Bill Processing Machine Sensor Timing Coordination
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Solution Overview
Problem
Bill processing machines face a trade-off between cost and recognition accuracy, as increasing the number of pixels for better recognition increases costs, pattern reading time, and memory usage, limiting the number of bills that can be processed per unit time.
Innovation Solution
A bill processing machine employs a pair of sensor units with reflection sensors arranged in a line, where each sensor unit includes a light source and a light receiving element, and a control portion that coordinates the detection of reflected and transmitted lights from both sides of a bill, optimizing detection timing to achieve accurate recognition with fewer pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to improve recognition accuracy, then recognition accuracy is improved, but device cost, pattern reading time, and memory usage increase
Solution Approach 1:
The patent divides the sensor system into multiple sensor units, each with fewer pixels, that work together to achieve the recognition accuracy of a single high-pixel sensor. This segmentation reduces the pixel count per sensor while maintaining overall system performance.
Solution Approach 2:
The patent employs multiple sensor units with different pixel densities arranged in a nested configuration, where sensors with fewer pixels are positioned to detect specific features while complementary sensors detect other features, achieving high recognition accuracy without requiring all sensors to have high pixel counts.
2Measurement precision
If the number of pixels is increased to improve recognition accuracy, then recognition accuracy is improved, but pattern reading time increases
Solution Approach 1:
The patent segments the pattern detection task across multiple sensor units with fewer pixels each, allowing parallel or sequential processing that reduces the total pattern reading time while maintaining recognition accuracy through coordinated detection.
Solution Approach 2:
The patent uses sensors with pixel counts sufficient for their specific detection tasks rather than requiring all sensors to have excessive pixels, optimizing the balance between recognition accuracy and reading speed by applying partial action where each sensor performs its specific function efficiently.
3Measurement precision
If the number of pixels is increased to improve recognition accuracy, then recognition accuracy is improved, but memory usage increases
Solution Approach 1:
The patent segments the data storage requirement across multiple sensor units, each generating less data due to lower pixel counts. The total memory usage is reduced while maintaining recognition accuracy through the coordinated operation of multiple sensors detecting different features.
Solution Approach 2:
The patent extracts and processes only the essential features needed for recognition using multiple low-pixel sensors, rather than processing complete high-resolution images from a single high-pixel sensor, thereby reducing memory usage while maintaining recognition accuracy.
4Measurement precision
If sensors with many pixels are used to achieve better recognition, then recognition accuracy is improved, but the number of bills processed per unit time decreases
Solution Approach 1:
The patent segments the recognition task across multiple sensor units with fewer pixels each, enabling faster processing that increases the number of bills processed per unit time while maintaining recognition accuracy through coordinated detection of different features.
Solution Approach 2:
The patent applies partial action by using sensors with pixel counts optimized for their specific detection functions rather than using excessive pixels for all sensors, thereby increasing processing speed and the number of bills processed per unit time while maintaining sufficient recognition accuracy.
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 enables favorable recognition performance while reducing costs and pattern reading time, allowing for efficient processing of a higher number of bills per unit time.
Implementation Method 1
Each of the first and second reflection sensors includes a light source and a light receiving element
Implementation Method 2
first and second transmitted lights in one direction of the bill are detected by the first and second reflection sensors of the first sensor unit, respectively, and third and fourth transmitted lights in an other direction of the bill is detected by the first and second reflection sensor of the second sensor unit, respectively
Data Source
AI summary
A bill processing machine according to the present invention includes a control portion that controls a pair of first and second sensor units. The control portion performs: a first process in which first and second reflected lights of one face of a bill are detected sequentially by first and second reflection sensors of the first sensor unit, respectively; a second process in which third and fourth reflected light of an other face of the bill are detected sequentially by first and second reflection sensors of the second sensor unit, respectively; and a third process in which first and second transmitted lights in one direction of the bill are detected by the first and second reflection sensors of the first sensor unit, respectively, and third and fourth transmitted lights in an other direction of the bill is detected by the first and second reflection sensor of the second sensor unit, respectively. The control portion makes timing of detecting the first reflected light by the first reflection sensor of the first sensor unit in the first process agree with timing of detecting the fourth reflected light by the second reflection sensor of the second sensor unit in the second process.