Card Recording Medium Security Lines
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Solution Overview
Problem
Existing recording media face challenges in preventing falsification and ensuring easy authenticity determination, particularly when elaborate copies are made, as existing techniques either compromise on authenticity determination or require costly additional apparatus for reading additional information.
Innovation Solution
A recording medium with a color development layer laminated on a substrate, featuring lines that are optically identifiable on both the front and end faces, allowing for secure recording and verification without the need for additional reading apparatus, using a combination of thermosensitive layers and laser irradiation to control color development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional information is recorded by laser machining or fluorescent material printing to an image on the print face, then falsification resistance is improved, but when the print face is elaborately copied, the falsification preventing effect is lowered and authenticity determination becomes difficult
Solution Approach 1:
The patent extends the security lines from the front face into the thickness direction of the color development layer, creating a three-dimensional structure that is visible on both the front and end faces. This dimensional extension prevents elaborate copying because the copied image cannot replicate the depth and continuity of lines that physically penetrate through the card layer.
Solution Approach 2:
The security feature is divided into multiple segments: lines extending on the front face and corresponding lines visible on the end face. These segmented views must match for authenticity verification, creating a multi-point verification system that is difficult to replicate through simple copying.
2Reliability
If additional information is recorded by using another recording apparatus that performs recording other than optical recording, then falsification resistance is improved, but an apparatus for reading the additional information is required which incurs large operational cost and limits authenticity determination opportunities
Solution Approach 1:
The security lines are designed to be readable by multiple types of devices: optical verification systems can read the front face lines, while simple visual inspection can verify the end face lines. This multi-functional design eliminates the need for specialized reading apparatus, allowing authenticity determination at any location without expensive equipment.
Solution Approach 2:
The recording medium itself provides the verification capability through its physical structure. The lines extending through the color development layer serve as self-identifying features that can be verified by simple visual inspection or basic optical scanning, making the system self-sufficient without requiring external specialized reading apparatus.
3Ease of manufacture
If a simple structure is used for the recording medium, then manufacturing cost is reduced, but falsification prevention capability is weakened
Solution Approach 1:
The security lines are merged with the standard image recording process. Both the image data and security lines are recorded using the same laser machining apparatus and color development layer structure, combining authentication functionality with standard recording operations. This integration allows security features to be added without requiring separate manufacturing processes or additional structural components.
Data Source
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Figure 3(a)~3(d)
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AI summary
According to one embodiment, a recording medium is a recording medium in a card form. The recording medium includes a substrate, and a color development layer laminated on the substrate, and provided with a line for security that extends along a lamination surface of the substrate from an end face of the recording medium, such that presence or absence of the line for security is optically identifiable at the end face. It is thus provided a recording medium that can easily prevent falsification with a simple structure, and allows authenticity determination to be performed relatively easily.