PCB Tech - What are the advantages and disadvantages of the soft and hard board FPC

The birth and progress of FPC and PCB have led to the production of a new product of soft and hard bonding board.

Because of this, the soft and hard bonding board is the flexible circuit board and the rigid circuit board, which are assembled according to the relevant process requirements through pressing and other processes to form a circuit board with the special properties of FPC and the special properties of PCB.

Since the rigid and flexible bonding board is a combination of FPC and PCB, the production of flexible and hard bonding boards should have both FPC production facilities and PCB production facilities.

First, the electronic engineer draws the circuit and shape of the flexible joint board according to the needs, and then distributes it to the factory that can produce the soft and hard joint board. The CAM engineer performs processing and planning on the relevant documents, and then arranges the FPC production line for production. FPC and PCB production lines produce PCB. After these two soft and hard boards come out, in accordance with the plan requirements of the electronic engineer, the FPC and PCB are seamlessly pressed by a pressing machine, and then a series of details are passed to the final product. The soft and hard joint board.

A very important link should be the difficulty of the hard and soft board, and there are many details. Before shipment, a full inspection is usually carried out, because its value is relatively high, so that the supply and demand will not cause related benefits and losses. Its biggest shortcoming is that the price of "soft and hard board" is more expensive, which may be nearly double the price of the original naive "soft board + hard board", but if you deduct the price of the snow washing connector or HotBar Costs, their prices may tend to be exactly the same, and careful costing may require more actuarial calculations to have a clearer outline.

Another shortcoming is that it may require the use of a carrier to support the part of the soft board for both the production and the furnace, which invisibly increases the assembly cost of the SMT.

The advantages and disadvantages of FPCB, but it has many advantages as follows:

1. It can effectively save the space on the circuit board and eliminate the use of the connector or HotBar process. Since the FPCB soft and hard bonding boards have been patched together, the original space required to use the connector or the HotBar process can be saved However, for a circuit board wrench that requires a high degree of density, losing a connector space is like picking up a treasure. In this way, it saves the cost of parts using the connector or the cost of the HotBar process. In addition, the space between the two wrenches can be made more urgent due to the elimination of the connector.

2. The signal transmission distance is reduced and the speed is increased, which can effectively improve the reliability. The traditional signal transmission through the connector is "circuit board-connector-flexible board-connector-circuit board". The signal transmission of the composite board is reduced to "circuit board-flexible board-circuit board", the distance of signal transmission is shortened, and the problem of signal transmission attenuation between different media is also reduced. The circuit is made of copper, and the contact terminals of the connector are gold-plated, and the solder pins are fully tin-plated, and solder paste is required to be soldered on the circuit board. The signal transmission between different media is unavoidable. A little attenuation, if you switch to soft and hard bonding boards, these media will become less, and the experience of signal transmission can also be relatively improved. For a bit of signal accuracy, products that require higher signal accuracy will help increase its reliability. Spend.

3. Simplify product assembly and save assembly man-hours. The use of soft and hard joint plates as appropriate can reduce the man-hours of SMT parts, because the number of connectors is reduced. It also reduces the man-hours of the whole machine assembly, because the assembly action of inserting the soft board into the connector is omitted, or the manufacturing process of the HotBar is omitted. It also reduces the cost of parts management and warehousing. As the BOM is reduced, the management becomes less.