Self-detachable RFID Tags with Inductive Charging
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Solution Overview
Problem
Existing RFID tags with batteries require frequent replacement or mechanical detachment, which is inefficient and limits self-checkout capabilities, especially in retail settings where secure detachment by customers is necessary.
Innovation Solution
RFID tags equipped with internal capacitors that can be inductively charged, allowing for self-detachment using a detaching signal from a POS device, eliminating the need for external power or mechanical tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If battery-assist RFID tags are used to extend detection range, then the read/visibility range is improved, but the batteries require periodic replacement which becomes challenging in large numbers of tags
Solution Approach 1:
The patent extracts the energy storage function from a battery and replaces it with an inductive charging system using a magnetic loop and capacitor. The tag receives energy wirelessly through electromagnetic induction from an external field, eliminating the need for physical battery replacement while maintaining extended detection range capability.
Solution Approach 2:
The patent replaces the mechanical battery replacement system with an electromagnetic induction system. Instead of physically accessing and replacing batteries, the tags are charged inductively through a magnetic loop that couples with an external electromagnetic field, enabling non-contact energy transfer and eliminating mechanical intervention.
2Ease of operation
If mechanical detaching of security tags is used, then the tags can be removed from items, but it requires trained personnel and does not allow full self-checkout process
Solution Approach 1:
The patent enables self-service detachment by providing customers with a detaching signal generator (such as a mobile device or handheld reader) that can communicate with the RFID tag. The tag contains a detaching unit that receives the signal and automatically activates to release the tag from the item, allowing customers to perform detachment themselves without trained personnel.
Solution Approach 2:
The patent introduces a detaching signal as an intermediary between the customer and the tag detachment mechanism. The signal mediates the detachment process by triggering the tag's internal detaching unit, which then activates the mechanical or electromagnetic release mechanism, simplifying the customer's interaction to just sending a signal.
3Strength
If RFID tags are made with hard plastic housing for mechanical attachment, then the attachment strength is improved, but the detachment process requires mechanical tools and trained personnel
Solution Approach 1:
The patent makes the attachment system dynamic by incorporating a controllable detaching unit that can change the attachment state from locked to released on demand. The hard plastic housing maintains structural strength for secure attachment, while the detaching unit (actuated by a received signal) dynamically alters the attachment mechanism to enable easy release, creating a system that is both strong and easily detachable.
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 secure, customer-driven detachment of RFID tags and extends read/visibility range by using stored energy for communication and detachment operations, facilitating self-checkout processes and reducing maintenance costs.
Implementation Method 1
inducing current through a magnetic loop or solenoid disposed within the RFID tag that is caused by a inductive field, a magnetic field or a Radio Frequency ('RF') field being generated within a surrounding environment; using the current which is induced through the magnetic loop or solenoid to charge a capacitor disposed within the RFID tag
Data Source
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AI summary
Systems and methods for operating an RFID tag. The methods comprise: inducing current through a magnetic loop or solenoid disposed within the RFID tag that is caused by a inductive field, a magnetic field or an RF field being generated within a surrounding environment; using the current which is induced through the magnetic loop or solenoid to charge a capacitor disposed within the RFID tag; decreasing the amount of current induced through the magnetic loop or solenoid; receiving a detaching signal at the RFID tag; electrically connecting the capacitor to a detaching unit disposed within the RFID tag in response to the detaching signal; and activating the detaching unit by supplying current from the capacitor to the detaching unit, whereby the RFID tag can be detached from an article.