Emissive Information Code Coating for Invisible-Light Readability
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Solution Overview
Problem
Existing transparent two-dimensional codes require special infrared light readers, limiting their convenience for reading and application.
Innovation Solution
A method for forming an information code using an emissive layer with a reactive paint that emits light in response to invisible light, where the emissive performance of dark areas is reduced compared to light areas through laser irradiation, allowing visibility with normal light and invisible light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a transparent two-dimensional code using transparent toner with infrared light absorption properties is used, then the code can be made invisible to the naked eye and confidential, but it requires special infrared light readers which limits convenience
Solution Approach 1:
The patent applies local quality by creating different emissive properties in different areas of the code. The code contains both light-emitting areas (with phosphor materials) and dark areas (without phosphor or with different phosphor), allowing the code to be readable by ordinary cameras while maintaining confidentiality through selective visibility
Solution Approach 2:
The patent utilizes color changes by employing phosphor materials that emit visible light when excited by invisible light. The code areas with phosphor emit light of specific wavelengths, creating visible contrast against non-emitting areas, enabling reading with standard devices while preserving security
2Ease of operation
If the emissive performance of dark areas is reduced through laser irradiation, then the code becomes readable with normal light and invisible light, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-forming the emissive layer with phosphor materials in specific patterns before final code formation. The laser irradiation step selectively modifies areas to create the code pattern, simplifying the overall process by preparing materials in advance for precise placement
Solution Approach 2:
The patent replaces mechanical printing or physical marking methods with laser irradiation to create the code pattern. The laser selectively alters the emissive properties of the coating material without physical contact, reducing manufacturing complexity compared to traditional mechanical coding methods
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
Enables reading of the information code without a special reader, ensuring convenience and confidentiality, with improved durability and readability under invisible light.
Implementation Method 1
a reactive paint that emits light in response to an invisible light
Implementation Method 2
irradiating a portion of the emissive layer corresponding to the dark area with laser light
Data Source
AI summary
A code formation method for forming an information code on a target object is provided. The information code stores information with an array of a light area and a dark area. The code formation method includes forming an emissive layer by applying, to the target object, a coating material containing a reactive paint that emits light in response to invisible light, and irradiating a portion of the emissive layer corresponding to the dark area with laser light to reduce an emissive performance of the dark area to be lower than an emissive performance of the light area. The irradiating with the laser light includes irradiating with the laser light to make a transmittance for the invisible light in the portion corresponding to the dark area higher than a transmittance for the invisible light in a portion of the emissive layer corresponding to the light area.