| 摘要 |
PROBLEM TO BE SOLVED: To provide a keyboard device which suppress generation of abnormal noise with simple constitution and improves the detection accuracy of driving operation. SOLUTION: A switch substrate 7 is provided with first key switches 8 by each of respective keys 1. The upper parts of a movable portion 80 of the key switches 8 are formed as cylindrical portions (crown portions 82) and inner spaces (hollow portions 82b) closed exclusive of opened upper parts (outer cylinders and bottoms) are formed in the crown portions 82. The top surfaces 82a of the crown portions 82 are provided with a plurality (for example, 8 pieces) of subulate small protrusions 84 at uniform intervals apart suitable spacings with each other over the entire circumference which are integrally molded with the movable portions 80. In key touch and release, the spacings between the small protrusions 84 assure air inflow paths for the inside and out of the hollow portions 82b and since the hollow portions 82b are not hermetic spaces, the driving surfaces 1a of the keys 1 are not attracted to the top surfaces 82a of the crown portions 82. |
