East guide technology on board the concept of copy board series: copy
Update date：2012-6-25
Today, East conduction technology to let you know the common concept in the copy board.
(1) the accuracy of the copy board for the accuracy of copy board, depends on two aspects, one is the accuracy of the software, one is the original image accuracy, software accuracy 32-bit floating point representation can say that there is any limit on the accuracy So the most important thing depends on the original scanned image accuracy, an analogy to speak, can wash 5-inch photos with the photo shoot of one million pixels, but if we want it to wash into a 20-inch photo it simply do not see The clear reason is the same, so for high precision circuit board, very high precision PCB diagram in order to be ferreted out, when the scan is necessary to choose a higher DPI. The significance of the DPI is the number of points per inch. In other words, the distance between two points on the scanned image is 1000/DPI unit mil, if DPI is 400, then the distance between two points on the image is 1000/400 = 2.5 mil, which is when the accuracy is 2.5mil. this is the most scientific basis, so it was said that the accuracy can reach 1mil, that there is a prerequisite. In fact, the accuracy of the copy board depends on the original scan accuracy. To sum up, set the DPI is necessary according to the required accuracy of the actual board in scanning the board, like the mobile phone board and line spacing accuracy requirements in the 1mil following, then you need to scan DPI should be set above 1000DPI . The scanner currently on the market to meet this condition. The higher the DPI, the picture is more clear, the higher the precision, but the drawback is that the image is too large, higher hardware requirements, so set according to specific circumstances. Board of the general accuracy of the commonly used 400DPI good board like the phone can be set in the above 1000DPI. Copy board type is present, some suggested that we can copy that board, sound Xuanhu, in fact, as long as the copy board software can directly open and save the PROTEL the PCB files, all placed on the element properties fully support the format of the PROTEL, include the placement of function can be ferreted out any type of board. 3. Copy of the board the choice of software copy board software is good or bad is still our main function is complete, it is best to do can all work on the copy board software, so that only high-efficiency, including component placement support PROTEL99SE for the most good 99SE of the library is very rich, can be downloaded to the interconnection network. This is a very critical thing, by the era of hand-made components have been in the past, because as many as hundreds of elements, like BGP component package too costly to go to build components by hand. When designing the circuit for reliable circuit, generally have large pieces of copper and the power supply or ground connection, which can reduce the circuit noise and interference. Related to the network of copper to the problem, for complex circuit boards, shop copper above many of you want to connect a lot to be isolated, then if the solution is not good this shop copper can not be achieved, so there must be Shop to the definition of the network of copper ("connected to the same network, different network isolation"), to all of the filling on the copper as a side road. This is also a key measure of the copy board software. Grinding plate for multilayer intermediate layer can not be directly scanned, to take down the multilayer must include the multi-layer grinding out copy multilayer certainly have to scrap a board. Current best way is to use a good grinder and hand yarn paper mill, using the latter method is the least expensive method of a sandpaper on the market and you could buy ordinary sandpaper, remember to coarse sandpaper. fine sandpaper is difficult to grinding action. The method is very simple, the board forced by a good level with sandpaper, if there is a large piece of copper available pliers can directly pull away, or with a flat fell a few worn put hard to grind, and then switch to sandpaper and then grinding.
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