Image-Reading Device Light Blocking Slit for Reading Accuracy
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Solution Overview
Problem
Conventional image-reading devices face challenges in accurately reading images due to the influence of image density outside the reading range, as diffusely reflected light from outside the range enters the reading mechanism, affecting the reading result within the intended range.
Innovation Solution
The implementation of an image-reading device with a light-blocking part and a reflection plate that narrows the light emission to a slit, ensuring only light within the reading range enters the recording medium, thereby reducing external light interference and improving reading accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted to the recording medium without restriction, then the reading range is sufficiently illuminated, but light from outside the reading range enters the reading means and degrades measurement precision
Solution Approach 1:
The light-blocking part divides the light path into distinct segments: light within the reading range passes through the slit to illuminate the recording medium, while light from outside the reading range is blocked by the light-blocking part. This segmentation prevents contamination of the reading signal by extraneous light, thereby improving measurement precision while maintaining sufficient illumination within the reading range.
Solution Approach 2:
The light-blocking part introduces local quality differentiation in the optical path: the slit region allows light transmission for the reading range, while surrounding regions are blocked. This creates a localized illumination zone that matches the reading range, ensuring high measurement precision without compromising overall illumination intensity within the target area.
2Measurement precision
If a light-blocking part with a slit is introduced to restrict light emission, then image reading accuracy is improved, but device complexity increases
Solution Approach 1:
The light-blocking part with slit extracts and removes the harmful element (extraneous light from outside the reading range) from the optical system. By taking out this interfering light path, the system achieves higher measurement precision without requiring complex additional components, as the light-blocking part serves as a simple yet effective filtering element.
Solution Approach 2:
The light-blocking part acts as an intermediary element between the light source and the recording medium. It mediates the light transmission by allowing only the desired light paths (through the slit) to reach the recording medium, thereby improving measurement precision while adding minimal structural complexity compared to more complex optical filtering systems.
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 allows for more accurate image reading by minimizing the impact of image density outside the reading range, enhancing the precision and reliability of the image data captured by the line sensor.
Implementation Method 1
a light-blocking part 251 which blocks light that was emitted from the light source 253 and goes toward the recording medium M
Implementation Method 2
a reflection plate 252 which reflects the light that was emitted from the light source 253 so as to enter the slit 251a
Implementation Method 3
the image-reading device detects reflected light at the recording medium of the light which was emitted from the light source with the reading means
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
Provided is an image-reading device (25) for reading an image by moving a recording medium (M) and a reading range (R) relative to each other, the recording medium (M) having the image recorded thereon and the reading range (R) being a range in which a part of the image is read, the device including: a light source (253); a light-blocking part (251) which blocks light that is emitted from the light source (253) and goes toward the recording medium (M); and a reading means (255) which reads the image recorded on the recording medium (M) by detecting light that passes through a slit (251a) provided in the light-blocking part (251) from among reflected light of light that is emitted from the light source (253), passes through the slit (251a) and enters the reading range (R) in the recording medium (M).