Printhead Clock Skew Adjustment via Integrated Error Detection
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Solution Overview
Problem
Conventional printing apparatuses face challenges in adjusting clock skew due to manufacturing variations and noise interference, leading to data transmission errors and improper printing operations.
Innovation Solution
A printhead with integrated drive, logic, and detection circuits that adjust clock skew based on error detection results, ensuring optimal synchronization with the characteristics of each printhead and operation status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional skew adjustment techniques are used, then data transmission errors can be prevented under ideal conditions, but timing errors occur when printhead characteristics vary due to manufacturing variations or noise interference during printing operations
Solution Approach 1:
The patent implements a feedback mechanism where the printhead detects data transmission errors and sends this information back to the control apparatus. The control apparatus then adjusts the skew width based on this feedback, creating a closed-loop system that adapts to varying printhead characteristics and maintains reliable data transmission under different operating conditions
Solution Approach 2:
The patent dynamically changes the skew width parameter based on detected error conditions. When errors are detected, the system adjusts the skew width to a predetermined value, transforming a static skew adjustment system into a dynamic one that adapts to changing printhead characteristics and environmental conditions
2Ease of manufacture
If fixed skew adjustment is applied to all printheads, then manufacturing complexity is reduced, but manufacturing variations and noise interference cause timing errors and improper printing operations
Solution Approach 1:
The printhead performs self-diagnosis by detecting data transmission errors and automatically providing feedback about its own characteristic variations. This self-service capability allows each printhead to adjust to its own specific conditions without requiring complex external calibration equipment or manual adjustment procedures
Solution Approach 2:
The system performs preliminary skew adjustment during the printing operation itself by continuously monitoring for errors and adjusting the skew width in real-time. This preliminary action within the operation process ensures timing precision is established before actual printing begins, rather than relying on pre-manufactured fixed settings
Data Source
AI summary
In order to solve a problem that the skew width of a clock when data is transmitted to printheads changes depending on the characteristics of and variations in the respective printheads integrated in a printing apparatus or the operation mode of the printing apparatus, clock skew is adjusted based on a detection result by an error detection circuit integrated in each printhead when the data is transmitted to the printhead. This makes it possible to adjust skew in accordance with the characteristics of the respective printheads or a status change at the time of a printing operation.