Biological Detection Device Layout for Compact Dual-Wavelength Sensing
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Solution Overview
Problem
Existing detecting devices for non-invasively measuring biological information face challenges in downsizing due to the need for space to accommodate light-shielding members that improve light utilization efficiency, which complicates device configuration.
Innovation Solution
A detecting device with a first light-emitting section emitting green light, a second light-emitting section emitting longer wavelength light, and light-receiving sections disposed in a specific alignment and size configuration, where the first light-receiving section is closer and smaller than the second, allowing for efficient light reception and device miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light-shielding member with an inclined surface is installed to improve light utilization efficiency, then light utilization efficiency is improved, but device size increases due to the space required for the inclined surface
Solution Approach 1:
The patent extracts the light-shielding function from a separate member with an inclined surface and integrates it into the housing structure itself. The housing's inner wall is designed with a light-shielding surface that reflects light directly onto the light-receiving section, eliminating the need for a dedicated light-shielding member and reducing device volume while maintaining light utilization efficiency
Solution Approach 2:
The housing structure is merged with the light-shielding function. The housing's inner wall serves dual purposes: structural containment and light reflection. This integration combines the housing and light-shielding member into a single component, reducing the number of parts and device size while preserving the light reflection function
2Adaptability or versatility
If multiple light-emitting and light-receiving sections are arranged to detect multiple wavelengths, then measurement capability is improved, but device configuration complexity increases
Solution Approach 1:
The patent arranges light-receiving sections in different spatial positions and orientations within the housing. The first light-receiving section is positioned to receive green light, while the second light-receiving section is positioned to receive red light, with each oriented at appropriate angles relative to their respective light-emitting sections. This spatial arrangement enables multi-wavelength detection without requiring complex optical paths or additional optical components
Solution Approach 2:
The housing structure serves multiple functions simultaneously: it provides structural support, shields light between different wavelength channels, and provides reflective surfaces for light guidance. The first and second light-shielding surfaces in the housing respectively reflect green and red light, demonstrating how a single structure performs multiple light management functions for different wavelengths
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
The solution enables downsizing of the device while maintaining accurate detection of biological information, reducing power consumption, and improving signal-to-noise ratio by optimizing light propagation and reception distances.
Implementation Method 1
a light-receiving section configured to receive light emitted from the light-emitting section and reflected by the living body
Implementation Method 2
The above-described detecting device reflects light by an inclined surface formed on the light-shielding member, thereby improving the light utilization efficiency of the light-emitting section
Data Source
AI summary
A detecting device includes: a first light-emitting section configured to emit first light having a green wavelength band; a second light-emitting section configured to emit second light having a wavelength band longer than the green wavelength band; a first light-receiving section configured to receive the first light emitted from the first light-emitting section and passed through a living body; and a second light-receiving section configured to receive the second light emitted from the second light-emitting section and passed through the living body. In the direction intersecting the direction in which the first light-emitting section and the second light-emitting section are aligned, in the second direction, at least a portion of the first light-receiving section is disposed closer to the first light-emitting section than the second light-receiving section. An area of the first light-receiving section is smaller than an area of the second light-receiving section.