Watch Crown Mechanism for RFID Tag Access
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Solution Overview
Problem
Watches with metal cases and built-in RFID tags face challenges in maintaining case strength, appearance design, and information leakage due to the need for slits to radiate radio waves, which compromise security and aesthetics.
Innovation Solution
A watch design featuring a metal case with a through-hole and a crown that can be opened to allow a reader device to access the RFID tag without slits, using a shank and head mechanism to control communication and prevent information leakage, while maintaining case strength and design integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a slit is disposed on the back surface of the metal case to radiate radio waves from the RFID tag, then the radio wave transmission is improved, but the strength of the case is reduced
Solution Approach 1:
The invention divides the case into multiple regions: a first region with a through-hole for radio wave transmission and a second region without a through-hole for maintaining strength. This segmentation allows the case to have both radio wave transmission capability and structural strength by distributing the through-holes only in specific areas rather than compromising the entire case structure.
2Reliability
If a slit is disposed on the back surface of the metal case to radiate radio waves from the RFID tag, then the radio wave transmission is improved, but the appearance design is restricted
Solution Approach 1:
The invention applies local quality by creating through-holes only in a specific first region of the case while leaving the second region intact. This allows the majority of the case surface to maintain its original appearance design, while only a localized area is modified for radio wave transmission, thus minimizing impact on overall aesthetics.
3Ease of operation
If the RFID tag information is constantly readable from the outside through the slit, then the accessibility is improved, but the information leakage risk increases
Solution Approach 1:
The invention makes the case dynamic by providing a movable cover that can switch between an open state (allowing radio wave transmission and tag reading) and a closed state (blocking radio waves and preventing information leakage). This dynamic mechanism allows the system to adapt between accessibility and security requirements based on operational needs.
4Strength
If no through-hole is provided in the case, then the case strength and appearance are maintained, but the radio wave transmission from the RFID tag is blocked
Solution Approach 1:
The invention introduces a movable cover as an intermediary element that mediates between the need for radio wave transmission and the need to maintain case integrity. The cover acts as a controllable interface that allows radio waves to pass through when open while maintaining the enclosed structure when closed, thus enabling both functions without compromising the case itself.
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 prevents case strength reduction, appearance design restrictions, and information leakage by allowing secure and efficient reading of the RFID tag without slits, enhancing communication through electromagnetic field coupling and booster functionality.
Implementation Method 1
radio waves transmitted from an RFID tag are radiated through the slit to the outside
Data Source
AI summary
A watch with a built-in tag that includes a display displaying a time, a metal case having a through-hole in a side surface, a metal crown disposed to enable opening and closing of the through-hole, and a wireless communication device housed inside the case. The crown includes a head located outside the case and coming into contact with the case to close the through-hole, and a shank extending to the inside of the case through the through-hole with one end portion connected to the head and the other end portion located inside the case. When the head of the crown is pulled in a direction away from the case, the head of the crown becomes contactless with the case to enable a reader device located outside the case to read information of the wireless communication device through the crown.