Image Reader Reference Member Positioning for Calibration Accuracy
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Solution Overview
Problem
Existing image readers face challenges in accurately calibrating and reading manuscripts due to protruding reference white plates, which disrupt the focal point and cause displacement issues, making it difficult to perform calibration and reading accurately.
Innovation Solution
The design incorporates a transparent plate with a reference member positioned to maintain the same height as the manuscript contact surface, allowing the detecting portion to move and focus on both the reference surface and the manuscript without protrusion, ensuring accurate calibration and reading by maintaining the same environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reference white plate is provided on the top surface of the manifold platen, then calibration can be performed, but the reference white plate protrudes above the manifold platen and comes into contact with the desk, causing the manifold to float and displace from the focal point
Solution Approach 1:
The reference member is repositioned from a vertical protrusion (third dimension) to a horizontal integration within the platen surface plane. By embedding the reference member in the first scanning direction within the platen structure rather than allowing it to protrude vertically, the system eliminates the contact issue with the desk while preserving calibration functionality.
Solution Approach 2:
The reference member is nested within the manifold platen structure itself, integrated into the platen body in the first scanning direction. This nesting approach allows the reference member to be housed within the platen's internal structure, preventing protrusion while maintaining its calibration function.
2Shape
If the reference white plate is provided below the manifold platen, then it does not protrude, but it comes closer to the detecting element causing displacement in height direction and difficulty to focus on both reference and manifold
Solution Approach 1:
The reference member is repositioned from a location below the platen (negative height direction) to a location within the platen surface plane (zero height displacement). This dimensional repositioning eliminates the height displacement issue while maintaining proper focal alignment for both calibration and reading operations.
Solution Approach 2:
The manifold platen itself serves as an intermediary structure that houses the reference member. By using the platen as the reference member's host structure, the system achieves proper spacing and focal alignment without requiring the reference member to be below the platen surface.
3Manufacturing precision
If the reference member is integrated into the manifold platen, then it does not protrude and maintains focal point, but requires precise positioning in the first scanning direction
Solution Approach 1:
The manifold platen is segmented into functional zones: a first region for manuscript placement and a second region for reference member integration. This segmentation allows the reference member to be positioned in a dedicated area without interfering with the manuscript reading function, simplifying manufacturing and assembly.
Solution Approach 2:
The manifold platen serves multiple functions: it supports the manifold during reading operations and houses the reference member for calibration. This multi-functionality eliminates the need for separate reference member mounting structures, simplifying the overall device architecture while maintaining precision.
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 enables precise calibration and reading of manuscripts by maintaining consistent focal points and environmental conditions, reducing variations in output signals from detecting elements and enhancing the accuracy of image capture.
Implementation Method 1
detecting portion includes a plurality of detecting elements in the second scanning direction. A plurality of detecting elements is configured to detect reflected light of light irradiated from a light source
Data Source
AI summary
An image reader includes a moving portion, a transparent plate, a reference member, and a detecting portion. The reference member that is provided in at least one of a position that is not the manuscript contact surface in the first scanning direction and a position that is further to a side in a first direction from the transparent plate than the manuscript contact surface. The detecting portion is supported by the moving portion and includes a plurality of detecting elements, in the second scanning direction, detecting reflected light of light irradiated from a light source. A height position of the detecting portion when the reference member is on the side in the first direction is further to the side in the first direction than a height position of the detecting portion when the manuscript contact surface is on the side in the first direction.