Reading Apparatus Home Position Deviation Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing flatbed reading apparatuses face challenges in accurately determining the reading range due to deviations in the attachment of the black-and-white pattern, leading to incorrect detection of the origin point, which affects the precision of the reading range correction.
Innovation Solution
The reading apparatus employs a contact image sensor (CIS) unit with a light source and a movable assembly to read a white-black pattern on the inner surface of the top panel, using a CPU to detect the deviation of the home position and calculate correction values to accurately determine the reading range by referencing the intersection of the boundaries between the black and white areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a black-and-white pattern is attached manually to the lower surface of the cover, then the origin point can be detected, but the attachment position may deviate from the correct position causing inaccurate origin point detection
Solution Approach 1:
The patent applies preliminary action by forming a dent with edges in the cover during the manufacturing process, before the cover is assembled. This dent serves as a pre-positioned reference feature that eliminates the need for manual attachment of separate patterns, ensuring the origin point is accurately positioned from the factory without requiring manual precision.
2Measurement precision
If the cover is colored in dark color such as black, then the appearance is aesthetic, but the reflected light from the dent and peripheral areas does not differ largely making edge position detection inaccurate
Solution Approach 1:
The patent applies local quality by creating a dent with specific edge characteristics that locally alter the light reflection properties. The dent's edges create a distinct light reflection pattern compared to the surrounding dark cover surface, providing sufficient contrast for detection despite the overall dark coloring of the cover.
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 solution ensures accurate detection of the reading range coordinates, enabling precise correction and reliable image reading by accounting for deviations in the attachment of the white-black pattern, thereby improving the overall reading accuracy.
Implementation Method 1
a light source and a contact image sensor (CIS) unit... read an image of a white-black pattern
Data Source
AI summary
A reading apparatus, having a document placement table, a cover, a reader, and a controller, is provided. The cover has, on a facing surface thereof that faces the reader, a reference section having a first edge extending in a sub-scanning direction and a second edge extending in a main scanning direction, and a colored part on peripheries of the reference section. The colored part is colored along the first edge and along the second edge. The controller is configured to operate the reader to read the colored part and the peripheries of the colored part, detect a first position being a position of the first edge in the main scanning direction and a second position being a position of the second edge in the sub-scanning direction in an outcome of reading, and determine a reading range based on the first position and the second position.