Thermal Reveal Substrate for Print Head Alignment
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Solution Overview
Problem
Current printing technologies face challenges in accurately aligning print heads with substrates, particularly in thermal printing, where precise alignment is necessary to reveal hidden color patterns, leading to inefficiencies and inaccuracies in color imaging.
Innovation Solution
A system utilizing a heat- and pressure-activated opaque polymer substrate with a color matrix that becomes transparent upon activation, allowing for precise alignment and registration of print heads with optical sensors and software to adjust firing configurations based on revealed image dots, ensuring accurate color imaging and re-registration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If thermal printing is used to reveal hidden color patterns, then color imaging capability is improved, but alignment precision between print head and substrate deteriorates
Solution Approach 1:
The substrate is pre-patterned with a color matrix of hidden color blocks before printing. This preliminary preparation allows the print head to simply reveal the predetermined color pattern by selective heating, eliminating the need for complex real-time color mixing and improving both color imaging capability and alignment precision
Solution Approach 2:
The invention uses a pre-defined color matrix pattern that is copied onto the substrate through thermal revelation. The print head acts as a template that reveals the hidden color pattern beneath, ensuring precise reproduction of the intended color image without requiring complex alignment during the printing process
2Measurement precision
If precise alignment is required for thermal printing, then color imaging accuracy is improved, but system complexity increases
Solution Approach 1:
The substrate itself provides the alignment reference through its pre-patterned color matrix. The hidden color blocks are arranged in a known pattern that serves as a built-in registration system, allowing the print head to automatically align with the substrate without requiring external alignment mechanisms or complex control systems
Solution Approach 2:
The invention utilizes the color change property of the thermochromic material in the hidden color blocks. When heated, these blocks change color or become transparent, revealing the underlying color pattern. This color change mechanism provides visual feedback for alignment verification and ensures accurate color imaging without adding system complexity
3Ease of operation
If traditional printing methods are used, then process simplicity is maintained, but color accuracy and registration deteriorate
Solution Approach 1:
The color matrix is pre-formed on the substrate before the printing process. This preliminary preparation of the color pattern eliminates the need for complex multi-pass printing or color mixing operations, maintaining process simplicity while ensuring accurate color registration through the pre-aligned color blocks
Solution Approach 2:
The invention replaces complex mechanical alignment systems with a thermal field approach. Instead of physically positioning and aligning multiple print heads or layers, the system uses selective thermal heating to reveal the pre-positioned color matrix, achieving accurate color registration through thermal control rather than mechanical precision
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 solution enables improved alignment and registration of print heads with substrates, enhancing the accuracy and efficiency of thermal printing by revealing hidden color patterns and allowing for precise control over color combinations, thereby improving overall color imaging quality.
Implementation Method 1
an opaque polymer sensitive to application of one of heat and pressure which upon one of being heated to a predetermined temperature and subjected to a predetermined pressure causes the opaque polymer to become transparent
Data Source
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Figure 3A~3B
AI summary
Systems and method provide a reveal substrate having a) an opaque polymer sensitive to at least one first application of at least one selected from heat, pressure and light, said opaque polymer becoming transparent upon being subjected to the at least one first application, and b) a bottom substrate layer having one or more colored areas on a top surface thereof, said bottom substrate layer being disposed such that the one or more colored areas are obscured by the opaque polymer prior to being subjected to the at least one first application and are revealed after at least one portion of the opaque polymer is subjected to the at least one first application.