Image Reading Device Symmetrical Irradiation Brightness
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Solution Overview
Problem
Image reading devices experience brightness unevenness due to overlapping light from the irradiation portion and display screen, leading to suboptimal document scanning quality.
Innovation Solution
The device is configured with a placement surface, an imaging portion on the center side, a display portion on the far side, and a pair of irradiation portions on both sides of the imaging portion, which reduces brightness unevenness by symmetrically illuminating the document.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single irradiation portion is arranged near the imaging portion, then the device complexity is reduced, but brightness unevenness occurs in the original document due to overlapping light with the display screen
Solution Approach 1:
The single irradiation portion is divided into multiple irradiation portions (first irradiation portion and second irradiation portion) positioned at different locations. This segmentation allows each portion to illuminate different areas of the original document, preventing overlapping light with the display screen and eliminating brightness unevenness while maintaining manageable device complexity
Solution Approach 2:
Different irradiation portions are positioned to provide localized illumination to specific areas of the original document. The first irradiation portion illuminates the first area while the second irradiation portion illuminates the second area, ensuring that each region receives appropriate lighting without interference from the display screen, thus achieving uniform brightness across the document
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 effectively suppresses brightness unevenness and reflection disruptions, ensuring consistent illumination and improved scanning quality compared to setups with a single irradiation portion.
Implementation Method 1
an irradiation portion that is arranged on the center side of the placement surface in the apparatus width direction above the display portion in the apparatus upward and downward direction and irradiates the placement surface with light
Data Source
AI summary
An image reading device includes a placement portion in which a placement surface on which an original document is placed is formed, an imaging portion that is arranged on a center side of the placement surface in an apparatus width direction above the placement surface in an apparatus upward and downward direction and images the original document, a display portion having a display screen of which at least a part is arranged on a far side of the placement surface in an apparatus depth direction and the center side of the placement surface in the apparatus width direction between the placement surface and the imaging portion in the apparatus upward and downward direction, an irradiation portion that is arranged on the center side of the placement surface in the apparatus width direction above the display portion in the apparatus upward and downward direction and irradiates the placement surface with light, and a pair of other irradiation portions that are respectively arranged on both sides of the irradiation portion in the apparatus width direction above the display portion in the apparatus upward and downward direction and irradiate the placement surface with light.