Liquid Ejecting Head Wiring for Voltage Consistency
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Solution Overview
Problem
The existing liquid ejecting heads experience variations in voltage supply to actuators, leading to inconsistent liquid ejection among nozzles due to the placement of common line mounting portions at the ends, resulting in reduced reliability.
Innovation Solution
The liquid ejecting head design includes a wiring member that supplies voltage to individual and common electrodes, with the wiring member being electrically coupled to the common lines at positions shifted relative to the center of the pressure chambers, thereby minimizing voltage drops and maintaining consistent ejection across nozzles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If common line mounting portions are located at end portions of common lines, then wiring structure is simplified and manufacturing is easier, but voltage supplied to actuators varies significantly along the first direction causing inconsistent liquid ejection
Solution Approach 1:
The patent divides the single common line into multiple common lines (first common line, second common line, etc.) arranged in the first direction. Each common line serves a specific region of pressure chambers, segmenting the voltage supply path to reduce voltage variation along the line. This segmentation maintains manufacturing simplicity while improving voltage distribution uniformity for consistent liquid ejection.
Solution Approach 2:
The patent implements local optimization by positioning common line mounting portions at different locations corresponding to different regions of the pressure chambers. Each common line is electrically coupled to the wiring member at a position appropriate for its served region, ensuring that voltage is supplied efficiently to local groups of actuators. This local quality approach reduces voltage drop variations while maintaining overall system manufacturability.
2Device complexity
If common line mounting portions are positioned to simplify wiring, then device complexity is reduced, but voltage drop variation among actuators increases leading to ejection inconsistency
Solution Approach 1:
The patent segments the common line into multiple parallel common lines, each serving a specific region. This segmentation reduces the length of individual common lines, thereby reducing voltage drop variation along each line while maintaining a relatively simple overall wiring configuration. The segmented structure balances device complexity with voltage supply uniformity.
Solution Approach 2:
The patent aims to achieve equipotential conditions across different regions by strategically positioning common line mounting portions. By ensuring that each common line has appropriate electrical coupling positions, the design reduces voltage potential differences between actuators in different regions, improving voltage supply uniformity without significantly increasing device complexity.
3Ease of operation
If voltage is supplied through end-located common line mounting portions, then wiring layout is simplified, but voltage variation along the first direction causes nozzle ejection variation
Solution Approach 1:
The patent divides the voltage supply path into multiple segmented common lines, each serving a specific region of nozzles. This segmentation simplifies the wiring layout for each segment while ensuring that voltage variation is minimized within each regional group. The segmented approach maintains ease of wiring operation while improving overall nozzle ejection consistency.
Solution Approach 2:
The patent implements region-specific wiring optimization by positioning common line mounting portions to serve local groups of nozzles effectively. Each common line is configured with appropriate mounting positions for its served region, ensuring uniform voltage supply to local actuators. This local quality approach maintains overall wiring simplicity while achieving consistent nozzle ejection across different regions.
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 reliability of liquid ejection by reducing voltage variations between nozzles, ensuring consistent performance and improved operational stability.
Implementation Method 1
The actuators include individual electrodes provided to the pressure chambers, respectively, a common electrode provided to the individual electrodes in common, and piezoelectric bodies disposed in a space between the individual electrodes and the common electrode
Data Source
AI summary
A liquid ejecting head includes a line of first pressure chambers, a line of second pressure chambers, a line of nozzles including nozzles arranged in a first direction, first piezoelectric bodies, first individual electrodes, a first common electrode, second piezoelectric bodies, second individual electrodes, a second common electrode, a wiring member, a first individual line that electrically couples the first individual electrode to the wiring member, a first common line that electrically couples the first common electrode to the wiring member, a second individual line that electrically couples the second individual electrode to the wiring member, and a second common line that electrically couples the second common electrode to the wiring member. The wiring member is electrically coupled to the first common line at a position shifted to one side in the first direction relative to a center in the first direction of the lines of first and second pressure chambers, and the wiring member is electrically coupled to the second common line at a position shifted to another side in the first direction relative to the center in the first direction of the lines of first and second pressure chambers.