Multi-feed Detection Ultrasonic Transmitter Phase Control
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Solution Overview
Problem
Existing multi-feed detection devices face challenges in accurately detecting overlapping sheets of paper due to variations in frictional resistance caused by humidity, leading to inaccurate ultrasonic wave interference and intensity measurement, especially when the ultrasonic transmitter is not diagonally disposed with respect to the substrate.
Innovation Solution
A multi-feed detection device featuring an ultrasonic transmitter with arrayed elements transmitting ultrasonic waves with different phases diagonally intersecting the substrate's thickness direction, and an ultrasonic receiver with multiple receiving elements that output signals based on the strongest intensity, allowing for precise detection of overlapping sheets without requiring precise angular alignment of the transmitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ultrasonic transmitter is installed diagonally with respect to the substrate to reduce wave interference, then the detection accuracy improves, but the installation complexity and angular precision requirements increase
Solution Approach 1:
The ultrasonic transmitter is divided into multiple independent ultrasonic elements arranged in an array. Each element can be controlled independently to transmit ultrasonic waves with different phases, allowing the system to achieve diagonal wave transmission without requiring the entire transmitter to be installed at a precise diagonal angle relative to the substrate.
Solution Approach 2:
The system changes the phase parameters of ultrasonic waves transmitted from different elements in the array. By controlling the phase difference between adjacent elements, the system can direct ultrasonic waves at various angles including diagonal directions, eliminating the need for precise mechanical angular installation of the transmitter.
2Ease of manufacture
If the ultrasonic transmitter is disposed parallel or at right angle to the substrate for easy installation, then the ease of manufacture improves, but the ultrasonic wave interference increases leading to reduced detection accuracy
Solution Approach 1:
The system uses electronic phase control to dynamically adjust the direction of ultrasonic wave transmission. Instead of relying on fixed mechanical angular positioning, the phase differences between array elements are electronically controlled to achieve diagonal wave transmission, combining ease of installation with high detection 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 accurate detection of overlapping sheets by reducing ultrasonic wave interference and allowing for high-accuracy installation of the ultrasonic transmitter, even when not diagonally disposed, thereby improving the reliability of multi-feed detection in electronic devices.
Implementation Method 1
an ultrasonic transmitter transmitting an ultrasonic wave... the ultrasonic transmitter has arrayed ultrasonic elements and transmits ultrasonic waves with different phases from the ultrasonic elements
Implementation Method 2
When the ultrasonic wave reciprocates between the ultrasonic transmitter and the medium, the ultrasonic wave transmitted from the ultrasonic transmitter and the reciprocating ultrasonic wave interfere with each other
Implementation Method 3
When the medium is irradiated with the ultrasonic wave, a portion of the ultrasonic wave reflects on the medium, and a portion of the ultrasonic wave is absorbed by the medium. Further, a portion of the ultrasonic wave passes through the medium. As the number of media increases, the ultrasonic wave is absorbed by the medium and thus an intensity of the ultrasonic wave passing through the medium decreases
Implementation Method 4
When the medium is irradiated with the ultrasonic wave, a portion of the ultrasonic wave reflects on the medium... When the ultrasonic wave reciprocates between the ultrasonic transmitter and the medium
Data Source
AI summary
A multi-feed detection device includes a transmission circuit substrate to which an ultrasonic transmitter transmitting an ultrasonic wave is installed, and an ultrasonic receiver receiving the ultrasonic wave. The ultrasonic transmitter has arrayed ultrasonic transmission elements and transmits ultrasonic waves with different phases from the ultrasonic transmission elements to transmit the ultrasonic waves in a direction diagonally intersecting a thickness direction of the transmission circuit substrate.