| 摘要 |
PROBLEM TO BE SOLVED: To increase the degree of freedom of design and to lower the cost by effectively utilizing the space below a key. SOLUTION: A rubber sucker 72e-1 is formed on the top surface of the contact rubber 72 of a key switch 7 arranged on a circuit board 5. A flat plate 21b is fitted onto the reverse surface of a white key 21. The flat plate 21b is sucked by the rubber sucker 72e-1 and the upper end of the contact rubber 72 is fixed to the white key 21. The upper end of the contact rubber of a key switch 6 is also fixed to a black key 11. The upper dead point of the contact rubber 72 is regarded as the upper limit of the white key 21 to omit a key stopper. The fulcrum part 22 of the white key 21 and the fulcrum part 12 of the black key 11 are made wider than respective keys and made rigid in the key and body directions to eliminate a key guide. |
