Flexible circuit board (FPC) is made of a kind of laminated material that has insulation to resist heat, electrical properties, metal foil, and adhesive. Usually, conductive bumps allow conductivity between the flexible circuit board and another circuit board by pressing the bumps to pads with pressure. This creates electric flow between the systems. Flexible circuit boards are known for their lightness, thinness, flexibility, and convenience in size.
FPC has several advantages in many applications:
1) Tightly assembled electronic packages, where electrical connections are required in 3 axes, such as cameras (static application).
2) Electrical connections where the assembly is required to flex during its normal use, such as folding cell phones (dynamic application).
3) Electrical connections between sub-assemblies to replace wire harnesses, which are heavier and bulkier, such as in cars,rockets and satellites.
4) Electrical connections where board thickness or space constraints are driving factors.
Applications:
FPCs are often used as connectors in various applications where flexibility, space savings, or production constraints limit the serviceability of rigid circuit boards or hand wiring. In addition to cameras, a common application of flex circuits is in computer keyboard manufacturing; most keyboards made today use flex circuits for the switch matrix.
Common Structures:
1) Single Side:
A single-conductor flex circuit is often employed as an inter-connect, either using connectors, or soldered directly to pads on the board using techniques such as hot bar soldering.
2) Double Sides:
Flex circuits with two conductive layers can be made with or without plated through-holes, though through-holes are usually provided. As with the single-layer circuit, apertures can be cut in the cover layer to allow assembly on one or both sides.
3) Single Side Double Access
Applied with single sided material to make pattern but make some window on base film and add on cover layer on pattern top. The final products will have single layer copper but two side access possibility. This structure we call that single side double access boards.
4) Single Side plus Single Side
Binding two single sided FPC by end point joint. The bending area will be non adhesive for getting better flexibility. This structure so called single side plus single side with air gap.
5) Multi-Layers
Binding several boards together so called Multi-layer and the drawing show here is an example of binding a single sided and a double sided FPC together.
6) COF (Clip-on-film)
COF is a direct attaching chip technology that was an packaging structure for attaching a chip on a flexible board.
7) Rigid-Flex Board
Binding flexible and rigid board structure together in same units as one part so called rigid-flex boards.
Item |
Description |
Technical capabilities |
1 |
Layers |
FPCB:8 layers
R-FPCB:20 layers |
2 |
Max. Board Size |
2000×800mm(79"×32") |
3 |
Base Copper |
Min. Thickness:1/3OZ(FPCB)
Max. Thickness:2OZ(FPCB) |
4 |
Min. Finished Thickness |
0.071mm/0.0028"(Single sided)
0.096mm/0.038"(Double sided)
0.305mm/0.012"(4 layers) |
5 |
Max. Finished Thickness |
3.8mm/0.150" |
6 |
Min. Drill Diameter |
0.15mm/0.006" |
7 |
Aspect Ratio |
10 |
8 |
Blind or Buried Via |
yes |
9 |
Min. Line Width/Spacing |
0.05mm/0.002" |
10 |
Insulation Resistance |
≤50Ω |
11 |
Conductive Resistance: |
≥10MΩ |
12 |
Testing Voltage |
250 +/- 25V |
13 |
Solderability Testing |
245 +/- 5ºC Time 5 sec |
14 |
Thermal Stress Testing |
288 +/- 5ºC Time 10 sec |
15 |
Flammability |
94V-0 |
16 |
Surface Finishing |
Flash Gold, Thick Gold (Hard or Soft Gold), Immersion Tin, Plating Tin, HASL, O.S.P, Silver Ink, Carbon Ink etc |
17 |
Gold Type |
Based On Gold Thickness :Flash Gold, Thick Gold
Based On Causes:ENIG, Plating Gold
Based On Component:Pure Gold(Soft Gold), Cobalt
Gold ( Hard Gold) |
18 |
Stiffener Type |
PI, PET, FR4, SUS etc.
|
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Dongguan LuPhi Electronics Technology Co., Ltd. (short for LUPHI bellow) is established in 2008. It located in Ziliang High-Tech Industrial Park, Huaide, Humen of Dongguan. The factory area is about 3500 square meters. It close neighbors to Shenzhen, Guangzhou and Hongkong. To Shenzhen airport is just about 30 minutes and to Guangzhou Baiyun Airport is just about 1 hour. LUPHI is a newly high-tech enterprise for human interface technology and metal, plastic molding, electronics product development, design and assembly.
Our main business and products include designing and manufacturing various kinds of super big size membrane switches, membrane keypads, graphic overlays, membrane circuits, various kinds of backlit membrane keypads like the LED backlit membrane switches, EL backlit membrane switches, LGF backlit membrane switches, the high-tech capacitive membrane switches and nameplates, labels, PCBA, prototype to middle volume metal + plastic + electronics turnkey project assembly.
At the beginning of establishing of LUPHI, we made the factory planning as per the requirements of our customers from USA and Europe, and the international standard. We invested big money to get many new and high accuracy big size semi-auto silk screen printing machines, high-performance pneumatic punching machines, hot embossing machine, high accuracy laser cutting machine, auto die cutting machine etc. LUPHI always regards the quality as our life. We established our inner testing room. We have many high-grade testing machines and equipments in our testing room, like the life testing instruments, 2D measurement instrument, high-low temperature environment test equipment, friction tester, dropping tester, electrical function testing instruments, ink adhesion tester etc. In addition, we also have the high clean room and anti-static clean booth to ensure the product reliability and stability for those high-accuracy and anti-static required products. By such kind of advanced hardware facilities and our experienced quality management team to ensure that each batch delivery to meet our customers' high quality requirements.
We organize the various kinds of training to our employees regularly. For example the product knowledge training, operation and assembly training, quality sense training, fire prevention training etc. To ensure our workers have the skillful operation technique to meet our promise of the on time delivery to our customers from all of the world.
80% customers of LUPHI are from USA, Australia, UK, Germany, Austria, France, Italy, Belgium, Sweden, Russia, Ukraine etc. Countries and areas. We know the overseas customers' requirements and business procedures very well. On this basis, we established our own perfect business development, engineering development & design, artwork making, production and quality control system.
We promise to use high quality raw materials to ensure our products achieve the quality goal of our customers. For example, we use Autotype PET, Lexan PC from GE, Korea Changsung silver paste, ACHESON silver paste, Japan JUJO inks, Nicomatic, CJT connectors, 3M adhesive, Luxking spacers etc.
LUPHI is dedicated to be the standard founder and leader for the membrane switches industry in China!
Warmly welcome you to visit us and discuss business!
