Contactless Recording Media Detection via Galvanic Sensor Decoupling
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Solution Overview
Problem
Existing methods for contactless detection of laminated, flat objects like recording media face challenges in reliably detecting single or multiple sheets across a broad weight range, often requiring complex constructions and learning processes, and are prone to disturbance variables and limited flexibility.
Innovation Solution
A sensor device with a galvanically and mechanically separated transmitter and receiver, allowing for independent power supply and placement on separate modules, uses frequency modulation and correction characteristics to enhance sensitivity and detect a wide range of weights without the need for complex comparison circuits or learning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex constructions with multiple sensors and comparison circuits are used, then detection reliability improves, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the comparison circuit from the detection system. By using a single sensor device with integrated evaluation electronics, the complex multi-sensor comparison architecture is replaced with a simplified single-sensor system that achieves equivalent or superior detection reliability through different technical means.
Solution Approach 2:
The patent replaces the mechanical/electrical comparison system (multiple sensors and comparison circuits) with an evaluation-based system using a single sensor. The evaluation electronics analyze the sensor signal directly, substituting the need for physical comparison hardware and reducing overall device complexity.
2Measurement precision
If ultrasonic frequency modulation is used, then receiver sensitivity increases, but disturbance variables affect detection
Solution Approach 1:
The patent implements feedback through the evaluation electronics that continuously monitor and analyze the sensor signal. The system evaluates the modulated ultrasonic frequency signal and uses this feedback information to distinguish between actual sheet presence and disturbance variables, maintaining sensitivity while rejecting noise.
Solution Approach 2:
The patent changes the ultrasonic frequency parameter through modulation. By modulating the ultrasonic frequency and evaluating the modulated signal, the system creates a distinctive signal signature that can be differentiated from disturbance variables, improving sensitivity while maintaining immunity to interference.
3Measurement precision
If learning processes are implemented, then detection accuracy improves, but productivity decreases
Solution Approach 1:
The patent incorporates preliminary action by integrating evaluation electronics that pre-process and evaluate sensor signals in real-time without requiring separate learning phases. The system is designed to accurately detect sheets from the start of operation, eliminating the need for productivity-reducing learning processes while maintaining high detection accuracy.
4Adaptability or versatility
If a broad gram weight range is detected, then adaptability improves, but measurement precision decreases
Solution Approach 1:
The patent uses parameter changes in the ultrasonic frequency modulation to maintain precision across a broad gram weight range. By modulating the frequency and evaluating the modulated signal characteristics, the system can distinguish between different sheet weights and types, achieving both broad adaptability and maintained precision through signal analysis rather than fixed thresholds.
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 solution increases receiver sensitivity, allows detection of a broader weight range (up to 6000 g/m2) without learning, and reduces disturbance levels, providing high detection security and economic advantages by simplifying the design and operation of sensor devices.
Implementation Method 1
uses ultrasonics
Implementation Method 2
there is both an amplitude evaluation and a phase evaluation
Data Source
AI summary
The invention relates to a method and a device for the contactless detection of laminated, flat objects, particularly sheet-like recording media. There is a galvanic separation and mechanical decoupling between the transmitter and receiver to improve detection. These measures can be further improved with correction characteristic methods.