RFID Checkout Scanning via Bag Segmentation and Dimensionality Change

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current UPC and RFID-based inventory tracking systems face challenges such as requiring a clear line of sight for barcode scanning, potential damage to barcodes, and difficulties in accurately detecting items near the center of shopping carts, leading to inefficiencies in checkout processes.

Innovation Solution

Implementing a system where items are pre-tagged with RFID tags and scanned using a multi-directional RFID scanner at a checkout station, allowing for simultaneous scanning of items within shopping bags without removing them, while optionally using UPC scanners as a backup for oversized items or damaged RFID tags.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional RFID-based scanning systems are used to scan entire shopping carts at once, then checkout speed is improved, but measurement precision deteriorates due to unreliable detection of items near the center of carts

Engineering Contradiction:

Improvecheckout speedVSAvoiditem detection accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The system divides the shopping cart contents into multiple shopping bags, and scans each bag individually rather than scanning the entire cart at once. This segmentation allows the RFID scanner to reliably detect items in each smaller volume while maintaining overall checkout efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system transitions from scanning items in three-dimensional space within a large cart volume to scanning items in a more confined one-dimensional path as bags are moved through the scanning zone. This dimensional change improves detection reliability.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Manufacturing precision

If UPC barcodes are used for item tracking, then manufacturing precision is improved with standardized codes, but ease of operation deteriorates due to requiring clear line-of-sight and proper orientation

Engineering Contradiction:

Improvebarcode standardizationVSAvoidscanning convenience

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The system replaces optical barcode scanning with RFID technology, substituting a mechanical/optical line-of-sight system with a radio frequency electromagnetic field system. This allows scanning without direct line-of-sight or proper orientation requirements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If items are scanned one at a time using UPC barcodes, then measurement precision is improved for each item, but productivity deteriorates due to slow checkout process

Engineering Contradiction:

Improveitem identification accuracyVSAvoidcheckout throughput

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The system merges multiple item identifications into a single scanning operation by reading RFID tags on multiple items simultaneously as they pass through the scanning zone, maintaining high identification accuracy while dramatically improving checkout throughput.

Inventive Principle:

Principle #5Merging (Combining)

4Ease of manufacture

If barcodes are used for item identification, then ease of manufacture is improved with simple printing, but reliability deteriorates due to damage preventing successful detection

Engineering Contradiction:

Improvebarcode application simplicityVSAvoiddetection success rate

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The system replaces fragile printed barcodes with more robust RFID tags that use electromagnetic fields for communication, making them resistant to physical damage while maintaining ease of application to items.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

This approach enhances the efficiency and accuracy of inventory tracking, reduces labor costs by allowing customers to bag items as they shop, and improves the shopping experience by streamlining the checkout process, ensuring reliable detection of all items and reducing theft through weight verification.

Implementation Method 1

Various item-tracking solutions using radio frequency identification (RFID) tags have been proposed as a substitute for using bar codes in supply chain management

Methodology Applied

Scientific EffectRadio frequency identification (RFID): Electromagnetic Induction

Data Source

PatentUS8448857B2Radio frequency identification system for inventory handling, tracking, and checkout

Publication Date: 2013.05.28 TOSHIBA GLOBAL COMMERCE SOLUTIONS HLDG

AI summary

One embodiment provides a method of handling for-sale items while shopping at a brick-and-mortar store, including inventorying, tracking, and scanning the for-sale items at checkout. Customers select and bag items while they shop. Each item includes an RFID tag uniquely identifying the item or category of item. The customer brings the shopping cart to an unloading zone of a checkout station. Another, empty shopping cart is positioned in an unloading zone. The customer may receive electronic guidance in positioning the shopping carts. As the customer moves the bags from the shopping cart in the unloading zone to the shopping cart in the loading zone, the bags are scanned by the RFID scanner without removing the items from the bags. Redundant RFID scanners may be provided to increase reliability, and a UPC scanner may be provided as a backup. The shopping carts at the loading zone and unloading zone may be weighed and the weights compared, to guard against possible theft of goods.