Differential Signal Transmission for Static Interference Reduction
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Solution Overview
Problem
Existing document processing devices, such as multifunction printers, suffer from printing errors due to static electricity interference during the paper feeding process, which affects the accuracy of document output.
Innovation Solution
A document processing device and method that convert document output commands into differential signals, which are then converted into interference-free information packets, with a buffer status checking signal ensuring accurate transmission and reducing errors caused by static interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the paper feeding process is performed in existing document processing devices, then the paper is fed into the processing device, but static electricity is generated on the paper causing transmission errors in document output commands
Solution Approach 1:
The patent introduces a differential signal transmission mechanism as an intermediary between the command transmission source and the printing engine. Instead of directly transmitting standard signals that are vulnerable to static interference, the system converts commands into differential signals (such as LVDS) that use paired signal lines with opposite polarities. This intermediary transmission method allows the signal to reject common-mode noise including static electricity interference, thereby maintaining command transmission accuracy during paper feeding operations.
2Device complexity
If standard signal transmission is used for document output commands, then the transmission process is simple, but static electricity interference causes printing information errors
Solution Approach 1:
The patent replaces the traditional electrical signal transmission system with a differential signaling system. Instead of using single-ended voltage signals that are susceptible to static interference, the invention adopts a balanced differential transmission approach where signals are transmitted through paired conductors carrying equal and opposite voltages. This substitution fundamentally changes the transmission mechanism to be inherently immune to static electricity and electromagnetic interference, thereby improving printing information accuracy without significantly increasing overall system complexity.
Data Source
AI summary
Disclosed are a document processing device and a signal transmission method thereof. The document processing device includes a processor and a printing engine. The processor is connected to the printing engine. The processor receives a document output command to generate a first differential signal. Then, the printing engine receives the first differential signal and converts the first differential signal into a first interference-free information packet. When the printing engine has already obtained the first interference-free information packet, the printing engine sends a buffer status checking signal to the processor. The document processing device uses the transmission of the first differential signal to reduce printing information errors caused by static interference, so as to achieve the purpose of improving the accuracy of printing information.