Thermal Printer Head Resistance Management for Compact Power
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Solution Overview
Problem
Existing thermal printers in mobile devices face challenges in maintaining performance and compactness due to the need for high voltage supply, which is either costly and bulky when using multiple batteries or results in energy loss with voltage boosters, and cannot efficiently manage energy consumption in compact, modern payment terminals.
Innovation Solution
A method for managing thermal printers that measures and calculates the heating time based on the voltage and internal resistance of a single battery power source, accounting for effective and parasitic resistances of the thermal head, allowing for precise energy delivery and reducing waste, while using a low-resistance thermal print head powered by a single Li-ion battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two Li-ion batteries are connected in series to supply 8 volts, then the voltage required for thermal printer performance is achieved, but the device becomes more expensive, bulky, and complex to manage
Solution Approach 1:
The patent changes the resistance parameter of the thermal print head to a low resistance value (below 100 ohms), which allows the system to operate effectively with a single battery at lower voltage, eliminating the need for series-connected batteries or voltage boosters
Solution Approach 2:
Instead of increasing voltage to maintain printing speed (conventional approach), the patent inverts the approach by decreasing resistance to achieve the same heating effect with lower voltage and a single battery
2Power
If a voltage booster is used with a single battery to achieve 8 volts, then the required voltage is supplied, but energy loss increases and the device becomes bulkier and more expensive
Solution Approach 1:
The patent changes the resistance parameter of the thermal print head to a low resistance value, which allows direct voltage application from a single battery without energy loss through voltage conversion devices
Solution Approach 2:
The patent removes the voltage booster component from the system entirely by redesigning the thermal print head with low resistance, eliminating the source of energy loss and additional bulk
3Power
If two batteries are stacked in series to provide 8 volts, then printing performance is maintained, but the device size increases and space is consumed
Solution Approach 1:
The patent changes the resistance parameter to low resistance, enabling operation with a single battery and reducing the volume required for power supply components
Solution Approach 2:
The patent merges the power supply function into a single battery configuration, eliminating the need for multiple battery compartments and associated structural components
4Ease of manufacture
If manufacturing constraints cause resistance variation in print points, then production flexibility is maintained, but printing precision and energy calculation accuracy deteriorate
Solution Approach 1:
The patent changes the resistance parameter to a low value with a wide acceptable range (below 100 ohms), which accommodates manufacturing variations while maintaining functional performance
Solution Approach 2:
The patent applies individual resistance measurement and compensation for each print point or module, allowing local variations to be accounted for without affecting overall system performance
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 ensures efficient and precise heating of thermal printer heads, maintaining print quality and performance while reducing component bulk, cost, and energy consumption, making it suitable for compact, portable devices.
Implementation Method 1
A thermal printer includes a thermal print head made up of a series of heating points... Each heating point normally has a predetermined resistance value... the energy required (W) can be represented by the formula below: W = P × t = U2/R × t
Data Source
Figure 1a~1b
Figure 2a~3
Figure 4~5
AI summary
The invention relates to a method for managing the printing of data by a thermal printer (4) which includes a thermal printing head (44), said thermal head (44) including a plurality of points, each point having an effective resistance r d , said thermal printer (4) being powered by a power source. According to the invention, such a method includes the following steps: measuring (31) a voltage U supplied by said power source of said thermal printer; measuring (32) an internal resistance r u of said power source; and calculating (33) a time t for heating a number n of points in accordance with said voltage U of said power source, with said internal resistance r u of the power source, with at least one effective resistance r d of at least one point to be printed in order to print said data, and with at least one parasitic resistance value r p of at least one element of said thermal printer.