High-Frequency RFID Printer Magnetic Coupler Design
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Solution Overview
Problem
RFID printers lack efficient high-frequency magnetic coupling mechanisms for writing to and reading RFID transponders along a web path, leading to inadequate magnetic field uniformity and interference with transponders not aligned with the coupler.
Innovation Solution
A high-frequency magnetic coupler with elongate inductors and magnetizable cores, positioned near the print head, capable of radiating or receiving magnetic energy to align with transponders, and a grounded conductor to prevent upstream interference, ensuring uniform magnetic fields and precise coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high frequency magnetic coupler is used to write to and read RFID transponders along a web path, then data transfer efficiency is improved, but magnetic field interference with transponders not aligned with the coupler increases
Solution Approach 1:
The magnetic coupler is designed with an elongate inductor configuration that concentrates magnetic flux in a localized region along the web path. By positioning the coupler to interact with only one transponder at a time and using the elongate geometry to define a specific interaction zone, the system achieves selective coupling that improves data transfer efficiency while minimizing interference with other transponders on the web.
2Measurement precision
If magnetic energy radiation level is increased to improve coupling with transponders, then data reading accuracy is improved, but interference with upstream and downstream transponders increases
Solution Approach 1:
A grounded conductor is introduced as an intermediary element positioned between the magnetic coupler and the web path. This conductor acts as a magnetic shield that redirects and contains magnetic flux, allowing the coupler to radiate sufficient magnetic energy for accurate data reading while preventing excessive magnetic energy from reaching and interfering with upstream and downstream transponders.
3Device complexity
If a single inductor is used to simplify the coupler structure, then device complexity is reduced, but magnetic field uniformity across the web path deteriorates
Solution Approach 1:
The magnetic coupler employs a plurality of inductors arranged in series along the web path rather than a single inductor. This segmentation allows each inductor to contribute to creating a uniform magnetic field across different sections of the web path, ensuring consistent coupling performance with transponders at various positions while maintaining a relatively simple overall structure.
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
Enables efficient, one-at-a-time writing and reading of RFID transponders with improved magnetic field uniformity across the web path, reducing interference and enhancing data transfer accuracy.
Implementation Method 1
the coupler including at least one inductor capable of radiating or receiving magnetic energy
Implementation Method 2
each inductor having a magnetizable core and an energizable winding surrounding the core
Implementation Method 3
at least one grounded conductor be positioned upstream of the core(s) to diminish magnetic radiation to transponders upstream of the conductor(s)
Data Source
AI summary
There is disclosed a printer having a print head and a high frequency magnetic coupler to magnetically couple with high frequency RFID transponders in a web at or near the print head. The coupler couples magnetically to only one transponder at a time that is generally aligned with one or more inductors, and magnetic radiation from the inductor(s) may be at least partly shielded from upstream transponders, and a grounded conductor in the upstream side of the coupler diminishes radiation to upstream transponders. One embodiment includes spaced inductors disposed along a generally transverse line across the web, and in another embodiment an elongate inductor extends along a line generally transverse of the web.