Fluid Path Unit With Cross-Path Reservoir Connections
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Solution Overview
Problem
In high-density nozzle arrangements for fluid ejection devices like inkjet heads, the reduced width of the common fluid reservoir compromises damping performance due to the elongated shape of the reservoir, leading to crosstalk issues as pressure waves propagate across adjacent pressure chambers.
Innovation Solution
The fluid path unit design includes first and second pressure chamber rows with specific outlet and connection paths that allow for a sufficiently wide common fluid reservoir, enhancing damping performance by ensuring the reservoir's width and layout flexibility, and using cross-paths and noncross-paths to connect pressure chambers to the reservoir effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the common fluid reservoir is elongated to overlap with a row of pressure chambers, then the layout efficiency is improved, but the width of the common fluid reservoir is reduced, deteriorating damping performance
Solution Approach 1:
The connection paths extend in the array direction (first direction) rather than only in the scanning direction (second direction), utilizing the third dimension of spatial arrangement. This allows the common fluid reservoir to maintain sufficient width in the scanning direction while still providing effective connection to all pressure chambers through the extended connection paths that traverse across outlet path rows.
2Area of moving object
If nozzles are arranged at higher density in multiple rows, then the head size is reduced and image resolution is improved, but the width of the common fluid reservoir is further reduced, worsening damping effect
Solution Approach 1:
The connection paths are segmented to extend across different outlet path rows independently. Each connection path can be optimized to connect to specific pressure chambers while traversing through the common fluid reservoir, allowing the reservoir to maintain width for damping while supporting high-density multi-row nozzle arrangements.
Solution Approach 2:
By extending connection paths in the array direction across outlet path rows, the design utilizes the third spatial dimension to resolve the conflict between compact head size and sufficient reservoir width for damping performance.
3Area of stationary object
If the common fluid reservoir width is reduced, then more space is available for high-density nozzle arrangement, but the damping performance for pressure waves is deteriorated
Solution Approach 1:
The connection paths serve as intermediary structures that extend across outlet path rows, allowing the common fluid reservoir to maintain its width for effective damping while still providing fluid communication to all pressure chambers. The connection paths mediate between the spatial constraints and the damping requirements.
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 dampens pressure waves, reduces crosstalk, and maintains structural balance and ejection characteristics even at high nozzle densities, ensuring superior damping performance and layout flexibility.
Implementation Method 1
a damper wall for absorbing the receding component of the pressure wave is provided to face the common fluid reservoir
Data Source
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AI summary
A fluid path unit (2) for a fluid ejection device, includes: first pressure chambers (23A) arrayed in a first pressure chamber row; second pressure chambers (23B) arrayed in a second pressure chamber row adjacent to the first pressure chamber row; first outlet paths (24A), through which the first pressure chambers respectively communicate with first nozzles (25A), the first outlet paths arrayed in a first outlet path row; second outlet paths (24B), through which the second pressure chambers respectively communicate with second nozzles (25B), the second outlet paths arrayed in a second outlet path row; a common fluid reservoir (21); and first connection paths, though which the first pressure chambers communicate with the common fluid reservoir. Each of the first connection paths extends across the second outlet path row.