Multi-thermal head unit for structural color printing
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Solution Overview
Problem
The production of personal information media, such as ID cards, requires a transfer ribbon with a microstructure like a diffraction grating, leading to higher unit costs due to wasteful usage, especially when producing large quantities, as a significant amount of ribbon is consumed even for small wastage in each card.
Innovation Solution
A head unit with multiple thermal heads arranged to correspond to each medium region on a media sheet, allowing for the use of a ribbon of smaller width, reducing wastage between regions and enabling efficient production of multiple personal information media from a single sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one thermal head performs printing collectively in multiple medium regions, then device complexity is reduced, but ribbon usage increases due to wasteful consumption between regions
Solution Approach 1:
The patent divides a single thermal head into multiple separate thermal heads, with each thermal head corresponding to one medium region. This segmentation allows each thermal head to print only in its designated region, eliminating wasteful ribbon consumption in areas between medium regions while maintaining manageable device complexity through modular architecture
2Area of stationary object
If a ribbon of larger width is used to cover all medium regions, then printing coverage is improved, but ribbon cost increases
Solution Approach 1:
The patent assigns different width specifications to ribbons based on their intended use regions. Each thermal head uses a ribbon width precisely matched to its corresponding medium region width, rather than using a single large-width ribbon for all regions. This local optimization reduces overall ribbon consumption while ensuring adequate coverage for each printing area
3Loss of substance
If multiple thermal heads are arranged to correspond to each medium region, then ribbon usage efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the printing system into multiple independent thermal head units, each handling one medium region. While this increases the number of components, each segment is simple and standardized, making the overall system manageable through modular design principles
Solution Approach 2:
The patent arranges multiple thermal heads in a spatial distribution that corresponds to the arrangement of medium regions on the media sheet. By organizing thermal heads along the width dimension to match the medium region layout, the system achieves efficient ribbon usage without excessive complexity in the control architecture
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 configuration significantly reduces the usage of transfer ribbon, enhances anti-counterfeiting capabilities by effectively printing facial images, and increases the number of sheets printable per unit time while preventing sheet damage.
Implementation Method 1
a plurality of thermal heads configured to thermally transfer a dot exhibiting a structural color from a ribbon to a target
Implementation Method 2
the resistive heating elements can be suppressed from contacting a transfer target sheet outside the ribbon
Data Source
AI summary
A head unit is used for production of a media sheet that has a medium region row including a plurality of medium regions, the medium regions being to be separate personal information media. The head unit includes a plurality of thermal heads configured to thermally transfer dots exhibiting a structural color from a ribbon to a target. The plurality of thermal heads are arranged so that each thermal head corresponds to a respective one of the medium regions constituting the medium region row.