Ink Manifold Grid Design for Printhead Flow
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Solution Overview
Problem
The complexity and cost of manufacturing page wide inkjet printheads, particularly the ink delivery manifold, are exacerbated by the need for precise semiconductor materials and small feature sizes, which can compromise ink flow rates and efficiency.
Innovation Solution
The design involves scaling down heater chips and ink manifolds with optimized features, including one ink channel per color and multiple ink ports, arranged in a grid with diagonal alignment to maintain seal breadth and maximize ink carrying capacity, allowing for efficient ink delivery without compromising volume flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the heater chips and ink manifolds are scaled down in size to reduce manufacturing cost, then the manufacturing cost decreases, but the ink flow rate and delivery performance are compromised
Solution Approach 1:
The ink manifold is segmented into multiple sections, each with its own ink channel and ports. This segmentation allows the manifold to be divided into manageable units that can be optimized for both size and ink flow capacity, resolving the contradiction between scaled-down dimensions and adequate ink delivery performance
Solution Approach 2:
The patent applies hydraulic principles by designing ink channels with optimized cross-sectional areas and configurations. The channel geometry is specifically engineered to maintain adequate ink flow rates despite the overall reduced size of the manifold, using fluid dynamics considerations to compensate for dimensional scaling
2Ease of manufacture
If the feature sizes are reduced in the ink manifold, then the manufacturing precision requirements increase, but the manufacturing cost decreases
Solution Approach 1:
The patent changes key geometric parameters of the ink manifold features, such as channel cross-sectional area, port dimensions, and wall thickness ratios. These parameter optimizations allow smaller features to be manufactured with standard tolerances while maintaining functional performance, thus reducing the need for ultra-precise manufacturing
3Quantity of substance
If multiple ink ports are added to each ink channel section, then the ink carrying capacity increases, but the device complexity increases
Solution Approach 1:
The ink manifold sections are designed with universal, repeating patterns of ports and channels that serve multiple functions. Each section can handle multiple ink colors and serves both as a delivery conduit and a distribution point, reducing overall system complexity through functional integration
Solution Approach 2:
The manifold structure employs a nested arrangement where multiple ports are integrated into each channel section in a compact, hierarchical configuration. This nesting allows high ink carrying capacity within a limited volume without proportionally increasing 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 approach reduces manufacturing costs and improves the assembly efficiency of printhead components while maintaining or enhancing ink delivery performance, even with smaller feature sizes.
Implementation Method 1
Each heater chamber includes a heater (often a resistor) for each nozzle that is addressable by the print controller to heat the ink in the respective chamber and nucleate the same
Implementation Method 2
The manifold typically includes ink ports on the top surface to mate to the ink supply, and elongate ink channels of the bottom surface to mate with the backside ink trenches of the underlying heater chip
Data Source
AI summary
An ink manifold for supplying liquid ink to a heater chip of an inkjet printhead. Ink ports on one side of the manifold feed liquid ink to the ink channels on the other side of the manifold, and thus to the backside ink trenches of the heater chip. The placement and number of ink ports formed in the ink manifold are optimized so that when the heater chip and the ink manifold are scaled down in size, the ink carrying capacity of the printhead components is not compromised. Similarly, when the ink manifold is scaled down, the optimization process allows the seal width between the ink port features of the manifold to be maintained above a specified minimum.