Liquid Ejection Head Reinforcing Wiring Voltage Drop
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Solution Overview
Problem
In high-density liquid ejection recording systems, the increased number of drive wirings for piezoelectric transducers leads to reduced spacing between wirings, making arrangement difficult, and variations in voltage drops across common electrodes result in fluctuations in ejection energy and performance.
Innovation Solution
A liquid ejection head design featuring piezoelectric transducers arranged in columns with a common electrode and reinforcing wiring, where the drive wiring is connected to the common electrode via a laminated reinforcing wiring to suppress voltage drops and maintain consistent ejection energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large number of drive wirings are arranged at high density to support high-speed recording, then recording speed is improved, but the space between wirings is reduced making arrangement difficult
Solution Approach 1:
The patent merges the drive wiring substrate with the liquid ejection substrate by bonding them together, integrating the wiring arrangement with the ejection port arrangement. This consolidation reduces the need for separate external wirings and simplifies the overall structure while supporting high-density wiring configurations.
Solution Approach 2:
The patent transitions from planar wiring arrangement to a bonded substrate configuration where drive wirings are led in multiple directions (first direction and second direction perpendicular to the first) on the wiring substrate, utilizing two-dimensional wiring paths to reduce congestion and improve arrangeability.
2Device complexity
If a common electrode is used for all piezoelectric transducers to simplify connections, then connection complexity is reduced, but variations in voltage drops increase causing ejection performance fluctuations
Solution Approach 1:
The patent divides the common electrode into multiple first connection areas corresponding to different columns of piezoelectric transducers, with each area independently connected to the drive wirings. This local differentiation allows for optimized voltage distribution to each column, reducing voltage drop variations while maintaining the common electrode structure.
Solution Approach 2:
The common electrode is segmented into multiple first connection areas that are separately connected to different drive wirings, transforming a single common connection into multiple localized connections. This segmentation reduces the total resistance path for each column and minimizes voltage drop variations across different piezoelectric transducer columns.
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 solution effectively reduces variations in ejection energy and performance by minimizing voltage drops across the common electrode, ensuring consistent ejection speed and amount across all ejection ports.
Implementation Method 1
a piezoelectric transducer represented by piezoelectric zirconate titanate (PZT) is provided in a pressure chamber, and introduction and ejection of the liquid are performed by changing an inner volume of the pressure chamber
Data Source
AI summary
A liquid ejection head includes a plurality of piezoelectric transducers that are configured to generate energy for respectively ejecting liquid from a plurality of ejection ports and arranged in line so as to constitute a plurality of columns and a common electrode connected to the plurality of piezoelectric transducers. The common electrode is provided with a plurality of first connection areas to which the plurality of piezoelectric transducers are connected commonly in units of columns and a second connection area that connects the plurality of first connection areas to one another. This liquid ejection head further includes a reinforcing wiring laminated on the second connection area and a wiring substrate including a drive wiring that is connected to the reinforcing wiring at at least one connection point and electrically connected to the common electrode via the connection point.