Membrane key switch for mining instrument and method for making its shielding layer
A manufacturing method and shielding layer technology, applied in the direction of electric switches, printed circuit manufacturing, conductive pattern formation, etc., can solve problems such as susceptibility to radio frequency and static electricity interference, difficult anti-electromagnetic shielding interference measures, key misoperations, etc., to reduce Electromagnetic interference, guaranteed electromagnetic shielding effect, high electromagnetic shielding efficiency effect
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[0035] See figure 1 and figure 2 , a mine meter membrane key switch of this embodiment is composed of a printed circuit board 1 and a membrane key panel 2 covered on the printed circuit board 1; the printed circuit board 1 is followed by a ground layer 11 and a power layer 12 and several signal layers 13; the thin film key panel 2 from top to bottom are: first protective layer 21, PET substrate 22, pattern layer 23, shielding layer 24, second protective layer 25, conductive adhesive layer 26 and key pad Layer 27; PET substrate 22, pattern layer 23, shielding layer 24, second protective layer 25 and conductive adhesive layer 26 are provided with at least one process via 28, shielding layer 24 and conductive adhesive layer 26 are connected; printed circuit board 1 The ground layer 11 is connected to the shielding layer 24 of the membrane key panel 2 . The first protective layer 21 and the second protective layer 25 are UV ink; the shielding layer 24 is conductive paste. The ...
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