Integrated Optical-RFID Detection Layout for Accurate 2D Code Reading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing detection devices using RFID and two-dimensional codes lack integration and accuracy in detecting two-dimensional codes, leading to inefficiencies in both technologies.
Innovation Solution
A detection device integrating an optical sensor with a light guide plate, light sources, and an antenna coil, which enhances the detection of two-dimensional codes by improving light propagation and reducing interference between RFID and optical reading functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RFID reader and optical sensor are integrated in the same device, then both RFID and two-dimensional code detection functions are provided, but detection accuracy of two-dimensional code deteriorates due to interference between radio waves and light
Solution Approach 1:
The device is divided into distinct functional regions: an RFID reader section and an optical sensor section. The RFID reader includes an antenna for radio frequency communication, while the optical sensor includes a light guide plate and photodiodes for optical code detection. This spatial segmentation reduces electromagnetic interference between the two systems while maintaining both detection functions in a single integrated device.
Solution Approach 2:
A light guide plate serves as an intermediary component between the light source and the photodiodes. It guides and focuses light from the light source onto the photodiodes, improving the efficiency of optical signal transmission while isolating the optical path from radio frequency interference. The light guide plate acts as a mediator that enhances optical detection without being affected by RFID radio waves.
2Reliability
If antenna is positioned to overlap light guide plate or optical sensor, then RFID detection is improved, but light transmission and optical detection are blocked
Solution Approach 1:
The antenna is positioned in a different spatial dimension relative to the light guide plate and optical sensor. Specifically, the antenna is arranged in the horizontal plane while the light guide plate and optical sensor are arranged in the vertical plane. This dimensional separation allows the antenna to overlap with the light guide plate as viewed from one direction while maintaining proper light transmission paths from above, thus achieving both RFID reliability and optical detection without mutual blocking.
Solution Approach 2:
Different regions of the device are assigned different functional properties: the upper region is dedicated to optical detection with light guide plates and photodiodes, while the lower region contains the RFID antenna. This local differentiation allows each component to operate optimally in its designated zone without interfering with others, maintaining both light transmission quality and RFID signal reception.
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 integrated device improves the accuracy of two-dimensional code detection and reduces interference, allowing for efficient operation of both RFID and optical reading functions while optimizing device size and sensitivity.
Implementation Method 1
a light-transmitting light guide plate that has a first surface on one side in a first direction and on which an object to be detected is to be placed so as to overlap the first surface
Implementation Method 2
an optical sensor that is disposed on the other side in the first direction with respect to the light guide plate so as to overlap the light guide plate and includes a plurality of photodiodes arranged in a planar configuration
Implementation Method 3
an antenna coil disposed so as to overlap at least either one of the light guide plate and the optical sensor as viewed in the first direction
Data Source
AI summary
According to an aspect, a detection device includes: a light-transmitting light guide plate that has a first surface on one side in a first direction and on which an object to be detected is to be placed so as to overlap the first surface; an optical sensor that is disposed on the other side in the first direction with respect to the light guide plate so as to overlap the light guide plate and includes photodiodes; a light source that is adjacent to the light guide plate in a second direction intersecting the first direction and is configured to emit light to a side surface of the light guide plate; and an antenna coil overlapping at least one of the light guide plate and the optical sensor as viewed in the first direction. The optical sensor, the light source, and the antenna coil are electrically coupled to a control board.