Inkjet Cap Atmosphere Communication Portion Stabilizes Meniscus
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Solution Overview
Problem
Inkjet recording devices face instability in ink droplet ejection due to meniscus breakage at the nozzle tip, leading to potential clogging and overflow issues when caps are used to seal the ink outlet, as the internal pressure can disrupt the ink meniscus.
Innovation Solution
A cap design with an atmosphere communication portion, including a ventilation hole, sub-space, and ventilation channel, allows the main space between the cap and nozzle head to communicate with the atmosphere, preventing ink overflow and meniscus breakage by retaining ink in the sub-space and guiding it away from the ventilation channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the ink outlet is hermetically sealed by the cap, then ink retention is improved, but ink overflow and meniscus breakage occur due to pressure buildup
Solution Approach 1:
The atmosphere communication portion is segmented into multiple functional components: a ventilation hole for air intake, a sub-space for ink retention, and a ventilation channel for controlled communication. This segmentation allows each component to perform its specific function while working together to resolve the contradiction between ink retention and meniscus stability.
Solution Approach 2:
The sub-space acts as an intermediary chamber between the main space and the ventilation channel. It retains ink that enters through the ventilation hole, preventing direct contact between ink and the ventilation channel, thereby maintaining meniscus stability while allowing pressure equalization.
2Reliability
If the cap body is pressed against the nozzle head to form a sealed main space, then clogging prevention is improved, but pressure causes meniscus breakage and unstable ejection
Solution Approach 1:
Different regions of the cap have different properties: the cap body provides sealing contact with the nozzle head, the ventilation hole provides atmospheric communication, the sub-space provides ink retention, and the ventilation channel provides controlled ventilation. This local differentiation of properties allows the cap to simultaneously achieve clogging prevention and ejection stability.
3Reliability
If a simple ventilation hole is provided in the cap, then pressure equalization is improved, but ink enters the ventilation hole and causes clogging
Solution Approach 1:
The sub-space serves as an intermediary barrier between the ventilation hole and the ventilation channel. It captures ink that enters through the ventilation hole and retains it within the sub-space, preventing ink from reaching and clogging the ventilation channel while maintaining pressure equalization functionality.
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 stabilizes ink ejection, reduces clogging, and extends the cap's usage period without replacement, lowering manufacturing and operational costs by effectively managing ink flow and pressure.
Implementation Method 1
The atmosphere communication portion allows the main space to be in communication with the atmosphere
Implementation Method 2
The sub-space retains ink entering the ventilation hole
Implementation Method 3
The cap body comes into contact with and is pressed against a portion around the ink outlet of the nozzle head
Data Source
AI summary
A cap includes a cap body and an atmosphere communication portion. The cap body comes into contact with and is pressed against a portion around an ink outlet of a nozzle head to form a main space between the cap body and the nozzle head. The atmosphere communication portion includes a ventilation hole, a sub-space, and a ventilation channel. The ventilation hole is open to the main space. The sub-space retains ink entering the ventilation hole. The ventilation channel allows the sub-space to be in communication with the atmosphere.