Liquid Discharge Head Sealing via Lyophilic Recess Adhesion
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Solution Overview
Problem
In liquid discharge heads, the lack of secure sealing between the nozzle substrate and the cover member leads to ink intrusion and potential electrical component damage, along with positional shifts due to incomplete securing.
Innovation Solution
A continuous recess on the nozzle substrate is made lyophilic and used for adhesive application to securely join the cover member, ensuring liquid repellency on the substrate's surface and preventing ink intrusion while maintaining positional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cover member is merely fitted into the liquid discharge head without adhesive securing, then the assembly is simple and easy to manufacture, but ink intrudes the clearance between the nozzle substrate and the cover member and adheres to the electric part, causing potential breakdown
Solution Approach 1:
An adhesive is introduced as an intermediary substance between the nozzle substrate and the cover member to prevent ink intrusion. The adhesive fills the clearance gap that occurs when the cover member is fitted onto the nozzle substrate, creating a seal that blocks ink from reaching the electric part while still allowing for relatively simple assembly.
Solution Approach 2:
The liquid repellent layer is applied selectively to specific areas of the nozzle substrate - particularly to regions where ink intrusion is most likely to occur at the interface with the cover member. This localized treatment provides targeted protection without requiring complete coating of the entire substrate, balancing protection needs with manufacturing simplicity.
2Ease of manufacture
If the cover member is merely fitted into the liquid discharge head without adhesive securing, then the assembly process is simple, but the cover member and the nozzle substrate are not completely secured, leading to positional shift between the cover member and the nozzle substrate
Solution Approach 1:
The adhesive serves as a mediator that bonds the cover member to the nozzle substrate, eliminating relative movement and positional shifts. The adhesive layer creates a fixed connection that maintains precise alignment between the cover member and the nozzle substrate, ensuring that reference positions remain accurate while still allowing for straightforward assembly procedures.
Solution Approach 2:
The liquid repellent layer is formed on the nozzle substrate before the adhesive application and assembly steps. This preliminary surface treatment ensures that when the adhesive is applied and the cover member is attached, the positional relationship is immediately secured without subsequent shifting, maintaining manufacturing precision from the outset.
3Object-affected harmful factors
If a liquid repellent layer is formed on the entire nozzle substrate, then liquid repellency is maximized, but the adhesive cannot properly adhere to the substrate surface
Solution Approach 1:
The liquid repellent layer is applied selectively to specific regions of the nozzle substrate that require liquid repellency (such as areas exposed to ink), while leaving other regions (where adhesive application is needed) free of the liquid repellent coating. This localized application ensures that adhesive can properly bond to the substrate surface in the designated areas while the liquid repellent areas maintain their protective properties.
Solution Approach 2:
The nozzle substrate surface is segmented into distinct functional zones: one zone with liquid repellent layer for ink resistance and another zone without the layer for adhesive bonding. This segmentation allows each area to perform its specific function optimally - the liquid repellent zone prevents ink intrusion while the non-coated zone provides strong adhesive attachment for the cover member.
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 enhances the sealing property and precision of the liquid discharge head, reducing the risk of electrical component damage and improving liquid resistance by securely adhering the cover member to the nozzle substrate.
Implementation Method 1
An inside of the recess is lyophilic to the liquid and is provided with an adhesive. The nozzle substrate is joined to the cover member with the adhesive.
Implementation Method 2
The nozzle arrangement area has a liquid repellency with respect to the liquid.
Implementation Method 3
An inside of the recess is lyophilic to the liquid
Data Source
AI summary
A liquid discharge head includes a nozzle substrate and a cover member. The nozzle substrate includes a liquid discharge surface, a plurality of nozzles, and a continuous recess. The plurality of nozzles is arranged in a nozzle arrangement area on the liquid discharge surface and configured to discharge liquid from the liquid discharge surface. The continuous recess surrounds the nozzle arrangement area on the liquid discharge surface. The cover member is joined to the nozzle substrate with the nozzle arrangement area being exposed. The nozzle arrangement area has a liquid repellency with respect to the liquid. An inside of the recess is lyophilic to the liquid and is provided with an adhesive, and the nozzle substrate is joined to the cover member with the adhesive.