Transparent Ink Contrast via Density Holes
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Solution Overview
Problem
Current methods for detecting and viewing clear ink drops in inkjet printing systems are inadequate, as they rely on complex and expensive hardware, and fail to provide sufficient contrast for accurate alignment and placement analysis.
Innovation Solution
A method involving the use of a first ink with a specific color density and a second ink with a different color density, where the second ink drops displace the first ink to create density holes, allowing the clear ink diagnostic image to be rendered visible by contrast, enabling visualization without costly equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If clear ink is used for printing, then ink transparency is improved, but visibility of ink drops for detection and alignment analysis deteriorates
Solution Approach 1:
A colored background layer is introduced as an intermediary between the substrate and the clear ink. This background layer provides contrast that enables visualization of clear ink drop placement without altering the clear ink's transparency or requiring special detection equipment.
Solution Approach 2:
The solution involves creating a color contrast by printing a colored background layer and then depositing clear ink on top. The visibility of the clear ink is achieved through the color difference between the background layer and the clear ink, allowing detection without changing the clear ink's fundamental transparency property.
2Measurement precision
If special substrates or expensive test equipment are used for detecting clear ink, then detection accuracy is improved, but system complexity and cost increase
Solution Approach 1:
The printing system itself generates the detection mechanism by printing a colored background layer that serves as its own test pattern. The clear ink drops are detected through the contrast they create against this self-generated background, eliminating the need for external test equipment or specialized substrates.
Solution Approach 2:
The detection function is extracted from external specialized equipment and integrated into the printing process itself. The colored background layer acts as a built-in reference that enables detection using standard imaging capabilities, removing the need for separate expensive test equipment.
3Ease of operation
If clear ink drops are printed without contrast enhancement, then printing process simplicity is maintained, but alignment and registration accuracy deteriorates
Solution Approach 1:
A colored background layer is printed in advance at the location where clear ink will be deposited. This preliminary action creates the contrast necessary for accurate alignment and registration analysis, enabling precise measurement of clear ink drop placement without complicating the subsequent clear ink printing step.
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 allows for the effective detection and visualization of clear ink drop placement, facilitating accurate alignment and registration of print heads without the need for expensive hardware, enhancing operational efficiency and image quality.
Implementation Method 1
the second ink drops hit and displace the first ink creating density holes which provide a density contrast
Implementation Method 2
curing or drying after forming the second ink diagnostic image
Data Source
AI summary
A method for printing including disposing a first ink onto a substrate to form a first ink layer on the substrate in an area where a diagnostic image will be printed; disposing a second ink onto the first ink layer to form a second ink diagnostic image, wherein the first ink has a first color density and the second ink has a second color density that is different from the first ink color density, wherein the second ink drops hit and displace areas of the first ink layer creating holes which provide a density contrast; curing or drying after forming the second ink diagnostic image; wherein the second ink diagnostic image is rendered visible by the contrast between the second ink diagnostic image and the substrate as compared to the first ink layer and the substrate.