Piezoelectric Substrate Attachment Structure with Stiffness Gradient
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Solution Overview
Problem
Piezoelectric detectors with wavy-shaped piezoelectric cables increase complexity and production costs, necessitating a solution to maintain sensitivity while shortening the length of the piezoelectric substrate.
Innovation Solution
A piezoelectric substrate attachment structure with a cable-shaped substrate, a press section, and a base section, where the Young's modulus ratio of the base to the press section is 10−1 or lower, allowing for a shorter substrate length without compromising sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the piezoelectric cable is arranged in a wavy shape to widen the detection range and secure detection sensitivity, then the detection sensitivity is improved, but the structure becomes more complicated and production costs are increased
Solution Approach 1:
The patent applies different Young's modulus values to different sections of the support structure. The press section has a higher Young's modulus (Ea) than the base section (Eb), creating a localized stiffness difference. This allows the press section to provide stable support for the piezoelectric substrate while the base section allows for controlled deformation, enabling straight-line arrangement without wavy configuration.
Solution Approach 2:
The patent changes the physical parameter (Young's modulus) of the support structure sections to achieve the desired functionality. By setting Eb/Ea ≤ 10^-1 and specifying Ea in the range of 10^-6 to 10^3 GPa and Eb in the range of 10^-7 to 10^1 GPa, the structure can maintain sensitivity with a straight-line piezoelectric cable arrangement, eliminating the need for wavy shapes.
2Adaptability or versatility
If the piezoelectric cable is arranged in a wavy shape to widen the detection range, then the detection range is improved, but the structure becomes more complicated and production costs are increased
Solution Approach 1:
The differentiated Young's modulus design allows the base section to deform more easily than the press section, enabling the structure to adapt to pressure applications while maintaining a simple straight-line piezoelectric substrate arrangement. This local flexibility difference provides detection range without structural complexity.
Solution Approach 2:
By controlling the Young's modulus ratio Eb/Ea ≤ 10^-1 and specifying appropriate ranges for Ea and Pb, the patent enables the support structure to provide both stability and adaptability, achieving widened detection range through parameter optimization rather than geometric complexity.
3Ease of manufacture
If the piezoelectric substrate length is shortened to simplify the structure and reduce production costs, then the manufacturing simplicity is improved, but the detection sensitivity may be compromised
Solution Approach 1:
The patent creates a localized stiff support environment at the press section where the piezoelectric substrate is most needed for detection, while allowing more flexibility at the base section. This concentrated support efficiency enables shorter substrate lengths without sacrificing sensitivity, as the support is optimized exactly where required.
Solution Approach 2:
The support structure uses composite construction with sections having different Young's modulus values, creating a functionally graded structure. This composite approach provides maximum support efficiency in the critical press section while allowing overall substrate length reduction, achieving both manufacturing simplicity and detection sensitivity.
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
Enables a shorter piezoelectric substrate length while maintaining high sensitivity, simplifying the structure and reducing production costs.
Implementation Method 1
a cable-shaped piezoelectric substrate (10), a press section (20A) provided adjacent to the piezoelectric substrate (10) and pressed from an opposite side from the piezoelectric substrate (10)
Data Source
AI summary
A piezoelectric substrate attachment structure including a cable-shaped piezoelectric substrate, a press section provided adjacent to the piezoelectric substrate and pressed from an opposite side from the piezoelectric substrate, and a base section provided adjacent to the piezoelectric substrate on an opposite side from the press section. A ratio Eb/Ea of a Young's modulus Eb of the base section to a Young's modulus Ea of the press section being 10−1 or lower.