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Do you know what reasons for METAL DOME DIED KEYPAD ?

   

 2020/3/17 12:19:49     126

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Do you know what reasons for METAL DOME DIED KEYPAD ?


Normally , we called such phenomenon of when after we push down the Metal dome ( also named snap dome , dome switch) ,

and found it wont work , which is DIED KEY Phenomenon .  this is Critical Function problem .

Then what is the Root cause of it , Hereinafter we will make a analysis :

1、 Normally the Metal dome ts thickness is around 0.06mm, its lifetime 500k~1500k shots (depend on stroke requirement) , It will have DIED KEY phenomenon happened after lifetime over given hits twice ;

2、 Generally , designed force≧40gf, after lower value 40gf, lifetime is up to limits , it will have DIED KEY phenomenon happened ;

3、 Material is stainless steel , its thickness is approximate to range0.06~0.1mm】,stroke is around 100~300gf, after stroke is exceed over 2X , it will have DIED KEY phenomenon happened ;

4、 Removal PET protection membrane before stick the Metal dome array on the PCB, Or in the manufacturing process of Metal dome array ,  if there is FOLD problem , it also will have DIED KEY phenomenon happened . (metal dome damage , fold or any changes due to outside force)

5、  There is no Venting slot design , air cant pull out smoothly when push down , it also will cause FAKE DIED KEY problem .

6、 NO traveling stroke reservation , Silicon rubber or rubber guide push on the appearance of metal dome , it will reduce metal dome lifetime and have function problem .




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