Key structure

A key structure, comprising:

• a bottom plate comprising at least one elastic protruding portion;
• at least one keycap liftably connected to the bottom plate and comprising a press portion and at least one trigger portion, wherein the press portion is located in a central region of the at least one keycap and faces the at least one elastic protruding portion, and the at least one trigger portion is located in a peripheral region of the at least one keycap, wherein when the at least one keycap is lowered from a first position to a second position relative to the bottom plate, the press portion downwardly presses the at least one elastic protruding portion, and the at least one keycap is adapted to restore from the second position to the first position through an elastic force of the at least one elastic protruding portion;
• and
• a thin-film circuit board disposed on the bottom plate and located between the bottom plate and the at least one keycap, wherein the thin-film circuit board comprises at least one electrical trigger point, and the at least one trigger portion faces the at least one electrical trigger point, wherein when the at least one keycap is located at the second position, the at least one trigger portion triggers the at least one electrical trigger point.