Image Reading Device Side-Illumination Glass
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Solution Overview
Problem
Conventional image reading devices dazzle users with direct light emission, making it difficult to visually recognize foreign matter like dust or dirt on the document reading surface due to the intense light emitted by LED sources directly towards the glass surface.
Innovation Solution
The image reading device employs a light emission control unit that directs light to enter the reading glass through a side surface, allowing the light to cross the document reading surface, thereby reducing direct light exposure to the user and enhancing visibility of foreign matter by scattering light from the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source emits light directly toward the reading glass surface, then the illumination intensity is high, but the user is dazzled and cannot easily recognize foreign matter on the glass
Solution Approach 1:
The light source is positioned and oriented to emit light from the side rather than directly from below the reading glass. This dimensional change in light emission direction allows the light to illuminate the glass surface at an angle, providing sufficient illumination intensity while preventing direct light from reaching the user's eyes, thereby eliminating dazzle and enabling clear visibility of foreign matter.
2Illumination intensity
If the light source emits light directly toward the reading glass surface, then the illumination is sufficient for reading, but foreign matter like dust or dirt on the glass becomes difficult to visually recognize
Solution Approach 1:
By changing the light emission direction from perpendicular to the glass surface to an angled side emission, the light interacts with foreign matter on the glass surface to create visible scattering patterns. This dimensional change in illumination geometry enhances the contrast between foreign matter and the glass surface, making dust and dirt easily detectable while maintaining sufficient illumination for document reading.
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 reduces user dazzle and improves visibility of foreign matter on the glass surface by scattering light, allowing for easier recognition and removal of dust or dirt.
Implementation Method 1
a light source that emits light toward a document on a reading glass... receives light reflected by the document with a sensor
Implementation Method 2
allows the light to cross the document reading surface, thereby reducing direct light exposure to the user and enhancing visibility of foreign matter by scattering light from the surface
Data Source
AI summary
An image reading device includes a glass having a document reading surface along which a document moves; an image reading unit movable in a sub-scanning direction and including a light emitting portion that emits light to illuminate the document with the light and a light receiving portion that receives the light reflected by the document, the image reading unit reading the document that moves along the document reading surface at a predetermined document reading position; and a light emission control unit that causes the light emitting portion to emit the light so that the light enters the glass through a side surface that crosses the document reading surface in an operation different from an operation in which the image reading unit reads the document.