Pulse Wave Sensor Pressing Mechanism with Guide Pins
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Solution Overview
Problem
Existing biometric information measurement devices face challenges in uniformly pressing a pulse wave detection sensor against the body surface at a stabilized pressure due to concentrated stress, which affects detection accuracy.
Innovation Solution
A pulse wave detector with a configuration that includes four guide pins supported by a housing, a pressing member with an air bag, and a rotation driving section, allowing the sensor to be pressed against the body surface at a stabilized pressure through controlled air pressure and guided movement, ensuring consistent contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single guide rod is used to move the pressing member, then the device structure is simple, but the stress concentrates at the circumference of the pressing member causing unstable detection surface
Solution Approach 1:
The single guide rod is segmented into multiple guide pins (at least three) distributed around the pressing member. This segmentation distributes the guiding function across multiple points, preventing stress concentration at any single location and ensuring stable detection surface during pressing operation.
Solution Approach 2:
The guiding mechanism transitions from a single-point (one-dimensional) guide rod to a multi-point (two-dimensional) distribution of guide pins around the pressing member. This dimensional change allows stress to be distributed across multiple locations, improving stability while maintaining structural simplicity.
2Ease of manufacture
If the pressing member is moved along a single guide rod, then the manufacturing cost is low, but the detection accuracy decreases due to non-uniform pressure distribution
Solution Approach 1:
The single guide rod is divided into multiple guide pins positioned at different locations around the pressing member. This segmentation enables uniform pressure distribution across the detection surface, improving pulse wave detection accuracy while keeping the manufacturing process simple and cost-effective.
Solution Approach 2:
Guide pins are positioned at specific locations around the pressing member to ensure uniform pressure distribution across different regions of the detection surface. This local quality approach ensures that each area of the detection surface receives appropriate pressure, improving overall measurement precision.
3Device complexity
If the detection surface is not uniformly pressed, then the pressing mechanism is simple, but the biometric information measurement accuracy is compromised
Solution Approach 1:
The pressing mechanism uses multiple guide pins instead of a single guide rod, creating multiple contact points that distribute the pressing force uniformly across the detection surface. This segmentation approach maintains relative structural simplicity while achieving uniform pressure distribution for accurate biometric measurement.
Solution Approach 2:
The guide pins are positioned and dimensioned to create equipotential pressure distribution across the detection surface during pressing. This ensures that all areas of the detection surface experience equivalent pressing conditions, improving the accuracy of biometric information measurement without significantly increasing device complexity.
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 enables accurate and stable detection of pulse waves by maintaining uniform pressure on the body surface, improving the accuracy of biometric information measurement.
Implementation Method 1
a pressing mechanism which moves the pulse wave detection sensor in one direction by supplying a fluid such as the air
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
There is provided a pulse wave detector and biometric information measurement device in which a pulse wave detection sensor can be pressed against the body surface at a stabilized pressure. A pulse wave detector 10 includes: a pulse wave detection sensor 30; a pressing member 32 which supports the pulse wave detection sensor 30 and which is moved in a direction Z to press the pulse wave detection sensor 30 against the body surface of the measurement subject; four guide pins 27 which are placed around the pulse wave detection sensor 30 in a plan view as seen in the direction Z and extend in the direction Z; and a housing 20 which supports the four guide pins 27. The pressing member 32 has slide portions 321 through which the guide pins 27 are passed to be movable respectively along the four guide pins 27 in the direction Z.