Wearable Sensor Housing Groove for Biometric Light Cross-Talk
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Solution Overview
Problem
Existing wearable devices face challenges in accurately obtaining biometric information due to light cross-talk between light emitting and receiving units, which affects the reliability and precision of user state detection.
Innovation Solution
A wearable device design featuring a housing with a groove between the light emitting and receiving units, angled to reduce direct light transmission and enhance biometric data capture by refracting light away from the receiving unit, thereby minimizing cross-talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light emitting unit and light receiving unit are disposed close to each other in existing wearable devices, then the device structure is compact, but light cross-talk occurs between the units which deteriorates measurement precision
Solution Approach 1:
A light blocking structure is introduced as an intermediary element between the light emitting unit and light receiving unit. This structure selectively blocks direct light transmission (cross-talk) while allowing reflected light from the user's body to reach the receiving unit, thus resolving the contradiction between compact device size and measurement precision
Solution Approach 2:
The light blocking structure is positioned in a spatial dimension that creates a geometric relationship between the light emitting and receiving units. By angling the blocking structure, direct light paths are blocked while reflected light paths are preserved, enabling precise biometric detection in a compact form factor
2Measurement precision
If a light blocking structure is added between the light emitting unit and light receiving unit, then light cross-talk is reduced improving measurement precision, but the device complexity increases
Solution Approach 1:
The light blocking structure is merged with the housing body as an integrated feature rather than a separate component. The groove or protrusion is formed directly in the housing material, combining the housing structure with the light blocking function, thus improving measurement precision without proportionally increasing device complexity
Solution Approach 2:
The housing structure parameters (groove depth, protrusion height, angular orientation) are optimized to achieve effective light blocking with minimal structural complexity. By carefully controlling these geometric parameters, the design achieves high measurement precision while maintaining manufacturing feasibility
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 design effectively reduces light cross-talk, improving the accuracy and reliability of biometric information detection by enhancing the separation of light paths between the emitting and receiving units.
Implementation Method 1
A wearable device design featuring a housing with a groove between the light emitting and receiving units, angled to reduce direct light transmission and enhance biometric data capture by refracting light away from the receiving unit
Data Source
AI summary
A wearable device is provided. The wearable device includes a housing including a first side facing a part of a body of a user when the wearable device is worn by the user, and a second side opposite to the first side, and a sensor module disposed between the first side and the second side, the sensor module including a light-emitting unit and a light-receiving unit spaced apart from the light-emitting unit, wherein the housing includes a groove disposed between the light-emitting unit and the light-receiving unit and dent toward the second side from the first side.