| 摘要 |
A first bearing member is provided on a key top. A second bearing member is provided on the key top. A first guide member is provided on a board. A second guide member is provided on the board. A first link member is disposed between the board and the key top, and has a first end portion rotatably supported by the first bearing member and a second end portion engaged with the first guide member. A second link member is disposed between the board and the key top, and has a third end portion rotatably supported by the second bearing member and a fourth end portion engaged with the second guide member. A third link member is disposed between the board and the key top. The first link member, the second link member, and the third link member are not in contact with each other. The second end portion is slidable relative to the first guide member in a first horizontal direction so that the first end portion is movable in a vertical direction. The fourth end portion is slidable relative to the second guide member in a second horizontal direction opposite to the first horizontal direction so that the third end portion is movable in the vertical direction. The first link member and the second link member are symmetrically arranged.
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