How to know the stroke of the metal dome & metal dome array?

How to know the stroke of the metal dome & metal dome array?

There are so many customers to ask this question. I know it is very important for the product design. You should leave the enough space for the metal dome & metal dome array between your PCB & cover layer.

This time follow me to clarify this question, it is very easy for us whom are specializing in this industry for so many years.

For the metal dome, you can see our 6mm diameter, four-leg shape metal dome. The total height is 0.31mm, & the thickness of the material is 0.06mm, so the stroke is 0.31-0.06=0.25mm.

The formula is: Stroke= Height – Thickness of material – Thickness of the dimple (if there is a dimple in center).

Four-leg metal dome

For the four-leg metal domes, the life cycles always have the one million times. & they are popular used in the membrane switche products.

For the metal dome array, you can see the follow picture:

The structure of the Metal dome array

You can see the 3# spacer is parallel to the 2# metal dome & the thickness is lower than the domes. So you can ignore the thickness of the spacer. The total height = Mylar + Metal dome=0.05+0.31=0.36mm. For the more detail, you can see my last blog.http://www.metal-domes.com/blog/2009/11/07/the-whole-thickness-of-our-metal-dome-arrays/

How about the stroke? In fact, it is the same as the natural metal domes. It should be ignored the thickness of the Mylar & Spacer. So you can use the above formula to calculate the stroke.

I think you are fully understand the stroke of our metal domes & metal dome arrays now. If you need further & more information, please do feel free to contact us.

Best Technology Co., Ltd

www.metal-domes.com

The whole thickness of our metal dome arrays.

This time follow me to see the whole thickness of our metal dome array products. We have two types of the metal dome arrays: Single layer & Double layers. Please see the following structure:
  Single layer metal dome array

 Double layers metal dome array

1.For the Single layer structure: the whole thickness is equal to the thickness of the Mylar & metal dome. Normally the thickness of Mylar is 0.05mm.

2. For the Double layers structure: the whole thickness is the same as the Single layer structure. You can see from the picture, it is the double layers, but the spacer is parallel to the metal dome. So that you can ignore its thickness. Normally the thickness of the spacer is 0.075mm.

If there is enough space between your PCB & cover layer by the side of your button, It means over the thickness of the Mylar & Spacer (0.05+0.075=0.125mm), we recommend you to use the most popular double layers structure. Because there have ventilation between the domes, when you press the domes, the air can ran out easily. So it will be better with click feeling.

I think you are fully understand the advantage & disadvantage of the two structures now. For more information, please feel free to contact Best Technology.