Key switch with noise reduction capability and assembly method thereof

A key switch with noise reduction capability, the key switch comprising:

• a base comprising:
• a base body;
• a first extending arm comprising a first horizontal extending portion, a first vertical extending portion and a first hook, the first horizontal extending portion being connected to the base body and substantially extending along a first direction, the first vertical extending portion being connected to the first horizontal extending portion and substantially extending along a second direction perpendicular to the first direction, and the first hook being connected to the first vertical extending portion and substantially extending along a third direction perpendicular to the first direction and the second direction;
• and
• a second extending arm comprising a second horizontal extending portion, a second vertical extending portion and a second hook, the second horizontal extending portion being connected to the base body and substantially extending along the first direction, the second vertical extending portion being connected to the second horizontal extending portion and substantially extending along the second direction, and the second hook being connected to the second vertical extending portion and substantially extending along a fourth direction opposite to the third direction;
• a key cap disposed above the base;
• a supporting mechanism disposed between the base and the key cap, an upper end and a lower end of the supporting mechanism being connected to the key cap and the base respectively to allow the key cap to move relative to the base upwardly and downwardly;
• a link bar comprising an upper linking end and a lower linking end, the upper linking end of the link bar being movably connected to the key cap;
• a buffer member comprising a buffer longitudinal axis, a recess structure, a first engaging portion and a second engaging portion, the buffer member being made of material softer than material of the base, the first engaging portion and the second engaging portion being located at two opposite ends of the buffer longitudinal axis, the buffer longitudinal axis being parallel to the third direction and the fourth direction substantially;
• and
• a circuit board comprising a switch, the switch being activated selectively according to upward and downward movement of the key cap relative to the base;
• wherein the base and the recess structure are adjacent to form a restraining structure when the first engaging portion and the second engaging portion engage with the first hook and the second hook respectively, the lower linking end movably passes through the restraining structure, and when the key cap moves relative to the base upwardly and downwardly to drive the lower linking end to move within the restraining structure correspondingly, the buffer member restrains an upper surface of the lower linking end, so as to reduce noise during movement of the lower linking end relative to the base.