Long-type key structure

A key structure, comprising:

• a keycap;
• a base plate;
• and
• a supporting element comprising:
• an outer scissor frame comprising a first end and a second end opposed to the first end;
• at least two inner scissor frames, wherein each of the at least two inner scissor frames comprises a third end and a fourth end opposed to the third end, the at least two inner scissor frames are pivotally coupled to the outer scissor frame and permitted to be swung relative to the outer scissor frame;
• a metallic reinforcement plate with a shape and a structure matching the outer scissor frame, wherein the metallic reinforcement plate is combined on a surface of the outer scissor frame;
• and
• a metallic reinforcement bar, wherein the metallic reinforcement bar is installed on a bottom surface of the keycap and circumferentially arranged beside a long side and a short side of the keycap,
• wherein a raised platform structure is formed on the bottom surface of the keycap and arranged beside the short side of the keycap, and a portion of the metallic reinforcement bar beside the short side of the keycap is pushed by the raised platform structure, wherein a distance between a top surface of the short side of the keycap and the metallic reinforcement bar is larger than a distance between a top surface of the long side of the keycap and the metallic reinforcement bar,
• wherein the first end and the third end are connected with the keycap, and the second end and the fourth end are connected with the base plate, so that the keycap is movable upwardly or downwardly relative to the base plate.