PCB News - Secrets that most PCB manufacturers don’t know

Secrets that most PCB manufacturers don’t know
Generally, there are products that use wireless communication. Usually, a shielding frame is designed on the circuit board to isolate electromagnetic interference (EMI). However, for the shielding frame to function, two parts are generally required, one is Use smt-made shielding frame (shielding frame), the other is shielding can (Shielding can), so it is necessary to open more than two sets of Press molds.

Regardless of the cost of opening the mold, as far as I use the shielding frame, it must go through several layers of sheet metal processing to be formed, and the general shielding frame is required to be able to be printed on the SMT machine, so its flatness (Flatness) The requirements of the steel plate are generally required to be made below 0.10mm, because most of the steel plate thickness is set at 0.12mm, assuming that the step-up stencil is used, the thickness of the steel plate can only be 0.15mm at most, so it is low In the case of high yield and heavy industry demand, the cost of this shielding frame has remained high. And most of the SMT printing requires additional tape-on-reel (tape-on-reel), which is another cost.

Nowadays, some fast-moving manufacturers have come up with a way to replace the shielding frame with a clip. This kind of clip can not only be used for SMT printing, but also is small in size so it is not afraid of deformation. In fact, the earlier tubular fuses (fuse) are There are similarly designed products.

This kind of clip can directly replace the shielding frame. After the clip is welded to the circuit board, the shielding cover can be directly installed in the middle of these clips and clamped, which is equivalent to reducing the cost of a shielding frame.
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