RFID Printer Void Detection and Selective Communication
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Solution Overview
Problem
Current RFID printer-encoder systems face challenges in selectively communicating with closely spaced RFID transponders, leading to errors and system complexity, especially when dealing with defective transponders that can disrupt the printing and encoding process.
Innovation Solution
A printer controller system that includes a void detection system to identify defective RFID transponders, a printing system to manage the printing process, and a communication system to notify downstream devices, allowing for continuous media advancement and substitution of void indicia, enabling efficient handling of defective transponders without interrupting the printing operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple passive RFID transponders are within the range of the same RF electromagnetic field, then wireless data acquisition and transmission is enabled, but errors in reading and writing to specific RFID transponders occur due to interference
Solution Approach 1:
The patent applies segmentation by dividing the RF electromagnetic field into multiple zones using RF-shielded housings for each transponder. This creates isolated communication channels where each transponder can be read and written without interference from neighboring transponders, resolving the contradiction between handling multiple transponders and maintaining reading/writing accuracy.
Solution Approach 2:
The patent introduces RF-shielded housings as intermediary structures between the transceiver and individual RFID transponders. These housings act as mediators that allow selective communication with specific transponders while blocking interference from others, enabling reliable data transmission even when multiple transponders are present in the system.
2Reliability
If RF-shielded housings are used to isolate specific RFID transponders, then reading and writing errors are prevented, but the system becomes complex and requires significant spatial separation
Solution Approach 1:
The patent merges the RF-shielded housing with the physical structure of the label or tag itself, integrating the shielding function into the existing components rather than adding separate shielding structures. This reduces overall system complexity while maintaining the reliability benefits of isolated transponder communication.
3Productivity
If RFID transponders are closely spaced on media rolls, then printing efficiency is improved, but selective communication with individual transponders becomes difficult without concurrent communication with neighboring transponders
Solution Approach 1:
The patent applies segmentation by providing each closely-spaced RFID transponder with its own RF-shielded housing, allowing individual selective communication even when transponders are densely packed on media rolls. This enables high printing efficiency while maintaining ease of selective transponder operation.
4Productivity
If anti-collision management techniques are used to handle multiple RFID transponders, then near simultaneous reading and writing is enabled, but system complexity, cost, and response delay increase
Solution Approach 1:
The patent replaces complex anti-collision management software algorithms with physical segmentation using RF-shielded housings. This hardware-based isolation achieves simultaneous processing of multiple transponders without the computational complexity and response delays associated with anti-collision protocols.
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 system effectively detects and handles defective RFID transponders, ensuring minimal disruption to the printing process, allowing for uninterrupted operation and preventing the use of improperly encoded transponders, while maintaining high selectivity in communicating with multiple types of RFID transponders.
Implementation Method 1
the RFID transponder is exposed to an RF electromagnetic field by the transceiver that couples with and energizes (if passive) the RFID transponder through electro-magnetic induction
Implementation Method 2
UHF radio frequency identification (RFID) technology allows wireless data acquisition and or transmission from and or to active (battery powered) or passive RFID transponders using a backscatter technique
Data Source
AI summary
A printer controller system for controlling printing on media (e.g., a strip of labels) supporting a series of RFID transponders and for communicating detection of void RFID transponders to downstream devices. The printer controller system includes a void detection system for detecting void RFID transponders, a printing system for controlling printing to the media and a void communication system for communicating detection of the void RFID transponder to downstream devices. This allows the downstream device, such as a label peeler, to anticipate the void RFID transponder and deal with it accordingly. The printer controller may include a media advancement system that is configured to continue advancing the media and RFID transponders past the print head even when the RFID transponder is detected and avoid slowing the printing process. The printer controller system may be configured to submit void indicia to a print head and recommunicate a formatted image when a RFID transponder has been voided.