Soap Dispenser Refill Authentication Using Fluorescent Taggant Ink
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Solution Overview
Problem
Existing authentication systems for refillable dispensers are either costly, lack versatility, or are easily replicable, making them insecure and unsuitable for low-cost, small-scale, battery-powered devices.
Innovation Solution
A dispenser system using taggant ink on the refill's external surface, illuminated by a light source of a specific wavelength, with a sensor and control circuit to detect the ink's emitted light and verify authenticity, preventing operation if the refill is not authentic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a magnet and reed switch system is used for authentication, then the system is simple and cost-effective, but it is easily replicated by unauthorized refills and lacks versatility
Solution Approach 1:
The patent applies fluorescent ink with specific emission wavelengths that change color characteristics under UV illumination. Each authentic refill contains ink with a unique fluorescent signature that is extremely difficult to replicate, providing secure authentication while maintaining cost-effectiveness and versatility across different refill types.
Solution Approach 2:
The system uses ink with specific fluorescent parameters (emission wavelength, intensity ratio) that serve as authentication credentials. The control circuitry compares measured fluorescent parameters against stored reference values, enabling reliable detection of authentic versus unauthorized refills while allowing differentiation between various authorized refill types.
2Reliability
If RFID tags are used for authentication, then authentication security is improved, but the cost increases significantly
Solution Approach 1:
The patent replaces expensive RFID tags with inexpensive fluorescent ink applied directly to the refill surface. The ink serves as a disposable authentication element that is integrated into the refill manufacturing process itself, eliminating the need for separate electronic components and significantly reducing per-unit costs while maintaining security.
Solution Approach 2:
The patent substitutes electronic RFID authentication with an optical authentication system using fluorescent ink and UV illumination. This replacement eliminates complex electronic components, power requirements, and communication protocols, simplifying the system while reducing costs and improving reliability.
3Reliability
If bar-code scanning systems are used for authentication, then authentication capability is provided, but the system size and complexity increase
Solution Approach 1:
The patent uses fluorescent ink that emits light at specific wavelengths when illuminated by UV light. This optical property provides authentication capability without requiring complex scanning mechanisms, as the fluorescent signature can be detected by simple photodetectors, significantly reducing system size and complexity compared to bar-code systems.
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
Provides a secure, cost-effective, and versatile authentication method that is difficult to replicate, with low ink usage and minimal additional costs, allowing for differentiation of various refills based on unique ink signatures.
Implementation Method 1
the light source having a first wavelength and the ink being arranged to cause the ink to emit light at a second different wavelength
Implementation Method 2
a sensor to receive light emitted by the ink upon illumination by the light source
Data Source
Figure 1
Figure 2
AI summary
A dispenser for dispensing a product, the dispenser comprising a base unit (2) into which a refill (1) containing the product is removably insertable in a fixed position. The refill has a taggant ink (12) on part of its external surface. The base has a light source (13) to illuminate the ink. The light source has a first wavelength and the ink is arranged to cause the ink to emit light at a second different wavelength. A sensor (14) receives light emitted by the ink upon illumination by the light source. A control circuit receives signal indicative of the wavelength of the detected light from the sensor, compares it with stored data, and prevents operation of a dispensing mechanism unless the refill is authentic.