| 摘要 |
PROBLEM TO BE SOLVED: To obtain a keyboard device capable of increasing the stroke of a key top and capable of obtaining an accurate click feeling even when the keyboard device is made thin. SOLUTION: In this keyboard device, a dome-shaped invertible return spring 6 is arranged between a stem 7 constituted of an elastic body and a membrane switch 5, and when a key top 8 is depressed, the return spring 6 is depressed and inverted by the stem, and a piezoelectric element 3 is driven according to the switching of the contact of the membrane switch 5, and the driving is transmitted through the stem to the key top 8. Afterwards, the stoke of the key top is obtained when the stem 7 is elastically deformed and contracted by an inertia force with which the key top 8 is depressed.
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