Liquid Discharging Head Thermal Management via Non-Overlapping Pressure Chambers
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Solution Overview
Problem
Existing liquid discharging heads experience temperature increases in individual channels due to heat concentration, leading to unstable ink discharge and viscosity variations, which affect printing quality.
Innovation Solution
The design includes a plurality of individual channels with non-overlapping pressure chambers and separate common channels that prevent heat transfer from high-temperature areas, maintaining the temperature of individual channels and ensuring stable ink discharge by arranging pressure chambers and common channels in specific orthogonal directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressure chambers are arranged in overlapping arrays to increase discharge density, then productivity is improved, but temperature increases due to heat concentration
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of pressure chambers to a three-dimensional stacked configuration. Multiple pressure chamber arrays are arranged in different layers along the vertical direction, with each layer containing pressure chambers that do not overlap with others. This spatial distribution in the third dimension allows high discharge density while preventing heat concentration that would occur in overlapping two-dimensional arrangements.
Solution Approach 2:
The pressure chamber arrays are segmented into multiple independent layers, where each layer operates as a separate thermal zone. The pressure chambers in different layers are positioned such that they do not overlap vertically, creating distinct thermal compartments. This segmentation prevents heat accumulation by distributing the heat-generating elements across multiple non-overlapping spatial zones.
2Temperature
If recirculating channel is positioned to cool individual channels, then temperature control is improved, but heat transfers to pressure chambers reducing effectiveness
Solution Approach 1:
The recirculating channel is extracted from the overlapping region and repositioned to a location where it does not intersect with pressure chambers. The channel carrying high-temperature liquid is routed through spaces between the stacked pressure chamber arrays, separating the thermal management function from the pressure generation zones. This extraction prevents unwanted heat transfer while maintaining the cooling function.
Solution Approach 2:
The patent introduces intermediate spacing and structural elements between the recirculating channel and pressure chambers. These intermediate regions act as thermal barriers, allowing the recirculating channel to pass through the head structure without direct thermal coupling to the pressure chambers. This mediator approach enables thermal management while preventing energy loss through unintended heat transfer.
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 temperature increases in individual channels, maintaining ink viscosity and ensuring stable and consistent ink discharge, thereby improving printing quality.
Implementation Method 1
the temperature of the liquid in the second common channel might be further higher than that of the liquid in each of the individual channels
Data Source
AI summary
A liquid discharging head is provided with: individual channels; a first common channel; and a second common channel. The individual channels include: first individual channels which have first pressure chambers and which are aligned in a second direction to form a first individual channel array, and second individual channels which have second pressure chambers and which are aligned in the second direction to form a second individual channel array; the first individual channel array and the second individual channel array are arranged in a third direction. The first common channel communicates with both of the first individual channels and the second individual channels; and the first pressure chambers and the second pressure chambers do not overlap with the second common channel in a first direction, and do not overlap with each other in the second direction.