Inkjet Line Drawing Middle-Start Inversion
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Solution Overview
Problem
The existing inkjet methods for drawing linear patterns often result in thick ends at the starting position of the pattern, which can compromise the functional characteristics of the pattern.
Innovation Solution
The method involves starting the drawing of the linear pattern from a middle portion rather than the end, using an inkjet head with multiple nozzles arranged in specific configurations, and controlling the dot pitch and contact angles to ensure uniformity and prevent bulges and jaggies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the linear pattern is drawn by ejecting droplets from the start position, then the drawing process is simple, but the end portion becomes thick which lowers functional characteristic
Solution Approach 1:
The patent applies inversion by starting the droplet ejection from the middle position of the linear pattern rather than from the end position. This reverses the conventional drawing approach and prevents the thickening effect at the start position, achieving uniform line width while maintaining ease of manufacture.
2Manufacturing precision
If the dot pitch is reduced to improve line density, then more droplets are needed, but the complexity of controlling dot pitch and contact angles increases
Solution Approach 1:
The patent applies parameter changes by establishing specific relationships between dot pitch (p), droplet diameter (d), and contact angle (θ) through the formula p ≥ d/sin(θ). This mathematical relationship simplifies the control of multiple parameters by reducing them to a manageable constraint, enabling precise line density control without excessive complexity.
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 approach prevents the formation of thick ends at the starting position, maintains line uniformity, and avoids the generation of bulges and jaggies, ensuring a smooth and functional linear pattern.
Implementation Method 1
a method for directly drawing a wiring pattern of an electronic circuit on a substrate by using an inkjet method. Specifically, a printed circuit board having a desirable circuit pattern thereon can be obtained by directly drawing the desirable circuit pattern on a substrate. The desirable circuit pattern is drawn by ejecting, from an inkjet-type ejection head (inkjet head), droplets of dispersion liquid
Implementation Method 2
a method for drawing a linear pattern by uniting droplets of liquid that have landed on a substrate is proposed in Japanese Unexamined Patent Publication No. 2003-266669 (Patent Document 1). In Patent Document 1, the droplets of liquid are united by utilizing a phenomenon that the droplets of liquid, which are wet, spread after they land onto the substrate.
Implementation Method 3
when the dot pitches of the droplets of liquid are p[μm], the diameters of the droplets of liquid are d[μm], and contact angles between the non-permeable medium and the droplets of liquid are θ[rad]
Data Source
AI summary
When a linear pattern is drawn on a non-permeable medium by ejecting droplets of liquid onto the non-permeable medium by using an inkjet method, drawing of the linear pattern is started from a middle portion of the linear pattern.