Liquid Discharge Head Nozzle Row Angles Impact Robustness
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Solution Overview
Problem
Existing liquid discharge heads face challenges in providing sufficient space between connecting portions and nozzle regions, leading to low robustness and vulnerability to external impacts.
Innovation Solution
The liquid discharge head is designed with nozzle rows arranged in a manner that their direction is inclined differently than the ridgeline of the nozzle plate, allowing for increased spacing and robustness by dividing nozzles into sub-nozzle groups, which are arranged to decrease in number towards the ends of the nozzle plate, enhancing recording resolution and reducing damage from external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nozzles are arranged in traditional parallel rows, then manufacturing is simple, but robustness against external impacts is low
Solution Approach 1:
The patent applies asymmetry by arranging nozzle rows at different orientations (first nozzle rows at a first angle, second nozzle rows at a second angle different from the first) rather than using uniform parallel arrangements. This asymmetric angular distribution enhances robustness against external impacts from various directions while maintaining manufacturability through systematic angular positioning.
Solution Approach 2:
The patent segments the nozzle arrangement into distinct groups: first nozzle rows arranged at a first angle and second nozzle rows arranged at a second angle. This segmentation allows each group to be optimized independently for different impact directions, improving overall robustness without significantly complicating the manufacturing process.
2Reliability
If space between connecting portion and nozzle region is reduced, then head size is smaller, but robustness is low
Solution Approach 1:
The patent transitions from a single-dimensional linear nozzle arrangement to a multi-dimensional angular distribution. By arranging nozzle rows at different angles (first angle and second angle relative to the medium feeding direction), the design creates spatial separation between the connecting portion and nozzle regions in multiple directions, enhancing robustness without proportionally increasing head volume.
3Reliability
If nozzle rows are arranged at different angles, then robustness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the angular parameter of nozzle row arrangements to different values (first angle and second angle) to improve robustness. This parameter variation is systematically controlled, allowing manufacturing precision to be maintained through defined angular specifications rather than requiring arbitrary complex positioning.
Data Source
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AI summary
A liquid discharge head (101) includes: a nozzle plate (10) having multiple nozzles (11) arrayed at a predetermined pitch (d) corresponding to a recording resolution in a longitudinal direction of the nozzle plate (10). The multiple nozzles (11) are divided into P number of sub-nozzle groups (SBN1, SBN2), each of the P number of sub-nozzle groups (SBN1, SBN2) including the multiple nozzles (11) as multiple sub-nozzles (11), where P is an integer of one or more, the multiple sub-nozzles (11) are arrayed in the longitudinal direction at a first interval of (d × P), and each of the P number of sub-nozzle groups (SBN1, SBN2) includes sub-nozzle rows (11sb1, 11sb2) each including the multiple sub-nozzles (11) arrayed at the first interval of (d × P) in the longitudinal direction and in a first inclination direction inclined relative to the longitudinal direction and a transverse direction orthogonal to the longitudinal direction.