::::HANTECH PRODUCTS:::: =========================== ▒ Metal Dome ===========================  R-Series  RDP-Series  RCC-Series  DR-Series  DRDP-Series  DRCC-Series  4L-Series  RL-Series  SMD-Series =========================== ▒ Metal Dome Sheet Ass'y ===========================  NAVI Key  Main Key   - Sheet Type   - Reel Type   - Normal Type   - EMI Type   - Dome Sheet-PCB Ass'y  Side Key =========================== ▒ Flexible PCB ===========================  Flexible PCB   - Single-sided circuits   - Double-sided   - Multi-layer  Rigid-flex Circuit Board  Rigid PCB ........................................ HOME > Support >FAQ       The dimple is a 400 μm diameter boss at the center of dome inside, designed to better the surface contact avoiding dust or foreign material interference. The idea making use of dimple has been developing to circle-type dimple, reverse-dimple and the like.   While round-type domes are preferably applied in those state-of-art portable communication industries like mobile phones, 4-leg domes structurally designed to support single sided circuit is recommended for simpler appliances using single sided circuit or membrane switch.   Over-travel means metal domes over-traveling past the level of dome's rim, while most domes are designed to be depressed to the level, no further. Our 5mm diameter or larger round domes are designed to allow an additional 0.100mm over-travel/over stroke past the flat plane with no damage.   Our reel-type domes could be applicable to your automated system, while there are a few different ways of automating dome array. Please contact us for more details about RL-series domes.   Too many different sizes and shapes are there optional for better tactile feel but a flat-bottom plunger diameter larger than Φ 2mm is not desirable for any types of 6mm diameter or smaller domes and 1.6mm or smaller diameter flat-bottom plunger is recommended for the domes smaller than Φ 4.5mm.   Individual dome chips can't be placed on circuit board without being aided by pressure-sensitive adhesive tape and in this respect the metal dome sheet is the best way to most simply and easily apply metal domes. Metal dome sheet is the simplest way of mounting domes on circuit board by manual or auto peel-n-place method.   Absolutely not. When the domes are depressed, the rim/feet of dome slightly expands outward; therefore, if the rim or feet of dome is soldered to be fixed, the domes natural movement will negatively affect the tactile feel or, in cases, cause detachment of dome.   The life span is largely subject to test condition. Officially we guarantee 5 hundred-housand cycles for most metal domes at 600g loading but substantially our test reaches up to more than 1 million cycles at 600g and 3 million cycles at 300g loading.   We have a local factory in Shenzhen China, established in April of 2004, where we are providing metal dome sheet assembly with a competitive price condition on inland dealing basis.