FPC Film Key Switch Board FPC film key switch board features FPC hard, soft FPC fusion board, FPC and hardware equipment the same, a layer of substrate, etching process double-sided line. The gasket is also mechanically perforated and then electroplated, which also wraps the copper outside. If you want to make a double-layer FPC keyboard board, you can’t press it immediately like a double-layer hard board. Take a piece of paper, yes, it is very easy to bend, if you take a book, in both fixed case, there is no way to bend. Because the sides will be pulled, and the inside will be squeezed. Therefore, the FPC should not be made so thick that it can not be pressed together like a hard board. If you want to make a 4-layer FPC, the innermost layer is a 2-layer FPC with two unilateral FPC on the outside. Do not press the two sides together, do not press together in the middle, loose. If Bent, the innermost FPC will be bent out of many folds. This is the only way to ensure that the double-layer FPC can be bent and not easily disconnected. Hardware configuration FPC keyboard, flexible FPC keyboard, do not solder components, components hardware, can not be bent with FPC. If you want to weld components, you need to make sure that the component area of the FPC does not bend if it is hard. At the bottom of these areas, a “Reinforcing plate”must be added, i.e. the compressive strength is filled in. Mostly stainless steel and fiberglass. The FPC is pasted on the reinforcing plate so that it is not bent and the welding parts are not bent.With the FPC keyboard already in place, why do you need a hard and soft fusible keyboard? In fact, the FPC keyboard can also be electrically welded to the components, ensuring some hard and some soft. Therefore, FPC can not be used in the case of hard-soft fusible plywood, which is too expensive. It’s several times more expensive than FPC and hardware. FPC keyboard disadvantage is not suitable for making too double-layer or high-density power circuit, such as HDI (blind hole) . For an integrated circuit such as a BGA package, it is usually necessary to use a 1 or 2-step HDI board to draw the lines of the assembly pins. Generally adopt hard board, connector FPC, hard board design, Integrated Circuit on hard board, solution connector on PCB, then connect FPC to PCB according to connector. In fact, this kind of melting plate than hard and soft cost low. However, the connector shall occupy indoor space and shall not be less than the total area and aspect ratio of the whole IC indoor space. Therefore, it is necessary to change the cost of the interior space area, hard and soft fusion plate will shine. For example, during the dismantling of an aircraft pod, you can see that all the earphones are a complex looking fusion of hardware and software. We made a smart diamond ring and also used a hard and soft fusion plate. It should be noted that the hard board can be composed of four, six and eight layers, while the flexible circuit can only be composed of two layers. The soft and hard fusion plate can be applied to a component of pocket size and can also be bent. Especially suitable for complex shape or necessary smart home products. The only downside is it’s too expensive. How is the FPC keyboard made? There is little difference between the design process of FPC keyboard and PCB, and between the production process and PCB. First do the inner 2 FPC, then do the outer panel multilayer, finally the outer panel of the bending area to remove. But often more expensive than the hard board FPC Keyboard, keyboard keys are also due to the actual process is more complex, the damage rate is very high.