Fluid sending apparatus

A fluid sending apparatus comprising:

• one or more vibrating units,
• at least one driving mechanism that includes a diaphragm to apply sending force to fluid, the driving mechanism vibrating the diaphragm;
• and
• a signal generator including:
• a drive signal processor configured to generate a signal to vibrate the diaphragm,
• and an amplifier amplifying the signal generated by the drive signal processor and transmitting an amplified signal to the driving mechanism,
• wherein the drive signal processor and the amplifier are configured to:
• supply the amplified signal driving the diaphragm that applies the sending force to the fluid, the amplified driving signal being an uninterrupted single wave consisting of a single positive voltage component and a single negative voltage damping component, the single positive voltage component and the single negative voltage damping component each having a one-sided waveform and together forming the uninterrupted single wave,
• move the diaphragm from a resting position by driving the diaphragm in accordance with the one-sided waveform of the single positive voltage component of the amplified signal driving the diaphragm, and
• return the diaphragm to the resting position by driving the diaphragm in accordance with the one-sided waveform of the single negative voltage damping component of the amplified signal driving the diaphragm,
• wherein the single positive voltage component consists of a rising component of continuously increasing voltage in a positive voltage direction which increases up to a maximum voltage value, and a falling component extending from the maximum voltage value and having a continuously decreasing positive voltage and terminating with an initiation of a falling component of the single negative voltage damping component, a formation time of the single positive voltage component extending from an initiation of the rising component of the single positive voltage component until a termination of the falling component of the single positive voltage component, and
• wherein the single negative voltage damping component consists of the falling component which has a continuously decreasing negative voltage from an initiation of the falling component to a most negative voltage and a rising component having a continuously increasing voltage in a positive voltage direction from the most negative voltage value, a formation time of the single negative voltage damping component being smaller than the formation time of the single positive voltage component, the single negative voltage damping component having a voltage that is less than or equal to one-half of a voltage of the positive voltage component,
• wherein the one or more vibrating units including a diaphragm, which is separate from the diaphragm of the at least one driving mechanism, and a first elastic member in combination, wherein the one or more of the vibrating units is arranged in a space at a front of the at least one driving mechanism, and a rear surface of each of the one or more of the vibrating units is connected through an acoustic path to a front surface of the at least one driving mechanism.