From:sochi
It is to connect the outermost circuit in the printed circuit board (PCB) and the adjacent inner layer with electroplated holes. Because the opposite side cannot be seen, it is called blind through. In order to increase the space utilization between board and circuit layers, blind holes are used. The blind hole is a through hole to the surface of PCB.
The blind hole is located on the top and bottom surface of the circuit board and has a certain depth. It is used for the connection between the surface circuit and the bottom inner circuit. Generally, the depth of the hole has a specified ratio (aperture). Special attention should be paid to this production method, and the drilling depth must be just right, otherwise it will cause electroplating difficulty in the hole. As a result, few factories will adopt this production method. In fact, it is possible to drill holes in the circuit layer to be connected in advance, and then glue them together. However, more precise positioning and alignment devices are needed.
Kunshan Sochi Electronics Co., Ltd. is a diversified service company integrating production and trade. Our main service targets are automotive electronics, semiconductor and PCB industry customers. Our company's main products are PCB equipment; PCB CNC drilling machine and milling machine parts; repair and maintenance of drilling /molding machine; maintenance of spindle and various chip boards; production and processing of automobile molds and parts.
