Bonded Substrate Checking Structure for Adhesion Detection
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Solution Overview
Problem
Existing bonded substrates in liquid discharge heads lack effective mechanisms for ensuring optimal adhesive state, leading to potential issues with insufficient or excessive adhesion, which can affect the reliability and performance of the liquid discharge process.
Innovation Solution
A novel bonded substrate design that incorporates a checking structure on the first substrate with distinct surface portions of varying heights, allowing for the detection of insufficient or excessive adhesion by the adhesive, ensuring proper bonding between the first and second substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to bond the first and second substrates, then bonding strength is improved, but it becomes difficult to detect whether the adhesion is sufficient or excessive
Solution Approach 1:
The checking structure is prepared in advance on the first substrate with specific surface portions at different heights. These pre-configured surfaces will interact with the adhesive during bonding to indicate the adhesion state, allowing detection before the bonding process is complete.
Solution Approach 2:
The checking structure utilizes surface height variations that become visually detectable when adhesive contacts them. The different heights create distinguishable surface features that indicate whether adhesive is present in sufficient or excessive amounts, enabling visual inspection of the bonding quality.
2Ease of manufacture
If a simple bonding process is used, then manufacturing complexity is reduced, but reliability of the bonding is compromised
Solution Approach 1:
The checking structure enables the bonding process to self-validate. The adhesive naturally interacts with the checking structure surfaces during application, and the resulting configuration provides automatic indication of proper adhesion without requiring external inspection equipment or complex verification steps.
Solution Approach 2:
The checking structure is pre-configured on the first substrate before bonding occurs. This preliminary preparation includes creating surface portions at specific heights that will automatically indicate bonding quality when the adhesive is applied and bonds to the second substrate.
3Strength
If adhesive amount is increased to ensure sufficient bonding, then bonding strength is improved, but excessive adhesion defects may occur
Solution Approach 1:
The checking structure has different surface portions at different heights, creating local variations in the bonding interface. These local height differences allow the adhesive to be detected at specific locations, enabling determination of whether the adhesive amount is appropriate, insufficient, or excessive in different areas.
Solution Approach 2:
The checking structure provides immediate visual feedback about the adhesive state during the bonding process. By observing which surface portions of the checking structure are contacted by the adhesive, operators can determine in real-time whether the adhesive amount is appropriate or needs adjustment.
Data Source
AI summary
A bonded substrate includes a first substrate, a second substrate bonded to the first substrate with adhesive applied to the second substrate, and a checking structure disposed on the first substrate and facing the second substrate. The checking structure includes a bonding surface portion to be adhered to the second substrate with the adhesive and an insufficiency detection surface to detect insufficient adhesion, a height of the insufficiency detection surface being lower than a height of the bonding surface portion. The adhesive does not contact the insufficiency detection surface when an adhesion state of the bonding surface portion to the second substrate with the adhesive is insufficient, and the adhesive contacts the insufficiency detection surface when the adhesion state of the bonding surface portion to the second substrate with the adhesive is sufficient.