Perpendicular Ultrasonic Sensor for Double Sheet Detection
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Solution Overview
Problem
Conventional ultrasonic sensors for detecting double sheets in automatic teller machines require a large installation space due to diagonal arrangement of ultrasonic wave generators and receivers, leading to increased apparatus volume and reduced space utilization.
Innovation Solution
The ultrasonic sensor is configured with an ultrasonic wave generator and receiver facing each other perpendicular to the banknote transfer path, allowing for the determination of the periodicity of the reception signal to differentiate between zero, single, or double sheets based on signal generation or frequency, thereby reducing the apparatus volume and enhancing space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasonic wave generator and receiver are arranged diagonally to minimize reflective wave interference, then detection reliability is improved, but apparatus volume increases and space utilization deteriorates
Solution Approach 1:
The patent changes the spatial arrangement from diagonal (2D plane arrangement) to perpendicular (3D space utilization). The ultrasonic wave generator and receiver are positioned on opposite sides of the banknote transfer path in a perpendicular configuration, utilizing the third dimension (depth/height) rather than expanding in the horizontal plane. This dimensional change allows compact arrangement while maintaining detection effectiveness.
Solution Approach 2:
The patent employs asymmetric positioning where the ultrasonic wave generator and receiver are placed at specific perpendicular positions relative to the banknote transfer path, rather than symmetric diagonal placement. This asymmetric arrangement optimizes the ultrasonic wave transmission path to minimize reflective wave interference while maintaining compact apparatus dimensions.
2Volume of stationary object
If ultrasonic wave generator and receiver are arranged vertically perpendicular to transfer path, then space utilization is improved, but reflective wave interference may increase
Solution Approach 1:
The patent applies local quality by positioning the ultrasonic wave generator and receiver at specific localized positions perpendicular to the banknote transfer path. The generator is placed at one specific location and the receiver at another specific location, creating optimized local ultrasonic transmission zones that penetrate the banknotes effectively while minimizing reflective wave interference at those specific positions.
Solution Approach 2:
The patent converts the potential harmful effect of reflective waves into a beneficial detection mechanism. By analyzing the periodicity characteristics of received signals, the system can distinguish between direct transmission signals and reflective waves, using the reflective wave patterns themselves as additional information for accurate sheet count detection.
3Measurement precision
If diagonal arrangement is used to reduce reflective wave effect, then signal quality is improved, but installation space increases
Solution Approach 1:
The patent transitions from 2D diagonal arrangement to 3D perpendicular arrangement, utilizing the vertical dimension for ultrasonic wave transmission. This allows the generator and receiver to be positioned closer together in the horizontal plane while maintaining effective detection distance through vertical stacking, thereby reducing installation footprint while preserving signal quality.
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 detects double sheets, enhances banknote processing efficiency, and reduces the overall volume of the apparatus, improving the utilization of space in automatic teller machines.
Implementation Method 1
an ultrasonic wave generator and an ultrasonic wave receiver provided in pair to face each other in a direction perpendicular to a transfer direction of the banknotes with the transfer path for transferring the banknotes interposed therebetween
Implementation Method 2
periodicity of a reception signal detected by the ultrasonic wave receiver is determined to detect whether a zero sheet, a single sheet or double sheets of the banknotes pass through the transfer path
Data Source
AI summary
The present invention relates to an ultrasonic sensor for detecting double sheets and a method of detecting double sheets using the same, in which in configuring the ultrasonic sensor for detecting double sheets of banknotes passing through a transfer path, the ultrasonic sensor is configured to include an ultrasonic wave generator and an ultrasonic wave receiver provided in pair to face each other in a direction perpendicular to a transfer direction of the banknotes with the transfer path for transferring the banknotes interposed therebetween, and periodicity of a reception signal detected by the ultrasonic wave receiver is determined to detect whether a zero sheet, a single sheet or double sheets of the banknotes pass through the transfer path according to generation or not of the periodic signal and/or a frequency of the generation.