How to design the Rigid-Flex PCB better?
1.Design requirements of FPC layer:
(1)The layer should avoid sudden expansion or contraction, and use a tear shape between the thick and thinlayer.
(2)Use rounded corners to avoid sharp corners.
2. When the pad meets the electrical requirements, the maximum value should be taken. A smooth transition line is used at the connection between the pad and the conductor to avoid right angles,The independent pad should be added with a toe to strengthen the supporting effect.
3. Dimensional stability: add copper design as much as possible, and design as many solid copper ponds as possible in the waste area.
4, the design of the cover film window
(1) Add manual alignment holes to improve alignment accuracy.
(2)The window design considers the range of glue flow, usually the window opening is larger than the original design, and the specific size is provided by ME.3. Special mold design can be used for small and dense windows; rotating punch, jump punch, etc.
5. Design of Rigid-flex Transition Zone1. For the smooth transition of the line, the direction of the line should be perpendicular to the bending direction,2. The wires should be evenly distributed throughout the bending area.3. The width of the wire in the entire bending zone should be maximized, the transition zone should not be designed with PTH as much as possible, and the design of Coverlay and No flow PP in the rigid-flexible transition zone.
6. Design of flexible zone with air-gap requirements
(1)There must be no through holes in the part to be bent.
(2) Add protective copper wires on both sides of the line. If there is not enough space, choose to add protective copper wires at the inner R corners of the bent part.
(3)The connecting part of the line needs to be designed as an arc.
(4)The larger the bending area, the better without affecting the assembly.
7.other
The tool holes of the soft board cannot be shared, such as punch holes, ET, SMT positioning holes, etc.