Liquid Ejecting Head Film Adhesive Hole Uniformity
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Solution Overview
Problem
Ink jet printing heads face irregular passage resistance due to deformation of film adhesives during the manufacturing process, leading to variations in ink ejection volume and speed across nozzle orifices.
Innovation Solution
The use of film adhesives with round holes of equal size, specifically designed to match the openings in the supply port and reservoir plates, reduces irregularity in the adhesive layer's capacity, thereby minimizing passage resistance and ensuring consistent ink ejection across all nozzle orifices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If heat and pressure are applied irregularly during the adhering operation, then the adhering process can be completed, but the deformation degree of holes in the film adhesive becomes different in every hole, causing irregular passage resistance and varying ink ejection performance
Solution Approach 1:
The patent applies preliminary action by pre-forming holes in the film adhesive with predetermined dimensions and positions before the adhering operation. This ensures that even when heat and pressure are applied during bonding, the holes maintain uniform deformation characteristics, preventing irregular passage resistance and ensuring consistent ink ejection across all nozzles.
2Ease of manufacture
If the film adhesive layer has thickness with deformed holes, then the adhering operation can be performed, but the capacity of space formed by holes becomes irregular, causing different passage resistance in every nozzle orifice
Solution Approach 1:
The patent applies parameter changes by carefully controlling the dimensions, positions, and shapes of holes in the film adhesive. By optimizing these parameters before adhering, the holes maintain uniform characteristics even after deformation during bonding, ensuring consistent passage resistance and reliable ink ejection performance across all nozzles.
3Ease of operation
If holes are formed in the film adhesive to match openings, then the nozzle communication ports remain unblocked, but the holes deform during heat and pressure application, causing irregular ink ejection volume and speed
Solution Approach 1:
The patent applies preliminary action by pre-forming holes in the film adhesive with predetermined dimensions and positions before the adhering operation. This ensures that even when heat and pressure are applied during bonding, the holes maintain uniform deformation characteristics, preventing irregular passage resistance and ensuring consistent ink ejection across all nozzles.
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 results in a liquid ejecting head with reduced irregularity in ink ejection volume and speed, enhancing the reliability and performance of ink jet printing by maintaining uniform passage resistance across all nozzle communication ports.
Implementation Method 1
The shape of the holes formed in the film adhesive is deformed due to the applied heat and pressure
Implementation Method 2
The shape of the holes formed in the film adhesive is deformed due to the applied heat and pressure
Implementation Method 3
heat-compressing one surface of a supply port plate and a first film adhesive
Implementation Method 4
heat-compressing one surface of a supply port plate and a first film adhesive
Data Source
AI summary
A first film adhesive between actuator units and a supply port plate, a second film adhesive between a reservoir plate and the supply port plate, and a third film adhesive between the reservoir plate and a nozzle plate are each provided with round holes having an equal size and formed in correspondence to the locations of nozzle communication ports. Thanks to the round holes having the equal size one another, irregularity in capacities of spaces formed by layers of the first film adhesive, the second adhesive, and the third film adhesive are reduced, thereby reducing a difference of passage resistance caused in the nozzle communication ports. Accordingly, it is possible to realize a printing head capable of reducing irregularity in an amount of ejected ink and a speed of ink drops between nozzles.