Image Reading Device Center Scanning Custom Originals
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Solution Overview
Problem
Image reading devices often fail to correctly read originals with custom sizes or when the original is not positioned correctly, leading to incomplete scanning, and image forming devices struggle to accurately position images on recording sheets with different sizes, resulting in partial or misaligned copies.
Innovation Solution
The image reading device is equipped with holding means to read originals from the center and forming means to align images on recording sheets, allowing user input for maximum reading width and magnification settings, with shifting and data adjustment mechanisms to ensure accurate positioning and sizing of image data based on user instructions and detected dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the image reading device uses automatic size detection with reference to a reading reference point, then the reading process is automated and efficient, but the original size may be detected incorrectly when the original has custom size or is mispositioned, leading to incomplete scanning
Solution Approach 1:
The patent applies preliminary action by performing maximum width reading first to detect the actual original dimensions before conducting the final reading. The device initially reads the entire original at maximum width to accurately detect its true size and position, then uses this information to set the appropriate reading width and reference point for the final reading, ensuring complete and accurate scanning of the original document
Solution Approach 2:
The patent uses an intermediary approach by introducing a two-stage reading process where the first reading at maximum width serves as an intermediate step. This intermediate reading provides accurate size and position information that mediates between the automated detection system and the final reading execution, allowing the device to correctly identify custom-sized originals and adjust reading parameters accordingly
2Device complexity
If the image forming device forms images with reference to a writing reference point at one side of the recording sheet, then the image forming process is simplified, but the image may not be positioned correctly when the original size differs from the recording sheet size
Solution Approach 1:
The patent applies dynamics by making the writing reference point adjustable rather than fixed. The device can dynamically change the writing reference point position based on the detected original size and the selected recording sheet size. When sizes match, the reference point is at one side for simple processing; when sizes differ, the reference point is adjusted to ensure proper image positioning, thus adapting the system behavior to different conditions
Solution Approach 2:
The patent uses parameter changes by adjusting the writing reference point position parameter according to the relationship between original size and recording sheet size. The system changes this critical parameter to maintain accurate image positioning - keeping it at one side when sizes are equal for simplicity, and adjusting it when sizes differ to achieve correct positioning, thus optimizing both simplicity and accuracy based on conditions
3Ease of manufacture
If the reading reference point and writing reference point are positioned differently, then the reading and forming processes can be independently optimized, but misalignment occurs between the read image data and the formed image position
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the writing reference point position based on the detected original size and recording sheet size relationship. When the original size equals the recording sheet size, the writing reference point is positioned at one side for simple processing. When sizes differ, the writing reference point position is changed to ensure the image is correctly positioned on the recording sheet, thus maintaining alignment accuracy while allowing independent optimization of reading and forming processes
Data Source
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AI summary
An image reading device includes reading means, which reads an original into image data by scanning the original in the main scanning direction at an image reading width while the original is being fed in a sub scanning direction; and setting means, which sets the image reading width to a maximum reading width of the reading means when reading settings information including a user instruction for setting the image reading width to the maximum reading width is input.