Liquid Discharge Head Cover Member Insulation Shielding
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Solution Overview
Problem
In liquid discharge heads, liquid mist can adhere to sealing agents, causing them to detach and potentially lead to electrode corrosion and electric circuit failures due to liquid exposure.
Innovation Solution
A liquid discharge head design that includes a cover member to protect insulation members covering electrodes, preventing liquid contact and enhancing the reliability of the electric circuit by using a cover member to shield the sealing agent from ink mist.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing agent is used to cover electrodes, then liquid contact with electrodes is prevented, but liquid mist can adhere to the sealing agent causing detachment and potential electrode corrosion
Solution Approach 1:
An insulation member is introduced as an intermediary component between the electrode and the sealing agent. This insulation member has a liquid-resistant surface that prevents liquid mist from adhering to the sealing agent, while still allowing the sealing agent to fulfill its protective function over the electrode. The intermediary thus resolves the contradiction by blocking the harmful adhesion path without compromising the protective function.
Solution Approach 2:
The insulation member is implemented as a thin film or shell structure that covers the electrode and extends over the sealing agent. This thin film creates a liquid-resistant barrier that prevents liquid mist from reaching the sealing agent surface, thereby preventing adhesion and subsequent detachment while maintaining the sealing agent's protective role.
2Device complexity
If the sealing agent is exposed to liquid mist, then the structure remains simple, but the sealing agent detaches and liquid reaches the electrodes causing circuit failure
Solution Approach 1:
The sealing structure is segmented into distinct functional components: the sealing agent that contacts the electrode, the insulation member that contacts the sealing agent, and the cover member that provides external protection. This segmentation allows each component to perform its specific function optimally while collectively enhancing reliability without excessive complexity.
Solution Approach 2:
The structure employs a nested arrangement where the insulation member is positioned within the space defined by the cover member and the recording element substrate, and where the sealing agent is positioned between the electrode and the insulation member. This nested configuration provides multiple layers of protection in a compact arrangement, enhancing reliability without significantly increasing overall device complexity.
3Reliability
If a cover member is added to protect the insulation member, then liquid contact with the sealing agent is suppressed, but the device structure becomes more complex
Solution Approach 1:
The cover member is designed to serve multiple functions simultaneously: it provides mechanical protection for the insulation member and sealing agent, creates a liquid-tight seal over the discharge aperture area, and maintains the structural integrity of the recording element substrate assembly. This multi-functionality justifies the additional component by consolidating multiple protective roles into a single element.
Solution Approach 2:
The protective function of the cover member is merged with the existing structural framework of the recording element substrate. The cover member is positioned to work in conjunction with the discharge aperture forming member and substrate structure, integrating the protection function into the overall device architecture rather than adding a completely separate protective system.
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
The solution effectively reduces the likelihood of ink mist adhering to the sealing agent, preventing detachment and subsequent electric circuit failures, thus improving the reliability and longevity of the liquid discharge head.
Implementation Method 1
a substrate having a pressure generating element that pressurizes the liquid so as to discharge the liquid
Data Source
AI summary
A liquid discharge head includes a recording element substrate. The recording element substrate includes a discharge aperture forming member defining a discharge aperture from which a liquid is discharged and a substrate having a pressure generating element that pressurizes the liquid so as to discharge the liquid. The liquid discharge head also includes a cover member that defines an opening through which the discharge aperture is exposed. The cover member is disposed on a side of the recording element substrate on which the discharge aperture is formed. In the liquid discharge head, the recording element substrate further includes an electrode disposed on a side of the substrate on which the discharge aperture forming member is formed and an insulation member that covers the electrode. In addition, the insulation member is covered by the cover member.