Scanner Reader Dynamics for Tilted Glass Alignment
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Solution Overview
Problem
Related-art image scanners face performance degradation when reading images on both stationary and moving originals due to the tilted glass strip relative to the exposure glass, leading to uneven vertical distances and non-perpendicular light axes, which affect the image reading quality.
Innovation Solution
An image scanner design where the moving original plate is aligned with the stationary original plate and tilted relative to it by a given angle, allowing the reader to move between dedicated reading positions while maintaining contact and ensuring perpendicular light axes for both stationary and moving originals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the glass strip is tilted relative to the exposure glass to enable straight conveyance of rigid originals, then the conveyance path is simplified and rigid originals can be conveyed without bending, but the vertical distance between the reader and the glass strip becomes greater than that between the reader and the exposure glass, degrading image reading performance
Solution Approach 1:
The reader is designed to be movable not only in the horizontal direction but also in the vertical direction, allowing it to dynamically adjust its position to maintain optimal reading distance and angle for both the exposure glass and the tilted glass strip, thus resolving the contradiction between conveyance simplicity and reading performance
2Ease of manufacture
If the glass strip is tilted relative to the exposure glass, then rigid originals can be conveyed straight without bending, but the optical axis of light emitted from the reader to the moving original becomes non-perpendicular to the glass strip, degrading image reading performance
Solution Approach 1:
The reader incorporates vertical movement capability to dynamically adjust its orientation and position, ensuring that the optical axis remains perpendicular to the glass strip surface regardless of the strip's tilt angle, thereby maintaining high image reading performance while preserving the simplicity of the conveyance path
3Ease of operation
If the reader moves horizontally from the home position to the moving original reading position, then the reading positions for both stationary and moving originals can be accessed, but the vertical distance difference between the reader and the glass strip versus exposure glass degrades reading performance
Solution Approach 1:
The reader is designed with two-degree-of-freedom movement (horizontal and vertical), allowing it to access different reading positions while dynamically maintaining the optimal vertical distance and horizontal alignment for high-quality image reading on both stationary and moving originals
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 configuration ensures precise image reading for both stationary and moving originals by maintaining consistent vertical distances and light axis alignment, enhancing the scanner's performance and accuracy.
Implementation Method 1
light emitted from the reader irradiates the stationary original placed on the exposure glass 21 vertically
Data Source
AI summary
An image scanner includes a stationary original plate on which a stationary original is placed and a moving original plate, over which a moving original is conveyed, aligned with the stationary original plate in a sub-scanning direction and tilted relative to the stationary original plate by a given angle. A reader is movable in the sub-scanning direction between a stationary original reading span disposed opposite the stationary original via the stationary original plate to read an image on the stationary original and a moving original reading position disposed opposite the moving original via the moving original plate to read an image on the moving original. The reader pressingly contacts the stationary original plate and the moving original plate as the reader moves in the sub-scanning direction.