Chosen Solution
Dear experts, on mbp touchpads with taptic engine, the glass layer and sensor layer are attached each other with adhesives. And as you can see in the image below, these 2 adhered layers float on 4 metal springs which behave as pressure sensor and activate the taptic engine according to pressure level. At this point how the top layer (glass+sensor) is connected or attached with these 4 springs? Does manufacturer use the same strong adhesives for contact points of these springs and the layer over them? Can a strong horizontal force or shear force damage the bound and dislocate/slide the top layer over metal springs? Kind regards… https://guide-images.cdn.ifixit.com/igi/…
Here’s a big surprise! There is no moving parts with this series TouchPad (a.k.a. Trackpad) The glass plate has layers under it which deflect translating the finger movement across it (X-Y) as well as pressure (Z) this is all through capacitance within the plate and with the conductive grid within it that flex’s. Linus Tech Tips - Haptic Touchpad Design You are feeling taptic engines force for feedback. Update (06/13/2022) OK, I think I see the confusion, the question is how is the sandwich held together and the second part can this be sheared off. The metal pedals points are glued to the top segment with cyanoacrylate glue there is no flex in the bond. There is really no way for the top section to shift (shear off) remember there is a depression where the assembly is held.
Why such concerns? I haven’t see any fail in that way I have seen something dropped cracking the glass and the amount of force also dislodged the adhesion but at that point the part was beyond use.
