PCB News - Analyze the factors that affect the effect of the PCB file diagram

Analyze the factors that affect the effect of the PCB file diagram

A brief analysis of several factors that affect the effect of PCB file diagrams:

One, scanning process
Since PCB copy board involves a problem of copy board accuracy, for circuit boards with high precision requirements such as mobile phone boards, it is necessary to copy out high-precision PCB layouts. In the scanning process, the scanner needs to be accurately selected and set. First, ensure the accuracy of the original scanned image. It can be said that the accuracy of the copy board mainly depends on the original scanning accuracy.
In the PCB copying process, PCB scanning is undoubtedly the first step of all processes. To get a good PCB board, it must be scanned by a computer first, and the relevant parameters and the original PCB layout must be backed up.
After dismantling the board, get the split PCB light board and formally enter the stage of copying the board. The first thing to do is to scan to store and record the PCB image. One thing to mention here is that in order to ensure that the relevant parameters on the PCB are clearly visible after scanning, the stains and residual tin on the surface of the PCB should be removed before scanning.
Here, it is necessary to introduce a concept of DPI. The meaning of DPI is the number of dots per inch. That is to say, the distance between every two points on the scanned image is 1000/DPI, the unit is mil. Then, in the mobile phone board copy, the DPI is set to 1000 when the PCB is scanned, and the distance between two points on the image is 1000/1000=1mil, which means that the accuracy at this time is 1mil.
One thing to note is that the higher the accuracy of the scanned picture, the larger the picture and the higher the hardware requirements. Therefore, the DPI setting needs to be set according to the specific conditions of the original board to ensure that the next steps in the copying process can be Play the best results.
2. Software technology
After scanning the original PCB board, according to the original image, it is necessary to use PCB copying software to complete the file map.