Liquid Discharge Head Filter Segmentation for Bubble Clogging
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Solution Overview
Problem
Circulation-type liquid discharge heads face instability in liquid discharge due to air bubble clogging of filters, leading to pressure and flow rate fluctuations, which hinders the effective discharge of air bubbles and liquid.
Innovation Solution
A liquid discharge head design with a channel member and filter member configuration, where the inflow openings are covered with filters and outflow openings are not, and the area of the inflow openings is larger than the outflow openings, reducing flow resistance differences and preventing filter clogging by air bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filters are provided in supply and discharge openings to prevent foreign matter from entering the circulation-type head, then foreign matter entry is inhibited, but air bubbles are trapped by the filters and the filters are clogged with air bubbles
Solution Approach 1:
The patent divides the single filter into two separate filters: a first filter for the supply opening and a second filter for the discharge opening. This segmentation allows each filter to handle specific functions - the first filter prevents foreign matter entry while the second filter allows air bubble passage, thereby resolving the contradiction between preventing foreign matter and avoiding air bubble clogging
Solution Approach 2:
The patent applies different structural characteristics to different parts of the filter system. The first filter has a structure suitable for preventing foreign matter entry, while the second filter has a structure optimized for allowing air bubbles to pass through. This local differentiation in filter design enables each component to address specific problems without compromising the other function
2Object-affected harmful factors
If filters are provided in supply and discharge openings, then foreign matter entry is inhibited, but liquid circulation deteriorates due to filter clogging, making air bubble discharge difficult
Solution Approach 1:
By segmenting the filtration system into two separate filters at different locations (supply and discharge openings), the patent enables the discharge opening filter to be designed with characteristics that facilitate air bubble passage while maintaining foreign matter prevention, thus preserving liquid circulation efficiency
Solution Approach 2:
The second filter at the discharge opening acts as an intermediary that allows air bubbles to pass through while still providing filtration. This intermediary component mediates between the need for foreign matter prevention and the need for maintaining liquid circulation and air bubble discharge efficiency
3Object-affected harmful factors
If filters are provided in supply and discharge openings, then foreign matter entry is inhibited, but pressure fluctuation and flow rate fluctuation increase, making liquid discharge unstable
Solution Approach 1:
The patent segments the filtration function into two separate filters positioned at different locations in the liquid circulation path. This segmentation reduces the overall flow resistance compared to a single filter system, thereby minimizing pressure fluctuations and maintaining stable liquid discharge while still preventing foreign matter entry
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 configuration stabilizes the discharge of air bubbles and liquid by minimizing pressure and flow rate fluctuations, ensuring consistent ink flow from the nozzles.
Implementation Method 1
a filter member disposed on the back surface and having a filter that covers the first opening
Data Source
AI summary
A liquid discharge head includes: a channel member having a nozzle surface and a back surface disposed separately from the nozzle surface, the channel member formed having nozzles arranged in the nozzle surface, individual channels connected to the nozzles, first and second common channels connected to the individual channels, a first opening that is opened in the back surface and communicates with an end of the first common channel, and a second opening that is opened in the back surface and communicates with an end of the second common channel, and a filter member disposed on the back surface and having a filter that covers the first opening. The second opening is not covered with the filter, and an area of the first opening is larger than an area of the second opening.