Polymeric Piezoelectric Pressure Sensor with Optimized Mechanical Ratio
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Solution Overview
Problem
Current pressure detecting devices using polymeric piezoelectric materials lack high detection sensitivity, which limits their effectiveness in accurately sensing pressure applied to a contact surface.
Innovation Solution
A pressure detecting device is designed with a polymeric piezoelectric member having a piezoelectric constant d14 of 1 pm/V or more, where the ratio of cross-sectional secondary moment and Young's modulus of the pressurized member to the piezoelectric member is optimized between 102 to 1010, and further enhanced with a stabilizer containing functional groups like carbodiimide, epoxy, or isocyanate, to improve sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polymeric piezoelectric materials are used in pressure detecting devices, then environmental compatibility and flexibility are improved, but detection sensitivity is insufficient
Solution Approach 1:
The patent changes the piezoelectric material parameter by selecting materials with d14 ≥ 1 pm/V and optimizing the structural parameter IEb/IEa to achieve high detection sensitivity while maintaining environmental compatibility of polymeric materials
Solution Approach 2:
The patent uses composite structure combining pressurized member and piezoelectric member with optimized mechanical property ratio, achieving both environmental friendliness of polymers and high detection sensitivity
2Measurement precision
If the ratio IEb/IEa is optimized to improve detection sensitivity, then measurement precision is improved, but device structure becomes more complex
Solution Approach 1:
The patent defines specific parameter ranges (IEb/IEa = 10²-10¹⁰) that balance sensitivity improvement with structural simplicity, avoiding excessive complexity while achieving high detection 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 optimized configuration results in high detection sensitivity, allowing for precise detection of pressure applied to the contact surface, with a generated charge density per unit quantity of deflection significantly increased, particularly when the IEb/IEa ratio is within the range of 104 to 108.
Implementation Method 1
a piezoelectric member that is arranged facing the pressurized member and that includes a polymeric piezoelectric material having a piezoelectric constant d14 of 1 pm/V or more
Data Source
AI summary
The invention provides a pressure detecting device containing a pressurized member having a contact surface that is subjected to pressure due to contact with a pressurizing means; and a piezoelectric member that is arranged facing the pressurized member and that includes a polymeric piezoelectric material having a piezoelectric constant d14 of 1 pm/V or more as measured by a displacement method at 25° C., and a ratio IEb/IEa between a product IEb of a cross-sectional secondary moment Ib and a Young's modulus Eb of the pressurized member, and a product IEa of a cross-sectional secondary moment Ia and a Young's modulus Ea of the piezoelectric member, is in a range of from 102 to 1010.