Liquid Discharging Head Vertical Channel Stacking
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Solution Overview
Problem
In liquid jetting heads, long recovery channels lead to high resistance, hindering air exhaust and potentially causing crosstalk due to pressure chamber pressure changes, while short channels compromise nozzle plate thickness and increase crosstalk risk.
Innovation Solution
A liquid discharging head design featuring a first and second common channel, individual channels, and descenders connecting nozzles to pressure chambers, with connecting channels having a shorter second channel part to reduce resistance and prevent crosstalk, allowing smooth air exhaust and ink flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the length of recovery channels is made long to reduce channel resistance, then air exhaust becomes smooth, but the partition wall must be thinned which causes crosstalk between adjacent channels
Solution Approach 1:
The patent introduces a new spatial dimension by adding a second common channel positioned above the first common channel in the thickness direction of the nozzle plate. This vertical stacking arrangement allows the connecting channels to extend in the thickness direction, effectively increasing the available path length for air exhaust without requiring the partition walls to be thinner, thus avoiding crosstalk while maintaining low resistance
2Object-affected harmful factors
If the length of recovery channels is made short to prevent crosstalk, then partition wall thickness is maintained, but channel resistance increases and air exhaust becomes inefficient
Solution Approach 1:
The patent utilizes the thickness direction of the nozzle plate as an additional dimension for channel routing. By forming the first and second common channels at different heights in the thickness direction and allowing connecting channels to extend vertically between them, the system achieves longer effective channel lengths without compromising partition wall thickness, thereby maintaining both crosstalk prevention and air exhaust efficiency
3Reliability
If the cross-sectional area of recovery channels is increased to reduce resistance, then air exhaust improves, but the small thickness of the nozzle plate and side-by-side arrangement make this difficult to achieve
Solution Approach 1:
The patent transitions from a planar arrangement to a three-dimensional stacked configuration. By forming common channels that extend in the thickness direction and positioning them at different heights, the system creates larger effective cross-sectional areas for fluid flow without requiring increased lateral dimensions, thus overcoming the constraints imposed by the thin nozzle plate geometry
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 design minimizes crosstalk and ensures efficient air exhaust while maintaining a suitable channel resistance, ensuring reliable ink discharge without leakage or fluid interference between pressure chambers.
Implementation Method 1
a piezoelectric actuator having a piezoelectric layer formed on an inner surface, of an upper surface, of the vibration plate opposing the pressure chamber
Data Source
AI summary
A liquid discharging head includes: a first common channel, a second common channel; and individual channels. The individual channels have: nozzles aligned in a first direction; pressure chambers; descenders formed in a channel substrate arranged between a nozzle plate and a pressure chamber plate in a second direction orthogonal to the first direction; and a connecting channel. The connecting channel has: a first channel part formed in the nozzle plate, and a second channel part formed in the channel substrate, connected to the first channel part and having a length in the second direction which is shorter than that of the second common channel. The second common channel is formed in the channel substrate, overlaps with the descenders in a third direction orthogonal to both of the first direction and the second direction, and is partitioned from the descenders by a partition wall formed by the channel substrate.