Liquid Ejecting Head Orifice Density via Circulation Path
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Solution Overview
Problem
The existing liquid ejecting heads with fluid pumps between jetting elements face challenges in reducing the interval between jetting elements and increasing the density of ejection orifices, as the fluid pump interferes with the arrangement of energy generating elements.
Innovation Solution
A liquid ejecting head design featuring a supply path with a branching circulation flow path that includes energy generating and liquid feed elements, where the liquid feed element is positioned between the energy generating element and the supply path, allowing for increased density of ejection orifices without the fluid pump obstructing the energy generating elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a fluid pump is provided between jetting elements to circulate liquid, then liquid circulation is achieved, but the interval between jetting elements cannot be reduced and ejection orifice density cannot be increased
Solution Approach 1:
The liquid feed element (fluid pump) is extracted from its traditional position between jetting elements and relocated to the circulation flow path. This allows the energy generating elements to be arranged closely together without the pump obstructing their placement, thereby increasing ejection orifice density while maintaining liquid circulation functionality.
Solution Approach 2:
The liquid feed element is positioned at a different distance from the supply path compared to the energy generating elements. This spatial reorganization in the vertical dimension (distance from supply path) allows horizontal densification of ejection orifices without compromising liquid circulation.
2Quantity of substance
If jetting elements are arranged closely together to increase density, then ejection orifice density increases, but liquid circulation becomes difficult to maintain
Solution Approach 1:
The liquid circulation system is segmented into distinct functional zones: the supply path, the circulation flow path with liquid feed element, and the pressure chamber with energy generating elements. This segmentation allows each component to perform its function optimally without interference, maintaining reliable liquid circulation even with high-density jetting element arrangement.
3Quantity of substance
If the interval between jetting elements is reduced to increase density, then ejection orifice density increases, but the fluid pump interferes with the arrangement of energy generating elements
Solution Approach 1:
The fluid pump is extracted from the space between jetting elements and relocated to the circulation flow path. This removes the obstruction that previously prevented close spacing of energy generating elements, enabling both high ejection orifice density and ease of manufacturing through straightforward linear arrangement of components.
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 design enables a higher density of ejection orifices while maintaining effective liquid circulation, suppressing viscosity increases and removing foreign substances, achieving up to 1200 dpi by optimizing the arrangement of energy generating and liquid feed elements.
Implementation Method 1
an energy generating element (6) that is provided facing the ejection orifice (4) and generates energy for ejecting the liquid
Implementation Method 2
a liquid feed element (7) that generates energy to circulate the liquid
Data Source
AI summary
A liquid ejecting head which has a supply path that is used to supply a liquid and a circulation flow path that branches from the supply path and is joined to the supply path again, and communicates with an ejection orifice for ejecting the liquid. The circulation flow path has an energy generating element that is provided facing the ejection orifice and generates energy for ejecting the liquid, and a liquid feed element that is used to circulate the liquid. The energy generating element and the liquid feed element are located at different distances from the supply path, and the circulation flow path has a pressure chamber provided with the energy generating element at a position farthest from the supply path.