Liquid Ejecting Head Nozzle Crosstalk Reduction
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Solution Overview
Problem
High-density nozzle configurations in liquid ejecting heads experience crosstalk issues, leading to errors in ink ejection characteristics due to pressure changes affecting adjacent pressure chambers.
Innovation Solution
The liquid ejecting head features a configuration with individual flow paths and common liquid chambers where the positions and orientations of connection ports between the chambers and flow paths are differently positioned along the axis, reducing crosstalk by minimizing the impact of pressure changes between adjacent flow paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of nozzles are formed with high density, then nozzle density is improved, but crosstalk occurs between adjacent pressure chambers causing errors in ink ejection characteristics
Solution Approach 1:
The liquid supply system is segmented into multiple common liquid chambers, each serving specific individual flow paths. This segmentation isolates pressure changes within each common liquid chamber, preventing crosstalk from propagating across all nozzles. The patent divides the common liquid chamber into first and second common liquid chambers, where each chamber supplies liquid to specific groups of nozzles, thereby reducing the impact of pressure variations on adjacent nozzles.
Solution Approach 2:
Different common liquid chambers are positioned at different locations relative to individual flow paths, creating local variations in liquid supply characteristics. The first opening connecting the first common liquid chamber to the first individual flow path is positioned differently from the second opening connecting the second common liquid chamber to the second individual flow path. This local differentiation allows each nozzle group to have optimized liquid supply characteristics while reducing crosstalk interference.
2Productivity
If nozzles are arranged in high density, then productivity is improved, but pressure changes in one pressure chamber affect adjacent pressure chambers causing crosstalk
Solution Approach 1:
The patent segments the liquid supply system into multiple common liquid chambers, each independently supplying liquid to specific individual flow paths. This segmentation creates isolated pressure zones that prevent pressure changes in one nozzle from affecting adjacent nozzles, thereby eliminating crosstalk while maintaining high-density nozzle arrangement for improved productivity.
Solution Approach 2:
The common liquid chambers act as intermediary elements between the liquid reservoir and individual nozzles. By introducing these intermediate chambers with specifically positioned openings, the system mediates pressure changes before they reach the nozzles, reducing the direct transmission of pressure variations between adjacent nozzles and minimizing crosstalk effects.
Data Source
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AI summary
A liquid ejecting head including a plurality of nozzles that eject a liquid along a first axis, a row of individual flow paths that includes a plurality of individual flow paths arranged in parallel along a second axis orthogonal to the first axis when viewed in a direction of the first axis, and a common liquid chamber that is commonly in communication with the plurality of individual flow paths. In the liquid ejecting head, the plurality of individual flow paths include a first individual flow path and a second individual flow path that are adjacent to each other in the row of individual flow paths, and a position of a first opening that is a connection port between the common liquid chamber and the first individual flow path and a position of a second opening that is a connection port between the common liquid chamber and the second individual flow path are different in the direction of the first axis.