Switchable Background Section for Sheet Edge Detection
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Solution Overview
Problem
Existing image forming apparatuses struggle to accurately detect the positions of side ends of colored sheets due to insufficient contrast at the positions of the ends.
Innovation Solution
A reading device is introduced, comprising a conveyor, a reader with a reading sensor, and a hardware processor. The reader includes a background section with a background surface that can be switched based on the attribute information of the sheet, ensuring high contrast for accurate edge detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a contact image sensor (CIS) is used to detect sheet positions, then the sheet width can be measured, but accurate detection of colored sheet edges fails due to insufficient contrast
Solution Approach 1:
A background section is introduced as an intermediary element between the reading sensor and the sheet. This background section provides a reference background surface that enhances the contrast between the sheet edges and the background, enabling accurate detection of sheet positions even for colored sheets that would otherwise blend with the background.
Solution Approach 2:
The background section is configured with a background surface having a color different from the sheet color. This color difference creates sufficient contrast at the sheet edges, allowing the reading sensor to accurately detect the sheet boundaries regardless of the sheet's color characteristics.
2Device complexity
If a fixed background surface is used in the reading device, then the device structure is simple, but detection accuracy deteriorates when processing sheets of different colors
Solution Approach 1:
The background section is designed to be switchable, allowing the background surface to be dynamically changed based on the sheet color. This dynamic capability enables the system to adapt to different sheet colors and maintain high detection accuracy without requiring a completely complex multi-component structure.
Solution Approach 2:
The background surface parameter (color) is changed according to the sheet color being processed. By adjusting the background surface color to provide optimal contrast for each sheet type, the system maintains high measurement precision across different sheet colors while keeping the overall device structure relatively simple.
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
The solution enables accurate detection of sheet size and shape, even for colored sheets, by ensuring sufficient contrast between the sheet edges and the background surface, thereby improving the precision of image formation and correction.
Implementation Method 1
a reader provided with a reading sensor that optically reads the sheet conveyed through the conveyance path
Data Source
AI summary
A reading device includes a reader provided with a reading sensor that optically reads a sheet conveyed through a conveyance path, and a hardware processor that controls the reader, in which the reader includes a background section that is disposed to face the reading sensor across the conveyance path, the background section having a background surface serving as a background of the sheet when the sheet is read, and the hardware processor switches the background surface of the background section on the basis of attribute information of the sheet to be conveyed.