PCB hard and soft version of the design points of attention

1. For circuits that require repeated bending, it is best to use a single layer of flexible construction and use RA copper to increase fatigue life.

2. It is recommended that the copper skin of the flexible circuit should be bent in a straight direction. But sometimes can not do, then please try to reduce the bending amplitude and frequency, but also according to the mechanical planning requirements of the use of tapered bending.

3. It is best to prevent the use of abrupt right angles or hard straight 45 ° angle alignment, but the use of arc angle alignment. This can be in the bending process, reduce the stress on the copper skin.

4. Do not suddenly change the width of the alignment, the line width of the abrupt change or articulation to the pad will constitute a weak point of force.

5. supply reinforcement for the pads. Due to the use of low adhesion adhesive (related to FR-4), the copper on the flexible circuit is more easily detached from the polyimide substrate. Therefore, it is especially important to supply reinforcement to the exposed copper skin. The coated through-holes provide proper anchoring for the 2 flexible layers, so the use of through-holes is a very good reinforcement.

6. Insist on double-sided flexibility. On the dynamic double-sided flexible circuit, try to prevent the placement of alignment in the same direction, but the need to stagger them, so that the copper skin alignment evenly spread.

7. need to think about the bending radius of the flexible board, the bending radius is too small will simply damage.

8. useful to reduce the total area, optimize the planning to reduce the cost.

9. need to think about the construction of the plane space after installation.