Calibrating and Positioning Structure for Scanning Apparatus
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Solution Overview
Problem
Conventional scanning apparatuses face challenges in achieving accurate color level calibration and starting position determination due to unstable sensing voltage and interference from the transition region between calibration plates, leading to unsatisfactory imaging quality, especially when documents resemble the calibration structure.
Innovation Solution
A calibrating and positioning structure with a calibrating part aligned with the wide edge of the scanning window and positioning parts partially overlapping but not aligned with the edge, reducing interference and stabilizing sensing voltage for accurate color level calibration and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the positioning structure uses aligned calibration plates (white and black) at the scanning range starting position, then the color level calibration can be performed, but the sensing voltage becomes unstable and the transition region fluctuates, leading to insufficient calibration data
Solution Approach 1:
The patent applies asymmetry by positioning the black calibration plate such that its leading edge is offset from the scanning range starting position, creating an asymmetric arrangement where the white calibration plate is fully within the scanning range while the black plate extends beyond. This asymmetric positioning ensures that the transition region between white and black plates does not coincide with the scanning start, eliminating voltage instability and providing stable calibration data.
2Measurement precision
If the calibration structure is positioned at the scanning range starting position, then color level calibration can be performed, but documents similar to the calibration structure may cause erroneous judgment of the starting position
Solution Approach 1:
The patent introduces an intermediary element - the offset black calibration plate - that serves as a mediator between the white calibration plate and the document being scanned. By positioning the black plate's leading edge before the scanning range starts, it creates a distinct optical transition zone that acts as a reliable marker, preventing documents with similar color patterns from being misidentified as the calibration structure.
3Measurement precision
If conventional calibration plates are used with strong color contrast, then color level calibration can be performed, but the transition region between plates causes fluctuation in sensing voltage
Solution Approach 1:
The patent segments the calibration structure into two distinct parts: a white calibration plate positioned within the scanning range and a black calibration plate positioned with its leading edge before the scanning range starts. This segmentation creates a clear spatial separation that prevents the transition region from interfering with the scanning process, eliminating voltage fluctuation while maintaining strong color contrast for accurate calibration.
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 proposed structure achieves a flat transition region in sensing voltage, enhancing data sufficiency for color level calibration and improving the imaging quality of scanned images, while allowing for miniaturization and cost-effectiveness.
Implementation Method 1
A light-emitting element (not shown) and an image reader (not shown) are disposed within the scanning module 102. A light beam emitted from the light-emitting element is projected on the document 104
Implementation Method 2
the reflected light beam is received by the image reader within the scanning module 102
Implementation Method 3
the reflected light beam is received by the image reader within the scanning module 102. As a consequence, the image data of the document 104 are obtained
Data Source
AI summary
A calibrating and positioning structure of a scanning apparatus is provided. The scanning apparatus includes a scanning platform and a scanning window. The scanning window has a wide edge. The calibrating and positioning structure includes a calibrating part and at least one positioning part. The calibrating part is disposed on the scanning platform, and aligned with the wide edge of the scanning window. The at least one positioning part is partially overlapped with the calibrating part, wherein the positioning part is not aligned with the wide edge of the scanning window.