Contactless Magnetic Sensor for Wear-Free Coding Field Reading
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Solution Overview
Problem
Existing methods for reading information from magnetic carriers are prone to read errors due to improper relative speed and require contact, which leads to wear and complex gap maintenance, and are not fault-tolerant to movements.
Innovation Solution
A method involving a magnetically sensitive sensor device that aligns with the coding field at a specific distance, senses information without relative movement, and uses reference information to qualify the sensing result, employing sensors like Hall, MR, or Squid sensors to read magnetic information without contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inductive scanning with relative motion is used, then magnetic information can be read, but read errors occur due to speed constraints and wear from contact
Solution Approach 1:
The patent replaces the mechanical inductive scanning system with a magnetic field-based sensing system. Instead of using coils that require relative motion to induce current, the invention uses magnetically sensitive sensors (such as Hall sensors, MR sensors, or Squid sensors) that can detect magnetic field distributions directly without requiring mechanical movement or contact. This substitution eliminates wear from contact and removes the speed constraints inherent in inductive scanning.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the magnetic carrier and the sensor. The magnetically sensitive sensor detects the magnetic field distribution generated by the magnetic carrier, allowing information transfer without direct contact or relative motion. This field-based intermediary enables contactless, wear-free reading while maintaining high reliability.
2Ease of operation
If contact is made between sensor and carrier, then reading can be performed, but wear increases on both components
Solution Approach 1:
The patent replaces mechanical contact-based reading with a magnetic field-based detection system. Magnetically sensitive sensors detect the magnetic field distribution without requiring physical contact with the magnetic carrier, thereby eliminating wear on both the sensor and carrier while maintaining full reading capability.
Solution Approach 2:
The magnetic field serves as an intermediary that transfers information from the magnetic carrier to the sensor without requiring direct contact. This allows the sensor to read information through the magnetic field while maintaining a gap, thus preventing wear on both components.
3Loss of substance
If complex measures are taken to maintain narrow gap without contact, then wear is reduced, but device complexity increases
Solution Approach 1:
The patent replaces the need for complex mechanical gap maintenance systems with a magnetic field-based sensing approach. Since magnetically sensitive sensors can detect magnetic fields through gaps without contact, the complex measures previously required to maintain precise narrow gaps are no longer needed, reducing device complexity while maintaining wear reduction.
4Productivity
If high sampling rate is required to capture large information, then more data can be read, but relative movement precision must be controlled
Solution Approach 1:
The patent replaces the mechanical scanning system with a magnetic field-based sensing system that can capture the entire magnetic field distribution simultaneously or at very high rates. This eliminates the need for precise relative movement control while enabling high sampling rates, as the sensor array can detect multiple points in parallel without requiring precise mechanical positioning.
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
Ensures high-quality, fault-tolerant, and contactless reading of magnetic information, independent of relative movements, allowing for high sampling rates and accurate data capture without wear.
Implementation Method 1
a magnetically sensitive sensor device is used for reading the information
Implementation Method 2
employing sensors like Hall, MR, or Squid sensors to read magnetic information
Implementation Method 3
Aligning the sensor device relative to the coding field such that a sensor device field of view captures at least a part of the information-containing sub-area
Data Source
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AI summary
The invention relates to a method for reading information from a one- or multi-dimensional coding field (2), wherein the information is stored within boundaries (3) of the coding field (2) and wherein the information is present in the one- or multi-dimensional coding field (2) by means of a magnetic and/or magnetizable medium (4) and a magnetically sensitive sensor device (5) is used for reading the information, comprising the steps: a) locally bringing the one- or multi-dimensional coding field and the sensor device (5) together at a distance (d) less than or equal to a maximum sensing distance (dmax); b) aligning the sensor device (5) relative to the coding field (2) such that a sensor device field of view (8) detects at least a partial area (9) of the one- or multi-dimensional coding field (2) containing a part of all the required (to be sensed) information (alignment position);c) Sensing all required information at once or sequentially in at least one suitable alignment position using the sensor device (5) in at least one or more point detections, line detections and/or at least one matrix detection for all required information (to be detected); d) wherein the detection of the required data during the detection read operation is carried out in such a way that no read-relative movement of a point, line or matrix sensor of the sensor device relative to the coding field is performed.