| 摘要 |
PURPOSE: To efficiently drive a signal annunciator by frequency sweep-driving a vibration module from the low frequency to the high frequency in the signal annunciator attached to a portable equipment such as a pocket bell, and for generating an annunciating signal by vibration instead of calling by the sound of an electronic buzzer. CONSTITUTION: A vibration module 10 of a signal annunciator by vibration is provided with a driving circuit 60 for sweep-driving the frequency from the frequency lower than the frequency on the low frequency side in which the hysteresis is to be generated to the high frequency side so that the driving frequency may be monotonously increased, and the driving circuit is provided with a driving part 610 composed of a driving signal generating part 620 having the function for generating the driving frequency and forming the waveform and an amplifying part 630, and a sweep signal generating part 680. The sweep signal generating part 680 is for controlling the transmitting frequency of the driving signal generating part 620, and the driving signal generating part 620 generates the driving frequency continuously changed from the frequency lower than the sweep signal voltage of the sweep signal generating part 680 to the high frequency. |
