Liquid Ejecting Head Manifold Layout for Pressure Vibration Attenuation
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Solution Overview
Problem
As the density of nozzles increases in a liquid ejecting head, the pressure vibration in the common channel becomes too great for the damper to absorb effectively, necessitating a solution to attenuate the pressure vibration.
Innovation Solution
A liquid ejecting head design with a common channel having a first and second supply port at opposite ends, and first and second paths with varying cross-sectional areas to control liquid flow, attenuating pressure waves through channel resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the density of nozzles is improved without changing the plane size of the head, then the nozzle disposition area is secured, but the pressure vibration in the manifold becomes too great to be absorbed by the damper
Solution Approach 1:
The common channel is divided into multiple segments with different cross-sectional areas. The first path has a smaller cross-sectional area than the second path and the central channel portion, creating multiple flow resistance zones that segment the pressure wave propagation and reduce overall pressure vibration.
Solution Approach 2:
Different portions of the common channel are given different cross-sectional areas to create localized flow resistance characteristics. The first path has reduced cross-sectional area specifically positioned to provide flow resistance where needed, while other portions maintain larger areas for adequate flow capacity.
2Manufacturing precision
If the width of the manifold is reduced to secure a nozzle disposition area, then the nozzle density is improved, but the amount of ink flowing from the manifold to individual channels increases causing greater pressure vibration
Solution Approach 1:
The cross-sectional area parameter of the common channel is varied along its length. The first path has a smaller cross-sectional area than the second path and central portion, creating different flow resistance parameters at different locations to control ink flow distribution and reduce pressure vibration.
3Object-generated harmful factors
If the cross-sectional area of the first path is made smaller than the second path and central channel, then pressure vibration is attenuated through increased channel resistance, but the flow path becomes more restricted
Solution Approach 1:
The common channel is segmented into different sections with varying cross-sectional areas. The first path section has reduced area for flow resistance, while the second path and central portions maintain larger areas to ensure adequate overall flow capacity, balancing resistance and flow requirements.
Solution Approach 2:
Flow resistance is localized to the first path section rather than uniformly applied throughout the entire common channel. This allows pressure vibration attenuation at specific locations while maintaining adequate flow capacity in other sections.
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 pressure vibration in the common channel is effectively attenuated, stabilizing the ejecting characteristic from the nozzles by controlling pressure waves through strategic channel resistance.
Implementation Method 1
A cross-sectional area orthogonal to the first direction of the first path in the common channel is smaller than a cross-sectional area orthogonal to the first direction of each of the second path in the common channel and a part, of the common channel, which is located between the first connecting part and the second connecting part
Data Source
AI summary
A head includes: a common channel and a plurality of individual channels. The common channel has: a first supply port, a second supply port, a first connecting part, a second connecting part, a first path disposed between the first supply port and the first connecting part, and a second path disposed between the second supply port and the second connecting part.A cross-sectional area orthogonal to a first direction of the first path in the common channel is smaller than a cross-sectional area orthogonal to the first direction of each of the second path in the common channel and a part, of the common channel, which is located between the first connecting part and the second connecting part.