Liquid Discharging Head with Segmented Pressure Chambers
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Solution Overview
Problem
The existing liquid discharging heads with densely arranged individual channels and small pressure chamber widths struggle to stably discharge highly viscous or special inks, leading to potential imbalance and deviation in dot arrangement on recording media, which lowers image quality.
Innovation Solution
A liquid discharging head configuration with each individual channel featuring a nozzle, at least two pressure chambers, and a connecting channel that applies discharge pressure uniformly, ensuring nozzles from different channel arrays are aligned at equal spacing, maintaining image quality by preventing imbalance in dot arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If individual channels are densely arranged with small pressure chamber width, then the head structure is compact, but stable discharge of highly viscous ink becomes impossible
Solution Approach 1:
The pressure chamber is divided into multiple segments (first pressure chamber, second pressure chamber, etc.) arranged in the first direction. Each segment can be independently controlled by separate actuators, allowing the total pressure chamber volume to be increased while maintaining a compact overall structure. This segmentation enables stable discharge of highly viscous ink by providing sufficient pressure generation volume without increasing the width of each individual chamber segment.
2Stress or pressure
If multiple pressure chambers are connected by connecting channel, then discharge pressure is increased, but nozzle alignment becomes imbalanced
Solution Approach 1:
The connecting channel is positioned asymmetrically within the individual channel structure, specifically arranged in the second direction (width direction) rather than centered in the first direction. This asymmetric positioning allows the connecting channel to link multiple pressure chambers while maintaining proper nozzle alignment in the first direction, preventing dot arrangement imbalance. The connecting channel extends in the second direction to connect pressure chambers without interfering with the nozzle's position relative to the pressure chamber array.
3Manufacturing precision
If nozzles are arranged at equal spacing, then image quality is maintained, but pressure chamber width must be increased
Solution Approach 1:
The connecting channel is positioned in the second direction (width direction) rather than the first direction (length direction). This dimensional repositioning allows the connecting channel to link multiple pressure chambers without increasing the width of individual pressure chambers. The connecting channel extends perpendicular to the nozzle array direction, enabling multi-chamber configuration while maintaining equal nozzle spacing and proper dot arrangement precision.
Data Source
AI summary
A liquid discharging head includes: a first individual channel array constructed of individual channels aligned in a first direction; and a second individual channel array constructed of individual channels aligned in the first direction. The second individual channel array is arranged side by side to the first individual channel array in a second direction orthogonal to the first direction. Each of the individual channels includes: a nozzle, at least two pressure chambers communicating with the nozzle and arranged in the first direction, and a connecting channel connecting the nozzle and the at least two pressure chambers. The connecting channel has one end in a third direction communicating with the at least two pressure chambers, and the other end in the third direction communicating with the nozzle.