FPC connector consists of which parts, FPC connector rubber body physical property requirements!

FPC connector used to connect the printed circuit board (PCB) and flexible printed circuit board (FPC), so that the realization of mechanical and electrical connections. It is characterized by one end and PCB welding connection (more SMT welding), the other end and FPC plug, and FPC connectors designed to lock the device so that the FPC and FPC connector lock, to maintain a certain degree of contact reliability. Therefore, the connector's plastic body and terminals, as well as between the card lock parts have strict fit requirements. In order to meet the requirements of the SMT process, the entire product terminal welding area are strictly required to have good flatness and coplanarity, usually the industry norms for coplanarity 0.10max., otherwise it will lead to poor welding with the PCB and affect the use of the product. 1, the rubber body of the plastic body inside the equally spaced pieces of the fence structure, so that the terminals are assembled to maintain a small spacing of the arrangement and to provide a certain degree of retention force. According to the requirements of the product, the plastic body should have sufficient strength and toughness, and in the SMT welding before and after there can be no warping deformation. The following section will specifically introduce the design of the plastic body and raw material selection. 2, terminal terminal is the FPC / FFC connector contact parts, in order to achieve the connector high-density arrangement and more stable contact performance, FPC / FFC connector terminal using a narrow slice of the contact, the material selection of conductivity and mechanical strength of the better phosphor bronze. Usually, the design of the terminal structure will have two ways, one is the stamping plane under the material terminals (referred to as: under the material terminals), the other is the stamping after bending forming terminals (referred to as: forming terminals). Because the narrow piece type female terminals need to have enough flexibility and relatively complex shape, if the way of stamping and molding, it will cause difficulties to the stamping process, and molding size and precision is not easy to control. So usually female terminals are molded. Because the application of FPC/FFC connectors is characterized by straight pieces of FFC/FFC (Flexible Printed Circuit Board/Flat Cable) to match the insertion, so its terminal classification are female terminals. Therefore, it is usually also used in the way of undercutting. As shown in the figure below, FPC / FFC connector terminals, one end and PCB welding, the other end and FPC plug. 3, card lock card lock parts and plastic body, when the FPC / FFC inserted, the use of card lock parts to lock the FPC / FFC, so that it maintains a certain degree of contact force. Therefore, the parts are required to have good enough rigidity, usually produced using PPS raw materials. Step 1: pull open the connector card lock Step 2: insert FPC / FFC Step 3: lock the connector card lock small pitch, multi-thin-walled structure of the FPC / FFC connector plastic body weld plate is used to strengthen the connector and the PCB connection between the firmness, but also to avoid damage to the terminals due to the terminal to withstand the stress of too much damage to the terminals and the welding of the PCB. After assembly, the soldering tabs are required to be consistent with the coplanarity of all terminals. In FPC connectors with a small number of pins, the solder tabs are not mandatory.

In the design process of FPC/FFC connector, the structure of the plastic body parts and raw material selection directly affects the function and application of the SMT process. For the plastic body, not only is it necessary to pay attention to its ability to withstand high temperatures in the process of infrared reflow soldering, but also need to consider its ability to withstand impact. If the choice of too soft plastic, may lead to poor dimensional accuracy after molding, as well as easy deformation and other bad. If the choice of too hard plastic, there will be due to the impact of the plastic cracking bad. Therefore, a good plastic material not only requires high temperature resistance and low coefficient of thermal expansion, but also requires suitable for shooting small-pitch thin-walled results, and maintain a certain degree of strength and toughness. As shown in the figure below, for small pitch, thin-walled structure of the 0.5mm FPC connector plastic body. It can be seen, in the plastic parts required heat resistance, dimensional stability, molding and strength and so on several aspects, a variety of raw materials have their own defects. However, through the reasonable design of plastic structure and mold structure, and the use of appropriate molding injection molding process, can make up for the shortcomings of the plastic raw material itself, so as to achieve the product requirements. At present, the raw material usually selected is LCP (liquid crystalline polymer), reasonable parts structure and mold design to compensate for its defects in the fusion strength, LCP in other aspects of the excellent characteristics of the BTB connector can provide good performance and stable quality.

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