Printhead Substrate Vent for Ink Container Pressure Equalization
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Solution Overview
Problem
Inkjet printers with foam-based ink containers may malfunction if the container vent is not properly sealed or functional, leading to improper printing due to insufficient air reaching the ink chamber, causing high vacuum and ink starvation in the printheads.
Innovation Solution
A new vent system is integrated into the printhead assembly, featuring an air hole in the substrate connected to the atmosphere through an air channel, allowing air to reach the ink container outlet even if the conventional vent on the container is malfunctioning, ensuring proper ink flow and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional vent on the ink container is used, then the ink container can be vented to the atmosphere, but the vent may malfunction if the user fails to remove the seal or if there is a defect in the vent
Solution Approach 1:
The patent introduces an intermediary venting path through the printhead assembly that acts as a backup when the conventional container vent fails. This secondary path includes a vent hole in the printhead substrate and a vent channel that connects to the ink container outlet, providing alternative access to the ink chamber for atmospheric pressure equalization.
Solution Approach 2:
The patent implements a redundant venting system that is pre-configured to compensate for potential venting failures. The printhead assembly is designed with built-in vent holes and vent channels that are ready to function immediately if the primary container vent fails, preventing vacuum conditions before they can cause ink starvation.
2Reliability
If the container vent is malfunctioning, then air cannot reach the ink chamber, but adding a backup vent increases device complexity
Solution Approach 1:
The printhead assembly is designed with multi-functionality, where the substrate serves both as a structural support and as a component containing vent holes. The vent channels are integrated into the existing printhead architecture, allowing the same structure to serve both ink delivery and pressure equalization functions simultaneously.
Solution Approach 2:
The patent merges the venting function into the existing printhead assembly structure by incorporating vent holes in the substrate and vent channels in the housing. This integration combines the ink delivery system and pressure equalization system into a unified design, avoiding the need for separate backup venting components.
3Reliability
If the container vent is not functional, then high vacuum occurs in the ink chamber, but the new vent system requires additional air channels and holes
Solution Approach 1:
The patent utilizes the third dimension by creating vertical vent channels that extend from the printhead substrate through the housing. The vent holes are positioned in the substrate and connect to vent channels that provide atmospheric access in a different spatial dimension, allowing pressure equalization without interfering with the horizontal ink flow paths.
Solution Approach 2:
The vent holes are strategically positioned in specific locations on the printhead substrate near the ink container outlet, and the vent channels are configured to provide localized pressure equalization exactly where needed. This targeted approach ensures that the backup venting system addresses the specific problem area without requiring complex system-wide modifications.
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 solution ensures continuous ink supply and maintains correct pressure within the ink container, preventing printing issues caused by non-functional container vents, thereby ensuring reliable operation of the printhead assembly.
Implementation Method 1
The air channel on the back side of the substrate connects the air hole to the atmosphere, thus venting the ink container to the atmosphere through the printhead assembly
Data Source
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AI summary
In one example, a structure for supporting a printhead includes: a substrate having a first side and a second side; an inlet tower through which liquid may be introduced into the structure; an opening through the substrate near the inlet tower; and an air channel along the substrate connecting the opening in the substrate to the atmosphere.