Filter Sheet Adhesive Accumulation Area for Inkjet Heads
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Solution Overview
Problem
In liquid droplet ejection heads, the reduction in size leads to adhesive extrusion sealing fine pores, causing increased liquid resistance and bubble trapping, which hampers efficient ink ejection, and existing solutions increase costs or size due to complex shapes and additional processes.
Innovation Solution
A filter member design with a filter sheet and frame body where the fine pore area is larger than the frame opening, and an adhesive accumulation area is formed to contain protruded adhesive, preventing pore sealing and allowing bubble discharge, achieved through a simpler manufacturing process without increasing the device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the device size is reduced, then miniaturization is achieved, but adhesive extrusion seals fine pores causing increased liquid resistance
Solution Approach 1:
The filter member is segmented into distinct functional zones: a pore formation area with fine pores for filtration, and an adhesive accumulation area with larger pores or voids specifically designed to receive and contain extruded adhesive. This segmentation prevents adhesive from blocking the fine pores while maintaining the benefits of miniaturization.
Solution Approach 2:
Different regions of the filter member have different pore characteristics tailored to their specific functions. The pore formation area maintains fine pores for effective liquid filtration, while the adhesive accumulation area has larger pores that prevent adhesive sealing. This local differentiation of quality allows the filter to handle both filtration and adhesive containment effectively in a compact design.
2Ease of manufacture
If adhesive is used to connect filter sheet and frame, then assembly is simplified, but adhesive protrusion seals fine pores
Solution Approach 1:
The adhesive accumulation area acts as an intermediary zone between the filter sheet and frame body, specifically designed to receive and contain the adhesive that naturally protrudes during assembly. This intermediary structure prevents the adhesive from reaching and sealing the fine pores in the pore formation area, while still allowing the adhesive to perform its bonding function.
Solution Approach 2:
Instead of trying to prevent adhesive protrusion (which would require complex additional processes), the invention converts the harmful effect of adhesive extrusion into a beneficial feature by designing the adhesive accumulation area to deliberately receive and contain the protruding adhesive. This transforms the manufacturing challenge into a design feature that simplifies the overall process.
3Reliability
If complex shapes and additional processes are used to prevent pore sealing, then adhesive sealing is avoided, but costs and device size increase
Solution Approach 1:
The adhesive accumulation area is integrated into the filter member structure itself, merging the adhesive containment function with the filtration function in a single component. This eliminates the need for separate adhesive barriers or complex additional manufacturing processes, maintaining simplicity while preventing pore sealing.
Solution Approach 2:
The filter member is pre-designed with the adhesive accumulation area and differentiated pore structures before assembly occurs. This preliminary design ensures that when adhesive is applied during assembly, it naturally accumulates in the designated area without requiring additional control measures or complex processes during the assembly operation itself.
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 ensures stable liquid droplet ejection without increasing part costs or size, by preventing adhesive sealing of fine pores and effectively discharging bubbles, thus maintaining efficient ink supply to nozzles.
Implementation Method 1
a filter sheet member disposed in a liquid flow path to supply liquid from the common liquid chamber to the plural individual liquid chambers and including plural pores formed therein to filter the liquid
Implementation Method 2
a frame body including an opening part and being in connection with the filter sheet member with adhesive applied therebetween
Data Source
AI summary
A liquid droplet ejection head includes plural nozzles; plural individual liquid chambers; a common liquid chamber supplying liquid to the plural individual liquid chambers; a filter sheet member including plural pores formed therein to filter the liquid; and a frame body including an opening part and being in connection with the filter sheet member with adhesive. Further, a size of a region where the plural pores are formed is greater than the opening part of the frame body; an adhesive accumulation area is formed on an inner peripheral end of the opening part; and a size of the adhesive accumulation area in a protruding direction of the adhesive is greater than a size of an area between adjacent pores in the filter sheet member.