Biological Information Detecting Device with Variable Height Light-Transmissive Member
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Solution Overview
Problem
Existing pulse wave measuring devices face challenges in reducing noise caused by body motion due to differences in light penetration depths and absorbance characteristics across different wavelengths, making it difficult to accurately detect biological information.
Innovation Solution
A biological information detecting device with multiple light receiving portions and a light-transmissive member that applies varying pressing forces, allowing for distinct detection signal characteristics and effective noise reduction by using identical wavelength bands and adjusting the height and distance of light-transmissive members to correlate and differentiate signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light with different wavelengths is used to measure pulse wave by detecting reflected light, then the extinction characteristics between oxygenated hemoglobin and reduced hemoglobin can be utilized, but the difference in penetration depths of light having different wavelengths causes difficulty in reducing noise caused by body motion
Solution Approach 1:
The patent divides the light receiving function into multiple separate light receiving portions (first light receiving portion and second light receiving portion) that receive light at different locations. Each portion detects signals with different characteristics - one primarily captures pulse wave information while the other primarily captures body motion noise. This segmentation allows the system to separate and subsequently remove the noise component from the pulse wave signal through calculation processing.
Solution Approach 2:
The patent applies different pressing forces at different locations by designing the light-transmissive member with varying heights (h1 > h2) at positions corresponding to different light receiving portions. This creates local differences in contact pressure, causing the first light receiving portion to detect signals with stronger pulse wave characteristics and the second light receiving portion to detect signals with stronger body motion noise characteristics, thereby optimizing the signal-to-noise ratio for each detector.
2Object-affected harmful factors
If multiple light receiving portions are used to detect signals with different characteristics, then body motion noise can be reduced, but the device structure becomes more complex
Solution Approach 1:
The patent combines multiple light receiving portions and light emitting portions into a single integrated sensor unit that functions as one cohesive component. This integrated sensor is then incorporated into the wearable device, allowing the complex multi-element structure to be managed as a single modular unit, thereby reducing the overall device complexity while maintaining the noise reduction capabilities.
Solution Approach 2:
The light-transmissive member serves multiple functions simultaneously: it acts as a structural component that applies pressing force to the subject, serves as a support for mounting light emitting portions and light receiving portions, and functions as an optical element that transmits light between the emitter and receiver. This multi-functionality reduces the need for separate components, thereby simplifying the overall device structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables the detection of pulse signals while effectively reducing body motion noise, improving the accuracy of biological information measurement by correlating and differentiating the signals from multiple light receiving portions.
Implementation Method 1
a light-transmissive member which is provided at a position further on the subject side than the first light receiving portion and the second light receiving portion, through which light from the subject is transmitted
Implementation Method 2
a first light receiving portion which receives light from a subject
Implementation Method 3
a second light receiving portion which receives light from the subject
Data Source
AI summary
A biological information detecting device includes: a first light receiving portion which receives light from a subject; a second light receiving portion which receives light from the subject; and a light-transmissive member which is provided at a position further on the subject side than the first light receiving portion and the second light receiving portion, through which light from the subject is transmitted. In a direction from the biological information detecting device to the subject, when a height of the light-transmissive member at a position or in a region corresponding to the first light receiving portion is set to h1 and a height of the light-transmissive member at a position or in a region corresponding to the second light receiving portion is set to h2, h1>h2 is satisfied.