Biometric Detection Device With Light-Shielding Housing
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Solution Overview
Problem
Existing detection devices that use optical sensors struggle to accurately measure biometric information such as pulsation and blood oxygen saturation levels due to interference from external light sources.
Innovation Solution
The detection device incorporates a housing with a light-shielding outer surface and light-transmitting inner surface, featuring separate areas for light emission and external light detection. This design includes first optical sensors for measuring biometric data and second optical sensors positioned to detect external light, which are configured to minimize external light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the optical sensor receives external light in addition to light from the light source, then the device can operate with simpler light shielding, but the detection precision deteriorates due to detecting wrong wavelengths
Solution Approach 1:
The housing is divided into a light-shielding outer surface and a light-transmitting inner surface, creating distinct functional zones. The outer surface blocks external light while the inner surface allows measurement light to pass through to the sensor, resolving the contradiction between manufacturing simplicity and detection precision.
Solution Approach 2:
Different surfaces of the housing have different optical properties: the outer surface is light-shielding while the inner surface is light-transmitting. This local differentiation allows the device to block external light interference while maintaining transmission of measurement light, improving detection accuracy without complicating the overall structure.
2Measurement precision
If separate areas are used for light emission and external light detection, then external light interference is reduced, but the device complexity increases
Solution Approach 1:
The housing serves multiple functions simultaneously: it provides structural support, shields external light through its outer surface, transmits measurement light through its inner surface, and houses both the light source and optical sensors in separate areas. This multi-functionality reduces device complexity while maintaining detection precision.
Solution Approach 2:
The light-shielding and light-transmitting functions are merged into a single housing structure with different surface properties, rather than using separate components. This integration maintains measurement precision while avoiding the complexity of additional light-shielding elements.
3Measurement precision
If the housing fully shields external light, then measurement accuracy improves, but the light source cannot effectively illuminate the measurement target
Solution Approach 1:
The housing has different optical properties at different locations: the outer surface is light-shielding to block external light, while the inner surface is light-transmitting to allow the light source to illuminate the measurement target effectively. This local differentiation resolves the contradiction between measurement precision and light emission effectiveness.
Solution Approach 2:
The housing is segmented into light-shielding and light-transmitting regions, creating a controlled optical environment that blocks external interference while maintaining effective illumination of the measurement target by the light source.
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 effectively reduces the impact of external light on biometric measurements, enhancing the accuracy of pulsation and blood oxygen saturation level detection without increasing the number of light sources or sensors, thus maintaining cost-effectiveness.
Implementation Method 1
a housing (200) having a first outer circumferential surface (210) with a light-shielding property and a second inner circumferential surface (220) with a light-transmitting property
Implementation Method 2
a first optical sensor (10A) provided inside the first area (200A) of the housing (200) and capable of receiving light from the second surface (220)
Implementation Method 3
a second optical sensor (10B) provided inside a second area (200B) different from the first area (200A) of the housing (200)... The second optical sensor (10B) configured to receive light from the opening (230)
Implementation Method 4
a housing (200) having a first outer circumferential surface (210) with a light-shielding property
Data Source
AI summary
A detection device includes: a housing having a first surface with a light-shielding property and a second surface with a light-transmitting property; a light source provided inside a first area of the housing and configured to emit light from the second surface contacting a measurement target such that the light travels toward the measurement target; a first optical sensor provided inside the first area and capable of receiving light from the second surface; and a second optical sensor provided inside a second area different from the first area of the housing. The housing has an opening formed in the first surface of the second area and that allows light from an outside of the housing to pass therethrough to an inside of the housing. The second optical sensor configured to receive light from the opening and has a side that faces the second surface and is shielded from light.