Thermoreversible Image Erasing via Temperature-Adaptive Laser Control
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Solution Overview
Problem
Thermoreversible recording media face challenges in maintaining coloring density due to difficulties in rapid cooling under high temperature environments and holding the decolored state under low temperature environments, leading to incomplete image erasure, especially in conveyor line systems exposed to sudden temperature changes.
Innovation Solution
An image erasing method that measures the surface temperature and environmental temperature of the thermoreversible recording medium before erasing, adjusting the heating time of the laser beams to ensure effective image removal without compromising throughput, by controlling the emitting power, scanning velocity, and spot diameter based on measured temperature values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thermoreversible recording medium is heated to equal to or higher than the coloring temperature range to develop color, then the image recording function is achieved, but under high temperature environments the medium is difficult to be rapidly cooled resulting in decreased coloring density
Solution Approach 1:
The patent applies preliminary action by pre-cooling the thermoreversible recording medium before laser beam irradiation when the medium temperature is high. The temperature management unit measures the medium temperature and, when it exceeds a predetermined threshold, activates the cooling unit to cool the medium before image recording. This preliminary cooling action ensures the medium is in the appropriate temperature state for effective coloring, resolving the contradiction between achieving reliable image recording and maintaining coloring density under high temperature conditions.
2Reliability
If the thermoreversible recording medium is heated to the decoloring temperature range and held for a predetermined period to erase image, then the image erasing function is achieved, but under low temperature environments the medium is difficult to be held within the decoloring temperature range resulting in decreased coloring density
Solution Approach 1:
The patent applies preliminary action by pre-heating the thermoreversible recording medium before laser beam irradiation when the medium temperature is low. The temperature management unit measures the medium temperature and, when it is below a predetermined threshold, activates the heating unit to heat the medium before image erasure. This preliminary heating action ensures the medium reaches and can be maintained within the decoloring temperature range, resolving the contradiction between achieving reliable image erasing and maintaining appropriate temperature for complete decoloring under low temperature conditions.
Solution Approach 2:
The patent applies continuity of useful action by extending the laser beam irradiation time when the medium temperature is low during image erasure. The temperature management unit not only pre-heats the medium but also increases the irradiation time to ensure the medium remains within the decoloring temperature range throughout the erasure process. This continuous thermal action compensates for heat loss in low temperature environments, ensuring complete image erasure while maintaining the necessary temperature conditions.
3Reliability
If the laser beam power is increased to ensure complete image erasure under low temperature conditions, then the erasing effectiveness is improved, but the throughput per day deteriorates due to extended heating time
Solution Approach 1:
The patent resolves this contradiction by applying preliminary heating action before laser beam irradiation. Instead of increasing laser power during erasure (which would extend processing time and reduce throughput), the system pre-heats the medium to the appropriate temperature range before erasure begins. This preliminary temperature preparation allows the erasure process to proceed efficiently at standard power levels, maintaining both complete image erasure and high throughput.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the laser beam irradiation time based on medium temperature. When the medium temperature is low, the system extends the irradiation time rather than increasing power, and when the temperature is appropriate, it uses standard irradiation time. This parameter adjustment strategy ensures complete erasure under varying temperature conditions while optimizing throughput by avoiding unnecessary power increases.
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
Prevents incomplete image erasure even under sudden temperature fluctuations, maintaining high throughput and image quality in conveyor line systems by optimizing the heating process based on real-time temperature measurements.
Implementation Method 1
heating a thermoreversible recording medium with laser beams to erase an image which has been recorded on the thermoreversible recording medium
Implementation Method 2
the thermoreversible recording medium reversibly changes between a colored state and a decolored state depending on a heating temperature and a cooling time
Data Source
AI summary
Provided is an image erasing method including heating a thermoreversible recording medium with laser beams to erase an image which has been recorded on the thermoreversible recording medium, the thermoreversible recording medium reversibly changing between a colored state and a decolored state depending on a heating temperature and a cooling time; and measuring at least one of a surface temperature of the thermoreversible recording medium and an erasing environmental temperature before a beginning of erasing the image to obtain a measured temperature value and controlling a heating time with the laser beams to be emitted for erasing the image depending on the measured temperature value.