source:Industry News release time:2022-09-07 Article author:yu Popular:pcb
The most effective way to increase the density of PCB is to reduce the number of through holes, and to accurately set blind holes and buried holes.
1. Blind hole definition
a: In contrast to through holes, through holes refer to holes drilled through all layers, while blind holes are non-drilled through holes.
b: Blind hole subdivision: Blind hole (BLINHOLE), buried hole BURIEDHOLE (outer layer is not visible); c: Distinguish from the production process: Blind holes are drilled before pressing, while through holes are drilled after pressing .
2. Circuit board production method of Shenzhen circuit board factory
A: Drill belt:
(1): Select the reference point: select the through hole (that is, a hole in the first drill strip) as the element reference hole.
(2): Each blind hole drilling belt needs to select a hole and mark its coordinates relative to the reference hole of the unit.
(3): Pay attention to indicating which drill belt corresponds to which layers: the unit sub-hole diagram and drill nozzle table must be marked, and the names before and after must be the same; the sub-hole diagram cannot be represented by abc, and the front is used 1st, 2nd indicated situation.
Note that when the laser hole and the inner buried hole are nested together, that is, the holes of the two drill strips are in the same position, the customer needs to move the position of the laser hole to ensure the electrical connection.
B: Shenzhen circuit board factory is producing pnl board edge process hole: ordinary PCB multilayer circuit board: inner layer is not drilled;
(1): The rivets gh, aoigh and etgh are all made after etching the plate
(2): target hole (drilling gh) ccd: copper skin needs to be cut out for the outer layer, x-ray machine: direct punching, and pay attention to the minimum length of 11 inches.
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