Radio Tag Communication Device Writing Reliability
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Solution Overview
Problem
Image forming apparatuses face challenges in accurately timing the writing of information to radio tags, particularly when the tags are moving, leading to signal transmission failures and potential writing failures.
Innovation Solution
A radio tag communication device with an antenna and control unit that repeatedly transmits an interrogation signal until the response signal strength meets a predetermined threshold, ensuring successful data writing to the radio tag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radio tag communication device transmits the interrogation signal once at a fixed timing, then the device complexity is low, but the writing reliability deteriorates because the signal may not reach sufficient strength when the tag is moving
Solution Approach 1:
The radio tag communication device repeatedly transmits the interrogation signal at periodic intervals during the object conveyance period instead of transmitting once. This periodic transmission ensures that at least one signal is transmitted when the radio tag is within the optimal communication range and signal strength threshold is met, thereby improving writing reliability while managing system complexity through a straightforward repetitive transmission protocol
Solution Approach 2:
The system dynamically adjusts the transmission timing by continuously monitoring the reception strength of response signals from the moving radio tag. The interrogation signal transmission is adapted in real-time based on the detected signal strength, allowing the system to optimize communication timing as the tag moves through the conveyance area, resolving the contradiction between fixed timing simplicity and moving tag reliability
2Reliability
If the interrogation signal is transmitted repeatedly until sufficient signal strength is achieved, then the writing reliability improves, but the loss of time increases due to multiple transmission attempts
Solution Approach 1:
The system performs preliminary detection of the radio tag's presence and signal strength characteristics before initiating the actual data writing transmission. By预先 detecting the tag and assessing communication conditions, the system can determine the optimal transmission timing in advance, reducing the need for multiple retry attempts and thereby minimizing time loss while maintaining high writing reliability
Solution Approach 2:
The system uses feedback from the received response signal strength to control the transmission process. The reception strength of the response signal serves as feedback that indicates whether the radio tag is in optimal communication range, allowing the system to adjust transmission timing and avoid unnecessary repeated transmissions, thus balancing reliability improvement with time efficiency
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
This approach significantly reduces the frequency of writing failures even when radio tags are in motion, by ensuring adequate signal strength for reliable data transfer.
Implementation Method 1
an antenna that transmits an interrogation signal and receives a response signal from a radio tag transmitting the response signal in response to the interrogation signal
Data Source
AI summary
According to one embodiment, a radio tag communication device includes an antenna configured to transmit an interrogation signal and receive a response signal from a radio tag transmitting the response signal in response to the interrogation signal. A radio tag communication control unit of the device is configured to cause the antenna to repeatedly transmit the interrogation signal from a start time of an object conveyance until a reception strength of the response signal received by the antenna is equal to or greater than a predetermined threshold, and then perform writing on the radio tag via the antenna once the reception strength of the response signal received by the antenna is equal to or greater than the predetermined threshold.