The LED Embedded Membrane Switch Keypad Has Two Structures of LED Circuit and Lower Circuit In the Same Layer and Different Layers

The structure of the same layer of the LED circuit and the lower circuit is relatively simple, but the LED window needs to be convex, otherwise, the LED lamp will lift up the panel, and the LED is also easily damaged by heavy pressure. The 0603 LED is shorter but the pad is smaller. It is difficult to solder. The height of the 0806 LED is commonly 0.8mm. The pad is large and the virtual soldering is less; the structure of the LED circuit and the different layers of the lower circuit is relatively complicated. If the thickness of the overall membrane switch keypad is thick, the LED window It is not necessary to be convex.

There are two types of waterproof membrane keypad structures. The waterproof structure is generally designed as a zigzag embedded structure. One structure is the same material. The finished product is divided into two parts, and the circuit part is embedded in the panel part to form a product. This structure is more commonly used, each layer of glue must use waterproof glue; another structure is to use the thickness of the upper and lower circuits and the isolation layer, and the outer frame structure of the membrane switch keypad with the panel, the circuit part is embedded inside to do Into a whole. Waterproof glue can generally use 3M9495LE or 3MGTM920.

The light guide type structure means that the light guide sheet is embedded in the conventional membrane switch keypad, and the side light LED is used to light the button (EL cold light sheet can also be used). The membrane switch keypad can be used at night and in places with insufficient light, which is more ornamental. When making light-guided membrane switch keypads, it is necessary to consider that the panel and the side of the membrane switch keypad must not leak light and cross light. All double-sided adhesives should use black adhesive. After adding the light guide, the button feel will become weak, and a gasket is added to the back of the button position on the panel to enhance the feel.

The double-folded structure is also considered to be used when there are a large number of buttons and the overall shape is small, and there is no space for wiring. It is designed as an upper and lower circuit structure. This structure pays special attention to the folding process to be carried out under heating, taking into account the service life The effect of the increase on the bend.

Each structure has its own characteristics. At the beginning of the design, the most suitable structure is selected to produce high-quality products and serve the majority of users. If you need to custom membrane switches, please feel free to contact Niceone-tech membrane keypad manufacturer.