Pulse Wave Detection Arrays for Loose-Fit Wear Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional smart watches with photoelectric pulse wave sensors face accuracy degradation due to sensor displacement from the blood vessel position, necessitating tight belt fastening which compromises comfort.
Innovation Solution
A pulse wave detecting device with a sensor substrate featuring light emitting and receiving elements arranged in specific rows and a microcomputer unit that adjusts light outputs to maintain accuracy despite displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the belt is tightly fastened to fix the photoelectric pulse wave sensor, then the detection accuracy is improved, but the wearing comfort is deteriorated
Solution Approach 1:
The sensor substrate is divided into multiple regions with different light emitting elements and light receiving elements arranged in specific patterns. This segmentation allows the sensor to detect pulse waves from multiple positions simultaneously, maintaining detection accuracy even when the sensor is displaced due to loose belt fastening.
Solution Approach 2:
The patent transitions from a single-point detection approach to a multi-point array detection approach by arranging light emitting elements and light receiving elements in rows and columns. This dimensional expansion enables the sensor to capture pulse wave signals from multiple locations, compensating for displacement effects.
2Ease of operation
If the belt is loosely fastened for comfort, then the wearing comfort is improved, but the detection accuracy is deteriorated due to sensor displacement
Solution Approach 1:
Different regions of the sensor substrate have different configurations of light emitting elements and light receiving elements. This local quality variation allows the sensor to adapt to different positions on the blood vessel, maintaining detection accuracy across a range of displacements caused by loose fastening.
Solution Approach 2:
The patent varies the arrangement parameters of light emitting elements and light receiving elements across different regions of the sensor substrate. By changing spatial parameters such as element spacing and row/column positioning, the sensor maintains optimal detection performance despite displacement from the ideal blood vessel position.
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
Ensures high accuracy in pulse wave detection even with loose belt fitting, maintaining comfort and reducing sensor displacement effects.
Implementation Method 1
The plurality of light emitting elements are arranged in one row on a principal surface of the sensor substrate and configured to emit light
Implementation Method 2
The plurality of light receiving elements are arranged in one row parallel with the row of the plurality of light emitting elements on the principal surface and configured to receive return light
Implementation Method 3
utilizing a light absorbing characteristic of hemoglobin in the blood
Data Source
AI summary
A pulse wave detecting device includes a sensor substrate, a plurality of light emitting elements, a plurality of light receiving elements, and a processing circuit. The plurality of light emitting elements are arranged in one row on a principal surface of the sensor substrate and configured to emit light. The plurality of light receiving elements are arranged in one row parallel with the row of the plurality of light emitting elements on the principal surface and configured to receive return light. The processing circuit is configured to change light outputs of the plurality of light emitting elements differently for each light emitting element based on first signals output by at least two light receiving elements of the plurality of light receiving elements, and detect a pulse wave based on second signals output by the plurality of light receiving elements after the changing of the light outputs.