Liquid Discharge Control for Uniform Coating on 3D Curved Surfaces
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Solution Overview
Problem
Existing liquid discharge apparatuses struggle to effectively apply liquid to three-dimensional curved surfaces by accurately adjusting the discharge amount based on the vertical height and curvature of the application surface.
Innovation Solution
A liquid discharge apparatus with a head and circuitry that controls discharge based on the vertical height of the application position, using a controller to adjust the ink amount and movement to ensure uniform application on curved surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the liquid discharge apparatus applies liquid to a three-dimensional curved surface using a fixed discharge amount, then the discharge process is simple, but the film thickness becomes non-uniform due to surface curvature and gravitational dripping
Solution Approach 1:
The patent applies local quality by adjusting the discharge amount of liquid droplets based on the specific characteristics of each discharge position on the curved surface. The control unit calculates and determines optimal discharge amounts for different locations, considering factors like surface curvature and vertical height, thereby achieving uniform film thickness across the entire curved surface despite varying local conditions
Solution Approach 2:
The patent implements parameter changes by dynamically modifying the discharge amount parameter according to the vertical height and curvature characteristics of different discharge positions. The control unit varies the liquid droplet discharge amount based on calculated position parameters, enabling adaptation to the three-dimensional curved surface geometry and compensating for gravitational effects
2Manufacturing precision
If the liquid discharge apparatus increases discharge amount at higher positions to compensate for gravitational dripping, then film thickness uniformity improves, but the control complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating the optimal discharge amounts for all discharge positions before actual liquid application. The control unit computes the required discharge amounts based on the curved surface geometry and gravitational effects in advance, storing these values for subsequent discharge operations, thereby simplifying real-time control while maintaining precision
Solution Approach 2:
The patent implements feedback by using calculated vertical height and curvature information to adjust discharge amounts. The control unit determines discharge parameters based on the relationship between position characteristics and required liquid application, creating a closed-loop control system that compensates for gravitational dripping and surface geometry effects
3Adaptability or versatility
If the liquid discharge apparatus uses a reference length compared with curve length to adjust discharge amount, then adaptation to curved surfaces is achieved, but the method is insufficient for three-dimensional curved surfaces with varying vertical heights
Solution Approach 1:
The patent applies dimensionality change by extending the control approach from two-dimensional curved surface adaptation (reference length vs. curve length) to three-dimensional adaptation by incorporating vertical height as an additional control dimension. The control unit calculates discharge amounts based on both horizontal curvature characteristics and vertical position, enabling precise liquid application on complex three-dimensional surfaces
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
The apparatus achieves uniform ink application by adjusting ink amounts and movement to compensate for surface curvature, resulting in a consistent film thickness despite gravitational dripping.
Implementation Method 1
the head discharges liquid to apply the liquid to an application surface
Data Source
AI summary
A liquid discharge apparatus includes a head and circuitry. The head discharges liquid to apply the liquid to an application surface. The circuitry controls discharge of the liquid from the head based on a vertical height of an application position at which the liquid is applied on the application surface.