Thermal Printer Head Control for Density Uniformity
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Solution Overview
Problem
Existing thermal printers face issues with non-uniform printing density due to inconsistent pressure exerted on the printing platen by the printing head, which cannot be effectively addressed by existing printing energy compensation methods.
Innovation Solution
A control method and system that adjust the output energy of heating units in a thermal printer by processing dot matrix data to compensate for non-uniform pressure, ensuring consistent printing density through controlled strobe signals and energy distribution across the printing head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If printing energy compensation is implemented by regulating the duration of a valid strobe signal applied to all heating units, then the overall printing density of the printing dot line is improved, but the problem of non-uniform printing density of each printing dot caused by non-uniform pressure cannot be solved
Solution Approach 1:
The patent segments the heating units into multiple groups based on their positional characteristics and pressure distribution patterns. Each group is controlled independently with group-specific compensation parameters, allowing targeted correction of non-uniform pressure effects in different regions of the printing head without requiring individual control of every heating unit.
Solution Approach 2:
The patent implements local quality by applying different compensation strategies to different groups of heating units. Each group receives customized compensation parameters (such as different strobe signal durations or energy adjustment factors) tailored to its specific pressure conditions, rather than applying a uniform compensation approach across all heating units.
2Manufacturing precision
If the duration of strobe signal is extended to compensate for insufficient printing energy in certain regions, then printing density in those regions is improved, but printing energy waste increases in regions where sufficient energy is already provided
Solution Approach 1:
The patent applies local quality by assigning different strobe signal durations and energy compensation parameters to different groups of heating units based on their specific needs. Heating units in regions with insufficient pressure receive extended strobe signals for additional energy, while heating units in regions with adequate pressure use standard parameters, thereby avoiding energy waste in over-compensated areas.
Solution Approach 2:
The patent implements partial action by providing compensation only to the extent needed for each heating unit group. Instead of uniformly extending the strobe signal duration across all heating units, the system applies extended duration only to groups that require additional energy, achieving the minimum necessary compensation without excessive energy consumption in other regions.
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
The solution effectively improves the uniformity of printing density by continuing to output compensatory energy after basic printing energy, addressing the issue of non-uniform pressure and resulting 'white spots' in thermal printing.
Implementation Method 1
the heating units are controlled to emit heat, thereby produce energy (called printing energy for short), and the printing energy is transferred to the printing supplies contacting with the thermal printing head
Data Source
AI summary
A control method for printer, the control method includes: controlling a first group of heating units of a printing head to output first printing energy to form printing dots with a first density on a printing medium; and controlling a second group of heating units of the printing head to continue outputting second printing energy to form printing dots with a second density on the printing medium, wherein the second group of heating units consists of heating units need to implement printing energy compensation in the first group of heating units. By means of the control method, the printing densities of the printing dots corresponding to the heating units need to implement printing energy compensation are improved, and the problem of non-uniform printing density of each printing dot caused by non-uniform pressure exerted on the printing platen by the printing head can be effectively solved.