Inkjet Printer Ink Landing Deviation Compensation
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Solution Overview
Problem
Inkjet printers face deviations in ink droplet landing positions due to varying gaps between the ink discharge surface and the wave-shaped recording sheet, and these deviations change with different moving velocities of the inkjet head, leading to inconsistent printing quality.
Innovation Solution
A method involving pattern printing at multiple velocities to acquire deviation values, where specific patterns are printed over varying ranges to determine representative values for each velocity, allowing for precise adjustment of ink discharge timings to compensate for these deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the inkjet head moves at different velocities to accommodate various printing modes, then printing versatility is improved, but the deviation value of ink landing positions varies, worsening printing precision
Solution Approach 1:
The system performs preliminary measurement of wave shapes and acquisition of deviation values at different velocities before actual printing. The control unit stores these pre-acquired deviation values and uses them to adjust ink discharge timing in advance, ensuring precise ink landing positions across various printing modes without requiring real-time complex calculations during printing operations.
Solution Approach 2:
The system incorporates feedback mechanisms where the control unit measures actual wave shapes and deviation values, stores this information, and uses it to adjust ink discharge timing. This closed-loop feedback ensures that the ink discharge timing is continuously optimized based on measured deviations, maintaining high printing precision across different velocities and printing modes.
2Reliability
If the recording sheet is held in a wave shape to improve feeding stability, then feeding reliability is improved, but the gap between ink discharge surface and recording sheet varies, worsening ink landing position consistency
Solution Approach 1:
The control unit performs preliminary measurement of the wave shape and acquisition of deviation values before printing. By pre-measuring the wave characteristics and storing the corresponding deviation values, the system can later use this information to adjust ink discharge timing in advance, compensating for the varying gaps caused by wave-shaped recording sheets and ensuring consistent ink landing positions.
Solution Approach 2:
The system dynamically adjusts the ink discharge timing parameter based on the measured wave shape and deviation values. By changing the timing parameter in response to the varying gap distances caused by wave-shaped recording sheets, the system maintains consistent ink landing positions despite the non-flat sheet surface.
3Manufacturing precision
If ink discharge timing is adjusted for each position on the wave-shaped recording sheet, then ink landing position precision is improved, but the complexity of timing control increases
Solution Approach 1:
The control unit performs preliminary measurement of wave shapes and acquisition of deviation values at different velocities, then stores this information in advance. During actual printing, the system simply retrieves the pre-stored deviation values and applies them to adjust ink discharge timing, eliminating the need for complex real-time calculations and significantly reducing control complexity while maintaining high precision.
Solution Approach 2:
The system creates a copy or lookup table of deviation values for different positions and velocities during preliminary measurement. During actual printing, the control unit references this pre-acquired data rather than calculating timing adjustments in real-time, simplifying the control process while ensuring precise ink landing positions across the entire recording sheet.
Data Source
AI summary
A method including acquiring a first deviation value of ink landing positions in each position in a first range from a first pattern printed over the first range of a recording sheet in a scanning direction at a first moving velocity of an inkjet head, acquiring variation information representing a variation in the scanning direction of the first deviation value, acquiring from the variation information a first representative value representing the first deviation value in the first range, acquiring a second deviation value from a second pattern printed over a second range included in the first range at a second moving velocity of the inkjet head, acquiring a second representative value representing a deviation value in the first range at the second moving velocity, based on the second deviation value and a difference between the first representative value and the first deviation value in the second range.