Liquid Droplet Ejecting Head Flexible Wall Damping
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Solution Overview
Problem
Existing liquid droplet ejecting heads face challenges in achieving high definition images due to mutual interference caused by pressure variations between dedicated and common liquid chambers, leading to destabilization of droplet ejection and limited damping effects, which are exacerbated by large layouts, increased costs, and potential moisture-related failures.
Innovation Solution
A liquid droplet ejecting head with a flexible wall in the common liquid chamber and a buffer chamber connected to an external space, utilizing a damper film for improved damping and reduced size and cost, while maintaining effective pressure variation attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate damper chamber is provided where the manifold continues from the opening, then the pressure variation can be absorbed, but the layout is enlarged and the common ink chamber volume cannot be increased
Solution Approach 1:
The patent merges the common liquid chamber and damper chamber into a single integrated structure. The partition wall divides the common liquid chamber into a first region (communicating with dedicated liquid chambers) and a second region (acting as damper), eliminating the need for a separate damper chamber and manifold continuation, thus reducing layout area while maintaining damping functionality
Solution Approach 2:
The common liquid chamber serves dual functions: it acts as a common liquid supply chamber for multiple nozzles and simultaneously functions as a damper chamber through its second region. This multi-functionality eliminates the need for separate dedicated damper structures, reducing overall layout complexity
2Reliability
If the common liquid chamber volume is increased to improve damping, then the damping effect is enhanced, but the number of substrates increases and manufacturing complexity rises
Solution Approach 1:
The patent combines the common liquid chamber and damper chamber into a single substrate structure, divided by a partition wall. This integration allows the damper function to be achieved within the existing substrate framework without requiring additional substrates, thus enhancing damping while controlling manufacturing complexity
Solution Approach 2:
The common liquid chamber is segmented into two regions by a partition wall: a first region for liquid supply and a second region for damping. This segmentation allows the damper function to be implemented within the existing substrate without increasing substrate count, as the partition wall creates functional zones within a single substrate
3Productivity
If multiple dedicated liquid chambers are placed closer together for higher density, then printing speed and definition improve, but mutual interference between chambers increases
Solution Approach 1:
The partition wall acts as an intermediary structure between dedicated liquid chambers and the damper region. It allows pressure variations from energizing dedicated chambers to be absorbed by the damper region (second region of common liquid chamber), preventing mutual interference between adjacent nozzles while maintaining high density arrangement
Solution Approach 2:
The damper region (second region of common liquid chamber) is positioned to receive and absorb pressure variations before they can propagate to adjacent dedicated liquid chambers. This beforehand cushioning effect prevents mutual interference and stabilizes droplet ejection even when chambers are closely spaced for high-density printing
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 provides superior damping to prevent mutual interference, enabling higher definition image output at increased printing speeds while maintaining a compact design and reducing costs, thus enhancing the reliability of ink droplet ejection and image quality.
Implementation Method 1
at least one wall face of the common liquid chamber is made up of a flexible wall (4), which has flexibility
Implementation Method 2
a buffer chamber (31) is provided in a region which opposes the common liquid chamber (51) via the flexible wall (4), and the buffer chamber (31) is communicatively connected to an external space (61)
Data Source
AI summary
A liquid droplet ejecting head is disclosed which includes at least one or more nozzles which eject liquid droplets; one or more dedicated liquid chambers which are communicatively connected to the nozzle; a common liquid chamber which is communicatively connected to the dedicated liquid chamber; and an energy generating unit which generates energy provided to the dedicated liquid chamber, wherein at least one wall face of the common liquid chamber includes a flexible wall, which has flexibility; a buffer chamber is included in an opposing area via the flexible wall and the common liquid chamber; and wherein the buffer chamber is communicatively connected to an external space in an area not opposing the common liquid chamber.