Near-Infrared Printed Codes for Stable Invisible Information Reading
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Solution Overview
Problem
Existing techniques for embedding invisible information using near infrared ray absorbing materials face challenges in stable recognition, particularly in ensuring that the information remains undetectable to humans and can be reliably read.
Innovation Solution
A printed material is designed with a near infrared ray absorbing layer and a code shape that outputs code information as reflected light upon irradiation, where the ratio of transmittance values in specific wavelength ranges is optimized to enhance visibility only under near infrared light, using a ratio R=X2/X1 of 0.09 or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a near infrared ray absorbing material is used to embed invisible information on a printed material, then the security and invisibility of the information are improved, but the stability and reliability of recognizing the information are insufficient
Solution Approach 1:
The patent applies parameter changes by establishing a specific transmittance ratio parameter (R = X2/X1 ≥ 0.09) for the near infrared ray absorbing material. This quantitative parameter control ensures that the material absorbs near infrared rays effectively while maintaining visibility characteristics, thereby stabilizing the recognition of invisible information under varying irradiation conditions.
Solution Approach 2:
The patent employs composite materials by combining the near infrared ray absorbing material with a shielding layer that has specific transmittance characteristics. This composite structure creates a system where the shielding layer compensates for the insufficient recognition stability of the absorbing material alone, enabling reliable detection of the embedded code information.
2Reliability
If the transmittance of visible light is reduced to enhance invisibility, then the security is improved, but the recognition stability under near infrared irradiation deteriorates
Solution Approach 1:
The patent uses parameter changes by defining the transmittance ratio R = X2/X1 ≥ 0.09, where X2 represents the integral transmittance in the near infrared region and X1 represents the integral transmittance in the visible region. This parameter ensures that the material maintains low visible light transmittance for invisibility while preserving sufficient near infrared transmittance for stable recognition.
Solution Approach 2:
The shielding layer acts as an intermediary element that mediates between the near infrared ray absorbing material and the detection system. It has transmittance characteristics that allow it to pass near infrared rays while blocking visible light, thereby enabling recognition precision without compromising invisibility and security.
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 stable and reliable recognition of invisible information on printed materials, maintaining confidentiality and high print quality while allowing information to be read using near infrared rays.
Implementation Method 1
a near infrared ray absorbing layer that is provided on the base substance and contains a near infrared ray absorbing material, and a code shape that is formed in a predetermined shape by the near infrared ray absorbing layer
Data Source
AI summary
A printed material (100) has a base substance (1), an absorption part (22) (a near infrared ray absorbing layer (3)) that is provided on the base substance (1) to contain a near infrared ray absorbing material, and a code shape (20) that is formed in a predetermined shape from the absorption part (22) or by covering a part of the absorption part (22) and that outputs code information (CI), upon irradiation with light of near infrared rays, as reflected light of the light of near infrared rays, where in the near infrared ray absorbing material, in a case where an integral value of transmittance of visible light at 400 nm to 750 nm is denoted as a first integral value X1, and an integral value of transmittance in a 20 nm width that is centered on a predetermined wavelength λ of the light of near infrared rays is denoted as a second integral value X2, a ratio R=X2/X1 between the second integral value X2 and the first integral value X1 is 0.09 or more.