The border (clamping edge) of the PCB board assembly method should be selected with a closed-loop control design scheme to ensure that the PCB board assembly method is not easy to deform after being fixed immobile in the fixture. The border (clamping edge) of the PCB board assembly method should be selected with a closed-loop control design scheme to ensure that the PCB board assembly method is not easy to deform after being fixed immobile in the fixture. The design of the appearance of the PCB board assembly method is as close to the square as possible, and it is highly recommended to use the 2×2, 3×3, board assembly method. It is highly recommended to use 2×2, 3×3, …… PCB panel. pedal PCB
1. Mark point
(1) When setting the standard selection point, generally the selection of the point of the perimeter of the empty is 1.5 mm larger than its unobstructed soldering area.
(2) Used to assist SMT mounter electronic optical precision positioning PCB board with SMD components top corner at least two different measurement points, a PCB PCB electronic optical precision positioning measurement point is generally in the top corner of a PCB relative parts; layered PCB electronic optical precision positioning measurement point is generally in the top corner of the layered PCBpcb circuit board relative parts.
(3) For the components of QFP (square flat package) with a lead spacing of ≤0.5mm and BGA (ball grid array package) with a ball spacing of ≤0.8mm, to enhance the precision of SMD, it is stipulated that the measurement points are set at the two top corners of the IC.
2. Processing process edge
Patchwork way border and internal motherboard, motherboard and motherboard nodes in the middle of the perimeter can not quite large components or outreach components, and electronic devices and PCBpcb circuit board edges should be left more than 0.5 mm indoor space to ensure that the laser cutting CNC blades all normal operation.
3. Accurate positioning of holes on the board
(1) PCBpcb circuit board for the whole PCB circuit board precision positioning and fine spacing components precision positioning of the standard mark, under normal circumstances, the interval is less than 0.65mm QFP should be set in the top corner of the part; used to put together a PCB sub-panel of the precision positioning of the standard mark should be applied in pairs, the layout in the top corner of the precision positioning factors.
(2) Large electronic devices should be left with precise positioning columns or precise positioning holes, such as I/O sockets, microphones, rechargeable battery sockets, toggle switches, headphone jacks, motors, and so on.
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