A metal dome array & sheet (dome array) is a kind of PET sheet that carries metal dome contacts. It is applied to FPCBs to function as switches of mobile phones and electric home appliances. The dome array (metal dome array)is the most cost effective solution for a simple switch with a superior tactile interface between your equipment and the user. Compared to the membrane polyester switch which was formerly used, it gives good click-feeling. It also gives much longer lasting life span compared to poly dome sheets. It also takes place of down going productivity of tact switches with its potential productivity.
Metal dome contacts on the arrays (sheets) are positioned over the contact point of PCBs. When a dome is pressed, the center of it contacts to the PCB and let the electric current flow through. This is how metal dome arrays work.
It is possible to manufacture metal dome arrays (metal dome sheets)with various size and weight to meet customers' request. And of course it's possible to be developed into various types followed by customers' requests. At present, we make the following basic types of metal dome arrays.
1) Single layer dome array
This type is used in the early period of metal dome arrays (dome arrays) industry. Metal dome contacts are attached under Maylar (one layer of adhesive PET film). On the sheet, there is an air hole for each dome contact and it is essential for good click-feeling.
2) Double layer dome array
This type is somehow similar to single layer type by means of metal dome contacts attached under Maylar. But the difference is that, in this type, the Spacer is attached under the metal dome contacts. Air paths which function like air holes in single-layer, helps provide good click-feeling when dome contacts are pressed. Besides this effect, air paths help reduce the chance for PET film being damaged by metal dome contacts' burr and block dust coming into PET films.
3) EMI Printing dome array
On top of the Mayler which carries metal dome contacts, silver paste or silver carbon paste is printed as ESD (Electrostatic Discharge Control). This
helps reduce electrostatic which might be harmful to other parts inside of mobile phones. Electrostatic is gathered on the printed silver paste
or silver carbon paste and neutralized.
EMI Single layer
EMI is printed on top of single-layer metal dome arrays (dome arrays).
EMI Double layer
EMI is printed on top of double-layer metal dome arrays (dome arrays)
4) Rubber Glue dome array
There's one layer of Rubber Glue on top of the Mayler or EMI. It has special Plastic performance and can be tightly stick on Keypad or PCBs.
5) Custom Designs dome array
Mobile phone market
Handheld / PDA
Point of Sale Terminals
Automotive: Telematics, Window controls, Seat controls & Steering wheel systems Remote Keyless Entry system (RKE)
Consumer Goods: MP3 players, Digital cameras, Camcorder, Portable CD players, Toys Cordless Phones
White Goods: Microwave, Dishwasher, Dryer, Commercial scales, Small appliances Medical
Others: Entertainment, Office, Security systems, Industrial, Telecom Handheld instruments