Staggered Common Electrode Arrangement for Liquid Discharging Head
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Solution Overview
Problem
Existing liquid discharging heads with common electrodes having extending parts experience uneven electrical resistance, leading to delayed pulse rise and reduced droplet volume on the downstream side, resulting in uneven droplet density when multiple unit heads are arranged in a specific configuration.
Innovation Solution
The liquid discharging head is designed with a staggered arrangement of unit heads, where the extending directions of adjacent common electrodes are opposite to each other, and the electrodes are configured with specific potential receiving and extending parts to minimize the difference in electrical resistance across the extending parts, ensuring consistent droplet volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple unit heads are arranged with common electrodes having extending parts in the same direction, then the device complexity is reduced, but uneven electrical resistance occurs leading to uneven droplet density
Solution Approach 1:
Adjacent unit heads are arranged with opposite extending directions for their common electrodes, creating an asymmetric pattern that balances the electrical resistance distribution across the head assembly, thereby preventing uneven droplet density while maintaining a relatively simple overall structure
2Reliability
If the extending part of the common electrode is lengthened to cover more driving electrodes, then the electrical connection is improved, but the electrical resistance increases causing delayed pulse rise and reduced droplet volume
Solution Approach 1:
The common electrode structure is differentiated into a potential receiving part and an extending part with specific dimensional ratios, where the extending part has a controlled length relative to the potential receiving part. This local differentiation ensures adequate electrical connection while limiting resistance increase that would otherwise delay pulse rise and reduce droplet volume
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 configuration effectively suppresses unevenness in droplet density by maintaining consistent electrical resistance across the extending parts, ensuring uniform droplet discharge and improved printing quality.
Implementation Method 1
a first piezoelectric layer 41, a plurality of driving electrodes 51, and a common electrode 52. The plurality of driving electrodes 51 is arranged on a surface of the first piezoelectric layer 41
Data Source
AI summary
There is provided liquid discharging head having unit heads. Each of the unit heads includes: first piezoelectric layer, driving electrodes arranged on surface of the first piezoelectric layer and to each of which one of first and second potentials is to be applied, and common electrode. The common electrode includes: potential receiving part configured to receive one of the first and second potentials; and extending part extending in extending direction orthogonal to the first direction, so as to overlap with the driving electrodes in the first direction. The unit heads are arranged so that the common electrodes of the plurality of unit heads are adjacent to each other in second direction orthogonal to the first direction. The extending directions of two of the common electrodes adjacent to each other in the second direction are opposite to each other.