Liquid Discharge Head with Inclined Port Array for Crosstalk Reduction
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Solution Overview
Problem
Crosstalk in liquid discharge heads leads to unstable liquid discharge and image quality degradation, particularly in high-density two-dimensionally arranged discharge ports, as pressure fluctuations from one discharge port interfere with others, causing density unevenness in recorded images.
Innovation Solution
The liquid discharge head is designed with discharge ports arranged in an inclined manner perpendicular to the conveyance direction, divided into groups for time divisional operation, where each group discharges liquid simultaneously, and different groups successively discharge, with the inclination angle calculated to minimize misalignment and crosstalk influence, using a common supply path to attenuate pressure waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If discharge ports are two-dimensionally arranged at high density to enhance image quality, then image quality is improved, but crosstalk occurs causing discharge instability and density unevenness
Solution Approach 1:
The discharge ports are divided into multiple groups (first group and second group) that discharge liquid at different timings. This segmentation in time allows high-density arrangement while reducing crosstalk interference between adjacent discharge ports, maintaining both image quality and discharge stability.
Solution Approach 2:
The liquid discharge operation is performed in a periodic cycle where the first group discharges liquid first, followed by the second group. This periodic action pattern creates time separation between discharges from different groups, reducing pressure fluctuations and crosstalk while maintaining high-density discharge port arrangement for image quality.
2Reliability
If discharge timing is shifted on a block basis to reduce crosstalk, then crosstalk influence is reduced, but misalignment of liquid landing position occurs degrading image quality
Solution Approach 1:
Instead of shifting discharge timing uniformly across all discharge ports (one-dimensional approach), the invention divides discharge ports into multiple groups and shifts timing by group. This creates a two-dimensional timing structure that reduces crosstalk while maintaining spatial alignment of liquid landing positions, resolving the contradiction between crosstalk reduction and image quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces crosstalk influence, ensuring stable liquid discharge and improved image quality by aligning liquid landing positions and optimizing discharge timing, thereby preventing image quality degradation.
Implementation Method 1
each including thereinside an energy generating element configured to generate energy to be used for discharging liquid
Implementation Method 2
a common supply path communicating with the plurality of pressure chambers and configured to supply liquid to the plurality of pressure chambers
Data Source
AI summary
A discharge port array is inclined to a second direction B at an angle θ that satisfies a relation of tan θ=d2/(N×d1), where d1 is a distance between discharge ports within the discharge port array in the second direction B, and d2 is a distance between two adjacent discharge ports within each group in a first direction.