Liquid Discharge Head Common Chamber Vibration Attenuation
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Solution Overview
Problem
Existing liquid discharge heads face issues with pressure vibration propagation between individual liquid chambers and increased fluid resistance in the common liquid chamber, leading to unsatisfactory liquid discharge performance.
Innovation Solution
The liquid discharge head incorporates a vibration attenuator with a through hole disposed close to the individual liquid chambers in the common liquid chamber, which attenuates pressure vibrations and prevents fluid resistance from increasing, ensuring stable liquid discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration attenuator is added to the common liquid chamber, then pressure vibration propagation is reduced, but fluid resistance increases
Solution Approach 1:
The vibration attenuator is designed with a porous structure that allows liquid to pass through while providing vibration damping. The porous configuration enables the attenuator to reduce pressure vibrations without creating a complete blockage, thus maintaining fluid flow and reducing overall fluid resistance compared to solid barriers.
Solution Approach 2:
The vibration attenuator incorporates a thin film structure that can deform to absorb pressure vibrations. This flexible thin film allows the attenuator to respond to pressure changes and dampen vibrations while maintaining open flow paths, balancing vibration attenuation with fluid resistance management.
2Reliability
If the vibration attenuator is positioned close to individual liquid chambers, then pressure vibration propagation is prevented, but the common liquid chamber volume is reduced
Solution Approach 1:
The common liquid chamber is segmented into multiple regions by positioning vibration attenuators at different locations. This segmentation allows the chamber to be divided into functional zones where vibration attenuation occurs without requiring a complete reduction of overall chamber volume, as each segment can independently manage local pressure vibrations.
Solution Approach 2:
The vibration attenuators are positioned in the liquid discharge direction (depth dimension) rather than solely in the horizontal plane. This vertical positioning allows the attenuators to be close to individual liquid chambers for effective vibration prevention while minimizing the horizontal space occupation and maintaining adequate common liquid chamber 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
The solution effectively reduces pressure vibration propagation and maintains low fluid resistance, enabling satisfactory liquid discharge without supply shortages or variations.
Implementation Method 1
a vibration attenuator provided, in the common liquid chamber, at a predetermined position between one end and the other end of the common liquid chamber in a liquid discharge direction of the liquid discharge head
Implementation Method 2
multiple dampers with varying thicknesses and an air layer for deformability, ensuring effective attenuation of pressure vibrations
Data Source
AI summary
A liquid discharge head includes a nozzle plate, a channel substrate, a frame, and a vibration attenuator. The nozzle plate has multiple nozzles from which a liquid is discharged in a liquid discharge direction. The channel substrate has multiple individual liquid chambers communicating with the multiple nozzles, respectively. The frame has a first end adjacent to the channel substrate, a second end opposite the first end in the liquid discharge direction, and a common liquid chamber between the first end and the second end and communicating with the multiple individual liquid chambers. The vibration attenuator is disposed between the first end and the second end in the common liquid chamber. The vibration attenuator has a through hole through which the liquid flows in the common liquid chamber.