Structure of FPC
According to the number of layers of conductive copper foil,
FPC can be divided into single layer circuit, double layer
circuit, multi-layer circuit, double sided and so on.
Single-layer structure: the flexible circuit of this structure
is the simplest structure of the flexible PCB. Usually the
base material (dielectric substrates) + transparent rubber
(adhesive) + copper foil is a set of purchased raw materials
(semi-manufactures), the protective film and transparent glue
are another kind of bought raw material. First, copper foil
must be etched to obtain the required circuit, and the
protective film should be drilled to reveal the corresponding
pad. After cleaning, the two are combined by rolling. Then the
exposed part of the pad electroplated gold or tin to protect.
In this way, the big panel board will be ready. Generally also
it’s stamped into the corresponding shape of the small
circuit board. There is also no protective film directly on
the copper foil, but printed resistance soldering coating, so
that the cost will be lower, but the mechanical strength of
the circuit board will become worse. Unless the strength
requirement is not high and the price needs to be as low as
possible, it is best to apply the protective film method.
Double layer structure: when the circuit is too complex to be
wired, or copper foil is needed to shield the ground, it is
necessary to choose a double layer or even a multilayer. The
most typical difference between a multilayer and a single
plate is the addition of a perforated structure to connect the
layers of copper foil. The first process of transparent rubber
+ base material + copper foil is to make holes. Drill holes in
the base material and copper foil first, clean and then plated
with a certain thickness of copper. The subsequent fabrication
process is almost the same as the single-layer circuit.
Double sided structure: both sides of the double sided FPC
have pads, mainly used to connect other circuit boards.
Although it and monolayer structure is similar, but the
manufacturing process is very different. Its raw material is
copper foil, protective film and transparent glue. The
protective film should be drilled according to the position of
the pad first, then the copper foil should be affixed, the pad
and track lines should be etched and then the protective film
of another drilled hole should be affixed.
FPC Case: Multilayer 4 Layer Flexible PCB for GPRS Router
(Flexible printed circuits are custom-made products, the
picture and parameters shown are just for reference)
This is a type of flexible printed circuit for the application
of GPRS Router. It’s a 4 layer multilayer FPC at 0.25mm
thick. The base laminate is from ITEQ, It’s fabricated per
IPC 6012 Class 2 using supplied Gerber data.
Parameter and data sheet
Features and benefits
|Size of Flexible PCB
||50.32 X 30.28mm
|Number of Layers
|| Flexible PCB
|| Polyimide 25µm
|Board Material Supplier
|Tg Value of Board Material
|PTH Cu thickness
|Inner Iayer Cu thicknes
|Surface Cu thickness
||Yellow / Black
|Number of Coverlay
|Thickness of Coverlay
|Type of Silkscreen Ink
|Supplier of Silkscreen
|Color of Silkscreen
|Number of Silkscreen
|Peeling test of Coverlay
||3M 90℃ No peeling after Min. 3 times test
|Thickness of Nickle/Gold
||Au: 0.03µm(Min.); Ni 2-4µm
|Thermal Shock Test
||Pass, -25℃±125℃, 1000 cycles.
||Pass, 300±5℃,10 seconds, 3 cycles. No delamination, no blistering.
||100% Pass electrical test
||Compliance with IPC-A-600H & IPC-6013C Class 2
Reducing the volume
Consistency of assembly
Controllability of electrical parameter design
The end can be whole soldered
Continuity of processing
Great customer service
Delivery on time: >98%
Flexible flat cable, medical equipment controller, consumer
card reader soft board
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