Laser Coloring Layer Heat Insulation for Hologram Integrity
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Solution Overview
Problem
Conventional information storage media with an infrared absorbing layer below a hologram layer suffer from damage due to heat generated by laser irradiation, limiting the intensity of the laser beam and thus the printing quality.
Innovation Solution
Incorporating a lower transparent layer between the laser coloring layer and the functional film layer, which acts as a heat insulator, allowing for a more intense laser beam to be used without damaging the functional film layer, and providing a heat sealing layer to prevent separation and enhance thermal compression bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laser beam is used to color the infrared absorbing layer, then information can be stored, but the hologram layer is damaged by heat generated by laser irradiation
Solution Approach 1:
A transparent layer having heat resistance is introduced as an intermediary between the infrared absorbing layer and the hologram layer. This transparent layer acts as a heat barrier that blocks heat generated by laser irradiation of the infrared absorbing layer from reaching and damaging the hologram layer, while still allowing the laser beam to pass through to color the infrared absorbing layer.
Solution Approach 2:
The laminate body is segmented into distinct functional layers: the infrared absorbing layer for information storage, the heat-resistant transparent layer as a thermal barrier, and the hologram layer for security functions. This segmentation allows each layer to perform its specific function without interfering with or damaging other layers.
2Manufacturing precision
If the intensity of the laser beam is restricted to a low level, then the hologram layer is protected from damage, but the printing quality is limited
Solution Approach 1:
The heat-resistant transparent layer serves as a protective intermediary that enables the use of high-intensity laser beams by absorbing or blocking the heat before it reaches the hologram layer. This allows the laser beam to be intensified for better printing quality without causing damage to the functional film layer.
Solution Approach 2:
The introduction of the heat-resistant transparent layer changes the thermal parameters of the laminate structure, specifically increasing the heat resistance in the region between the infrared absorbing layer and the hologram layer. This parameter change allows for higher laser beam intensity to be applied without exceeding the damage threshold of the hologram layer.
3Ease of manufacture
If the functional film layer is made smaller, then cost is reduced, but coverage area is limited
Solution Approach 1:
The heat-resistant transparent layer provides uniform thermal protection across the entire area where laser printing is performed, allowing the functional film layer to be minimized only in regions where it is actually needed for security functions. This local quality approach enables cost reduction by reducing the area of the expensive functional film layer while maintaining adequate protection where required.
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 improves the printing quality by preventing damage to the functional film layer, enabling more intense laser irradiation, reducing costs by minimizing the functional film layer size, and enhancing anti-counterfeiting capabilities by ensuring the film layer remains intact.
Implementation Method 1
The lower transparent layer can thus suppress transfer of heat generated by the laser irradiation from the laser coloring layer to the functional film layer, thereby suppressing damage to the functional film layer.
Implementation Method 2
a laser beam passes through the upper transparent layer, the functional film layer, and the lower transparent layer, to thereby color the laser coloring layer
Implementation Method 3
an infrared absorbing layer lower than a hologram layer, the infrared absorbing layer being irradiated with a laser beam having passed through the hologram layer, to thereby color the infrared absorbing layer
Implementation Method 4
Since the functional film layer is provided with a heat sealing layer at least on any one of a side of the upper transparent layer and a side of the lower transparent layer, an effect of thermal compression bonding can be improved and separation can be prevented between the functional film layer and any one of the upper transparent layer and the lower transparent layer.
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3
AI summary
To provide an information storage medium and a method for printing on the information storage medium that can improve a quality of printing on a laser coloring layer in a lower than a functional film layer. A card (1) includes: a base material (11); a laser coloring layer (12) that is laminated upper (Z2) than the base material (11) and produces color by laser irradiation; a transparent layer (13) that is laminated upper (Z2) than the laser coloring layer (12) and is translucent; a Lippmann hologram layer (14) that is laminated upper (Z2) than the transparent layer (13) and is translucent; and a transparent layer (15) that is laminated upper than the Lippmann hologram layer and is translucent.