Piezoelectric Actuator Connection Terminal Height Control
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Solution Overview
Problem
The increasing density of individual electrodes in piezoelectric actuators for inkjet recording heads leads to connection failures between the electrodes and the external circuit board due to insufficient warping of the circuit board, resulting in reduced reliability and efficiency.
Innovation Solution
The solution involves setting the maximum difference in height between connection terminals to 4 mm or less and using an anisotropic conductive material for the connecting layer between the connection terminals and the external circuit board, with a density of 50 to 200 electrodes per square centimeter, and employing a planarization process such as cutting, leveling, or polishing to ensure reliable contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the density of individual electrodes is increased to achieve high-speed and precise printing, then the printing speed and precision are improved, but connection failures occur between the electrodes and the external circuit board due to insufficient warping of the circuit board
Solution Approach 1:
The patent controls the height difference parameter of connection terminals within a specific range (0.1 mm or less) to ensure reliable electrical connections. By adjusting this critical dimension parameter, the invention resolves the contradiction between high electrode density and connection reliability, enabling both high printing speed and stable electrical connections.
Solution Approach 2:
The patent applies different height characteristics to different parts of the connection terminals. Specifically, the connection terminals are designed with controlled height differences relative to the circuit board surface, creating local quality variations that ensure reliable contact points while maintaining overall high-density electrode arrangement.
2Measurement precision
If the density of individual electrodes is increased to achieve high-speed and precise printing, then the printing speed and precision are improved, but connection failures occur due to insufficient warping of the circuit board
Solution Approach 1:
The patent controls the height difference parameter of connection terminals within a specific range (0.1 mm or less) to ensure reliable electrical connections. By adjusting this critical dimension parameter, the invention resolves the contradiction between high electrode density and connection reliability, enabling both high printing precision and stable electrical connections.
3Productivity
If individual electrodes are arranged with constant pitch to increase density, then the printing speed and precision are improved, but the variation of deformation amount increases leading to connection failures
Solution Approach 1:
The patent controls the height difference parameter of connection terminals within a specific range (0.1 mm or less) to ensure reliable electrical connections. By adjusting this critical dimension parameter, the invention resolves the contradiction between high electrode density and connection reliability, enabling both high printing speed and stable electrical connections.
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 approach enhances the reliability of connections between individual electrodes and the external circuit board, allowing for high-density electrode arrangement without connection failures, enabling high-speed and precise printing in inkjet recording heads.
Implementation Method 1
ink in the ink pressuring chambers 53a is pressurized by applying a driving voltage across the common electrode 64 and the individual electrodes 66 and thus vibrating the displacement elements 67
Implementation Method 2
using an anisotropic conductive material for the connecting layer between the connection terminals and the external circuit board
Data Source
AI summary
A piezoelectric actuator that includes plural individual electrodes each of which includes a driving electrode and a connection terminal disposed at one end of the driving electrode. A maximum difference in height between the connection terminals is 4 μm or less.