Liquid Ejecting Head Terminal Segmentation for Bonding Reliability
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Solution Overview
Problem
The existing liquid ejecting heads face issues with weakened bonding force between the electrode terminal and the wiring terminal due to reduced contact area and potential misalignment, leading to increased electrical resistance and poor connection.
Innovation Solution
The electrode terminal is formed in a series over the bonding region with multiple spaced-apart terminals on the wiring terminal, allowing an adhesive to fill the gaps and enhance bonding force, even if the terminals are misaligned, and using a non-conductive adhesive to reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact area between wiring terminal and electrode terminal is increased, then electrical resistance is reduced, but bonding force is weakened due to adhesive filling gaps
Solution Approach 1:
The wiring terminal is divided into multiple separate contact portions instead of a single continuous contact area. This segmentation allows adhesive to fill gaps between the segments, creating strong bonding while maintaining multiple electrical contact points that reduce overall electrical resistance.
Solution Approach 2:
Different regions of the terminal structure have different functions: the contact portions are designed for electrical conduction while the gaps between them are specifically designed to receive adhesive for bonding. This local differentiation optimizes both electrical and mechanical properties simultaneously.
2Reliability
If the bonding region is made larger to ensure adequate contact area, then electrical resistance is reduced, but misalignment between terminals increases leading to poor connection
Solution Approach 1:
By dividing the contact area into multiple discrete contact portions arranged in a specific pattern, the invention creates a more forgiving bonding region. Even if the terminals are slightly misaligned, at least some contact portions will maintain proper electrical connection, reducing the impact of alignment errors.
Solution Approach 2:
The multiple spaced-apart contact portions act as a buffer against misalignment. If one contact portion is misaligned, the others can still provide adequate electrical connection, cushioning the overall system against the effects of imperfect alignment.
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 strengthens the bonding force between the wiring and electrode terminals, prevents increased electrical resistance, and ensures reliable conduction, thereby preventing poor connections and reducing manufacturing costs.
Implementation Method 1
a piezoelectric element (a type of pressure generating element) bonded to a diaphragm to generate pressure fluctuations in the ink inside the pressure chamber
Implementation Method 2
bonded to each other by an adhesive such as a non-conductive paste (NCP), a non-conductive film (NCF), an anisotropic conductive paste (ACP), and an anisotropic conductive film (ACF)
Data Source
AI summary
In a liquid ejecting head that includes a pressure generating element which generates pressure fluctuations in a liquid inside a pressure chamber by applying a voltage to an electrode and a wiring member which has a wiring terminal electrically connected to the electrode, and that ejects the liquid through a nozzle by applying the voltage to the electrode and driving the pressure generating element, the liquid ejecting head includes an electrode terminal that is connected to the electrode and is formed in a series over at least a partial region in a bonding region to which the wiring terminal is bonded. The wiring terminal has multiple terminals which are formed by being spaced apart from one another in the bonding region.