Pixel Clock Generator Error Correction for Image Formation
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Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately generating a pixel clock to synchronize the scanning process, leading to errors in image formation due to variations in scanning speed and resolution changes, which complicates the switching between different register groups and affects the precision of the pixel clock correction.
Innovation Solution
A pixel clock generating device comprising a high-frequency clock generator, comparer, pixel clock generator, and value switcher, which measures the time interval between synchronizing signals, calculates errors, and corrects the pixel clock frequency by switching between groups of values based on a switching signal after the trailing-end synchronizing signal is inputted, ensuring accurate pixel clock generation and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel clock frequency is corrected based on time interval measurement between synchronizing signals, then the accuracy of pixel clock generation is improved, but the device complexity increases due to the need for comparer, value switcher, and multiple register groups
Solution Approach 1:
The patent segments the correction device into distinct functional modules: a comparer for measuring time intervals, a value switcher for selecting correction values, and multiple register groups for storing different correction parameters. This segmentation allows each component to perform its specific function efficiently, reducing overall system complexity while maintaining high measurement precision for pixel clock generation.
Solution Approach 2:
The patent introduces an intermediary mechanism (the value switcher and register groups) that mediates between the raw time interval measurement and the final pixel clock correction. This intermediary layer processes the measurement data and applies appropriate correction values, enabling accurate pixel clock generation without requiring the entire correction system to be constantly active, thus reducing effective operational complexity.
2Adaptability or versatility
If the switching between register groups is performed frequently to adapt to resolution changes, then the adaptability is improved, but the reliability deteriorates due to potential switching errors and timing issues
Solution Approach 1:
The patent prepares multiple register groups with pre-calculated correction values for different resolution settings before switching is needed. Each register group is pre-configured with appropriate correction parameters, allowing the system to switch between resolutions without performing real-time calculations during the switching moment, thereby maintaining reliability while achieving high adaptability.
Solution Approach 2:
The patent employs feedback mechanisms that monitor the switching process and the resulting pixel clock accuracy. The comparer continuously measures time intervals and provides feedback to verify that switching between register groups has achieved the desired correction. This feedback loop ensures that switching operations are validated, reducing switching errors and enhancing reliability while maintaining the ability to adapt to different resolutions.
Data Source
AI summary
A pixel clock generating device includes a high-frequency clock generator, a comparer, a pixel clock generator, and a value switcher. The high-frequency clock generator is configured to generate a high-frequency clock. The comparer is configured to measure a time interval between a leading-end synchronizing signal and a trailing-end synchronizing signal in a main scanning and calculate an error between the time interval and a target value. The pixel clock generator is configured to generate a pixel clock based on the high-frequency clock and a pixel clock frequency and correct the pixel clock based on the error. The value switcher, including a plurality of groups of values with which the pixel clock is generated, is configured to switch between the plurality of groups of values according to a switching signal after the trailing-end synchronizing signal is inputted, the comparer calculates the error, and the pixel clock generator corrects the pixel clock.