Rotating Member White Reference Surface Marker Configuration
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Solution Overview
Problem
Image quality variation after correction using white reference data is not effectively suppressed in configurations where a reference marker is provided on only one end side of the white reference surface in the axial direction of a rotating member.
Innovation Solution
An image reading system with a rotating member having a flat white reference surface and reference markers on both ends, where a processor sets a reading reference position between the rotation positions of the markers to control the reading section for consistent image acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a reference marker is provided on only one end side of the white reference surface, then the device complexity is reduced, but the image quality variation after correction increases
Solution Approach 1:
The white reference surface is divided into multiple segments along the axial direction, with reference markers placed at both ends. This segmentation allows the system to detect and correct for rotational position variations more accurately, thereby maintaining image quality consistency without significantly increasing device complexity.
Solution Approach 2:
The system changes the parameter of reference marker placement from single-end to both-ends configuration. This parameter change enables the detection of rotation position differences and allows for dynamic adjustment of the reading reference position, thus suppressing image quality variation while keeping the overall device structure relatively simple.
2Measurement precision
If reference markers are provided on both end sides of the white reference surface, then the measurement precision of rotation position is improved, but the device complexity increases
Solution Approach 1:
By placing reference markers at both ends of the white reference surface, the system segments the detection task into two separate measurements. This allows for more precise determination of the rotating member's position by comparing the timing of marker passages, achieving high measurement precision with a relatively simple marker configuration.
Solution Approach 2:
The system uses the timing information from both reference markers as feedback to determine the rotation position of the rotating member. This feedback mechanism enables accurate measurement of rotational position and speed without requiring complex sensors or additional hardware, thus improving measurement precision while maintaining device simplicity.
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 suppresses variations in image quality after shading correction by ensuring consistent white reference data reading, regardless of the rotation direction of the rotating member, and allows for accurate setting of the reading reference position.
Implementation Method 1
a flat white reference surface that is provided on an outer periphery of the rotating member and from which white reference data is read by the reading section
Implementation Method 2
a line sensor having a plurality of photoelectric conversion elements arranged in a one dimensional manner
Data Source
AI summary
An image reading system includes a reading section that is provided in a conveyance path for conveying a document and that reads an image from the document conveyed through the conveyance path; a rotating member that is disposed opposite to the reading section across the conveyance path and rotates with a main scanning direction of the reading section as an axial direction; a flat white reference surface that is provided on an outer periphery of the rotating member and from which white reference data is read by the reading section; reference markers that are provided on both end sides of the white reference surface in the axial direction and are read by the reading section; and a processor that, in a case where rotation positions of the rotating member when the respective reference markers are read are different, sets a reading reference position of the white reference data between the read rotation positions of the rotating member and controls the reading section to perform reading at a position based on the reading reference position.