on Jul. 31, 2018.
Prior Publication US 2020/0037960 A1, Feb. 6, 2020
Int. Cl. A61B 5/1455 (2006.01); A61B 5/00 (2006.01); A61B 5/024 (2006.01)
CPC A61B 5/7203 (2013.01) [A61B 5/02427 (2013.01); A61B 5/7207 (2013.01); A61B 5/7214 (2013.01); A61B 5/681 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A biological information measurement device comprising:
a first light emitting portion that emits first light;
a second light emitting portion that emits second light;
a light receiving portion that receives the first light reflected by an epidermis of a skin, a dermis of the skin, and a subcutaneous layer, and the second light reflected by the epidermis and dermis of the skin;
a light shielding portion disposed between the second light emitting portion and the light receiving portion, the light shielding portion configured to shield light emitted directly from the first light emitting portion to the light receiving portion and light emitted directly from the second light emitting portion to the light receiving portion to suppress the first light and the second light from being directly incident on the light receiving portion without passing through a body of a user; and
a processing unit that calculates biological information by removing noise from a first detection signal output based on the first light received by the light receiving portion, using a second detection signal output based on the second light received by the light receiving portion,
wherein a virtual line passing through a light emission center of the second light emitting portion in a direction orthogonal to a direction from the second light emitting portion toward the light receiving portion defines a virtual line VL1, and a virtual line passing through the light receiving portion that is parallel to and separated by 2 mm from the virtual line VL1 is defined as virtual line VL2, and
a region defined by an area of the light receiving portion on a second light emitting portion side of the virtual line VL2 is larger than a remaining region of the light receiving portion in plan view.