A dome array, often referred to as a domed array or tactile metal dome arrays. It is a type of tactile switch technology commonly used in electronic devices, particularly in membrane keyboards and other input devices.
What is a Dome Array?
A dome array consists of a set of single metal domes, typically made from metal or polycarbonate, arranged in a specific pattern on a flexible substrate. Each dome acts as a switch, which, when pressed, collapses and makes contact with a conductive layer underneath, completing an electrical circuit.
When a user presses a dome, it collapses and makes contact with the conductive layer below, completing the circuit. This action generates a signal that is sent to the device’s control system, registering the press. Once the pressure is released, the dome returns to its original shape, breaking the contact and resetting the switch.
What is the Structure of Metal Dome Array?
Metal dome array, generally, is double layer structure. Its structure from the top to the bottom is as follows.
- Mylar: it is the uppermost layer and transparent, and generally its thickness is 0.05mm;
- Spacer: it has two colors, including transparent and white; generally, its thickness is 0.075mm, 0.0125mm and 0.010mm;
- Metal Dome: The central component, usually made from stainless steel or polycarbonate. It has numerous types, including round/circle metal dome, triangle metal dome, oblong metal dome and 4-legs metal dome. Each one has different shapes and specifications.
- Adhesive: the thickness ranges from 0.02mm to 0.05mm.
- Release paper: it is the lowermost layer, playing the role of protecting the dome array, and will be the waste after being tearing down.
Dome Array vs Metal Dome
Dome array is different with metal dome. It mainly manifested in that metal dome is a single, standalone dome switch made from stainless steel. While dome array consists of one or multiply metal domes. Metal dome is specially designed to provide tactile feedback when pressed. Here is a basic comparison chart between them.
| Feature | Dome Array | Metal Dome |
| Material | Metal or polycarbonate domes | Primarily stainless steel |
| Structure | Multiple domes on a flexible substrate | Single piece |
| Applications | Membrane keyboards, remote controls, input devices | Consumer electronics, medical devices, industrial controls |
| Advantages | Multiple switches, flexibility, integration | Durability, tactile feedback, long lifespan |
| Disadvantages | Complex assembly, potential wear | Single function, less flexible |
| Use Case | Devices requiring multiple inputs | High-durability requirements, clear tactile feedback |
Where Metal Dome Array Will Be Used In?
Dome arrays have a widely applications in control devices due to their reliability and cost-effectiveness. You may see it everywhere in our daily life. Here Best technology listing some common fields that dome arrays will be used in and their specific uses.
- Membrane keyboards
- Remote controls
- Consumer electronics
- Medical devices
- Automotive controls
- Point of sale (POS) systems
- Home appliances
- Industrial equipment
- Telecommunications
- Fitness equipment
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