Liquid Discharge Apparatus Density Correction via Movable Sensor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid discharge apparatuses face challenges in correcting density unevenness in image formation due to variations in liquid distribution across the recording medium, leading to suboptimal image quality.
Innovation Solution
A liquid discharge apparatus equipped with a head, sensor, and control circuitry that measures density during initial scanning, moves measurement positions, and adjusts discharge parameters in subsequent scans to correct density unevenness, ensuring uniform image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If density measurement is performed only at fixed positions, then measurement process is simple, but density unevenness cannot be corrected across the entire recording medium
Solution Approach 1:
The measurement position is made movable rather than fixed. The apparatus moves the measurement position to multiple locations across the recording medium during the scanning process, enabling comprehensive density measurement and correction across the entire surface while maintaining a relatively simple sensor structure.
Solution Approach 2:
The measurement system serves multiple functions: it measures density at various positions, tracks measurement positions, and provides data for correction calculations. This multi-functionality allows comprehensive density correction without requiring separate specialized devices for each function.
2Manufacturing precision
If liquid discharge is performed without real-time density feedback, then discharge process is fast, but density unevenness occurs in the formed image
Solution Approach 1:
Density measurement is performed during the scanning process before the discharge is completed. The system measures density at various positions in advance and uses this information to calculate correction amounts that are applied to subsequent discharge operations, preventing density unevenness before it occurs.
Solution Approach 2:
The system implements real-time feedback by measuring density during scanning, comparing it with target values, calculating correction amounts, and applying these corrections to the discharge process. This closed-loop control ensures density uniformity while maintaining efficient discharge operation.
3Manufacturing precision
If multiple measurement positions are used, then comprehensive density correction is achieved, but measurement and processing time increases
Solution Approach 1:
The measurement process is integrated into the continuous scanning operation. The sensor measures density at multiple positions during the normal scanning motion without requiring separate measurement passes, maintaining continuous productive action while gathering comprehensive density data for correction.
Data Source
AI summary
A liquid discharge apparatus includes a head, a sensor, a motor, and control circuitry. The head is configured to discharge liquid in a plurality of times of scanning. The sensor is configured to measure a density of a region formed with the liquid discharged in first scanning among the plurality of times of scanning. The motor is configured to move a measurement position at which the sensor performs measurement. The control circuitry is configured to control discharge of the head in second scanning performed after the first scanning among the plurality of times of scanning, based on the measurement position and the density measured at the measurement position.