Liquid Discharge Head Nozzle Structure for Stable Ink Flow
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Solution Overview
Problem
Existing liquid discharge heads face challenges in maintaining consistent discharge performance due to variations in fluid resistance and sealing efficiency across multiple nozzles, leading to inconsistent ink discharge characteristics.
Innovation Solution
The liquid discharge head incorporates cylindrical protrusions with varying outer diameters and sealing members with different diameters, along with edge-processed nozzle and needle valve edges, to stabilize fluid resistance and improve sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform sealing members and nozzles are used across multiple nozzles, then manufacturing is simplified, but fluid resistance varies causing inconsistent discharge performance
Solution Approach 1:
The patent applies local quality by making each sealing member's diameter correspond to the specific outer diameter of its associated nozzle. This means that while the overall structure remains standardized, the sealing members are locally adapted to match their respective nozzles' dimensions, ensuring consistent fluid resistance and discharge performance across all nozzles without requiring complete customization of the entire system.
2Reliability
If edge processing is applied to nozzles and needle valves, then sealing efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The patent implements preliminary action by performing edge processing on nozzles and needle valves in advance during the manufacturing process. This preliminary treatment creates optimal sealing surfaces before assembly, ensuring that when the components are put together, the sealing efficiency is already maximized. The edge processing is done as a preparatory step that simplifies the overall assembly process while maintaining high sealing performance.
Data Source
AI summary
A liquid discharge head includes: a nozzle plate having: a first nozzle; and a second nozzle, from each of which a liquid is dischargeable from a first face of the nozzle plate; a channel communicating with each of the first nozzle and the second nozzle, the channel on a second face opposite to the first face of the nozzle plate; multiple cylindrical protrusions having: a first cylindrical protrusion around the first nozzle and protruding continuously from an inner wall face of the first nozzle toward the channel, the first cylindrical protrusion having a first outer diameter; and a second cylindrical protrusion around the second nozzle and protruding continuously from an inner wall face of the second nozzle toward the channel, the second cylindrical protrusion having a second outer diameter larger than the first outer diameter of the first cylindrical protrusion.