Patent ID: 7499031

Claim:
A keypad disposed on a surface of an electronic device, comprising: a first key, comprising: a first front body; and a first back body disposed on the backside of the first front body, wherein the edge of the first back body has a first protruding portion protruding out of the edge of the first front body with the terminal of the first protruding portion being wider than the junction of the first protruding portion and the edge of the first back body; and a second key, comprising: a second front body; and a second back body disposed on the backside of the second front body, wherein the edge of the second back body has a first indentation corresponding to the first protruding portion, a base of the first indentation is wider than an opening of the first indentation, the shape of the first indentation and the shape of the first protruding potion are similar, the first indentation exposes a part of the backside of the second front body, the first protruding potion and the first indentation are trapezoid-like structures, the length of the first protruding potion is substantially equal to the depth of the first indentation, the terminal of the first protruding potion is wider than the opening of the first indentation, and the first protruding portion is surrounded by the first indentation and fully contacts with the edge of the first indentation when the first protruding potion and the first indentation are buckled up with each other tightly so that the first key and the second key are fastened together firmly.