1. Laminated structure
2. Production process
Cutting → inner layer line → inner layer etching → inner layer AOI → browning → pressing → one-time drilling → sinking copper → board electricity → outer layer circuit → outer layer pattern plating → half hole routing → outer layer etching → outer layer AOI inspection → impedance test 1 → pre-treatment of solder mask → solder mask → impedance test 2 → immersion gold → character → secondary drilling → board routing → electrical test → FQC → packaging
3. Manufacturing difficulties
This circuit board is a half-hole board.
1) The definition of a half-hole board:
once the hole is drilled and then drilled again, the shaping process will eventually retain half of the metalized hole (groove), in short, the metalized hole on the edge of the board is cut in half.
2) How to control the product quality after forming the semi-metalized hole on the edge of the board.
If the copper thorns on the hole wall are raised and left, it has always been a problem in the processing process.
This type of PCB with a whole row of semi-metalized holes on the side of the board is characterized by a relatively small aperture and is mostly used on a carrier board, as a daughter board of a mother board, through these semi-metalized holes and the mother board and components lead The feet are soldered together.
Therefore, if there are copper thorns remaining in these semi-metalized holes when the plug-in manufacturer performs soldering, it will cause weak solder feet and false soldering, which will seriously cause a bridge short circuit between the two pins.
Aimed at the problem of oxidation, copper peeling, or burrs on the half-hole PCB. Our control measures are as follows: control the time (within 24H) from the pattern plating to the half hole of the Routing, which effectively avoids the problem of the effective half hole.
Aiming at the problem of the half-hole PCB, copper peeling, and burrs, we will reduce the speed of the routing shaft and shorten the routing path, which can effectively reduce the defective rate of the half-hole routing.
3) Another relatively big problem
Another relatively big problem of the half-hole board is that during the SMT process, the half-hole area is likely to be tinned with the vias, resulting in a short circuit. In response to this problem, we stipulate that all half-hole boards must use aluminum plug hole technology. To put it simply, fill the vias with ink to prevent tin from flowing into the vias during the SMT process.
4. Application areas:
This half-hole board is used in car navigation application systems, and it is welded to the car navigation motherboard by half-hole tinning. Such a design can effectively reduce the volume of the car’s center console and also help reduce costs.
5. Our advantage
RCY has more than 10 years of experience in the production of half hole PCB, and our production yield of half hole PCB has reached 90-95%. At present, the half hole PCB we produce is widely used in automotive electronics, Bluetooth modules, printer cartridges, and other fields.