RFID Tag Shielding Mechanism for Tool Tracking
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Solution Overview
Problem
Current methods for detecting tools left in workpieces, such as RFID tags, are inadequate for tools with unusual shapes or small sizes, as they can be difficult to attach and may be damaged, and do not effectively prevent communication with remote RFID readers when not in use.
Innovation Solution
A device with a movable RFID tag positioned within a body that includes a biasing member and a magnet, where the magnet's force overcomes the biasing force to move the RFID tag away from a window when a tool is present, shielding it from RF signals, and a visible label for identification when not in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an RFID tag is attached to a tool, then the tool can be tracked and detected, but the tag may be damaged or difficult to attach on tools with unusual shapes or small sizes
Solution Approach 1:
The system separates the RFID tag from the tool itself. The tag is placed inside a protective housing or container rather than being directly attached to the tool surface. This segmentation allows the tag to be protected from damage and easily replaced without modifying the tool, resolving the contradiction between reliable tracking and ease of attachment.
Solution Approach 2:
An intermediary structure (housing, container, or holder) is introduced between the RFID tag and the tool. This intermediary protects the fragile tag from mechanical damage while still allowing RF signal transmission, and provides a robust attachment mechanism that doesn't depend on the tool's surface characteristics.
2Ease of operation
If the RFID tag is always visible and accessible, then communication with remote RFID readers is always possible, but the tag cannot be shielded when the tool is in use to prevent false detections
Solution Approach 1:
The system transitions from a static tag position to a dynamic configuration where the tag can be moved between visible and shielded positions. The tag is mounted on a movable mechanism (slide, door, or rotating element) that allows it to be exposed for communication and hidden during tool operation, resolving the contradiction between ease of communication and detection accuracy.
Solution Approach 2:
The housing or container has different properties in different regions: one side is transparent or has an RF-transparent window for communication, while other sides are shielded with RF-blocking material. This local differentiation allows the tag to be accessible for reading while protected from external readers during tool use.
3Reliability
If a shield is added to prevent RF signals from reaching the tag, then false detections are prevented, but the device complexity increases
Solution Approach 1:
The system uses thin RF-shielding films or flexible conductive materials instead of bulky rigid shields. These thin films can be integrated into the housing walls or applied as coatings, providing effective RF blocking while adding minimal complexity and weight to the overall structure.
Solution Approach 2:
The shielding function is merged with the existing housing or container structure rather than being added as a separate component. The housing serves dual purposes: protecting the tag physically and blocking RF signals, thereby reducing overall device complexity while maintaining 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
Effectively detects the presence of tools by preventing communication with remote RFID readers when tools are nearby, ensuring accurate tracking and preventing damage from foreign objects, while allowing visibility and communication when tools are not present.
Implementation Method 1
A magnet is positioned within the interior space and is configured to apply a second force in a second direction to the RFID tag when the body is in the presence of the tool
Implementation Method 2
A biasing member is positioned within the interior space to apply a first force in a first direction to the RFID tag
Implementation Method 3
A shield in the interior space prevents passage of at least one of RF signals from the RFID reader into the interior space and RF signals from the RFID tag out of the interior space
Data Source
AI summary
A device to detect a presence of a tool by responding to a remote RFID reader. The device includes a body that forms an interior space therein with the body having a window into the interior space. An RFID tag is positioned within the interior space. A biasing member is positioned within the interior space to apply a first force in a first direction to the RFID tag. A magnet is positioned within the interior space and is configured to apply a second force in a second direction to the RFID tag when the body is in the presence of the tool. The RFID tag is movable between first and second positions within the interior space. One of the first and second positions including the RFID tag aligned with the window. The other of the first and second positions including the RFID tag positioned away from the window.