Liquid Discharge Head Tilt Adjustment for Banding Reduction
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Solution Overview
Problem
Existing liquid discharge apparatuses face challenges in achieving optimal dot recording quality due to banding issues caused by nozzle pitch variations and deviation errors, leading to suboptimal dot placement and pattern randomness during interlace recording processes.
Innovation Solution
The apparatus incorporates a tilt-varying mechanism that adjusts the head's tilt angle during interlace recording, varying the nozzle pitch in both the main-scanning and sub-scanning directions to maintain consistent dot placement and increase pattern randomness, thereby reducing banding and improving recording quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the head is kept at a fixed tilt angle during interlace recording, then the nozzle pitch remains constant which simplifies control, but dot placement accuracy deteriorates due to banding issues and deviation errors
Solution Approach 1:
The patent applies the dynamics principle by making the head tilt angle variable rather than fixed. The tilt adjuster dynamically changes the head tilt angle during interlace recording operations, allowing the nozzle pitch to be varied between different recording passes. This dynamic adjustment compensates for deviation errors and reduces banding issues, thereby improving dot placement accuracy without requiring overly complex control mechanisms.
Solution Approach 2:
The patent implements parameter changes by modifying the head tilt angle as a key parameter during recording. By changing the tilt angle between different interlace passes, the nozzle pitch varies accordingly, which disperses dot position deviations and reduces systematic errors. This parameter variation approach improves manufacturing precision while maintaining manageable device complexity through controlled adjustments.
2Ease of operation
If the nozzle pitch is kept constant during interlace recording, then the recording process is simpler to control, but dot pattern randomness decreases leading to visible banding
Solution Approach 1:
The patent makes the nozzle pitch dynamic by varying the head tilt angle during interlace recording. This dynamic adjustment introduces variability in dot placement positions across different recording passes, increasing pattern randomness and reducing visible banding. The control system manages this complexity through coordinated adjustment of tilt angle and recording parameters.
Solution Approach 2:
The patent changes the nozzle pitch parameter by adjusting the head tilt angle between recording passes. This parameter variation disrupts systematic dot placement patterns, creating more random dot distributions that reduce banding visibility. The ease of operation is maintained through automated control of these parameter changes during the recording process.
3Manufacturing precision
If the head tilt angle is varied during interlace recording, then dot position deviations are dispersed and banding is reduced, but the device complexity increases due to the tilt adjuster mechanism
Solution Approach 1:
The patent introduces a tilt adjuster mechanism that enables dynamic head tilt angle variation. This dynamic capability allows the system to disperse dot position deviations and reduce banding by changing the nozzle pitch between passes. The increased device complexity is justified by the significant improvement in manufacturing precision and recording quality.
Solution Approach 2:
The patent implements parameter changes through the tilt adjuster, which modifies the head tilt angle to vary nozzle pitch during recording. This parameter variation effectively disperses systematic errors and improves dot recording quality. The device complexity increase is offset by the substantial gains in recording precision and uniformity.
4Stability of the object's composition
If the nozzle pitch varies in both main-scanning and sub-scanning directions, then pattern randomness increases and banding is reduced, but control precision requirements increase
Solution Approach 1:
The patent applies dynamics by enabling variable head tilt angles that affect nozzle pitch in both main-scanning and sub-scanning directions. This dynamic variation increases pattern randomness and reduces banding. The control system manages the increased precision requirements through coordinated control of tilt adjustments and recording parameters.
Solution Approach 2:
The patent implements parameter changes that affect nozzle pitch in multiple directions simultaneously. By varying the head tilt angle, the system changes the effective nozzle pitch in both main-scanning and sub-scanning directions, creating more random dot patterns. The control precision requirements are managed through automated coordination of these parameter changes.
Data Source
AI summary
A liquid discharge apparatus records dots of liquid on a medium by interlace recording. The liquid discharge apparatus includes a head, a mover, a tilt adjuster, and control circuitry. The head discharges the liquid from nozzles. The mover relatively moves the head and the medium in each of main-scanning and sub-scanning directions. The tilt adjuster changes a tilt of the head with respect to the medium. The control circuitry controls recording on the medium. The control circuitry causes the mover to relatively move the head and the medium in the main-scanning direction with the head tilted to at least a first angle or a second angle. An interval between adjacent nozzles in the sub-scanning direction is a first interval in a state where the tilt is the first angle. The interval is a second interval different from the first interval in a state where the tilt is the second angle.