Identification Medium with Direct Thermal and Excitable Layers

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Solution Overview

Problem

Existing identification media face interference issues between radiation-emitted light from the medium and excitable indicia, and direct thermal layers are often soluble in excitable inks, compromising the readability and durability of visible and excitable indicia.

Innovation Solution

An identification medium with a substrate and printable layer optimized to reduce background radiation intensity, featuring a direct thermal layer insoluble in excitable ink, and a clear cover layer or spectral distribution differences to maintain a high signal-to-noise ratio, allowing for clear reading of excitable indicia without interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the substrate and printable layer contain optical brighteners to enhance visible indicia display, then the visible indicia readability is improved, but the background radiation intensity increases and interferes with excitable indicia scanning

Engineering Contradiction:

Improvevisible indicia brightnessVSAvoidbackground radiation interference

Core Design Contradiction:

Illumination intensityVSObject-generated harmful factors

Solution Approach 1:

The patent removes or reduces optical brighteners from the substrate and printable layer to eliminate the source of background radiation interference. This extraction of the harmful component (optical brighteners) allows the excitable indicia to be scanned without interference from background fluorescence, while the visible indicia remain readable through alternative means such as direct thermal printing or reflective printing methods.

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of manufacture

If a direct thermal layer is used to display visible indicia, then the visible indicia can be printed directly on the medium, but the direct thermal layer is soluble in excitable inks causing damage to the visible indicia

Engineering Contradiction:

Improvedirect thermal printing capabilityVSAvoidvisible indicia durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent employs composite material structures where the direct thermal layer is combined with insoluble additives or protective coatings that prevent dissolution in excitable inks. This composite approach maintains the direct thermal printing capability while adding resistance to ink solubility, ensuring both visible indicia durability and the ability to apply excitable ink overlays without damage.

Inventive Principle:

Principle #40Composite materials

3Adaptability or versatility

If the excitable ink is applied over the printable layer, then the excitable indicia can be displayed, but the ink solubility causes the excitable ink to dissolve the direct thermal layer

Engineering Contradiction:

Improvedual indicia display capabilityVSAvoidlayer structural integrity

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent introduces an intermediary protective layer between the direct thermal layer and the excitable ink. This intermediate barrier prevents direct contact and dissolution between the ink and the thermal layer, while still allowing the excitable indicia to be displayed effectively. The mediator layer maintains structural integrity of both components while enabling their coexistence.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Illumination intensity

If the substrate emits light when exposed to directed radiation, then the substrate provides background illumination, but this light emission interferes with the scanner's ability to read the excitable indicia

Engineering Contradiction:

Improvebackground illuminationVSAvoidexcitable indicia readability

Core Design Contradiction:

Illumination intensityVSMeasurement precision

Solution Approach 1:

The patent converts the harmful background light emission into a beneficial feature by using radiation-absorbing materials or spectral filtering approaches. The substrate is designed to absorb the directed radiation rather than re-emit it, thereby eliminating interference with excitable indicia scanning. This approach transforms the problematic light emission into a neutral or beneficial radiation absorption characteristic that improves measurement precision.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 reliable scanning of excitable indicia with reduced background interference and ensures the durability of visible indicia by preventing ink solubility, enhancing the functionality of identification media in various applications.

Implementation Method 1

The excitable ink exhibits luminescence when it is exposed to directed radiation

Methodology Applied

Scientific EffectLuminescence: Luminescence

Implementation Method 2

The substrate and/or printable layer preferably has a density of optical brighteners below a predetermined threshold to reduce an intensity of background radiation emitted by the substrate and/or printable layer

Methodology Applied

Scientific EffectAbsorption of electromagnetic radiation: Absorption (EM radiation)

Data Source

PatentUS9275559B2Identification medium configured for displaying visible and excitable indicia

Publication Date: 2016.03.01 PRECISION DYNAMICS CORP

AI summary

An identification medium is optimized for displaying visible and excitable indicia. The medium includes a substrate having a color change layer, such as a direct thermal layer, and a patterned excitable layer placed over the color change layer. The color change layer produces the visible indicia. The excitable layer produces the excitable indicia. The excitable indicia is not easily readable under ambient light but becomes more easily readable under directed radiation, i.e., UV or IR light.