Biological Information Measuring Module Frame Height Optimization
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Solution Overview
Problem
Existing wrist-worn biological information measuring devices face challenges in accurately measuring pulse waves due to inadequate configuration of light emitting and receiving portions, leading to issues with portability, miniaturization, and weight reduction, as well as suboptimal signal-to-noise ratio.
Innovation Solution
A biological information measuring module with a light receiving portion, frame, and support portion, where the height difference between the light receiving portion and the frame is set within specific ranges to ensure accurate light reception, and the frame's width is optimized between 3.0 mm and 4.5 mm to balance accuracy and portability, with the frame's shape and position configured to enhance light collection and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between the skin surface and the light receiving portion is optimized for accurate measurement, then measurement precision is improved, but the device complexity increases due to detailed configuration requirements
Solution Approach 1:
The patent applies parameter changes by establishing specific quantitative relationships between the frame width L and the height difference Δh. By defining Δh within the range of 0.016L to 0.039L (or more preferably 0.020L to 0.025L), the patent transforms the complex configuration problem into a standardized parameter setting problem, ensuring accurate light reception while simplifying the design process.
Solution Approach 2:
The patent implements preliminary action by pre-establishing the optimal geometric configuration of the light receiving portion relative to the frame. The height difference Δh is predetermined based on the frame width L, allowing the device to achieve accurate measurement without requiring complex real-time adjustments or configurations during use.
2Measurement precision
If the frame width is increased to improve light collection, then measurement precision is improved, but portability and miniaturization are worsened
Solution Approach 1:
The patent resolves this contradiction through parameter optimization by establishing that the frame width L should be within the range of 3.0 mm to 4.5 mm. This specific parameter range achieves the optimal balance between light collection capability (improving signal-to-noise ratio) and device miniaturization (maintaining portability), eliminating the need for larger frames.
Solution Approach 2:
The patent applies partial action by setting the frame width to a moderate range (3.0-4.5 mm) that provides sufficient light collection for accurate measurement without excessive size. This partial optimization achieves the necessary measurement precision while maintaining portability, avoiding the need for overly large frames that would compromise miniaturization.
3Measurement precision
If the height difference between the light receiving portion and the frame is precisely controlled, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent reduces manufacturing precision requirements by establishing a proportional relationship between the frame width L and the height difference Δh. By defining Δh within the range of 0.016L to 0.039L (or 0.020L to 0.025L), the patent allows the height difference to scale with the frame width, providing a manageable tolerance range that is easier to control during manufacturing while still ensuring accurate light reception.
4Weight of moving object
If the device is miniaturized for portability, then weight and size are reduced, but measurement precision deteriorates
Solution Approach 1:
The patent resolves this contradiction through optimized parameter setting by defining the frame width L within 3.0 mm to 4.5 mm and the height difference Δh within 0.016L to 0.039L. These parameter ranges enable the device to maintain miniaturization for portability while ensuring sufficient light collection area and optimal geometric configuration for accurate pulse wave measurement, thus achieving both weight reduction and measurement precision.
Solution Approach 2:
The patent applies dimensional optimization by carefully controlling the three-dimensional configuration of the light receiving portion relative to the frame. By optimizing the height difference Δh in the vertical dimension while maintaining an appropriate frame width L in the horizontal dimension, the patent achieves accurate measurement in a compact volume, effectively utilizing spatial dimensions to reconcile miniaturization with measurement precision.
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 module achieves accurate biological information measurement while maintaining portability and reducing the adverse effects of exercise, by optimizing the light receiving and emitting configurations, thereby improving the signal-to-noise ratio and measurement stability.
Implementation Method 1
biological information, such as a pulse wave, is obtained by optically measuring the blood flow of the skin surface
Implementation Method 2
a light receiving portion that receives light having passed through a target
Data Source
AI summary
A biological information measuring device includes a sensor unit as a biological information measuring module. The sensor unit includes a substrate as a support portion that has a support surface and supports a light receiving portion and a second wall portion as a frame on the support surface. Assuming that the width of the second wall portion is L, a difference Δh between a height h from the support surface to the top surface of the light receiving portion and a height H from the support surface to the top surface of the second wall portion is expressed by Expression (1):5384×0.016×L4≤Δh≤5384×0.039×L4.(1)