Notifying device and wireless communications system...

B - Operations – Transporting – 06 – B

Patent

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B06B 1/04 (2006.01) B06B 1/02 (2006.01)

Patent

CA 2318568

An alerting device which has an alerting unit (2) with a built-in vibrator resonated when receiving a driving signal and a signal generating circuit (5) which supplies a driving signal to the alerting unit (2). The signal generating circuit (5) generates the driving signal Dv whose frequency varies within a certain frequency range containing the resonance frequency of the vibrator and supplies the driving signal Dv to the alerting unit (2). The variation width of the frequency of the driving signal is predetermined in accordance with the variation width of the resonance frequency which is caused by the tolerances of the factors determining the resonance frequency. Further, the driving signal has an alternating rectangular or sinusoidal waveform and its frequency varies within a range of 1.37 - 2.98 Hz periodically. By the alerting device, a sufficient alerting effect can be obtained regardless of the variation of the resonance frequency of the vibrator.

La présente invention concerne un dispositif d'avertissement comportant une unité d'avertissement (2) présentant un vibreur incorporé qui résonne lorsqu'il reçoit un signal de commande, et un circuit générateur de signaux (5) qui fournit un signal de commande à l'unité d'avertissement (2). Le circuit générateur de signaux (5) émet le signal de commande Dv dont la fréquence varie dans une certaine plage de fréquences comprenant la fréquence de résonance du vibreur, et fournit le signal de commande Dv à l'unité de commande (2). L'ampleur de la variation de la fréquence du signal de commande est prédéterminée en fonction de l'ampleur de la variation de la fréquence de résonance due aux tolérances des facteurs déterminant la fréquence de résonance. Par ailleurs, le signal de commande a une forme d'onde rectangulaire ou sinusoïdale alternée, sa fréquence variant périodiquement dans une gamme comprise entre 1, 37 et 2,98 Hz. Ainsi, on peut obtenir un dispositif d'avertissement suffisant quelle que soit la variation de la fréquence de résonance du vibreur.

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