Multilayer Piezoelectric Device Electrode Design for Uniform Response
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Solution Overview
Problem
The existing multilayer piezoelectric devices used in inkjet printers exhibit variations in displacement due to differences in time constants among driving parts, caused by unequal resistance values in conducting paths, leading to inconsistent performance.
Innovation Solution
The multilayer piezoelectric device design includes strategically arranged inner and outer electrodes to create equal stray capacitance and resistance values across driving parts, ensuring uniform time constants and responses, thereby suppressing displacement variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conducting path length is increased to connect inner electrodes to outer electrodes, then the electrical connection is achieved, but the resistance value increases causing variations in time constants among driving parts
Solution Approach 1:
The patent introduces a conductive paste layer as an intermediary substance between the inner electrodes and outer electrodes. This conductive paste fills the grooves and provides a low-resistance connection path, mediating the electrical connection while maintaining uniformity across all driving parts regardless of their position.
Solution Approach 2:
The patent changes the electrical resistance parameter by introducing the conductive paste material with specific conductive properties. This material parameter change ensures that all conducting paths have equal resistance values, thereby equalizing the time constants of all driving parts and eliminating response variations.
2Shape
If the driving parts are positioned at different distances from the non-driving part, then the device structure is formed, but the conducting path lengths become unequal causing resistance variations
Solution Approach 1:
The patent applies local quality by positioning conductive paste specifically in the grooves between inner electrodes and outer electrodes at each driving part location. This localized application ensures that each conducting path has uniform resistance characteristics independent of its length or position in the device structure.
Solution Approach 2:
The patent solves the path length issue by transitioning from a direct linear connection to a three-dimensional connection through grooves filled with conductive paste. This dimensional change allows electrical connection through a different spatial route that equalizes resistance across all driving parts regardless of their positional distance.
3Ease of manufacture
If unequal resistance values exist in conducting paths, then the device can be manufactured with simple structure, but time constants vary among driving parts causing displacement variations
Solution Approach 1:
The patent applies homogeneity by using the same conductive paste material and groove structure for all driving parts throughout the device. This uniform approach ensures that all conducting paths have equal resistance values, making the time constants homogeneous across all driving parts while maintaining manufacturing simplicity through a standardized structure.
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 design achieves consistent responses and reduced displacement variations among driving parts, enhancing the reliability and performance of the multilayer piezoelectric device.
Implementation Method 1
a multilayer body formed from a plurality of piezoelectric layers stacked along a first direction
Data Source
AI summary
A multilayer piezoelectric device comprises a multilayer body and first and second outer electrodes. The multilayer body has base, first and second driving parts, and non-driving part. The driving parts and non-driving part extend from the base along stacking direction. The first driving part is closer to the non-driving part than the second driving part. Each driving part has first and second inner electrodes opposing each other in stacking direction. The base has a third inner electrode extending along a plane orthogonal to the stacking direction. The first outer electrode is connected to the first inner electrode. The second outer electrode is connected to the second and third inner electrodes. In the stacking direction, the overlap area of the third and second inner electrode of the first driving part is greater than the overlap area of the third and second inner electrode of the second driving part.