PCB production and processing of security camera
According to the consideration of wiring and cost, the camera with POE power supply mode can be used, the camera with power supply voltage of DC24 V or dc48 V standard can be used to reduce the voltage to DC12 V through the module, and the high-quality class 5 network cable and high-power and high-voltage Poe switch are used. In short distance (the trial distance is about 90 meters, the stability has no impact), the influence of wire on DC voltage can be ignored to ensure the camera's performance Poe power supply mode is not recommended for normal operation, long-distance data transmission and elevator monitoring. It can be negotiated with the elevator installation party to bind the network cable to the electric chair traveling cable. AC220 V is taken from the control box on the top of the elevator car to supply power to the transformer. The wireless module can also be used for data transmission, and HDI blind hole plate will be used
All tooling holes are drilled out, pay attention to rivets GH; need to be pulled out to avoid alignment deviation.
(AOI GH is also for beer out), the edge of PNL board needs to be drilled to distinguish each board.
3. Film modification:
(1) : note that film is positive, negative:
General principle: if the plate thickness is greater than 8 mil (without copper), the positive process shall be adopted;
If the plate thickness is less than 8 mil (without copper), negative film process (thin plate) is adopted;
The copper thickness at D / F, rather than the bottom copper thickness, should be considered when the wire thickness is large.
The blind hole ring can be done 5MIL without 7mil.
The independent pad of the inner layer corresponding to the blind hole should be retained.
Blind hole can not be made without ring.
