Hello.
I've studied PCB manufacturing process in googling and most of the articles represent PCB manufacturing process for 4 layer case.
The article said some mechanical drill bit is used to drill the hole through the PCB as first step of making Plated Through Hole, corridor to connects all electrical layers in PCB. Making through hole via looks very clear so I have no confusion about this.
The question arises when I read some article from PCB manufacturer website saying that they don't use depth-controlled drill bit to make via so not all combinations of layer connections with blind and buried via are possible (for ex, connection of blind via from 1st to 3rd layer is allowed while 1st to 2nd is not). The Ultiboard (PCB design software) also allows only some of layer connections with blind via.
Then...how they can they make blind and buried via? The most of the PCB article shows only how to make through hole via, not other types of via. I need to know this process to trace back why not all layer connections are allowed.
Thanks to read this post and please give me some comments.
I've studied PCB manufacturing process in googling and most of the articles represent PCB manufacturing process for 4 layer case.
The article said some mechanical drill bit is used to drill the hole through the PCB as first step of making Plated Through Hole, corridor to connects all electrical layers in PCB. Making through hole via looks very clear so I have no confusion about this.
The question arises when I read some article from PCB manufacturer website saying that they don't use depth-controlled drill bit to make via so not all combinations of layer connections with blind and buried via are possible (for ex, connection of blind via from 1st to 3rd layer is allowed while 1st to 2nd is not). The Ultiboard (PCB design software) also allows only some of layer connections with blind via.
Then...how they can they make blind and buried via? The most of the PCB article shows only how to make through hole via, not other types of via. I need to know this process to trace back why not all layer connections are allowed.
Thanks to read this post and please give me some comments.