Liquid Ejecting Head Adhesive Layout for Overflow Control
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Solution Overview
Problem
Existing liquid ejecting heads face challenges in suppressing adhesive overflow while maintaining adhesive strength, particularly in narrow adhesive regions, leading to potential decreases in bonding strength.
Innovation Solution
The design incorporates a first member with an adhesive region featuring a recessed area and a non-recessed area with increased distance from the member, ensuring that the adhesive region's line segments follow specific length ratios and distances to manage adhesive overflow and maintain strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the distance between the fixing plate and the holder unit is increased to suppress adhesive overflow in narrow adhesive regions, then adhesive overflow is suppressed, but adhesive strength decreases
Solution Approach 1:
The invention applies different structural configurations to different regions of the adhesive interface. In wide adhesive regions, a recess is provided to capture excess adhesive. In narrow adhesive regions, the distance between members is increased to prevent overflow. This localized adaptation of the structure to regional requirements resolves the contradiction between preventing overflow and maintaining strength.
Solution Approach 2:
The adhesive region is divided into multiple segments based on width characteristics. The invention identifies narrow portions within the adhesive region and applies different overflow suppression strategies to these segments versus the rest of the adhesive region, allowing optimized control of adhesive behavior in each segment.
2Object-generated harmful factors
If a recess is provided in the holder unit or fixing plate to suppress adhesive overflow, then adhesive overflow is suppressed, but the structure becomes more complex
Solution Approach 1:
Instead of providing recesses throughout the entire structure, the invention selectively provides recesses only in regions where the adhesive region has a wide width. In narrow adhesive regions, simplicity is maintained by only increasing the distance between members. This localized application reduces overall structural complexity while still effectively suppressing adhesive overflow where needed.
3Manufacturing precision
If the adhesive region width is narrow, then assembly precision is improved, but adhesive overflow control becomes difficult
Solution Approach 1:
The invention performs preliminary action by pre-defining the distance between the fixing plate and holder unit in narrow adhesive regions before adhesive application. This predetermined spacing creates a natural barrier that prevents adhesive overflow without requiring additional complex control mechanisms during the assembly process.
Data Source
AI summary
A liquid ejecting head includes a fixing plate, a holder stacked in a first direction on the fixing plate and having a first surface, and an adhesive that adheres the fixing plate to the first surface, in which the first surface has an adhesive region in contact with the adhesive, a first line segment in the adhesive region is longer than a second line segment in the adhesive region, a region of the first surface that overlaps the first line segment has first adhesive regions and a first recess, and a region of the adhesive region that overlaps the second line segment has a distance in the first direction from the fixing plate that is greater than a distance in the first direction between the fixing plate and the first adhesive region.