Image Forming Apparatus Calibration Sheet Type Management
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Solution Overview
Problem
The accuracy of calibration in image forming apparatuses using auto document feeders is compromised due to sheet type-dependent fluctuations in test chart distance from the sensor, leading to reading errors and varying detection accuracy, especially during flow reading.
Innovation Solution
The image forming apparatus employs a controller to manage the usage of different sheet types based on calibration types, allowing specific sheet types for tone correction and geometric adjustments, ensuring accurate calibration while optimizing the reading mode between ADF and platen reading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flow reading is used for calibration to improve efficiency, then calibration efficiency is improved, but reading accuracy deteriorates due to test chart distance fluctuations
Solution Approach 1:
The system changes the operational parameters by selecting different reading modes (flow reading or fixed reading) based on sheet type characteristics. For sheets prone to fluttering, the system switches to fixed reading mode to maintain measurement precision, while using flow reading mode for sheets that maintain stable positioning to preserve calibration efficiency.
Solution Approach 2:
The system dynamically adjusts the reading mode based on detected sheet type properties. The controller monitors sheet characteristics during calibration and adapts the reading method in real-time, switching between flow reading and fixed reading modes to optimize both efficiency and accuracy for different sheet types.
2Productivity
If flow reading is used for all sheet types, then calibration efficiency is improved, but calibration accuracy cannot be ensured for all sheet types
Solution Approach 1:
The system applies different reading methods to different sheet types based on their specific characteristics. Instead of using a uniform flow reading approach for all sheets, the system identifies sheet types with high fluttering tendencies and applies fixed reading mode specifically to those sheets, while using flow reading mode for sheets that maintain stable positioning.
Solution Approach 2:
The calibration process is segmented into different reading mode categories (flow reading and fixed reading) based on sheet type characteristics. The system divides sheet types into groups that are suitable for each reading mode, ensuring that each group receives the appropriate reading method for accurate calibration.
3Measurement precision
If fixed reading is used for calibration, then reading accuracy is improved, but calibration efficiency deteriorates
Solution Approach 1:
The system changes the reading mode parameter based on sheet type properties. For sheet types that maintain stable positioning during conveyance, the system uses flow reading mode to achieve high calibration efficiency. For sheet types prone to fluttering, the system switches to fixed reading mode to ensure measurement precision.
Data Source
AI summary
An image forming apparatus includes an image forming unit configured to form an image, a conveying unit configured to convey a sheet on which the image is formed, a reader configured to read the sheet conveyed by the conveying unit and a controller. The controller is configured to execute first calibration in which a density of an image to be formed by the image forming unit is controlled based on a result of reading by the reader, and execute second calibration in which a geometric characteristic of an image to be formed by the image forming unit is controlled based on a result of reading by the reader. The controller allows usage of a sheet of a first type in the first type of calibration, wherein the controller prevents usage of a sheet of a second type in the first type of calibration.