RF Tag Reader Writer With Dynamic Output Adjustment
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Solution Overview
Problem
Conventional RFID systems require separate readers and writers for collective and selective communication, leading to potential errors in writing information to the wrong RF tag due to communication with nearby tags, necessitating additional equipment and user intervention to manage antenna directionality and transmission output.
Innovation Solution
An RF tag reader and writer with a communication stability determination unit that performs multiple selective readings to ensure stable communication with the intended tag, using a predetermined number of successful readings to confirm tag identity and adjust transmission output for reliable selective writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reader and writer with high transmission output and wide directionality range is used for collective reading, then reading efficiency is improved, but selective writing accuracy deteriorates due to communication with nearby tags
Solution Approach 1:
The patent applies dynamics by making the transmission output adjustable rather than fixed. The reader and writer can dynamically change the transmission output level based on the operation mode: using high output for collective reading to maximize range and efficiency, and switching to low output for selective writing to limit communication range and prevent accidental writing to nearby tags. This dynamic adjustment resolves the contradiction between reading efficiency and writing accuracy.
Solution Approach 2:
The patent implements parameter changes by modifying the transmission output parameter according to the operation type. The system includes a transmission output adjustment unit that changes the transmission output from a first level (high) to a second level (low) when switching from collective reading to selective writing mode. This parameter change ensures that during selective writing, only the intended tag within the reduced range can be communicated with, preventing accidental writing to other nearby tags while maintaining efficient collective reading when using high output.
2Reliability
If separate reader and writer devices are used for collective and selective communication, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by combining the functions of separate reader and writer devices into a single integrated reader and writer device. This unified device includes both reading functionality and writing functionality, along with a transmission output adjustment unit that enables it to perform both collective reading and selective writing operations reliably. By merging these functions, the system eliminates the need for multiple separate devices while maintaining communication reliability through the transmission output control mechanism.
Solution Approach 2:
The patent implements universality by designing a reader and writer device that can perform multiple functions: collective reading, selective reading, and selective writing. The transmission output adjustment unit enables the device to adapt its behavior based on the operation mode, making it universally applicable for different RFID communication scenarios. This multi-functional design replaces the need for specialized separate devices while maintaining the reliability of each specific function.
3Reliability
If transmission output is increased for reliable communication, then communication stability is improved, but error in writing to wrong tag increases
Solution Approach 1:
The patent applies dynamics by making the transmission output adjustable rather than fixed. The reader and writer can dynamically change the transmission output level based on the operation mode: using high output for collective reading to maximize range and efficiency, and switching to low output for selective writing to limit communication range and prevent accidental writing to nearby tags. This dynamic adjustment resolves the contradiction between reading efficiency and writing accuracy.
Solution Approach 2:
The patent implements parameter changes by modifying the transmission output parameter according to the operation type. The system includes a transmission output adjustment unit that changes the transmission output from a first level (high) to a second level (low) when switching from collective reading to selective writing mode. This parameter change ensures that during selective writing, only the intended tag within the reduced range can be communicated with, preventing accidental writing to other nearby tags while maintaining efficient collective reading when using high output.
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 reliable selective communication by confirming stable connection with the intended RF tag, reducing errors and the need for multiple devices, while optimizing transmission output for stable and accurate data transfer.
Implementation Method 1
the reader and writer radiates radio waves in a range of up to several meters, executes communication with unspecified RF tags
Data Source
AI summary
The present invention relates to an RF tag reader and writer including: a communication unit which communicates with an RF tag as a target from which information is obtained and obtains the information held in the RF tag; and a communication stability determination unit which determines that stable communication with a specific RF tag is being established when the same information is obtained over a predetermined plural number of times from the RF tag communicating with the communication unit.