Biometric Device Fluorescence Light Source and Receiver Arrangement
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Solution Overview
Problem
Biometric devices using fluorescence spectroscopy face challenges in downsizing due to the need for space between the light source and reception units and the organism, leading to larger device sizes and interference from excitation light.
Innovation Solution
A biometric device configuration where the light source unit and light-reception unit are arranged to face separate parts on the organism's surface, with the excitation light applied in a direction inclined to the surface and received in a direction perpendicular to it, utilizing a light shield and filters to isolate and collect fluorescence light efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light source unit and light-reception unit are arranged to face the same target region, then the entire target region can be irradiated with excitation light, but a large space is needed between the light source, light-reception unit, and organism, resulting in a large device size
Solution Approach 1:
The patent transitions from a conventional configuration where the light source and light-reception unit face the same target region to a configuration where they face different regions (first part and second part respectively). This spatial reconfiguration in another dimension allows both units to be positioned close to the organism without requiring large spacing, thereby reducing device size while maintaining effective fluorescence measurement capability
Solution Approach 2:
The patent divides the measurement process into two spatially separated components: excitation light application at the first part and fluorescence light reception at the second part. This segmentation allows independent optimization of each unit's position and function, enabling compact device design while preserving measurement precision
2Measurement precision
If the light source unit irradiates the organism with excitation light, then biometric measurement can be performed, but excitation light interference with the light-reception unit occurs
Solution Approach 1:
The patent extracts the harmful excitation light from the reception path by positioning the light-reception unit to face a different region (second part) than the excitation light application region (first part). This spatial separation removes the interference source from the detection path, allowing accurate fluorescence light reception without excitation light contamination
Solution Approach 2:
The patent introduces spatial separation as an intermediary mechanism between the light source and light-reception unit. By positioning them to face different parts of the organism, the spatial arrangement acts as a mediator that prevents direct line-of-sight interference while still enabling effective fluorescence measurement through the organism's light scattering properties
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 allows for the downsizing of biometric devices while improving the efficiency of excitation light application and fluorescence collection, reducing noise interference and enhancing measurement precision.
Implementation Method 1
a light source unit arranged facing a first part on a surface of an organism and configured to irradiate the first part with excitation light
Implementation Method 2
fluorescence light which is generated by the excitation light exciting a first body substance of the organism and emitted from the second part
Data Source
AI summary
Provided is a biometric device including a light source unit arranged facing a first part on a surface of an organism and configured to irradiate the first part with excitation light, and a light-reception unit arranged facing a second part adjacent to the first part on the surface of the organism and configured to receive fluorescence light which is generated by the excitation light exciting a first body substance of the organism and emitted from the second part.