Image Reading Apparatus Illumination Control for Color Deviation
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Solution Overview
Problem
Existing image reading apparatuses face challenges in maintaining optimal illumination intervals for high and low image reading resolutions, leading to color deviations and inefficiencies in image processing.
Innovation Solution
The apparatus incorporates a control unit that adjusts illumination intervals based on the image reading resolution, ensuring a difference between illumination cycles by using a combination of LEDs emitting red, green, and blue light, and optimizing the timing of light emission to minimize color deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed illumination intervals are used for all resolutions, then device complexity is reduced, but color deviations occur and manufacturing precision deteriorates
Solution Approach 1:
The illumination interval is changed from a fixed value to a dynamic value that varies according to the image reading resolution. The control unit adjusts the illumination interval based on the selected resolution, making the system adaptive rather than static. This resolves the contradiction by allowing the system to optimize color accuracy for each resolution level while maintaining relatively simple control logic through predefined interval values.
Solution Approach 2:
The illumination interval parameter is changed based on the image reading resolution parameter. Different illumination intervals are set for different resolutions (e.g., first illumination interval for high resolution, second illumination interval for low resolution). This parameter adaptation allows the system to maintain color accuracy across different operating conditions without requiring complex real-time calculations.
2Manufacturing precision
If illumination intervals are optimized for high resolution, then manufacturing precision is improved, but productivity decreases due to longer illumination cycles
Solution Approach 1:
The system changes the illumination interval parameter based on the required image reading resolution. For high resolution readings, a first (longer) illumination interval is used to ensure color accuracy. For low resolution readings, a second (shorter) illumination interval is used to maintain faster processing. This dynamic parameter adjustment allows the system to optimize for speed when high precision is not required.
Solution Approach 2:
The illumination cycle duration is made dynamic rather than fixed, allowing the system to adapt the cycle length to the current operational requirements. When high resolution is selected, the cycle lengthens to improve precision; when low resolution is selected, the cycle shortens to improve throughput. This dynamic adaptation resolves the speed-precision tradeoff.
3Productivity
If illumination intervals are optimized for low resolution, then productivity is improved, but color accuracy deteriorates due to insufficient illumination time
Solution Approach 1:
The system implements resolution-dependent illumination interval parameters. When low resolution is selected, a shorter second illumination interval is used to maintain high productivity. When high resolution is selected, a longer first illumination interval is used to ensure adequate illumination time for color accuracy. The control unit automatically selects the appropriate interval based on the resolution setting.
4Device complexity
If uniform illumination timing is used across color cycles, then device complexity is reduced, but color deviations occur due to resolution-mismatched timing
Solution Approach 1:
The control unit dynamically adjusts the illumination timing within each color cycle based on the selected resolution. For high resolution, the timing is optimized to capture fine color details. For low resolution, the timing is adjusted accordingly. This dynamic timing adjustment maintains color consistency across different resolutions without requiring overly complex control logic, as the adjustments are based on predefined intervals.
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 solution effectively reduces color deviations and enhances image quality by aligning illumination intervals with the image reading resolution, improving the overall efficiency of the image reading process.
Implementation Method 1
an illumination unit that is disposed so as to be moved relative to a recording medium and illuminates the recording medium with light beams of plural colors that are circulated in predetermined order
Implementation Method 2
a reading unit that reads an image recorded on the recording medium by receiving reflection light that is produced as a result of the illumination unit's illuminating the recording medium
Data Source
AI summary
An image reading apparatus includes: an illumination unit that is disposed so as to be moved relative to a recording medium and illuminates the recording medium with light beams of plural colors that are circulated in predetermined order; a reading unit that reads an image recorded on the recording medium by receiving reflection light that is produced as a result of the illumination unit's illuminating the recording medium during the moving relative to the recording medium; and a control unit that controls the illumination unit so that a difference between a first illumination interval and a second illumination interval is determined based on a reading resolution of the reading unit.