Liquid Ejecting Head Flat Plate Distortion Suppression
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Solution Overview
Problem
During the manufacturing of liquid ejecting heads, press processing can cause distortion and warpage in metal flat plates, leading to a decrease in flatness and precision, which affects the performance and durability of the ejecting heads.
Innovation Solution
A manufacturing method that includes forming a stepped region with a protrusion on the liquid ejection side of the flat plate, where the protrusion is created within a stepped region formed by half-blanking, to suppress distortion and ensure flatness, and fixing a flow path member on the opposite side to enhance the structural integrity and prevent medium contact with the ejection surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If press processing is performed on a thin metal flat plate to form holes or protrusions, then the desired structural features are created, but distortion and warpage occur on the surface reducing flatness
Solution Approach 1:
A support structure is provided on the liquid ejection side of the flat plate before press processing occurs. This support structure prevents the plate from warping during the pressing operation, maintaining flatness while allowing holes and protrusions to be formed. The support structure acts as a preliminary measure to counteract the distorting forces that will be applied during manufacturing.
Solution Approach 2:
The support structure functions as a counterbalancing element that opposes the warping forces generated during press processing. By providing structural support on the liquid ejection side, it counteracts the material flow and distortion that occurs when punches press into the plate from the opposite side, thereby maintaining the required flatness.
2Volume of moving object
If the flat plate is made thinner to reduce overall head size, then compactness is improved, but distortion and warpage become more pronounced during press processing
Solution Approach 1:
The support structure is installed before press processing to prevent warpage in thin plates. This preliminary support allows the use of thinner plates for compactness while ensuring that the pressing operations required to create holes and protrusions do not cause excessive distortion or loss of flatness.
Solution Approach 2:
The support structure provides localized reinforcement on the liquid ejection side of the flat plate. This local quality enhancement allows the overall plate to remain thin for compactness while the supported region maintains sufficient rigidity to resist warpage during press processing operations.
3Ease of manufacture
If press processing is performed to create structural features, then manufacturing capability is improved, but the flatness of the liquid ejection surface deteriorates
Solution Approach 1:
The support structure is provided on the liquid ejection side before press processing occurs. This preliminary support maintains the flatness of the liquid ejection surface during the formation of holes and protrusions, ensuring that the surface remains suitable for its function while still allowing necessary structural features to be created.
Solution Approach 2:
The flat plate is functionally segmented into regions: the liquid ejection surface region that requires high flatness and the opposite side that undergoes press processing. The support structure is placed on the ejection side to protect this critical region from distortion while allowing manufacturing operations on the non-critical region.
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 method effectively maintains the flatness of the flat plate, improves the structural strength, and prevents medium contact with the liquid ejection surface, enhancing the precision and durability of the liquid ejecting heads.
Implementation Method 1
the protrusion is formed so as to protrude on a liquid ejection side within the stepped region... since distortion due to drawing (press processing) is suppressed or corrected, it is possible to ensure a flatness of the flat plate after press processing
Implementation Method 2
since the protrusion protruding on the liquid ejection side is provided in the flat plate defining the liquid ejection surface, even if a medium approaches the liquid ejection surface by being deformed (for example, curled), the protrusion becomes hindrance and the medium does not reach the liquid ejection surface
Implementation Method 3
fixing a flow path member in which a flow path supplying the liquid is provided on a side opposite to a side in which the protrusion protrudes to the flat plate
Data Source
AI summary
A manufacturing method of a liquid ejecting head includes providing a stepped region that is formed by half-blanking and has a height different from a plane surface region, and a protrusion that is formed by drawing within the stepped region and protrudes on a liquid ejection side in the plane surface region of a fixing plate defining a liquid ejection surface in which nozzles ejecting liquid are provided; and fixing the liquid ejection section having a flow path member in which a flow path supplying the liquid is provided on a side opposite to a side in which the protrusion protrudes to the flat plate.