Abstract: A piezoelectric generator includes: a base body; and at least one piezoelectric transducer disposed on the base body, and including a first electrode, a piezoelectric body, and a second electrode, wherein the piezoelectric transducer includes a support section fixed to the base body, and a vibrating section disposed apart from the base body, having one end connected to the support section and the other end set as a free end, and vibrating due to a vibration applied externally, and a distance between the other end of the vibrating section and the base body is larger than a distance between the one end of the vibrating section and the base body.

Abstract: A fluid ejection device includes a pulsation generator which converts a fluid into a pulsed fluid, a fluid supply unit (supply pump) which supplies the fluid to the pulsation generator, an ejection tube which has an ejection opening communicating with the pulsation generator, a suction tube into which the ejection tube is inserted with play, a suction channel provided between the suction tube and the ejection tube, a suction opening provided at an end of the suction channel in a vicinity of the ejection opening, and a suction unit (suction pump) which sucks fluid in such a manner that the fluid introduced from the suction opening passes through the suction channel. The ejection opening is held by an inner circumferential part of the suction opening. According to this structure, vibration of the ejection tube in the vicinity of the ejection opening can be reduced.

Abstract: A cooling device is provided. The cooling device may include a pump chamber, an inlet flow passage that is used for allowing a fluid to flow into the pump chamber, an outlet flow passage that allows the fluid to flow out from the pump chamber, a pump that includes a fluid resistance element that opens or closes the inlet flow passage between the inlet flow passage and the pump chamber, a circulation flow passage that is used for circulating the fluid from the outlet flow passage to the inlet flow passage, and a first volume adjusting chamber that adjusts pressure of the fluid flowing into the pump chamber.

Abstract: Fluid is pressurized and supplied to a fluid chamber with a fluid pressurizing and supplying unit. The pressurized fluid within the fluid chamber is ejected through an injection nozzle by reduction of the volume of the fluid chamber caused by applying a driving voltage to a volume varying unit. In applying the driving voltage to the volume varying unit, the effect imposed on fluid injection by pressure fluctuations of the fluid pressurized and supplied to the fluid chamber is compensated by changing the voltage waveform of the driving voltage. When the pressure of the supply flow amount is decreased to a pressure lower than a predetermined pressure, the time intervals of the driving waveform are corrected. The maneuverability of a fluid injection device does not deteriorate even when the pressure of the fluid pressurized and supplied to the fluid chamber fluctuates.

Abstract: A fluid injection system includes: a first apparatus which is attached to a human body and injects a fluid into the human body; and a second apparatus which is attached to a wrist of the human body and remotely controls the first apparatus, wherein the second apparatus includes an entry section accepting an entry of an operation command to the first apparatus and a first communicating section transmitting the operation command to the first apparatus, and the first apparatus includes a second communicating section receiving the operation command, a storing section storing the fluid, and a transporting section transporting the fluid from the storing section and injecting the fluid into the human body based on the operation command.