Pulse Wave Sensor Durability via Filling Material Stress Distribution
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Solution Overview
Problem
Existing biological information measurement devices face durability issues when used for extended periods due to the high force applied to the sensor chip, leading to potential damage and increased manufacturing costs.
Innovation Solution
A pressure pulse wave sensor with sensor chips and a protection member, where the protection member has opening sections opposite to the detection faces, filled with a filling material, and an air bag and rotation mechanism for adjusting the sensor's position to reduce stress on the chip, combined with a biological information calculation section for accurate data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor chip protrudes from the opening of the protection plate to enable direct contact with the wrist for pulse wave detection, then the detection function is improved, but the durability of the sensor chip deteriorates due to large applied force during long-term wear
Solution Approach 1:
The patent introduces a filling material as an intermediary substance between the sensor chip and the wrist. This filling material absorbs and distributes the contact force, preventing direct concentration of stress on the sensor chip while still allowing effective pulse wave detection through the protective structure.
Solution Approach 2:
The patent applies cushioning material in advance within the protection plate structure to preemptively reduce the impact force before it reaches the sensor chip. This beforehand cushioning ensures that even during prolonged wear, the sensor chip is protected from excessive force that would compromise its durability.
2Reliability
If the sensor chip is protected by a protection plate with openings, then the sensor chip durability is improved, but the manufacturing complexity increases due to multiple components assembly
Solution Approach 1:
The patent merges the protection plate and the filling material into an integrated protective structure. By combining these components into a unified design where the filling material is contained within the protection plate, the assembly process is simplified while maintaining the protective function and reducing overall structural complexity.
3Measurement precision
If the sensor chip surface makes dominant contact with the wrist for detection, then the detection accuracy is improved, but the force applied to the sensor chip becomes too large reducing its service life
Solution Approach 1:
The filling material serves as a mediator that transmits the pulse wave signal from the wrist to the sensor chip while filtering out excessive contact force. This intermediary layer enables accurate detection to continue over extended periods by protecting the sensor chip from force-related degradation.
Solution Approach 2:
The patent changes the physical parameters of the contact interface by introducing a compliant filling material with appropriate elasticity and damping characteristics. This parameter modification allows the system to maintain detection sensitivity while reducing the peak force transmitted to the sensor chip, thereby extending its service life.
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 solution enhances the durability of the sensor chip, allowing for long-term use while reducing manufacturing costs and improving user comfort by distributing pressure effectively around the wrist.
Implementation Method 1
the space between the opening sections and the detection faces is filled with a filling material
Data Source
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AI summary
The present invention provides a pressure pulse wave sensor capable of ensuring sufficient durability in the case of wearing the sensor for a long time and capable of suppressing manufacturing cost and a biological information measurement device equipped with this sensor. The pressure pulse wave sensor 10 is equipped with sensor chips 22 having pressure detection elements 24; a substrate 50 to which the sensor chips 22 are fixed; a protection cover 40 for protecting the substrate 50 and the sensor chips 22. The outer peripheral face of the protection cover 40 has a top face 41 that is disposed above the pressure detection elements 24 in the Z-direction perpendicular to the detection faces 26 of the sensor chips 22 and is parallel with the detection faces 26. In the protection cover 40, opening sections 42 passing through from the positions of the top face 41 opposed to the detection faces 26 toward the detection faces 26 are formed, and the space between the opening sections 42 and the detection faces 26 is filled with a filling material 55.