Thermal Printer Density Control via Feedback Adjustment
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Solution Overview
Problem
Thermal printers face challenges in maintaining consistent printing density due to varying characteristics of papers, such as differences in temperature, humidity, and storage conditions, which can result in deviations from a predetermined range.
Innovation Solution
A thermal printer system comprising a first and second thermal head, sensors, and a control section that adjusts the printing density by applying a strobe signal to the heat generating elements based on detected density levels, ensuring the printing density falls within a predetermined range through an adjustment processing algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a thermal printer uses a fixed strobe signal for printing, then the device complexity is reduced, but the printing density varies due to different paper characteristics and storage conditions
Solution Approach 1:
The control section dynamically adjusts the strobe signal parameters (duty cycle, pulse width) based on detected printing density to compensate for variations in paper characteristics and storage conditions, maintaining consistent printing quality without complex hardware modifications
Solution Approach 2:
The system implements a feedback mechanism where the printing density is detected by a sensor, compared against target values, and the strobe signal is adjusted accordingly to maintain printing density within the predetermined range, resolving the contradiction between simple control and precise output
2Adaptability or versatility
If the thermal printer supports various types of papers with different characteristics, then the adaptability is improved, but the printing density consistency deteriorates due to varying paper properties
Solution Approach 1:
The thermal printer automatically detects paper characteristics and adjusts printing parameters without requiring user input or manual calibration, enabling the system to adapt to different paper types while maintaining consistent printing density through self-adjustment
Solution Approach 2:
The system dynamically adjusts printing parameters based on real-time detection of paper characteristics and storage conditions, allowing the thermal printer to adapt to various paper types and environmental factors while maintaining printing density consistency
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 system effectively adjusts and maintains printing density within a predetermined range for both thermal heads, reducing variations and ensuring consistent output regardless of paper characteristics, without requiring user adjustments or additional hardware.
Implementation Method 1
A thermal printer prints on a paper including a heat-sensitive layer by heat generated by each of a plurality of heat generating elements which constitutes a thermal head
Data Source
AI summary
In accordance with an embodiment, a thermal printer comprises a first thermal head, a first sensor and a control section. The first thermal head prints a first mark on a first surface of an image receiving medium. The first sensor detects a printing density of the first mark. The control section determines whether or not the printing density of the first mark is in a predetermined range, and adjusts the printing density by the first thermal head in the predetermined range in response to determining that the printing density of the first mark is out of the predetermined range.