Ceramic Key Shaft with Embedded RFID Antenna
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Solution Overview
Problem
Current RFID-based lock/key systems face challenges in contactless reading of 13.56 MHz RFID chips due to the interference from metal keys and difficulty in reading over the angular position, and existing solutions are inadequate in enhancing security against manipulation.
Innovation Solution
The key shank is made of technical ceramics with an embedded tungsten wire antenna, and the RFID chip is housed in a plastic loop, while a material query system checks the ceramic properties to ensure proper key insertion, using a hardened plate to release the tumbler mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal key is used with current RFID media at 13.56 MHz, then the key can be easily manufactured and handled, but the metal prevents contactless reading of the RFID chip
Solution Approach 1:
The key shaft is made of technical ceramic (non-conductive material) instead of metal, while the key bow remains plastic. This composite construction allows the RFID antenna to be embedded in the ceramic shaft, enabling contactless reading without metal interference, while maintaining ease of manufacture through standardized ceramic and plastic components
Solution Approach 2:
The technical ceramic shaft acts as an intermediary between the metal key bow and the RFID chip, providing a non-conductive path that allows electromagnetic signals to pass through for contactless reading while still providing structural support and housing for the antenna
2Ease of operation
If the RFID antenna is integrated into the key bow, then the reading distance and angle are improved, but the reading antenna in the cylinder core has difficulty reading the medium over this distance/angle
Solution Approach 1:
The RFID antenna is extracted from the plastic key bow and relocated to the technical ceramic key shaft. This positioning places the antenna closer to the lock's reading antenna in the cylinder core, improving magnetic coupling and reading reliability while maintaining ease of operation through contactless reading capability
3Ease of manufacture
If a plastic key shaft is used, then the key can be easily manufactured, but the material detection mechanism cannot verify ceramic properties such as hardness and smooth surface
Solution Approach 1:
The key consists of a plastic bow combined with a technical ceramic shaft. The ceramic shaft provides verifiable material properties (hardness, smooth surface) that the detection mechanism can verify, while the plastic bow provides ease of manufacture and housing for the RFID chip
Solution Approach 2:
Only the key shaft portion that interacts with the detection mechanism (the portion inserted into the cylinder core) is made of technical ceramic with verifiable properties, while the key bow remains plastic. This localized application of ceramic material provides security verification where needed without requiring the entire key to be ceramic
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 enables secure, contactless reading of RFID chips in metal-free ceramic keys, enhancing security and facilitating easy key insertion by verifying ceramic properties, thus improving the overall security and functionality of the lock/key system.
Implementation Method 1
a 13.56 MHz RFID chip is read contactlessly
Data Source
Figure 1~6
AI summary
The invention relates to a key for an electronic or mechatronic lock-key system, characterized in that the shaft of the key is made of a ceramic material and that an RFID antenna is embedded in it, which is conductively connected to an RFID chip arranged in the bow.