Thermal Transfer Sheet Micropattern Legibility
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Solution Overview
Problem
The thermal fusion transfer technique struggles to print discernible micropatterns on a small scale, often resulting in transfer failure and illegible characters.
Innovation Solution
A thermal transfer printing method and device that utilize a thermal transfer sheet with a base member, a release layer containing a wavelength conversion material, and a thermally fusible ink layer. The method involves heating the thermal transfer sheet according to image data with a first pattern and a second pattern, where the second pattern is not heated, allowing for the transfer of the thermally fusible ink layer to a transfer-receiving body while maintaining the second pattern as non-luminous.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal fusion transfer technique is used to print micropatterns with size of about 1 mm, then high density and superior sharpness are achieved, but collapse of the printed character (transfer failure) occurs and the character is difficult to print in a legible state
Solution Approach 1:
The character pattern is divided into multiple dot elements (e.g., 3×3 or 4×4 dot matrix) to form each character. This segmentation allows the thermal head to transfer heat to discrete locations, preventing collapse while maintaining legibility through the collective arrangement of dots.
Solution Approach 2:
The patent applies different heating strategies to different regions: the thermal head heats specific dot positions within a character pattern while leaving other regions unheated. This localized heating approach enables precise control over ink transfer, ensuring character legibility without causing collapse.
2Manufacturing precision
If thermal head with resolution of 300 dpi is used, then printing of about 1 mm characters is theoretically possible, but actual printing results in collapse and illegible characters
Solution Approach 1:
Each character is constructed from a matrix of discrete dots (e.g., 3×3 or 4×4 arrangement). This segmentation transforms the continuous character form into discrete transferable units, enabling reliable printing with 300 dpi thermal heads while maintaining theoretical size precision.
Solution Approach 2:
The patent dynamically adjusts the heating pattern to match the dot matrix structure of each character. By activating only the specific dots that constitute the character pattern and leaving intervening regions unheated, the system achieves both size control and print quality.
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 enables the expression of discernible micropatterns using the thermal fusion transfer technique, enhancing the legibility and security of printed matter by creating patterns that are only visible under UV irradiation.
Implementation Method 1
a release layer disposed on the base member and containing a wavelength conversion material that emits visible light with excitation by invisible light
Implementation Method 2
by heating the thermal transfer sheet with a thermal head of a thermal transfer printer
Implementation Method 3
a thermal fusion transfer technique for forming an image by laying a thermal transfer sheet with a thermally fusible ink layer containing a thermally fusible ink and an image receiving sheet one above the other, and by heating the thermal transfer sheet with a thermal head of a thermal transfer printer, thus causing the thermally fusible ink layer to be transferred to the image receiving sheet
Data Source
AI summary
Micro characters are expressed by a thermal fusion transfer technique. In a printed matter manufacturing method, a printed matter is manufactured by heating a thermal transfer sheet in accordance with image data, the thermal transfer sheet including a base member, a release layer disposed on the base member and containing a wavelength conversion material that emits visible light with excitation by invisible light, and a thermally fusible ink layer disposed on the release layer, and by transferring the thermally fusible ink layer to a transfer-receiving body. In this method, the image data includes a first pattern and a second pattern. The second pattern is disposed on the first pattern and has a maximum width of a predetermined value or less.