Liquid Droplet Ejecting Head with Parallel High-Inertance Channel
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Solution Overview
Problem
Existing liquid droplet ejecting heads face challenges in preventing satellite droplets while maintaining a compact size, particularly due to limitations in reducing the channel cross-sectional area to increase inertance, which leads to increased head size.
Innovation Solution
The configuration includes a first channel with greater inertance than a second channel, extending parallel to the pressure chamber plane, allowing for increased length without enlarging the head's size, and effectively cutting high-order pressure waves to prevent satellite droplets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the channel cross-sectional area is reduced to increase inertance, then satellite droplet prevention is improved, but the head size increases in the first direction
Solution Approach 1:
The patent changes the orientation of the first channel from extending in the first direction (crossing the pressure chamber plane) to extending in the second direction (parallel to the pressure chamber plane). This dimensional reorientation allows the channel length to be increased without increasing the head size in the first direction, thereby maintaining compact dimensions while achieving the required inertance for satellite droplet prevention.
Solution Approach 2:
The patent modifies the geometric parameters of the first channel by increasing its length in the second direction and adjusting its cross-sectional area. This parameter change increases the inertance of the first channel, enabling effective cutting of high-order pressure wave components and prevention of satellite droplets without requiring the channel to extend further in the first direction.
2Reliability
If the channel length is increased to increase inertance, then satellite droplet prevention is improved, but the head becomes large-sized in the first direction
Solution Approach 1:
The patent resolves this contradiction by reorienting the first channel to extend in the second direction (parallel to the pressure chamber plane) rather than in the first direction. This allows the channel length to be increased to achieve sufficient inertance while keeping the head compact in the first direction, as the extended length now occurs in the perpendicular second direction.
3Reliability
If the channel cross-sectional area is reduced, then inertance is increased, but manufacturing precision requirements increase
Solution Approach 1:
The patent achieves the required inertance by increasing the channel length in the second direction rather than by excessively reducing the cross-sectional area. This parameter change strategy allows for more relaxed manufacturing precision requirements, as length dimensions are generally easier to control with standard manufacturing tolerances compared to small cross-sectional area dimensions.
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 achieves both the prevention of satellite droplets and reduction in head size by efficiently cutting high-order pressure waves, enabling high-frequency operation with reduced drive voltage and minimizing manufacturing complexities.
Implementation Method 1
providing a portion of which inertance is great in the connecting channel is effective in preventing the satellite droplet. The inertance is inversely proportional to the channel cross-sectional area and proportional to the channel length.
Implementation Method 2
The first channel of which inertance is great is capable of cutting a high-order component of the pressure wave and preventing the satellite droplet.
Data Source
AI summary
A liquid droplet ejecting head includes: a pressure chamber located along a plane, a nozzle which is open in a direction crossing the plane; a connecting channel connecting the pressure chamber and the nozzle, the connecting channel including a first channel extending parallel to the plane and a second channel extending in a first direction crossing the plane; wherein inertance of the first channel is greater than inertance of the second channel.