We are a Custom Domes Arrays Supplier in China
Custom Dome Arrays & Dome Sheets
A metal dome array and sheet (dome arrays) is a type of glued PET array and sheet that features metal domes that can be easily peeled from release paper and adhered to circuit boards as components of electronic devices. It requires “peel and place metal domes” for proper packing. You can include either single or multiple metal domes per array based on the design, typically matching the quantity and location of the pads on the circuit board.
Dome sheets or arrays serve as a tactile interface between the user and the keyboard, consisting of pre-cut polyester adhesive domes (typically 0.05 mm thick) paired with a 0.03 mm thick sheet of acrylic adhesive.
Dome arrays are applied to the printed circuit board in a single operation after removing the liner, simplifying assembly and ensuring precise dome placement on the PCB.
The metal dome array is the most cost-effective solution for a simple switch, providing an excellent tactile interface between equipment and users. It offers a satisfying click feel, superior to the previously used membrane polyester switch, and has a significantly longer lifespan than poly dome sheets due to its metal construction.
Metal dome contacts on the arrays are aligned with the PCB contact points. When a dome is pressed, its center makes contact with the PCB, allowing electric current to flow. This is the operation of metal dome arrays. Please click our blog to see how to assemble a metal dome array on PCB.
We can manufacture metal dome arrays (sheets) in various sizes to meet customer requests. Currently, we offer the following basic types of metal dome arrays.
Custom dome arrays
In the early stages of the metal dome arrays industry, metal dome contacts were typically secured under a layer of Mylar, a type of adhesive PET film. Each dome contact featured an air hole, which was crucial for delivering a satisfying click feel. This design helped in achieving the desired tactile feedback and ensured the reliability of each keystroke.
This type of metal dome array is similar to the single-layer design with metal dome contacts attached under Mylar. However, it includes a spacer positioned beneath the metal dome contacts. This spacer creates air paths that function like single-layer air holes, enhancing the click feel when the dome contacts are pressed. Additionally, these air paths help to protect the PET film from damage caused by metal dome contact burrs and block dust from entering the PET layer, thereby increasing the durability and reliability of the switch assembly.
Electrostatic Discharge (ESD) and EMI Control in Metal Dome Arrays
In advanced metal dome array designs, several key features are integrated to enhance performance and protect electronic components. Here’s how these elements work:
1. ESD Control with Silver or Silver Carbon Paste
On top of the Mylar layer that carries the metal dome contacts, a layer of silver paste or silver carbon paste is printed. This layer serves as an Electrostatic Discharge (ESD) control mechanism. It helps to gather and neutralize electrostatic charges that could potentially damage sensitive components inside mobile phones or other electronic devices. By collecting electrostatic charges on the printed silver or silver carbon paste, this method effectively minimizes the risk of electrostatic discharge harming internal circuitry.
2. EMI Control in Metal Dome Arrays
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EMI Single Layer
For single-layer metal dome arrays, Electro-Magnetic Interference (EMI) control is achieved by printing an EMI shielding layer directly on top of the dome arrays. This single-layer EMI shield helps to reduce electromagnetic interference, ensuring that the metal dome array does not emit or receive unwanted electromagnetic signals that could disrupt device performance.
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EMI Double Layer
In double-layer metal dome arrays, the EMI control is even more robust. An EMI shielding layer is printed on top of the second layer of the metal dome arrays. This double-layer approach provides enhanced protection against electromagnetic interference, making it ideal for more sensitive or higher-performance applications where superior EMI shielding is required.
These enhancements in metal dome arrays not only improve tactile feedback and durability but also ensure that electronic devices operate reliably by mitigating risks associated with electrostatic discharge and electromagnetic interference.
Rubber Glue Layer in Metal Dome Arrays: Enhancing Adhesion and Performance
In advanced metal dome array designs, a layer of rubber glue is applied on top of the Mylar or EMI layer. This additional layer offers several benefits:
– Adhesive Strength: The rubber glue provides excellent adhesion, ensuring that the metal dome array remains securely attached to the keypad or PCB. Its strong bonding properties prevent shifting or detachment, even under regular use.
– Plastic Performance: The rubber glue is designed with special plastic properties that enhance its flexibility and durability. This ensures that the glue maintains its adhesive qualities over time, adapting to the mechanical stresses and movements of the device.
– Enhanced Protection: By applying rubber glue on top of the Mylar or EMI layer, the assembly gains an extra layer of protection. This helps to keep the metal dome contacts securely in place while also safeguarding against environmental factors such as moisture or dust.
– Improved Integration: The rubber glue layer ensures seamless integration between the metal dome array and the underlying keypad or PCB. This integration contributes to the overall reliability and performance of the device, providing a consistent tactile feedback experience for the user.
Overall, the inclusion of a rubber glue layer enhances the effectiveness and longevity of metal dome arrays, ensuring that they provide reliable performance and strong adhesion in electronic devices.
LGF stands for Light Guide Film. Adding an LGF to a standard double-layer or EMI dome array creates an LGF dome array, which significantly improves light distribution.
Custom Designs dome arrays
Dome Array Features
Chemical, weather & vandal resistance
Ø 3 to Ø 6 mm
100 g to 250 g actuation force
Typical life greater than 1M cycle
Dimple and non-dimple versions available
Round, Side Cut, Legged
Dome plating options available
Dome Array Benefits
Automated processes deliver extremely low unit cost
High capacity available
Customized solutions to suit custom assembly
Market proven product, billions supplied
High reliability products
Flexible process supports smooth product launch
Prototypes available within 2-3 days of drawing receipt
Dome Array Options
Full range of size and tactile forces available
Different domes on same array
Optional integrated actuator
Dimple and plating available
Optional ESD printing
Can be supplied as part of an assembly with key mat and light guide foil
Metal Dome Array Applications
Metal dome arrays are applicable across nearly all industries, including:
- Industrial
- Electronic
- Automotive
- Military
- Medical
- Agriculture
- Appliances
- Consumer electronics
- Transportation
- Aerospace
- Oil and Gas
The tactile feedback from a metal dome array is applicable across various industries, but it is most effective in consumer devices, industrial applications, military use, and medical scenarios.
How Can We Help?
In addition to our Quote Form, we are always available for an in-person meeting or conference call to discuss the design and project in greater detail.
SHANYO’s sales force extends across the entire country, so please contact us directly and we will put you in touch with your local sales representative. Complimentary samples of our products are also available upon request.
We have a team of skilled engineers ready to support you in your product development journey from prototyping to production.
When you’re ready to start your next project, simply upload your 3D CAD design files, and our engineers will get back to you with a quote as soon as possible.
200,000+ Unique parts produced
Contact Details
Address:
Factory No. 20, Tianhe Industrial Park, No. 252 Weihe Road, Qingdao Economic and Technological Development Zone
Weihe Road, Qingdao Economic and Technological Development Zone
Shandong, China, 2665
Tel:
Mingyang Zhang
+86-15764238133
Email:
shanyonod@gmail.com