Sheet Conveyance Device Wireless Tag Writing Power Control
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Solution Overview
Problem
Existing sheet conveyance devices in printers and multifunctional peripherals face challenges in writing information to wireless tags due to unstable wireless signal strengths, leading to either incomplete or incorrect data transfer to targeted tags.
Innovation Solution
A sheet conveyance device with a conveyance roller, communication device, and processor that adjusts the transmission power of radio signals to ensure a minimum response signal strength is achieved, setting the corresponding power as the reference for optimal data transfer to wireless tags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to ensure reliable writing to wireless tags, then writing reliability is improved, but information may be written to non-targeted wireless tags causing security issues
Solution Approach 1:
The patent applies local quality by creating a localized high-power transmission zone only at the specific position where sheet conveyance occurs. The transmission power is concentrated locally at the tag reading/writing position rather than being uniformly high throughout the entire cassette area, enabling reliable writing to targeted tags while avoiding interference with non-targeted tags in other locations.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting transmission power based on the position and state of sheet conveyance. The transmission power is increased only when a sheet is actively being conveyed through the tag reading/writing position, and reduced or turned off when no sheet is present. This dynamic control enables reliable communication during the brief moment of sheet passage while preventing interference with tags in stored sheets.
2Object-affected harmful factors
If transmission power is decreased to avoid writing to non-targeted tags, then security is improved, but writing reliability to targeted tags deteriorates
Solution Approach 1:
The patent applies periodic action by transmitting radio waves in short, repeated bursts during the sheet conveyance process. Instead of continuous low-power transmission, the system sends multiple periodic transmission pulses as the sheet passes through the reading/writing position, accumulating sufficient energy transfer to reliably write information while limiting the spatial reach of each individual pulse to avoid affecting non-targeted tags.
Solution Approach 2:
The patent implements preliminary action by detecting the presence and position of a sheet before initiating high-power transmission. The system first detects when a sheet is conveyed to the tag reading/writing position, then activates high-power transmission only after this preliminary detection confirms the correct target is in place, ensuring both reliability and security.
3Reliability
If high transmission power is used continuously, then writing capability is improved, but energy consumption increases and non-targeted tags are affected
Solution Approach 1:
The patent implements dynamics by dynamically adjusting transmission power based on the position and state of sheet conveyance. The transmission power is increased only when a sheet is actively being conveyed through the tag reading/writing position, and reduced or turned off when no sheet is present. This dynamic control enables reliable communication during the brief moment of sheet passage while preventing interference with tags in stored sheets.
Solution Approach 2:
The patent applies periodic action by transmitting radio waves in short, repeated bursts during the sheet conveyance process. Instead of continuous low-power transmission, the system sends multiple periodic transmission pulses as the sheet passes through the reading/writing position, accumulating sufficient energy transfer to reliably write information while limiting the spatial reach of each individual pulse to avoid affecting non-targeted tags.
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 allows for accurate and targeted writing of information to wireless tags by setting the optimal output strength of wireless signals, preventing errors from low signal strength and ensuring data is written only to the intended tags.
Implementation Method 1
a communication device configured to transmit a radio signal to the wireless tag and receive a response signal therefrom
Data Source
AI summary
A sheet conveyance device includes a roller by which a sheet having a wireless tag is conveyed along a path, a communication device configured to transmit a radio signal to the wireless tag and receive a response signal therefrom, and a processor configured to repeatedly perform a process of controlling the roller to convey a sheet along the path while controlling the communication device to transmit the radio signal to a wireless tag of the sheet using a transmission power that is different in each repeat, and acquire a strength of the response signal from the wireless tag, and specify a minimum strength of the response signal that has been acquired in the repeated process, the minimum strength being equal to or greater than a threshold, and set a transmission power that has been used when the minimum strength has been acquired as a reference strength of the radio signal.