Multi-color Direct Thermal Printing Control Data Method
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Solution Overview
Problem
Direct thermal printers with printheads capable of producing two different temperatures are complex and expensive, making multi-color direct thermal printing costly and inefficient.
Innovation Solution
A method for creating control data to operate a direct thermal printer using a printhead with electrically controllable heat sources arranged transversely to the paper path, selectively applying heat to form two colors by heating adjacent heat sources to different temperatures, allowing for two-color printing without the need for complex temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a printhead with thermocouples capable of producing two different temperatures is used, then multi-color printing is achieved, but device complexity and cost increase
Solution Approach 1:
The printhead is segmented into multiple independently controllable heat sources arranged transversely to the paper path. Each heat source can be selectively heated to different temperatures, allowing different colors to be printed in different regions without requiring a single complex thermocouple system.
Solution Approach 2:
The system dynamically controls the temperature of each heat source independently based on the required color output. The controller adjusts heating parameters in real-time, enabling flexible multi-color printing through dynamic temperature modulation rather than static thermocouple configurations.
2Adaptability or versatility
If a printhead with thermocouples producing two different temperatures is used, then two-color printing is achieved, but manufacturing cost increases
Solution Approach 1:
Multiple heat sources are used to perform multiple functions (printing different colors) within a single printhead assembly. This universal approach eliminates the need for separate printing systems and reduces overall manufacturing complexity compared to using specialized multi-temperature thermocouples.
Solution Approach 2:
The system achieves multi-color printing by changing the temperature parameter of standard heat sources rather than using specialized thermocouples. By modulating temperature parameters dynamically, the same hardware can produce multiple colors at lower manufacturing cost.
3Device complexity
If standard heat sources are used with selective heating, then device complexity is reduced, but printing speed may be affected
Solution Approach 1:
The controller pre-calculates and sequences the heating of different heat sources based on the required color pattern. By planning the heating sequence in advance, the system optimizes thermal response time and maintains high printing speed while using simpler standard heat sources.
Solution Approach 2:
The heating process uses periodic action with controlled heating cycles for each heat source. By rhythmically activating different heat sources in sequence, the system maintains continuous printing capability and high productivity while keeping individual heat source control simple.
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 method reduces the complexity and cost of multi-color direct thermal printing by using a simpler temperature control system, enabling efficient two-color printing on direct thermal printing paper with reduced operational expenses.
Implementation Method 1
Direct thermal printing papers discolor in different colors in response to different temperatures. For example, the direct thermal printing paper KLRB 46B from the company Kanzan is a paper that colors red at a temperature of 75° C. to 80° C. and colors black at a temperature of 95° C. to 105° C.
Data Source
AI summary
A direct thermal printer prints on direct thermal printing paper, which has a thermo-reactive layer that can form two colors. A first color is formed at a first temperature, and a second at a second temperature, higher than the first. A printhead of the printer has heat sources arranged transversely to a paper path. Image data of an original image having at least the first color and the second color may be received. Control data may be created for the direct thermal printer for two-color printing of a print image. The control data has a plurality of print lines, and causes, for each print line for each heat source, either heating of the heat source to a printing temperature or no heating of the respectively heat source.