Head Chip Non-Ejection Channel Apertures for Ink Short Circuit Prevention
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Solution Overview
Problem
In inkjet head chips, conductive ink can flow into non-ejection channels, causing electrode short circuits and compromising ejection performance over time, as existing protective film formations are inadequate on the inner surfaces of these channels.
Innovation Solution
The head chip design includes an actuator plate with alternating jet and non-jet channels, a cover plate, and a communication plate, featuring open apertures at both ends of non-jet channels to introduce protective film formation material, ensuring effective coverage on inner surfaces and preventing electrode short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If protective film is formed only on ejection channel inner surfaces, then manufacturing process is simplified, but electrodes in non-ejection channels may short circuit when ink infiltrates
Solution Approach 1:
Open apertures are formed at both end portions of non-ejection channels before protective film formation, enabling preliminary preparation for complete protective film coverage. This preliminary structural preparation allows the subsequent protective film formation to extend into non-ejection channels, preventing electrode short circuits while maintaining a relatively simple overall process.
Solution Approach 2:
The open apertures at the end portions of non-ejection channels serve as intermediary access points, allowing protective film formation material to enter and coat the inner surfaces of non-ejection channels. These apertures act as mediators between the protective film formation process and the previously inaccessible non-ejection channel interiors, enabling comprehensive protection without complex process changes.
2Reliability
If open apertures are formed at both end portions of non-ejection channels, then protective film coverage is improved, but device structure becomes more complex
Solution Approach 1:
Open apertures are formed only at the necessary end portions of non-ejection channels where protective film access is required, rather than creating openings throughout the entire channel structure. This localized modification provides the necessary protective film coverage while minimizing the addition of structural complexity to the device.
3Productivity
If protective film formation material is introduced through existing channels, then process steps are reduced, but film formation completeness is insufficient
Solution Approach 1:
The open apertures are formed in advance at both end portions of non-ejection channels, creating preliminary access pathways that enable complete protective film formation. This preliminary structural preparation allows the protective film formation material to reach all necessary surfaces through the existing channel structures, achieving both process efficiency and formation completeness.
Solution Approach 2:
The open apertures serve as intermediary access points that enable protective film formation material to reach the inner surfaces of non-ejection channels. These apertures act as mediators between the material introduction process and the target surfaces, ensuring complete film coverage without requiring complex direct access structures.
Data Source
AI summary
There are provided a head chip, a liquid jet head, a liquid jet recording device, and a method of manufacturing the head chip each capable of preventing the short circuit of electrodes by ink to maintain an excellent ejection performance over a long period of time. The head chip according to an aspect of the present disclosure includes an actuator plate, a cover plate, and an intermediate plate. In the actuator plate, open apertures which communicate an inside and an outside of a non-ejection channel with each other are formed in both end portions of the non-ejection channel in a Y direction. In the actuator plate, open apertures which communicate an inside and an outside of a non-ejection channel with each other are formed in both end portions of the non-ejection channel in the Y direction.