Metal Dome & Dome Array – Best Technology

One key dome array means the dome array with only one metal dome(snap dome), this commonly used in only one button or key switches. Below some info FYI

1.The size for metal dome can be 3-16mm, size for the dome array is 2-4mm larger than metal dome size. Usually the square dome array and round dome array are most used. Also your customed design can be accepted, just send us drawings for evaluation.

2.Shape for metal dome, round, four-leg, triangle, oblong all are ok for one key metal dome array, except triangle metal dome with legs.

3.single layer or double layer,white or clear(transparent),it depends on your requirement.

Below are some pics of one key metal dome array FYI. If you still have some questions about it,just contact with us or send us your design for evaluation.

Are you clear about the meaning of force, Re-force and click ratio? Please see below for details.

Snap dome force is that the the force when you press down the snap dome to contact the pcb. It should be stability of the force in order to ensure quality of the snap dome.

Re-force is the pressure let the snap dome return back to top.

Click ratio=(Force-Re-force)/Force*100%, the click ratio is narmal between 35%-75%

If you want to know more details about snap dome, please contact us for more information.

The movement of air is called venting and is important for dome array sheet work.

If there is no venting(air channel),it will affect the click feeling and switch functions.Even though it is not needed for every product,It is desirable in almost all applications.When you press the metal dome,the air is trapped. So in order to avoid the affect of compress air underneath,the air channel is recommended.

There are different ways to design the venting.

1)      air venting on spacer between metal domes

2)      Can be top vented on Mylar

3)      Air venting can be designed on pcb board.

Anyway,the incorrect metal dome sheet design will affect the functions and click feeling.So if you need some help about it,just contact with us.

As you know, the triangle metal domes are divided into two types, with legs or without legs.

Triangle metal domes without legs can be made with metal dome array. While the metal dome with legs can not be done, this is only we can make the legs inserted into the printed circuit board holes, and then bend on other side, it can be fixed.

For no legs triangle metal domes with adhesive sheet, you can design one key or several KEYS according to your PCB layout.

For triangle metal domes with legs, you also have several choices.

Leg size,0.8*0.8mm,  0.8*1.5mm,  0.8*3.0mm

If you need to know more details of the triangle metal domes, please feel free to contact us.

Maybe you are looking for some small size metal domes,do you know the minimum diameter of metal dome we can make?

Below diameter of small metal dome are most used.

1, circle metal dome: 2.5 mm diameter,

2, four-leg metal dome: 5mm diameter

3, triangle metal dome: 4 mm, diameter

4, oblong metal dome: 4 mm.

We have different forces for your choice,from 100g to 400g,what is your requirement?please just contact us.

Some customers feed back the conduction of metal dome is not good, ask us what reasons. Mainly six reasons in the following, we also provide the solutions of each.

(1) Factor: contact side of metal domes has dirty;

Solution: clean the dirty, or replace the dirty metal dome.

(2) Factor: the metal domes can’t touch product when pressed;

Solution: Change the height of products or add height of metal domes

(3) Factor: The shape of metal dome is not match with PAD of board;

Solution: Re-design the pad base on the shape of metal dome or change the type of metal dome.

(4) Factor: Maybe have double metal domes;

Solution: find double metal domes and remove one.

(5) Factor: Gold finger of PCB board is oxidized;

Solution: Check PCB and replace.

(6) Factor: Metal domes can’t be pressed down, because of “ear” of EMI metal dome array;

Solution: Change position of “ear” or increase the height of the metal dome.