Portable RFID Terminal Visual Scan Trace Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
RFID reading systems face inefficiencies in localizing scanned items due to insufficient correlation between the RFID reader's location and orientation and the RFID tags, leading to high rates of unread tags in inventory management, requiring repeated scans of entire departments to ensure accuracy.
Innovation Solution
A portable RFID reading terminal equipped with a microprocessor, memory, RF antenna, display, two-dimensional imager, and accelerometer, which displays scan traces and reconciles item counts against expected lists by projecting RF signal coverage shapes onto physical structures, providing visual and audible feedback to operators and enabling precise tracking and inventory management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID reading systems are used without visual feedback mechanisms, then the system remains simple, but the operator cannot locate scanned items efficiently leading to high unread rates
Solution Approach 1:
The patent implements visual feedback by projecting the RF signal coverage shape onto the physical structure (shelf or floor) using a projector. This allows operators to see in real-time which areas have been scanned and which remain unread, enabling them to focus on unread items only. The feedback mechanism directly addresses the reliability issue by improving scan accuracy without requiring complex additional hardware beyond the projector and processing unit.
Solution Approach 2:
The patent introduces a projector as an intermediary device that translates the abstract RF signal coverage information into a visual representation on the physical structure. This intermediary allows the operator to correlate the scanned areas with the physical inventory locations, solving the localization problem without requiring complex augmented reality displays or other sophisticated interfaces.
2Reliability
If repeated scans of entire departments are performed to ensure accuracy, then inventory management reliability improves, but time consumption increases significantly
Solution Approach 1:
The patent enables local quality by allowing operators to focus scanning efforts only on specific unread areas identified through the visual projection feedback. Instead of scanning entire departments repeatedly, operators can target only the regions marked as unread on the projected image, significantly reducing scan time while maintaining high reliability through comprehensive coverage of all unread items.
Solution Approach 2:
The real-time visual feedback mechanism shows operators which areas have been scanned and which remain unread, enabling them to adjust their scanning path dynamically. This feedback loop eliminates redundant scanning of already scanned areas and ensures complete coverage of unread items in a single pass, reducing both time loss and maintaining reliability.
3Measurement precision
If the RF signal coverage shape is projected onto the physical structure, then spatial localization accuracy improves, but device complexity increases
Solution Approach 1:
The patent uses a projector as a simple intermediary device to achieve precise spatial localization. The projector takes the RF signal coverage shape data and visually represents it on the physical structure (shelf or floor), providing accurate spatial information without requiring complex display systems, sensors, or computational algorithms. This approach achieves high measurement precision with minimal added complexity.
Data Source
AI summary
A portable radio-frequency identifier (RFID) reading terminal can comprise a microprocessor, a memory, an RFID reading device, and a display. The portable RFID reading terminal can be configured to display a scan trace provided by a line comprising a plurality of time varying points. Each point can be defined by a projection of a radio frequency (RF) signal coverage shape of the RFID reading device onto a chosen plane at a given moment in time.