PCB News - The function and disadvantage of FPC line row

The function and disadvantage of FPC line row

1. What is FPC cable

Speaking of FPC wiring, everyone undoubtedly has mastered or understood what FPC is? FPC can be divided into many types according to its functions, such as FPC wireless antennas, FPC touch screens, FPC capacitive screens, etc. Group of electrode connecting wires that are bent horizontally.

2. FPC line row composition and main parameters

Because the FPC line bank is a kind of FPC, its composition is the same as that of FPC. FPC is generally long, and the two sides are designed into pluggable fibers, which can be immediately connected to the RF connector or welded on the product by electric welding. The middle is usually a route, because the FPC line must have a certain degree of flexibility, therefore, the plate is generally made of injection molded copper, which is resistant to roughness and flexibility.

Main parameters of line row:

The minimum graphic boundary line spacing is 3mil/3mil;

The minimum crimping hole is 0.15mm for finished products.

3. FPC line processing technology

The surface layer process used by FPC lines is generally gold-immersion, sometimes with rust removal. However, the rust removal processing technology is not heat-resistant, and the natural environment tolerance is worse than that of sinking gold, and the prices of the two are similar. Therefore, most of them use sinking gold processing technology. In addition, there are also processing techniques such as electroplating tin and tin spraying, but the high temperature resistance of FPC is generally below 280 degrees Celsius, while the temperature of the tin spraying is about 300 degrees Celsius, and as the strength of the solder paste is smaller, it is very rarely used.

Fourth, the main purpose of the function of the FPC line

The function of the FPC line bar depends on connecting two related parts or commodities. Nowadays, many products have adopted the line bank. Because of its flexibility, FPC line banks have long been used in many products such as photocopiers, mobile phones, and notebook computers. The key is concentrated in the Pearl River Delta region, and among them, Shenzhen is the first.

Five, the advantages and disadvantages of FPC line row

Advantages:

The use of FPC can greatly reduce the volume and net weight of electronic equipment, and the use of electronic equipment is necessary for the development trend of high density, practicality and high reliability. Therefore, FPC has been widely used in industries or commodities such as aerospace engineering, national defense, mobile communications, notebook computers, computer peripherals, PDAs, and digital cameras. In addition, it can be randomly allocated according to the space planning regulations, and can be moved and retracted at will in the three-dimensional space, thereby achieving the integration of the electronic device assembly line and the connection of the transmission line.

Defects:

In the whole process of manufacturing goods, cost should be the most difficult problem to consider. Because the flexible fpc is designed and manufactured for unique applications, the initial circuit principle, wiring, and photo baseboard cost more. Otherwise, there are unique flexible fpcs that must be used. Generally, it is best not to use them when used in small quantities. In addition, now that funds have already been invested in a lot of energy to do it, maintenance in the middle and later stages is of course indispensable, so soldering and repairing must be performed by well-trained staff.

FPC line storage

Different from other products, FPC flexible circuit boards are actually not allowed to touch with gas and water. So how should people properly store such commodities? I firmly believe that after reading the article the following points, everyone will look for reference answers.

The vacuum pump of the first FPC flexible circuit board cannot be destroyed. When loading the car, a bubble cushion must be placed next to the small box. The bubble cushion has a relatively good water absorption capacity, which has a very good effect on waterproofing. Perhaps, waterproof beads They are indispensable.

Secondly, after the Gangsi Festival, the small boxes must be stored in a dry and cool place with partition walls and away from the ground, and avoid sunlight. The temperature of the warehouse is best controlled at 23±3 degree Celsius, 55±10%RH. Under that standard, PCB boards with metal surface treatment such as gold, electro-gold, spray tin, nickel/silver plating, etc. can generally be stored for 6 months, PCB boards with metal surface treatment such as immersion silver, tin, OSP, etc. can generally be stored for 3 months.