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In the electronics assembly manufacturing PCBA industry, there are generally two types of "Mirror Board" as we call it. The first type is the Different side mirror board with the reverse side reversed, which is the first of a board. One side and the second side of another board are presented on the same side of the jigsaw; the other type is the same side mirror board (Same side mirror board) in which all the jigsaws are on the same side but the left and right sides are reversed, such as pdpd-shaped typesetting .
PCB puzzle
The reason why PCB manufacturers will require the "Yin Yang board" design is nothing more than the following two main reasons and benefits:
1. You can make full use of the advantages of PCB's long wire to achieve higher production efficiency
The overall efficiency of an SMT can be judged simply by looking at whether the machine is idle (idle). If it can be done without the machine at all, then we can say that the efficiency of this PCB line is up to 100%.
But is it so simple to achieve 100% efficiency? As the speed of SMT machine printing becomes faster and faster, SOC (System On Chip) parts are becoming more and more popular, and there are fewer and fewer parts on a board, but there is no solder paste printing machine (solder paste printing). machine)
Is there any significant speed improvement, so now many of the bottlenecks of SMT lines appear in the solder paste printing machine, that is, the solder paste printing machine has no rest, while other more expensive machines are waiting.
Let’s put it this way, assuming that the time to print a solder paste steel plate is about 20 seconds (depending on the length of the printing), and assuming that the pick & place immediately following takes less than 20 seconds. Finished, the remaining time of this machine is wasted idle, which is equivalent to buying a high-end Ferrari sports car, but it is parked in the garage and not moving, because every one on the PCB Machines are very expensive, so make the most of their value as much as possible, and don't let them have any time to wait, so that you can use them to make money.
Therefore, some people have come up with the use of panelization/panelization to increase the use time of the placement machine to greatly improve its use efficiency; but it is not possible to let the solder paste printer wait for it, so there is a positive, The reverse side of the yin and yang puzzle board appears, so that more different parts can appear on the same side of the board at the same time, so that the long PCB line with multiple placement machines can fully play its role.
Another important purpose is that the upper and lower parts can be printed with only one line, so there is no need to waste time changing lines.
2. It can save the wasted space of bare board, that is, improve the use efficiency of panelization and save money
PCB jigsaw method
Save the wasted space of the bare board, that is, improve the use efficiency of panelization and save money. In order to mass-produce and reduce costs, general circuit board manufacturers usually purchase some basic standard size plates, and the price is based on volume, such as 16.16"x16.16", 18.32"x18.32", 20.32"x20 .32"...etc. Some may only buy some larger substrate sizes instead of the entire series.
For some circuit boards with a non-square shape, the yin and yang board are designed to be assembled. There is a chance to squeeze one or two more circuit boards into the same circuit board, so that the use efficiency of the board can be improved, and the purpose of saving costs can be achieved. .
Because the price of the circuit board is calculated based on the utilization rate of the substrate, if the same size of the substrate is used, the appearance of the A design can only produce one circuit board, and the B design can produce two circuit boards. The price of the A board will be twice that of the B board.
