Ultrasonic Sensor Electrode Width Ratio Optimization
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Solution Overview
Problem
Existing ultrasonic diagnostic apparatuses do not optimize the ratio of the width of the bottom electrode to the piezoelectric body, leading to suboptimal voltage output during reception and increased electric resistance, which affects the sensitivity and efficiency of ultrasonic wave detection.
Innovation Solution
An ultrasonic sensor design where the ratio of the width of the bottom electrode to the piezoelectric body is set between 0.1 and 0.8, with a specific configuration of electrode widths and shapes to enhance voltage generation and sensitivity, including a vibration plate with a circular, hexagonal, or elliptical outline, and controlled overlap between electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the bottom electrode is increased to reduce electric resistance, then electrical conductivity is improved, but the ratio of electrode width to piezoelectric body width becomes too large, causing short-circuiting and reduced voltage output
Solution Approach 1:
The patent optimizes the width ratio parameter Wbe/Wpz between the bottom electrode and piezoelectric body, establishing it within 0.1 to 0.8 (preferably 0.2 to 0.5). This parameter optimization simultaneously achieves low electric resistance and high voltage output without short-circuiting, resolving the contradiction between electrical conductivity and power output.
2Ease of manufacture
If the bottom electrode width is made equal to the piezoelectric body width for ease of manufacture, then manufacturing simplicity is improved, but voltage output during reception is reduced and electric resistance increases
Solution Approach 1:
The patent specifies that the bottom electrode width Wbe should be 0.1 to 0.8 times the piezoelectric body width Wpz (preferably 0.2 to 0.5 times), rather than being equal. This parameter change maintains manufacturing feasibility while significantly improving voltage output and reducing electric resistance, resolving the contradiction between ease of manufacture and power output.
3Reliability
If the bottom electrode extends beyond the piezoelectric body to prevent short-circuiting, then reliability is improved, but the width ratio becomes too large, reducing voltage generation efficiency
Solution Approach 1:
The patent establishes the optimal width ratio Wbe/Wpz between 0.1 and 0.8 (preferably 0.2 to 0.5), which ensures the bottom electrode is sufficiently wide to prevent short-circuiting while maintaining high voltage generation efficiency. This parameter optimization resolves the contradiction between reliability and power generation by finding the optimal balance point.
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 ensures a sufficient generated voltage during reception, maintains sensitivity within optimal ranges, and prevents short-circuiting, thereby improving the overall performance of the ultrasonic sensor in detecting ultrasonic waves.
Implementation Method 1
A piezoelectric body is laminated on the bottom electrode. A top electrode is laminated on the piezoelectric body.
Data Source
AI summary
An ultrasonic sensor includes a vibration plate, a first electrode, a piezoelectric body, and a second electrode. The first electrode is laminated on the vibration plate, that has a length along a surface of the vibration plate in a first direction, and that has a width Wbe along the surface of the vibration plate in a second direction that is orthogonal to the first direction. The width Wbe is not more than the length. The piezoelectric body is laminated on the first electrode and has a width Wpz in the second direction. The second electrode is laminated on the piezoelectric body. A ratio Wbe/Wpz between the width Wbe of the first electrode and the width Wpz of the piezoelectric body is not less than 0.1 and not more than 0.8.