What is a Single Layer Metal Dome Array and how does it differ from a Double Layer Dome Array?
A single layer metal dome array consists of individual stainless steel tactile domes placed on a single pressure-sensitive adhesive polyester (PET) carrier sheet, backed with a protective release liner. In contrast, a double layer array adds an extra die-cut spacer layer beneath the top carrier tape. Single layer arrays are thinner (0.12mm to 0.20mm base profile), more economical, and faster to assemble. Double layer arrays add a slight spacer thickness, providing isolated air chambers for specialized high-moisture or washdown environments.
Why are air vent channels necessary in single layer dome arrays?
When a metal dome snaps downward against a PCB pad, the air inside its concave chamber is compressed. Without dedicated air vent conduits cut into the adhesive carrier film, this compressed air creates back-pressure that deadens tactile click feedback and can cause air lock, preventing the dome from returning. In cold conditions, trapped air can also cause moisture condensation. Cevra cuts micro-venting channels connecting adjacent dome cavities, allowing smooth air displacement while maintaining an effective perimeter dust seal.
What causes double clicking or dome floating, and how is it prevented?
"Double clicking" occurs when an actuator presses a dome off-center or when an undersized actuator pinches the dome edge before reaching the center, creating two distinct mechanical snaps. "Floating" occurs when adhesive bonds weaken under shear stress or poor peel-tack conditions, allowing the dome to shift off its target PCB contact pad. Cevra eliminates both issues using high-tack acrylic adhesives tested on holding tack analyzers, precision CCD positioning with ±0.05 mm accuracy, and custom actuator design guidance.
Which plating option is better for metal domes: Nickel or Gold?
Standard bright nickel plating provides reliable protection against oxidation, handling over 1,000,000 actuations with contact resistance typically under 100mΩ, making it the most cost-effective choice for consumer electronics and industrial keypads. Flash gold plating over nickel provides lower contact resistance (<20mΩ), resists galvanic corrosion, and is recommended for low-voltage signal circuits, medical devices, defense systems, and environments exposed to corrosive gases.
What design files and specifications are needed to receive a custom quote?
To provide a formal engineering DFM review and quotation within 24 hours, our engineering team requires: (1) 2D vector CAD drawing (DXF, DWG, AI, or 1:1 scale PDF) showing dome centers, outline boundaries, alignment holes, and keep-out zones; (2) Preferred dome size (e.g., 8.4mm, 10mm, 12mm 4-leg cross or round); (3) Target actuation force (e.g., 250g, 350g, 400g); (4) Plating preference (nickel vs. gold); and (5) Estimated prototype and production batch volumes. Send files directly to [email protected].
What is your minimum order quantity (MOQ) and production turnaround time?
As a direct manufacturer, Dongguan Cevra Electronic Technology Co., Ltd. supports new product introduction (NPI). Prototype and pilot-run quantities for custom single layer metal dome arrays start from as low as 100 pieces, with tooling and sample delivery completed within 5 to 7 business days. High-volume production batches (from 1,000 to over 500,000 sheets) are fulfilled in 10 to 14 business days, with full quality inspection records and material certifications included.
