Patent ID: 7199320

Claim:
A key switch device, comprising: a board member; a key top member; a first bearing member, provided on one of an upper face of the board member and a lower face of the key top member; a first guide member, provided on the other one of the upper face of the board member and the lower face of the key top member; a first link member, disposed between the board member and the key top member, and having a first end portion rotatably supported by the first bearing member and a second end portion engaged with the first guide member; a second bearing member, provided on one of the upper face of the board member and the lower face of the key top member; a second guide member, provided on the other one of the upper face of the board member and the lower face of the key top member; and a second link member, disposed between the board member and the key top member, and having a third end portion rotatably supported by the second bearing member and a fourth end portion engaged with the second guide member, wherein: the first link member is pivotable in a first direction about the first end portion thereof to allow the key top member to move in a vertical direction; the second end portion of the first link member is slidable relative to the first guide member in a first horizontal direction in accordance with the movement of the key top member; the second link member is pivotable in a second direction orthogonal to the first direction about the third end portion thereof; and the fourth end portion of the second link member is slidable relative to the second guide member in a second horizontal direction orthogonal to the first horizontal direction in accordance with the movement of the key top member.