High Frequency RFID Printer Magnetic Coupler Alignment
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Solution Overview
Problem
Existing RFID printers lack efficient high-frequency RFID transponder reading and writing capabilities, particularly in aligning magnetic couplers with transponders to minimize magnetic interference and ensure accurate data transfer.
Innovation Solution
A printer with a high-frequency magnetic coupler featuring inductors with magnetizable cores and energizable windings, positioned near the print head, that can magnetically couple with RFID transponders one-at-a-time, using a grounded conductor to diminish upstream interference and multiple inductors connected in series for enhanced alignment and data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a high-frequency magnetic coupler is used to read and write RFID transponders, then data transfer capability is improved, but magnetic interference increases affecting transponders not aligned with the coupler
Solution Approach 1:
The magnetic coupler is designed to concentrate magnetic energy locally at the core alignment position, creating a focused magnetic field that selectively couples with transponders at that specific location while minimizing interference with transponders at other positions along the web path
Solution Approach 2:
The patent converts the potentially harmful magnetic interference into a beneficial selective coupling mechanism by positioning the coupler to create a controlled magnetic field that reads and writes only the transponder currently aligned with the core, transforming what would be interference into precise data transfer capability
2Measurement precision
If the coupler is positioned to align with transponders for data transfer, then reading and writing accuracy is improved, but the complexity of positioning and alignment increases
Solution Approach 1:
The magnetic coupler system utilizes the natural movement of the web carrying transponders through the printer to automatically bring them into alignment with the core, eliminating the need for complex active positioning mechanisms. The system self-regulates alignment through the web's longitudinal movement
Solution Approach 2:
The core acts as an intermediary element that mediates between the magnetic field generation and the transponder data storage, providing a stable reference point for alignment while simplifying the coupling mechanism through its fixed position relative to the moving web
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 precise and efficient reading and writing of RFID transponders aligned with the coupler, reducing magnetic interference and ensuring reliable data transfer across the web path, while maintaining alignment with the core for effective magnetic energy radiation.
Implementation Method 1
each inductor having a magnetizable core and an energizable winding surrounding the core, and the coupler being disposed to radiate or receive magnetic energy
Implementation Method 2
each inductor having a magnetizable core and an energizable winding surrounding the core
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 ground conductor in the upstream side of the coupler diminishes radiation to upstream transponders.