FPC soft circuit board terminology(1)

- Nov 03, 2018-

FPC is a flexible circuit board. The flexible circuit board is made of polyimide or polyester film.Referred to as soft board or FPC, it has the characteristics of high density, light weight and thin thickness of wiring.

FPC is mainly used in mobile phones, laptops, pdas, digital cameras, LCM and many other products.

1. Access Hole

Often referred to as the protective Coverlay on the outer surface of the soft plate (a perforated hole that must be punched out first), used for bonding on the surface of the soft plate line as a solder mask.However, it is necessary to expose the hole wall or square welding pad required for welding, so as to facilitate the welding of parts.A "Access Hole" is a Hole in the surface layer that allows the outside world to "get close" to a solder spot on the surface beneath the surface layer.Some laminates also have these openings.

2, Acrylic Acrylic

Polyacrylic resin is commonly known, most of the soft plate use its thin film, as the next film use.

3, Adhesive glue or adhesives

A substance, such as a resin or paint, that enables two interfaces to bond.

4. Anchoring adhesion

On the middle plate or single panel, in order to make the hole welding pad on the board surface has a stronger adhesion property, can be in its hole ring outside the surplus space, and additional add a few finger claws, so that the hole ring is more consolidated, to reduce the possibility of floating from the board surface.

5. Bandability bending

A feature of the Dynamic Flex Board, such as the Print Heads of computer disk drives, which is attached to the Board, shall be of a "bending test" of a billion times.

6. Bonding Layer Bonding Layer, then Layer

Usually refers to the film layer of a multilayer board, or TAB roll, or the plate of a flexible board, its copper-clad layer with polyamide (PI) substrates.

7. Coverlay/Cover Coat

The outer line of the soft plate is not easy to be soldered with the green paint used by the hard plate as it may fall off when bending.It is necessary to use a soft "compression force" layer to press on the surface of the plate, which can be used as a solder mask and protect the outer line, as well as enhance the resistance and durability of the soft plate. This special "outer membrane" is specially called surface shield or protective layer.

8. Dynamic Flex(FPC) Dynamic software board

Refers to a flexible circuit board that needs to be used for continuous movement.In addition, there is a "Static FPC", which means a kind of soft board that no longer has any action after being properly assembled.