Thermal Printer Strobe Pulse Control for Heat Distortion
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Solution Overview
Problem
Thermal printers face challenges in achieving high-speed, high-quality printing without distortions due to heat accumulation in heating elements, which affects the size and quality of printed dots, especially when using low-cost controllers that struggle with processing power for printer control and print quality improvement.
Innovation Solution
A thermal printer design where a processor controls the thermal head by applying a predetermined voltage in synchronization with strobe pulses, with varying strobe widths to prevent heat accumulation, ensuring consistent dot sizes and improved print quality, even with low-cost CPUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If heating elements are heated for the same time intervals when printing upper dots and lower dots, then printing speed is maintained, but heat accumulation causes temperature rise and distorted characters reducing print quality
Solution Approach 1:
The patent applies periodic action by alternating between long and short strobe pulse widths in a repeating pattern. Specifically, odd-numbered heating elements use a first strobe pulse width while even-numbered heating elements use a second strobe pulse width, creating a periodic heating pattern that prevents continuous heat accumulation in any single heating element, thereby maintaining both printing speed and print quality
Solution Approach 2:
The patent implements local quality by assigning different strobe pulse widths to different heating elements based on their position. Heating elements at odd positions receive longer pulse widths while those at even positions receive shorter pulse widths, creating localized variations in heating intensity that distribute heat accumulation across different spatial locations, preventing overall temperature rise and distortion
2Productivity
If total printing time exceeds total excitation time for speed increase, then printing speed can be increased, but low-cost controllers consume most processing power on printer control leaving insufficient power for quality improvement processes
Solution Approach 1:
The patent applies self-service by implementing a deterministic control algorithm that automatically manages heating element activation without requiring complex real-time calculations. The controller simply follows a pre-defined pattern of alternating strobe pulse widths, eliminating the need for sophisticated processing to calculate optimal heating parameters, thereby freeing up controller resources while maintaining both speed and quality
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 enables high-speed, high-quality printing by maintaining consistent dot sizes and preventing heat-related distortions, effectively addressing the limitations of existing thermal printer technologies.
Implementation Method 1
a plurality of heating elements are arranged in a line... causing a predetermined voltage to be applied to the thermal head... in order to print the printing data
Data Source
AI summary
A thermal printer includes a thermal head in which a plurality of heating elements are arranged in a line, and a processor that executes a printing process of energizing the thermal head successively a predetermined number of times so at to print a printing data by causing a predetermined voltage to be applied to the thermal head the predetermined number of times in accordance with and in synchronization with strobe pulses in a strobe signal, a strobe width of each strobe pulse in the strobe signal defining a duration during which the thermal head is being applied with the predetermined voltage, wherein among the strobe pulses for the predetermined number of times of energizing the thermal head, a strobe width of at least one predetermined strobe pulse is set to be always shorter than a strobe width of another predetermined one of the strobe pulses.