Pulse Wave Sensor Static Discharge Grounding
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Solution Overview
Problem
The existing pulse wave measurement devices face accuracy issues due to increased thickness caused by overlapping conductive and silicone rubber, which can lead to static electricity generation and reduced accuracy in pressure pulse wave detection.
Innovation Solution
A pulse wave measurement device configuration featuring a semiconductor substrate with a pressure-sensitive element, a rigid substrate, a flexible substrate with wiring, and an insulating protective layer that minimizes thickness and eliminates static electricity by grounding exposed terminals, allowing the pressure-sensitive surface to be pressed against the body while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electrically conductive rubber and silicone rubber are overlapped to suppress static electricity, then static electricity generation is reduced, but the thickness in the pressing direction is increased
Solution Approach 1:
The patent extracts the static electricity suppression function from the overlapping rubber structure and implements it through a separate grounding terminal connected to the protective layer. This removes the need for thick overlapping rubber layers while maintaining static electricity suppression capability.
Solution Approach 2:
The patent introduces a grounding terminal as an intermediary element that connects the protective layer to ground potential. This mediator provides a dedicated path for static electricity discharge without requiring the protective layer itself to be conductive, thus maintaining thin dimensions.
2Reliability
If the thickness of the protective layer is increased to protect the semiconductor substrate, then protection capability is improved, but the accuracy of pressure pulse wave detection is reduced
Solution Approach 1:
The patent changes the electrical parameter of the protective layer by connecting it to ground potential through a terminal, rather than changing its physical thickness. This allows the protective layer to maintain both adequate thickness for protection and sufficient thinness for accurate pressure detection.
Solution Approach 2:
The patent establishes equipotentiality between the protective layer and ground by connecting them through a terminal. This eliminates potential differences that could interfere with pressure sensing while maintaining the protective layer's physical integrity and thickness.
3Object-affected harmful factors
If electrically conductive material is placed on the surface contacting the living body, then static electricity is suppressed, but the device complexity is increased
Solution Approach 1:
The patent segments the static electricity suppression function into a separate grounding terminal component, distinct from the protective layer and sensor elements. This modular approach simplifies the overall structure by assigning specific functions to separate components rather than requiring complex integrated solutions.
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 reduces the thickness of the device, eliminates static electricity interference, and enhances the accuracy of pressure pulse wave detection, improving the reliability of health monitoring.
Implementation Method 1
a sensor chip which uses a distortion gauge and a diaphragm, as a pressure-sensitive element
Implementation Method 2
a terminal which is held at a potential equal to a potential of the semiconductor substrate, and which is outwardly exposed in a position different from the connector, the outwardly exposed terminal is in contact with the protective layer
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A pulse wave measurement device in which an influence of static electricity due to friction with the skin can be eliminated, and the accuracy of detecting a pressure pulse wave can be improved is provided. The device includes: a pressure pulse wave sensor 1 that includes: a semiconductor substrate 10A on which pressure-sensitive elements S and terminal portions 10B, 10C that are electrically connected to the pressure-sensitive element S are formed; and a rigid substrate 11 which includes terminal portions 11B, 11C that are electrically connected to the terminal portions 10B, 10C, and to which the semiconductor substrate 10A is fixed, the pressure pulse wave sensor to be used while a pressure-sensitive surface on which the pressure-sensitive elements S are formed is pressed against the body surface of a living body; a flexible substrate 16 which includes wirings that are electrically connected to the terminal portions 11B, 11C, and to which the rigid substrate 11 is fixed; and a surface coating layer 15 which is configured by an insulating material, and which covers and protects the semiconductor substrate 10A. The flexible substrate 16 includes terminals G1, G2 which are held at a potential equal to that of the semiconductor substrate 10A, and which are outwardly exposed. The terminals G1, G2 are in contact with the surface coating layer 15.