Liquid Discharging Head Flow Path Segmentation
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Solution Overview
Problem
In liquid jet heads with multiple individual flow paths and a common flow path, high potential resistance in the common flow path, especially when dealing with viscous liquids, leads to insufficient delivery to individual flow paths, and thickening the communication plate to reduce resistance increases the length of connecting flow paths, thereby slowing down image recording.
Innovation Solution
The design includes a configuration where the length of each flow path from the pressure chamber to the nozzle is maintained short by using a specific arrangement of plates with through holes forming connecting and common flow paths, without increasing the length, thereby reducing potential resistance in the common flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communication plate is thickened to reduce potential resistance in the common flow path, then liquid delivery is improved, but the length of connecting flow paths increases which slows down pressure wave propagation and reduces recording speed
Solution Approach 1:
The communication plate is divided into multiple thinner plates (first communication plate, second communication plate, third communication plate) stacked together. This segmentation allows the common flow path to span across multiple plates, effectively reducing the potential resistance without increasing the length of individual connecting flow paths within each plate, thus maintaining pressure wave propagation speed while improving liquid delivery.
Solution Approach 2:
The solution transitions from a single-thickness dimension to a multi-layer stacked dimension. By arranging multiple communication plates in the thickness direction (z-axis), the common flow path is extended across layers rather than within a single plate, reducing resistance without increasing the in-plane length of connecting flow paths, thereby preserving recording speed.
2Reliability
If the communication plate is thickened to reduce potential resistance in the common flow path, then liquid delivery is improved, but the structure becomes more complex
Solution Approach 1:
Multiple communication plates are merged together in a stacked configuration to form the common flow path. This merging approach distributes the resistance-reduction function across multiple identical or similar components, simplifying manufacturing and assembly while achieving the desired reduction in potential resistance without significantly increasing overall structural complexity.
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 allows for efficient ink delivery to individual flow paths while maintaining short pressure wave propagation cycles, thus enhancing recording speed without increasing the length of flow paths.
Implementation Method 1
a propagation cycle of pressure waves of the liquid to be transmitted from the pressure chambers to the nozzles
Data Source
AI summary
A liquid discharging head, having a plurality of individual flow paths, a common flow path, a first member, and a second member, is provided. Each of the individual flow paths includes a nozzle, a pressure chamber, and a connecting flow path arranged between the nozzle and the pressure chamber. The connecting flow path connects the nozzle with the pressure chamber. In the first member, a plurality of first holes each constituting the connecting flow path and a second hole constituting the common flow path are formed. The second member is arranged at a side of the connecting flow path opposite to the pressure chamber in an aligning direction, in which the nozzle, the connecting flow path, and the pressure chamber align with one another. The second member has a third hole that constitutes the common flow path but does not constitute the connecting flow path.