Liquid Ejection Head Adhesive Overflow Relief Groove
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Solution Overview
Problem
The existing liquid ejection heads face clogging issues due to adhesive agent overflowing from the bonding zone entering and filling dummy pressure chambers and narrow individual channels, leading to blockages.
Innovation Solution
A liquid ejection head design featuring a stack structure with individual and dummy channels, along with relief grooves to trap excessive adhesive agent, preventing it from entering the narrow channels and thus reducing clogging. The design includes supply and return throttle channels with varying cross-sectional areas and relief grooves connected to dummy channels to manage adhesive overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive agent is used to bond plates in the stack structure, then the plates are securely joined together, but the adhesive agent overflows and clogs the narrow individual channels
Solution Approach 1:
The harmful adhesive agent is extracted from the bonding process by introducing a dummy pressure chamber that collects and isolates the overflow adhesive, preventing it from entering the individual channels while maintaining the bonding function
Solution Approach 2:
A dummy pressure chamber acts as an intermediary between the bonding zone and the individual channels, serving as a buffer that captures adhesive overflow and prevents it from clogging the functional channels
2Reliability
If dummy pressure chambers are added to the stack structure, then adhesive overflow is contained, but the device complexity increases
Solution Approach 1:
The dummy pressure chamber serves multiple functions: it contains adhesive overflow, maintains structural integrity of the stack, and provides a pressure equalization chamber, thereby managing complexity through functional consolidation
Data Source
AI summary
A liquid ejection head includes a stack structure including plates stacked and bonded with an adhesive agent, individual channels formed in the stack structure, dummy channels formed in the stack structure separately from the individual channels, and a first relief groove formed in the stack structure separately from the individual channels and configured to trap therein an excessive adhesive agent. Each individual channel includes a pressure chamber to which pressure is applied for liquid ejection form a nozzle, a supply throttle channel connected to the pressure chamber, and a return throttle channel communicating with the pressure chamber. The supply throttle channel and the return throttle channel each have a smaller cross-sectional area than the pressure chamber. The dummy channels include dummy chambers arranged laterally to an array of the pressure chambers arranged in an array direction. The first relief groove is connected to the dummy channels.