Liquid Discharge Head Return Manifold Crosstalk Suppression
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Solution Overview
Problem
Conventional liquid discharge heads experience instability due to significant crosstalk influence through the return manifold, which is not effectively suppressed by existing damper parts or return throttles.
Innovation Solution
A liquid discharge head design featuring a supply manifold, a return manifold with increased compliance, and individual flow channels with return throttles, where the return manifold is positioned between the nozzle surface and the supply manifold, and has a return damper part to mitigate crosstalk effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the return manifold is used to circulate liquid from nozzles, then liquid circulation is achieved, but crosstalk influence increases causing discharge instability
Solution Approach 1:
A damper part is introduced as an intermediary element between the return manifold and the nozzles. This damper part acts as a mediator that absorbs and dissipates pressure fluctuations and crosstalk signals, preventing them from reaching the nozzles and causing discharge instability. The damper part effectively decouples the harmful crosstalk propagation while maintaining the liquid circulation function.
Solution Approach 2:
The physical parameters of the return flow path are modified by introducing the damper part, which changes the flow characteristics, pressure distribution, and compliance of the return manifold system. These parameter changes reduce the transmission of crosstalk signals while preserving the essential liquid circulation function from nozzles back to the supply.
2Volume of moving object
If the flow channel from nozzles to return manifold is shortened, then device size is reduced, but crosstalk influence increases
Solution Approach 1:
The damper part serves as an intermediary that compensates for the shortened flow channel length. By placing the damper part in the return path, it provides the necessary flow resistance and compliance to suppress crosstalk, allowing the overall head size to be reduced without sacrificing crosstalk mitigation capability.
Solution Approach 2:
The damper part introduces specific flow resistance and compliance parameters that compensate for the reduced path length. These parameter changes ensure that even with a shorter return channel, the crosstalk suppression performance is maintained through optimized flow characteristics rather than relying solely on path length.
3Object-generated harmful factors
If damper parts are provided for each manifold, then crosstalk influence is moderated, but device complexity increases
Solution Approach 1:
The return manifold is segmented into multiple flow paths, each equipped with its own damper part. This segmentation allows independent control and optimization of crosstalk suppression for each nozzle group, while the modular structure makes the complexity manageable through standardized repeating units.
Solution Approach 2:
Instead of providing damper parts for both supply and return manifolds uniformly, the invention applies damper parts specifically to the return manifold where crosstalk suppression is most critical. This local quality approach optimizes crosstalk mitigation while minimizing the overall device complexity by targeting only the necessary locations.
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 effectively suppresses the instability of liquid discharges by reducing crosstalk influence through the return manifold, enhancing the overall stability of the discharge process.
Implementation Method 1
The return manifold has a compliance larger than a compliance of the supply manifold
Data Source
AI summary
A liquid discharge head includes: nozzles aligned on a nozzle surface; a supply manifold configured that a liquid is supplied therein from the outside of the liquid discharge head; a return manifold which is arranged between the nozzle surface and the supply manifold in a first direction, which is configured that the liquid is flown out therefrom to the outside of the liquid discharge head, and which is provided with a return damper part; and individual flow channels each of which corresponds to one of the nozzles. Each of the individual flow channels has a return throttle channel communicating the corresponding nozzle with the return manifold and being arranged between the return manifold and the nozzle surface in the first direction. The return manifold has a compliance larger than a compliance of the supply manifold.