Dynamic Light Curing Feedback Control for Conductive Inks
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Solution Overview
Problem
Existing curing processes for printed electronics, particularly conductive inks, require high temperatures, which can be detrimental to other materials and limit compatibility, necessitating improved methods that minimize heat diffusion to adjacent materials.
Innovation Solution
A dynamic curing process using a light source with adjustable operational parameters, monitored by a feedback system, applies brief but intense pulses of light to cure conductive inks on a substrate while minimizing heat transfer to surrounding materials, allowing for precise control and faster curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature thermal curing is used to cure conductive inks, then the conductive ink cures effectively, but adjacent temperature-sensitive materials are damaged
Solution Approach 1:
The curing process is segmented into multiple sequential stages with different temperature profiles. The process includes a first curing stage at a first temperature and a second curing stage at a second temperature, allowing the conductive ink to cure effectively while limiting the maximum temperature exposure to protect adjacent temperature-sensitive materials from heat damage
Solution Approach 2:
The curing process uses periodic temperature cycling rather than continuous high-temperature exposure. The method involves cycling the temperature between different levels (first temperature and second temperature) during the curing process, which maintains curing effectiveness while reducing cumulative heat damage to adjacent materials
2Productivity
If conventional thermal curing methods are used, then conductive materials are converted to conductive paths, but the process is slow and causes significant heating of adjacent components
Solution Approach 1:
The curing process employs periodic temperature cycling with multiple stages at different temperatures. This approach accelerates the overall curing process compared to conventional single-stage methods while controlling the temperature profile to minimize heat diffusion to adjacent components during each cycle
Solution Approach 2:
The method changes temperature parameters dynamically during the curing process by implementing multiple curing stages with different temperature levels. This parameter variation optimizes both curing speed and heat control, achieving faster curing than conventional methods while limiting heat diffusion to adjacent components
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 method enables optimal conversion of conductive materials into conductive paths with higher quality and increased compatibility with temperature-sensitive materials, achieving faster curing and improved compatibility without significant heating of adjacent components.
Implementation Method 1
emitting an amount of light from a first light source having one or more light source operational parameters, which impinges on at least a portion of the deposited curable material for initiating curing of the curable material
Implementation Method 2
monitoring the reflectivity of the curable silver ink as the portion of the curable silver ink transitions from the uncured state to a cured state
Data Source
AI summary
Systems are provided for curing a deposited curable material film using a light source and feedback system for monitoring the degree of curing using detected optical properties of the film. Operational parameters of the light source (e.g., power) are adjusted by a control system in response to the detected optical properties of the film. In certain embodiments, the curing system includes at least one light source in optical communication with an uncured material, a detector for monitoring an optical property of the curing material, and a feedback system for controlling the light emitted from the light source in response to the detector.