2D Barcode Overlay for Environmental Exposure Readability
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Solution Overview
Problem
Existing environmental exposure indicators combined with bar codes face challenges in being read due to obscuration by the bar code and require modifications to packaging processes, making it difficult to convey both static and dynamic data simultaneously without altering existing label and packaging production.
Innovation Solution
A 2D bar code with an overlay containing an environmental exposure indicator material that transitions in response to environmental stimuli, allowing dynamic data to be added post-manufacture without altering packaging processes, and using error correction to ensure readability of static data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If an environmental exposure indicator is combined with a bar code symbol, then dynamic environmental data can be conveyed, but the bar code becomes obscured and difficult to read
Solution Approach 1:
The patent applies dimensionality change by transitioning from traditional 1D bar codes to 2D bar code symbols. This allows the environmental indicator to be positioned in the quiet space surrounding the 2D symbol without obscuring the data-encoding portion. The 2D format enables environmental indicators to be integrated in the peripheral regions while maintaining full readability of the encoded information.
Solution Approach 2:
The patent segments the label into distinct functional zones: the 2D bar code symbol area for data encoding, quiet spaces for separation, and environmental indicator regions positioned in the quiet spaces or surrounding areas. This segmentation allows both the bar code and environmental indicator to fulfill their functions simultaneously without mutual interference.
2Loss of information
If environmental indicators are printed on label stock with bar codes, then both data types can be conveyed, but modifications to packaging processes are required
Solution Approach 1:
The patent employs multi-functionality by using the quiet spaces of the 2D bar code symbol to serve dual purposes: maintaining the integrity of the bar code reading while simultaneously providing designated areas for environmental indicators. This eliminates the need for separate integration processes, as the same label structure accommodates both functions.
Solution Approach 2:
The patent uses optical copying principles where the environmental indicator in the quiet space does not need to be physically integrated with the bar code symbol itself. The indicator can be applied separately through printing or other methods, and the 2D bar code reader can still accurately capture the symbol data without being interfered with by the environmental indicator in the surrounding quiet space.
3Reliability
If an overlay covers the bar code symbol to protect it, then the bar code is protected from damage, but the bar code becomes unreadable
Solution Approach 1:
The patent applies local quality by positioning environmental indicators specifically in the quiet spaces surrounding the 2D bar code symbol, rather than covering the entire symbol. The quiet spaces serve as localized regions that can accommodate indicators without affecting the data-encoding modules. This selective positioning ensures protection and visibility while maintaining full readability of the bar code data.
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 simultaneous reading of static and dynamic data from bar codes without modifying packaging processes, ensuring accurate data retrieval through error correction, even when the indicator changes state.
Implementation Method 1
Certain types of thermochromic materials, often referred to as memory thermochromic materials, exhibit semi-irreversible color changes in response to changing temperature.
Implementation Method 2
These materials exhibit a color changing hysteresis effect, changing to a high temperature color state when heated above a high temperature threshold, with the color state being maintained when the material returns to a temperature below that threshold.
Data Source
AI summary
An apparatus, system, and method for adding an overlay to a bar code symbol is disclosed. The bar code symbol is affixed to a perishable host product. The overlay includes a transparent substrate and an environmental exposure indicator material which is responsive to an environmental stimulus. When the overlay is affixed to the bar code symbol, both static and dynamic data regarding the perishable host product can be determined.