Transducer with Variable Pitch Structure for Edge Detection
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Solution Overview
Problem
Existing transducers face challenges in achieving high resolution, particularly at the edges of paper sheets during inspection, due to attenuated acoustic waves and lower accuracy in detecting foreign matter like tape.
Innovation Solution
The transducer design incorporates a configuration with shorter pitch in the second structure sections compared to the first, improving resolution and simplifying the inspection device structure by reducing interconnects, allowing for enhanced detection of foreign matter at the paper edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uniform pitch is used in all structure sections, then device structure is simple, but resolution at paper edges is insufficient
Solution Approach 1:
The transducer applies local quality by assigning different pitch values to different structure sections. Specifically, the first structure section has a first pitch while the second structure section has a second pitch that is shorter than the first pitch. This allows the transducer to optimize resolution locally at paper edges where higher density sensing elements are needed, while maintaining simpler spacing in other regions.
2Measurement precision
If shorter pitch is used in second structure sections, then resolution is improved, but interconnect quantity increases
Solution Approach 1:
The patent merges interconnects by making the second conductive part share the same conductive structure as the first conductive part. Specifically, the second conductive part is formed as an extension or continuation of the first conductive part, allowing both structure sections to utilize common interconnect pathways. This reduces the total number of interconnects needed while still supporting the shorter pitch in the second structure section.
3Measurement precision
If higher resolution is achieved through denser structure sections, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The transducer implements local quality by concentrating the higher density structure sections specifically in regions where foreign matter detection is most critical, such as near paper edges. The first structure section has a first pitch suitable for general areas, while the second structure section has a shorter second pitch for enhanced detection accuracy in specific zones. This localized approach improves detection accuracy where needed without requiring the entire transducer to have high density, thereby controlling overall device complexity.
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 design enhances the accuracy of foreign matter detection at the paper edges and simplifies the inspection device structure, improving processing speed and resolution in transducer systems.
Implementation Method 1
a first piezoelectric part, a first conductive part, and a first electrode. The first conductive part is provided between at least part of the first membrane part and the first piezoelectric part
Data Source
AI summary
According to one embodiment, a transducer includes first structure sections and second structure sections. The first structure sections are spaced from each other in a first direction. Part of each of the first structure sections is fixed. The each of the first structure sections includes a first membrane part, a first piezoelectric part, a first conductive part, and a first electrode. The second structure sections are spaced from each other in the first direction. Part of each of the second structure sections is fixed. The each of the second structure sections includes a second membrane part, a second piezoelectric part, a second conductive part, and a second electrode. The second structure sections are spaced from the first structure sections in the first direction. Pitch along the first direction of the second structure sections is shorter than pitch along the first direction of the first structure sections.