Liquid Discharge Head Bonding Holes for Adhesive Control
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Solution Overview
Problem
Existing liquid discharge heads face challenges in determining the appropriate adhesive application amount between bonding members, leading to inconsistent bonding states and varying discharge characteristics due to differences in adhesive rigidity affecting pressure chamber rigidity.
Innovation Solution
A liquid discharge head design featuring three or more holes with different inner volumes and areas in the bonding region, where at least one small hole is fully filled with adhesive, a medium hole is partially filled, and a large hole is partially filled, allowing for precise determination of adhesive application and homogenization of discharge characteristics by setting appropriate drive voltages for each configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to bond the first member and second member, then the bonding strength is improved, but the bonding state becomes inconsistent due to difficulty in controlling adhesive application amount
Solution Approach 1:
The patent creates cavities in the first member before bonding, as a preliminary action to control adhesive distribution. These pre-formed cavities serve as receptacles that guide the adhesive to specific locations and quantities, ensuring consistent bonding states across different bonding operations.
Solution Approach 2:
The patent applies local quality by creating cavities with specific volumes at different locations in the first member. Each cavity is designed with a predetermined volume to control the local adhesive amount, allowing different regions to have different adhesive quantities optimized for their specific bonding requirements.
2Reliability
If adhesive application amount is increased to ensure bonding, then bonding reliability is improved, but discharge characteristics vary due to excessive adhesive affecting pressure chamber rigidity
Solution Approach 1:
The cavities are pre-formed in the first member before bonding occurs, establishing predetermined spaces that will contain specific amounts of adhesive. This preliminary structuring ensures that the adhesive is distributed in controlled quantities, preventing excessive adhesive from compromising the pressure chamber rigidity while maintaining reliable bonding.
Solution Approach 2:
Different cavities have different volumes designed to match the specific bonding requirements of different regions. This local differentiation ensures that each area receives the appropriate amount of adhesive for reliable bonding without excess adhesive affecting the overall pressure chamber rigidity and discharge characteristics.
3Ease of manufacture
If adhesive is used to bond modularized heads, then assembly is simplified, but discharge characteristics vary due to inconsistent adhesive bonding states
Solution Approach 1:
The cavities are created in advance in the first member, providing pre-defined adhesive receptacles that guide the bonding process. This preliminary preparation simplifies the assembly operation by eliminating the need for precise adhesive application control during bonding, while ensuring consistent adhesive distribution and uniform discharge characteristics across modularized heads.
Solution Approach 2:
The cavities provide localized control of adhesive quantity at different positions, with each cavity's volume predetermined to achieve the optimal bonding state for that specific region. This local differentiation ensures consistent bonding quality across all modularized head assemblies, producing uniform discharge characteristics.
Data Source
AI summary
A liquid discharge head includes a first member in which a plurality of channels is arrayed in a longitudinal direction of the first member, a second member bonded to the first member with adhesive, and three or more holes formed in a bonding region between the first member and the second member. An inner volume of each of the three or more holes is different, an area of each of the three or more holes is different, the three or more holes includes a hole having a smallest inner volume among the three or more holes, and the hole is filled with the adhesive in the bonding region.