Thermal Pulse Control for Color Development Density in Recording Apparatus
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Solution Overview
Problem
Existing color recording techniques using thermal paper and ink ribbons often result in insufficient development density, particularly in the trailing portions of high-density color areas, due to inadequate heat propagation from subsequent pixels.
Innovation Solution
A recording apparatus with a recording head, a conditional determination unit, and a pulse control unit that adjusts thermal energy based on the thermal history of preceding pixels to ensure adequate color development density, particularly in trailing portions by increasing thermal energy for pixels in high-density areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard thermal energy is applied to all pixels uniformly, then the recording process is simple and fast, but trailing portions of high-density color areas have insufficient development density
Solution Approach 1:
The patent applies different pulse control strategies to different pixel positions based on their thermal history. Specifically, pixels in trailing portions of high-density color areas receive enhanced thermal energy compared to standard pixels, while pixels in low-density areas receive standard or reduced energy. This local differentiation resolves the contradiction by improving development density where needed without uniformly increasing complexity across the entire recording process.
Solution Approach 2:
The system performs preliminary thermal analysis by calculating thermal history for each pixel before applying pulse control. This preliminary action identifies which pixels are likely to have insufficient development density based on their position relative to high-density color areas, allowing the control unit to pre-adjust pulse parameters for those specific pixels before the actual recording occurs.
2Manufacturing precision
If thermal energy is increased for all pixels to ensure sufficient development density, then color development density improves, but energy consumption and heating time increase
Solution Approach 1:
Instead of uniformly increasing thermal energy for all pixels, the system selectively applies enhanced thermal energy only to pixels in trailing portions of high-density color areas where development density is insufficient. Other pixels receive standard or reduced energy levels, thereby avoiding unnecessary energy consumption while still ensuring adequate development density where required.
Solution Approach 2:
The system applies partial excessive action by providing more thermal energy than the standard level only to the specific subset of pixels that need it (trailing portions of high-density areas), rather than applying excessive energy universally. This partial approach ensures sufficient development density in critical areas while minimizing overall energy consumption.
3Productivity
If pulse control is simplified without considering thermal history, then the control process is faster and less complex, but density variations between pixels increase
Solution Approach 1:
The system performs preliminary calculation of thermal history for each pixel before applying pulse control. This preliminary action uses the image data and known thermal characteristics to determine which pixels require enhanced thermal energy, allowing the control unit to prepare appropriate pulse parameters in advance. This approach maintains relatively fast processing by using efficient thermal history calculation methods while achieving improved density uniformity through targeted pulse adjustment.
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 enhances color development density in trailing portions by optimizing thermal energy application, reducing density variations between pixels and improving overall image quality.
Implementation Method 1
The recording head is configured to heat a sheet-like recording medium based on image data to form an image on the recording medium by causing a desired color developing layer to develop color among a plurality of color developing layers stacked in the recording medium
Data Source
AI summary
To prevent an insufficient development density of pixels with which a high-density image is recorded. Thermal energy to be applied to a pixel of interest is increased if a pixel immediately subsequent to the pixel of interest is one to which energy not causing heat propagation to the pixel of interest is applied.