NFC Timepiece Magnetic Screen for Signal Reliability
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Solution Overview
Problem
Timepieces equipped with near-field communication devices often suffer from reliability issues due to electromagnetic disturbances caused by metallic components, leading to malfunctions in signal connection and maintenance challenges.
Innovation Solution
Incorporating a magnetic screen with high magnetic permeability and low magnetic losses between the communication device and metallic components to isolate the magnetic field, thereby reducing signal attenuation and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the communication device is integrated into metallic components of the timepiece, then the device can be compactly arranged, but electromagnetic disturbances occur leading to reduced reliability
Solution Approach 1:
A magnetic screen made of ferrite material is introduced as an intermediary element between the communication device and metallic components. This magnetic screen absorbs and redirects magnetic field lines, preventing direct interaction between the NFC antenna and metallic parts that would cause electromagnetic disturbances. The magnetic screen thus mediates the spatial relationship, allowing compact integration while maintaining communication reliability.
Solution Approach 2:
The magnetic screen changes the magnetic field distribution parameters in the vicinity of the communication device. By introducing a material with high magnetic permeability (ferrite), the magnetic field lines are redirected and concentrated within the magnetic screen rather than interacting with metallic components. This parameter change in magnetic field distribution eliminates the harmful electromagnetic effects while preserving device compactness.
2Reliability
If a large antenna is used to overcome electromagnetic disturbances, then communication reliability improves, but the integration becomes complex and maintenance difficult
Solution Approach 1:
Rather than enlarging the antenna, the patent introduces a magnetic screen as an intermediary protective element. This approach maintains the original antenna size and integration simplicity while effectively blocking electromagnetic disturbances. The magnetic screen provides the necessary protection without adding integration complexity or maintenance burden.
3Volume of moving object
If the communication device is placed close to metallic components, then space is saved, but signal attenuation increases due to electromagnetic interference
Solution Approach 1:
The magnetic screen serves as a protective intermediary that allows the communication device to remain in close proximity to metallic components without suffering signal attenuation. The ferrite material absorbs and redirects magnetic field lines, preventing energy loss through electromagnetic interference while maintaining compact device spacing.
Solution Approach 2:
The magnetic screen modifies the magnetic field parameters in the space between the communication device and metallic components. By introducing high permeability ferrite material, the magnetic field is redirected and concentrated, reducing signal attenuation and energy loss while preserving compact device arrangement.
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
The magnetic screen enhances the reliability and sensitivity of radio signal transmission and reception by isolating the communication device from metallic components, reducing electromagnetic interference and facilitating easier maintenance.
Implementation Method 1
The magnetic screen 8 also called magnetic shielding element has a magnetic permeability adapted to the frequency bands of the magnetic field generated by the communication device 4
Implementation Method 2
the magnetic screen 8 is able to separate the timepiece 35 into two zones, a first zone comprising the magnetic fields generated by the communication device 4 and a second zone which is not exposed to these magnetic fields
Implementation Method 3
low magnetic losses μ′′ with μ′′ < 0.5 and an electrical resistivity greater than 1000 KΩ/m
Data Source
Figure 1~6
Figure 7~8
Figure 9~10
AI summary
The invention relates to a timepiece provided with a dial and/or a bezel comprising a near field communication device capable of receiving/transmitting a signal, said communication device being arranged at the level of the dial or the bezel of said timepiece and being associated with a magnetic screen in particular made of ferrite.