RFID Checkout Cavity Shielding for Liquid Item Tag Reading
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Solution Overview
Problem
Existing RFID tag reading devices are inefficient, particularly when used with objects containing liquids or certain fruits/vegetables, as they struggle to effectively read tags due to interference from external sources and wave disturbances.
Innovation Solution
A device with a deposit cavity surrounded by protective walls that attenuate waves, featuring an introduction orifice and an access opening, which reduces external interference and enhances wave power for effective RFID tag reading/writing, regardless of the object type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID reading devices are used without protective shielding, then reading speed may be faster in open environments, but reading effectiveness fails for objects containing liquids due to wave interference
Solution Approach 1:
The patent converts the harmful wave interference into a beneficial contained electromagnetic environment. The cavity structure with conductive walls and absorbing material transforms external electromagnetic noise into a controlled reading zone, where interference is converted into focused reading capability for liquid-containing objects
Solution Approach 2:
The cavity structure acts as an intermediary between the RFID reader and the tags on liquid-containing objects. The conductive walls and absorbing material serve as mediating elements that filter and condition electromagnetic waves, allowing effective communication through objects that would otherwise block signals
2Reliability
If external wave interference is blocked using shielding, then reading effectiveness improves, but device complexity increases due to additional shielding structures
Solution Approach 1:
The cavity structure serves multiple functions simultaneously: it provides mechanical support for the reader, creates electromagnetic shielding, contains absorbing material to reduce interference, and defines the reading zone. This multi-functionality reduces overall device complexity compared to separate shielding components
Solution Approach 2:
The cavity is formed using thin conductive walls and absorbing material layers that provide effective shielding without adding significant bulk or complexity. The flexible implementation allows the shielding to be integrated into the reader housing without requiring heavy or complex structures
3Productivity
If RFID tags are read simultaneously from multiple directions, then reading speed increases, but wave interference from multiple sources creates reading errors
Solution Approach 1:
The cavity structure extracts and isolates the electromagnetic reading process from external interference sources. By containing the reading zone within shielded walls, the system can perform simultaneous multi-directional reading without external waves creating interference patterns that would cause errors
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 device enables rapid and efficient reading/writing of RFID tags, even on objects with liquids, by minimizing wave interference and increasing power, thus improving reading efficiency compared to conventional systems.
Implementation Method 1
at least one wall, called protection, arranged around said introduction orifice, extending upwards from said introduction orifice and capable of performing wave attenuation between said deposition cavity and the exterior
Implementation Method 2
at least one RFID read/write means... capable of emitting waves in said cavity and/or receiving waves from RFID tags present in said cavity
Data Source
Figure 1
Figure 2~3
AI summary
The device (102) has a depositing cavity for receiving an object and comprising a bottom wall and a side wall, and a radio frequency identification (RFID) reading/writing unit. An insertion aperture (106) deposits objects in the cavity. The aperture is formed in a top part of the depositing cavity. Protective walls (108-112) are arranged around the aperture. Each wall extends upward from the aperture and attenuates waves between the cavity and the outside. An access opening (116) accesses the aperture through the walls. An independent claim is also included for an assembly comprising a collection terminal and a payment device.