Document Transport Device Shading Pattern Size Recognition
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Solution Overview
Problem
Existing document transport devices face challenges in accurately recognizing document sizes due to variations in optical pattern density, leading to potential errors in size recognition.
Innovation Solution
Incorporating a movable piece with a shading pattern composed of patches of varying densities and a detector to accurately recognize document sizes, where the shading pattern includes distinct adjacent patch density differences to enhance precision and reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical pattern with constant density differences is used for document size recognition, then the detection system is simple, but the document size recognition precision deteriorates due to variations in pattern density
Solution Approach 1:
The patent applies local quality by varying the density of different regions (patches) within the shading pattern. Each patch has a specific density corresponding to a particular document size, allowing the detection system to accurately recognize document sizes by detecting which patch's density matches the reflected light characteristics. This resolves the contradiction by making the pattern non-uniform (more complex) to achieve better measurement precision.
Solution Approach 2:
The patent changes the density parameter of the shading pattern patches to correspond to different document sizes. By creating patches with distinct density values (first density, second density, third density, etc.), the system can differentiate between various document sizes through optical detection. This parameter variation enables precise measurement while maintaining a relatively simple detection mechanism.
2Measurement precision
If a shading pattern with varying patch densities is used, then document size recognition precision is improved, but the pattern design and manufacturing complexity increases
Solution Approach 1:
The shading pattern is segmented into multiple discrete patches, each with a specific density corresponding to a particular document size. This segmentation allows the complex pattern to be designed and manufactured as distinct, manageable units rather than a continuous gradient, simplifying the manufacturing process while maintaining the ability to provide precise document size recognition through the varied patch densities.
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
The solution effectively enhances the precision of document size recognition by utilizing a shading pattern with varying patch densities and a detector, reducing the likelihood of erroneous size detection and improving the accuracy of document size identification.
Implementation Method 1
a detector that detects a density of the shading pattern and that outputs an output signal for document size recognition
Data Source
AI summary
A document transport device includes a placement portion, a slide member, a movable piece, and a detector. A document is to be placed on the placement portion. The slide member includes a document guide that contacts one lateral side of the document which is placed on the placement portion. The movable piece is provided to the slide member, and includes a shading pattern composed of plural patches that have plural densities corresponding to plural document sizes and having plural adjacent patch density differences that are different from each other. The detector detects a density of the shading pattern, and outputs an output signal for document size recognition.