Wireless Tag Writing Delay to Avoid Communication Dead Zones
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Solution Overview
Problem
Conventional wireless tag communication systems in image forming apparatuses face issues with erroneous information writing due to communication failures between the wireless tag communication apparatus and the wireless tag, particularly in areas where the radio wave communication is blocked, leading to incomplete or failed information transfer on wireless tags during sheet conveyance.
Innovation Solution
The system introduces a controller that delays the initiation of tag writing processing until a predetermined waiting time has elapsed after sheet conveyance begins, ensuring the wireless tag passes through potential communication dead zones, thereby enhancing the success rate of information writing on the wireless tag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wireless tag communication apparatus immediately performs writing processing when a sheet is conveyed, then the productivity is improved, but the reliability of information writing deteriorates due to communication failures in no communication areas
Solution Approach 1:
The system performs detection processing before writing processing to identify wireless tags in the communication area. By checking communication availability in advance and only initiating writing when tags are detected, the system ensures reliable communication before productivity-critical operations, resolving the contradiction between speed and success rate
Solution Approach 2:
The system continuously monitors detection signals and RSSI values to determine whether wireless tags are in the communication area. This feedback mechanism allows the writing processing to be dynamically enabled or disabled based on real-time communication conditions, ensuring both high productivity and reliability
2Reliability
If the electric power to emit radio wave is set to be small, then the reliability of preventing erroneous writing is improved, but the measurement precision of detecting wireless tag deteriorates
Solution Approach 1:
The system dynamically adjusts the radio wave emission power based on detection needs. During detection phase, higher power is used to ensure accurate tag identification. During writing phase, the power is controlled to prevent erroneous writing. This dynamic adjustment resolves the contradiction between detection precision and writing reliability
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 increases the success rate of information writing on wireless tags by ensuring they are within communication range before processing, thus preventing communication failures and ensuring accurate data transfer.
Implementation Method 1
a wireless tag communication apparatus that communicates with the wireless tag... sets for example electric power to emit a radio wave carrying a detection signal
Implementation Method 2
measures a received signal strength indicator (RSSI) of a radio wave (reflection wave) carrying a response signal sent back from a wireless tag
Data Source
AI summary
According to an embodiment, a wireless tag communication system includes a processing apparatus, a tag communication device, and a controller. The processing apparatus includes a conveyance device that conveys a sheet provided with a wireless tag. The tag communication device performs detection processing of the wireless tag of the sheet conveyed and writing processing of information on the wireless tag. The controller causes the tag communication device to execute the writing processing after the conveyance device has started to convey the sheet and a predetermined waiting time has elapsed.