Introduction Of Metal Dome Array

Metal dome array is a piece of PET sheet containing metal shrapnel (pot slice), which is used as a switch on PCB or FPC and other circuit boards. It plays an important role of touch switch between the user and the instrument. Compared with traditional silica gel keys, membrane keys have a better feel, longer life, and can indirectly improve the production efficiency of various types of switches using conductive films.

Dongchen is a professional custom metal dome array manufacturer in China, which can produce non-standard metal dome array (membrane switch) according to customer requirements. In fact, these products are made according to the drawings or requirements of customers, and there are no so-called standard parts or stocks. However, we can be divided into four categories according to the product structure:

1. Single layer structure

This is the simplest structure at the beginning. The metal shrapnel is located under Mylar (a layer of PET with glue), and there are vents to ensure the basic feel and use.

2. Double-layer structure

Unlike the single-layer conductive film, it has an extra layer of Spacer (spacer), the shrapnel is better attached to the Mylar, and maintains good contact with the circuit board, and has a better feel (something similar to a membrane switch In addition, the air vents on the double-layer structure conductive film can more effectively prevent the PET layer from being scratched by the burrs of the shrapnel, and also prevent dust from entering the PET layer.

3. EMI printing

On the top of Myalr (viewed from the front of the product) is printed a layer of silver paste - that is, ESD (Electrostatic Discharge Control). EMI is mainly used to prevent static electricity generated by electronics and peripheral products from damaging the target electrical appliances.

4. Rubber glue

Paste a layer of Rubber glue (silicone) on the Mylar or EMI layer, so this type of product can firmly adhere to the customer's silicone.

Metal dome array is mainly used in mobile phones, Internet phones, various remote controls, MP3/MP4, radios, digital cameras, learning machines, game control keyboards, microwave ovens, car dashboards, binoculars, toys, etc. Compared with the polyester membrane switch used before, it has a better hand feeling and a longer service life.