Liquid Discharge Head Shared Flow Path Standing Wave Mitigation
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Solution Overview
Problem
Liquid discharge heads face issues with standing waves in shared flow paths, leading to fluctuations in discharge characteristics and periodic influences on printed images, particularly when attempting to increase resolution or miniaturize the device.
Innovation Solution
A liquid discharge head design with a shared flow path that has a larger cross-sectional area at both ends and a smaller middle segment, and a control system that drives the pressing parts at a frequency lower than the primary resonant vibration cycle, reducing the amplification of standing waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the density of liquid discharge pores is increased to print liquid drops with high density, then printing resolution is improved, but the cross-sectional area of the shared flow path must be decreased which causes standing waves and fluctuates discharge characteristics
Solution Approach 1:
The shared flow path is designed with non-uniform cross-sectional area, where the middle segment has a smaller cross-sectional area than the end segments. This local variation in geometry allows the flow path to have high density (for resolution) while the larger end segments prevent standing waves (for stability), resolving the contradiction between printing resolution and discharge characteristic stability.
2Volume of moving object
If the cross-sectional area of the shared flow path is decreased for miniaturization, then device size is reduced, but standing waves occur which periodically influence printed images
Solution Approach 1:
The shared flow path employs localized geometric variation with the middle segment having smaller cross-sectional area than the end segments. This design allows miniaturization in the middle region while the larger end segments act as standing wave suppressors, enabling small device size without periodic image degradation from standing waves.
3Productivity
If the driving frequency of displacement elements is increased to enhance resolution, then printing speed is improved, but standing waves are more strongly excited causing periodic discharge fluctuations
Solution Approach 1:
The shared flow path is designed with the middle segment having smaller cross-sectional area than the end segments. This geometric configuration raises the resonant frequency of the flow path, making it less susceptible to standing wave excitation at higher driving frequencies, thus enabling faster printing without periodic discharge fluctuations.
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 mitigates the influence of standing waves, enhancing recording accuracy and maintaining stable discharge characteristics, even at higher resolutions.
Implementation Method 1
the pressure applied to the liquid in the liquid pressing chambers is transferred to the shared flow path
Implementation Method 2
the liquid in the shared flow path resonates therewith, and a standing wave occurs in the shared flow path
Implementation Method 3
a plurality of pressing parts for respectively pressing liquid in the plurality of liquid pressing chambers
Data Source
AI summary
Providing is a liquid discharge head less susceptible to a standing wave occurred in a shared flow path; a liquid discharge device using the liquid discharge head; and a recording apparatus. The liquid discharge head includes a plurality of liquid discharge pores; a plurality of liquid pressing chambers 210 respectively connected to the plurality of liquid discharge pores; a shared flow path 205a being long in one direction and being linked the plurality of liquid pressing chambers 210; a liquid supply path 205c which is connected to both ends of the shared flow path 205a, and has a larger cross-sectional area than the shared flow path 205a; and a plurality of pressing parts for respectively pressing liquid in the plurality of liquid pressing chambers 10. The cross-sectional area of a middle segment of the shared flow path 205a is smaller than the cross-sectional area of that of each of both end segments thereof.