Liquid Ejection Head Damper Layout for Crosstalk Suppression
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Solution Overview
Problem
Existing liquid ejection heads suffer from crosstalk issues due to pressure fluctuations in pressure chambers, leading to unstable ejection speeds and volumes, which can adversely affect image quality, and previous dampers of uniform size fail to adequately suppress these fluctuations in all ejection elements.
Innovation Solution
The liquid ejection head incorporates a laminated structure with varying damper regions, where the damper regions for common flow channels communicating with different numbers of pressure chambers are sized differently to optimize damping effects, with larger damper regions for channels receiving pressure waves from multiple ejection element rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple dampers of the same size are prepared, then the structure is simplified and easy to manufacture, but sufficient effects to suppress crosstalk are not available in some ejection elements
Solution Approach 1:
The patent applies local quality by making each damper's size correspond to the specific number of pressure chambers it serves. Dampers are not uniform but are locally optimized: larger dampers for channels serving more pressure chambers, smaller dampers for channels serving fewer pressure chambers. This ensures each damper provides appropriate crosstalk suppression for its specific location in the liquid ejection head.
2Device complexity
If uniform dampers are used across all common flow channels, then device complexity is reduced, but ejection stability becomes insufficient for channels with different numbers of connected pressure chambers
Solution Approach 1:
The patent applies parameter changes by varying the size parameter of dampers based on the number of pressure chambers connected to each common flow channel. The damper size is adjusted as a variable parameter rather than being fixed, allowing optimization of ejection stability for each channel configuration while managing device complexity.
3Reliability
If larger dampers are used for all channels, then crosstalk suppression is improved, but the overall size of the ejection head increases
Solution Approach 1:
The patent applies local quality by positioning larger dampers only where needed - in common flow channels that communicate with a larger number of pressure chambers. Smaller dampers are used in channels serving fewer pressure chambers. This localized approach ensures adequate crosstalk suppression throughout the device while minimizing the overall volume of the ejection head.
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 effectively suppresses crosstalk, ensuring stable ejection operations while reducing the size of the ejection head, thereby improving image quality and operational stability.
Implementation Method 1
a first damper region for reducing a pressure fluctuation in the first common flow channel and a second damper region for reducing a pressure fluctuation in the second common flow channel
Data Source
AI summary
A liquid ejection head includes lamination in the enumerated order of an ejection port forming board including ejection ports that eject a liquid, a pressure chamber forming board including pressure chambers which are provided corresponding to the respective ejection ports and contain the liquid to be ejected from the ejection ports, a liquid supplying board including a first common flow channel communicating with a first number of the pressure chambers in common and a second common flow channel communicating with a second number, which is smaller than the first number, of the pressure chambers in common, and a damper region forming board including a first damper region for reducing a pressure fluctuation in the first common flow channel and a second damper region for reducing a pressure fluctuation in the second common flow channel. The first damper region is larger than the second damper region.