Liquid Ejecting Head Adhesive Sealing Design
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Solution Overview
Problem
Existing liquid ejecting heads face issues with adhesive variations leading to potential gaps between members, which can result in inadequate sealing, allowing undesired substances like ink or dust to enter the internal space and compromise the reliability of the device.
Innovation Solution
Incorporating an adhesive receiving portion with a chamfer on the members to manage adhesive flow, ensuring the adhesive fills the joining portion effectively and preventing gaps, even with variations in adhesive amount, and using a second adhesive with lower viscosity to fill gaps not filled by the first adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the amount of the first adhesive is reduced to prevent squeeze-out, then adhesive protrusion is avoided, but gaps form between members due to insufficient filling
Solution Approach 1:
The patent divides the sealing function into two stages: first adhesive for primary bonding and gap filling, second adhesive for final sealing. This segmentation allows each adhesive to be optimized for its specific function without compromising the other.
Solution Approach 2:
The first adhesive acts as an intermediary between the members, filling gaps and providing initial bonding, while the second adhesive provides the final sealing. This intermediary approach ensures complete filling without squeeze-out issues.
2Reliability
If the amount of the first adhesive is increased to ensure complete filling, then gap formation is prevented, but adhesive squeezes out from the joining portion
Solution Approach 1:
The patent segments the adhesive application into two controlled steps with different purposes, allowing the first adhesive to be applied in sufficient amount for gap filling while the second adhesive completes the sealing without excessive application.
Solution Approach 2:
The first adhesive is applied preliminarily to fill gaps and provide initial bonding before the second adhesive is applied. This preliminary action ensures complete filling while controlling the total adhesive usage.
3Manufacturing precision
If adhesive variations occur during manufacturing, then adhesion quality becomes inconsistent, but gap formation increases
Solution Approach 1:
The patent prepares for adhesive variations by designing a two-stage process where the first adhesive provides initial bonding and gap filling, cushioning against variations in adhesive amount or quality, while the second adhesive ensures final sealing reliability.
Solution Approach 2:
The patent changes the parameters of the adhesive system by using two different adhesives with different properties (viscosity, curing time, strength) to compensate for manufacturing variations and ensure consistent sealing quality.
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 solution enhances the sealing reliability of the liquid ejecting head by preventing adhesive squeeze-out and ensuring complete filling of the joining areas, thereby inhibiting the entry of external matter into the internal space, thus improving the overall performance and reliability of the device.
Implementation Method 1
a first adhesive that adheres the second member to the first member
Implementation Method 2
a second adhesive that adheres the third member to the first member and the second member
Implementation Method 3
an adhesive receiving portion that accepts an inflow of at least one of the first adhesive and the second adhesive so as to prevent the at least one adhesive from squeezing out
Data Source
AI summary
A liquid ejecting head includes a head body, a first member that has a first surface and a second surface and that holds the head body, a second member that has a third surface and that is adhered to the first surface by a first adhesive so that the third surface is along planar directions of the second surface, and a third member that is disposed so as to extend over the second surface and the third surface and that is adhered to the second surface and the third surface by a second adhesive. At an intersection portion at which the first adhesive and the second adhesive contact, an adhesive receiving portion that accepts inflow of at least one of the first adhesive and the second adhesive is formed.