source:Industry News release time:2021-11-29 Article author:sznbone Popular:pcb
Reasonable design of multi-layer pcb circuit board assembly not only involves the quality of the circuit board, but also directly affects the production cost of the multi-layer PCB circuit board. Multi-layer pcb circuit board manufacturers pay great attention to a problem to be solved. The following introduces to you about the rules and techniques of multi-layer pcb circuit board assembly:
1. PCB board width ≤260mm (SIEMENS line) or ≤300mm (FUJI line) ); If automatic glue dispensing is required, the width×length of the PCB panel is ≤125 mm×180 mm.
2. The shape of the PCB jigsaw should be as close as possible to the conventional graphics. It is recommended to use 2*5 and 3*3 jigsaws, which can be assembled according to the thickness of the board;
3, the outer frame of the PCB jigsaw should adopt a closed-loop design to ensure that the jigs It will not be deformed.
4. The center distance between the small plates is controlled between 75 mm and 145 mm.
5. There should be no large components near the connection points between the shape of the panel and the small board inside the PCB, between the small board and the small board, and there should be a space greater than 0.5mm between the components and the board.
6. Four positioning holes are made at the four corners of the outer frame of the jigsaw panel, plus Mark points, with a diameter of 4mm (±0.01mm); the strength of the holes should be moderate to ensure that they will not break during the upper and lower boards, and the hole walls are smooth and free of burrs. .
7. In principle, QFPs with a spacing of less than 0.65mm should be set at their diagonal positions; the positioning reference symbols used for imposition PCB daughter boards should be used in pairs and arranged at the opposite corners of the positioning elements.
8. When setting the reference positioning point, usually leave a non-resistance area 1.5 mm larger than it around the positioning point.
9. For some large components, there should be positioning posts or positioning holes, such as I/O interface, microphone, battery interface, micro switch, headphone interface, etc.
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