Dual-Sided Thermal Printing with Variable Energy Heat Pulses

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Solution Overview

Problem

Existing dual-sided direct thermal printing technologies face issues with uneven print density due to simultaneous heat application on both sides of thermal printing paper, which can lead to optical distractions and suboptimal printing results.

Innovation Solution

The use of thermal print heads disposed on opposite sides of the feed path, applying variable energy heat pulses to achieve dual-sided printing, with specific energy levels and timing diagrams to ensure balanced and controlled heat application on both sides of the thermal imaging element.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If simultaneous heat application on both sides of thermal printing paper is used for dual-sided printing, then printing efficiency is improved, but print density uniformity deteriorates

Engineering Contradiction:

Improveprinting efficiencyVSAvoidprint density uniformity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies different energy levels to different sides of the thermal printing paper. The first print head applies a first energy level to the first side, while the second print head applies a second energy level to the second side. This local differentiation of energy application ensures that each side receives appropriate heat treatment, preventing optical distractions and achieving uniform print density across both sides while maintaining simultaneous printing efficiency.

Inventive Principle:

Principle #3Local quality

2Device complexity

If equal energy levels are applied from both print heads, then device simplicity is maintained, but print quality deteriorates due to optical distractions

Engineering Contradiction:

Improvecontrol system simplicityVSAvoidprint quality

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent changes the energy level parameter applied by each print head based on the specific printing requirements. The controller is configured to apply a first energy level from the first print head and a second energy level from the second print head, where these energy levels can be independently adjusted. This parameter differentiation eliminates optical distractions and ensures high-quality print output on both sides of the paper.

Inventive Principle:

Principle #35Parameter changes

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 allows for precise control over print density on both sides of the thermal imaging element, preventing optical distractions and ensuring high-quality dual-sided printing by adjusting energy levels and timing of heat pulses from opposing print heads.

Implementation Method 1

a print head selectively applies heat to paper or other sheet media comprising a substrate with a thermally sensitive coating. The coating changes color when heat is applied

Methodology Applied

Scientific EffectThermal energy transfer: Conduction (thermal)

Implementation Method 2

The coating changes color when heat is applied, by which 'printing' is provided on the coated substrate

Methodology Applied

Scientific EffectThermochromism: Thermochromism

Data Source

PatentUS7589752B2Two-sided thermal printing

Publication Date: 2009.09.15 ICONEX LLC

AI summary

Dual-sided direct thermal printing of a thermal imaging element having thermally sensitive coatings on opposite sides of a substrate is described, where the thermal imaging element is provided along a feed path of a thermal printer having print heads disposed on opposite sides of the feed path. Printing on both sides of the thermal imaging element is achieved by applying variable energy heat pulses from the opposed print heads.