| 摘要 |
The vibrating device ( 1 ) is mounted in a portable object, such as a wristwatch, to act in particular as a silent alarm. The device includes a moving mass ( 3 a , 3 b , 6, 15 ) formed in part by a magnetic structure connected to a fixed structure ( 5 ) via a spring element ( 4 ), and a coil ( 2 ) connected to the fixed structure without any mechanical contact with the moving mass. The coil is electro-magnetically coupled to the moving mass to enable it to oscillate in at least one direction of oscillation (X) when it is being powered by alternating electrical signals at a determined frequency. A fixed part of the vibrating device includes a part ( 4 d) forming part of the spring element, which is mounted on the fixed structure. This part includes a longitudinal aperture ( 14 ) in the direction of oscillation combined with a surface of the fixed structure to define guide means in which a projecting element ( 16 ) of the moving mass is placed. This longitudinal aperture is dimensioned so as to allow the moving mass to oscillate freely in a normal operating mode of the vibrating device ( 1 ) at least up to a determined maximum amplitude value. However, the aperture limits the movement amplitude of the moving mass in a determined manner in all directions, to protect the vibrating device from mechanical shocks.
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