An displacement amplifying mechanism that enlarges an amount of displacement of an actuator includes an accommodation chamber in which a liquid is sealed, a first wall portion that forms a wall surface of the accommodation chamber and applies a pressure to the liquid in accordance with displacement of the actuator, and a second wall portion that forms the wall surface of the accommodation chamber and is displaced in a first direction which is a direction away from the accommodation chamber in a state where an elastic force acting in a second direction approaching the accommodation chamber is generated by a pressure of the liquid when the first wall portion applies the pressure to the liquid, in which an area of the second wall portion in contact with the liquid is smaller than an area of the first wall portion in contact with the liquid.

An active cooling system and method for using the active cooling system are described. The active cooling system includes a cooling element having a first side and a second side. The first side of the cooling element is distal to a heat-generating structure and in communication with a fluid. The second side of the cooling element is proximal to the heat-generating structure. The cooling element is configured to direct the fluid using a vibrational motion from the first side of the cooling element to the second side such that the fluid moves in a direction that is incident on a surface of the heat-generating structure at a substantially perpendicular angle and then is deflected to move along the surface of the heat-generating structure to extract heat from the heat-generating structure.

An electronic cigarette liquid supply device includes the piezoelectric substrate, the insulating film, the first interdigital transducer, the second interdigital transducer, the liquid storage chamber, the flow channel and the liquid outlet. A liquid inlet is provided on the liquid storage chamber. One end of the flow channel is hermetically connected to the liquid storage chamber, and the other end of the flow channel is the liquid outlet. The first interdigital transducer and the second interdigital transducer are attached to a surface of the piezoelectric substrate and located between the piezoelectric substrate and the insulating film. The liquid storage chamber, the flow channel and the liquid outlet are provided outside and above the insulating film.

According to an example, a microfluidic device may include a transport channel having an inlet and an outlet and a plurality of pump loops extending along the transport channel. Each of the plurality of pump loops may include a first branch, a second branch, and a connecting section connecting the first branch and the second branch. The first branch may include a first opening and the second branch may include a second opening, in which the first opening and the second opening are in direct fluid communication with the transport channel. The pump loops may also each include an actuator positioned in the first branch, in which the actuators in the pump loops are to be activated to induce a traveling wave that is to transport the fluid through the transport channel from the inlet to the outlet.

A fluid control device includes a piezoelectric pump, a piezoelectric pump, a valve, and a container. The piezoelectric pump and the piezoelectric pump repeat the operation and the stop in accordance with a drive control cycle. The valve starts a control to close at the start timing of one cycle of the drive control cycle and starts a control to open at the stop of the piezoelectric pump and the piezoelectric pump. The time from the start timing of one cycle of the drive control cycle to the time at which the piezoelectric pump on the upstream side pump reaches a normal operation drive voltage is longer than the time from the start timing to the time at which the piezoelectric pump on the downstream side reaches a normal operation drive voltage.

A pump device includes a first piezoelectric pump, a second piezoelectric pump connected in series to the first piezoelectric pump on an upstream side of the first piezoelectric pump, a driver unit that supplies alternating-current input power to the first piezoelectric pump and the second piezoelectric pump, and a distribution setting unit that sets a distribution ratio of the input power to be supplied from the driver unit to each of the first piezoelectric pump and the second piezoelectric pump, wherein the distribution setting unit sets a ratio of the input power for the second piezoelectric pump to the input power for the first piezoelectric pump to a value greater than 1 and equal to or less than 1.57.

A system for cooling a mobile phone and method for using the system are described. The system includes an active piezoelectric cooling system, a controller and an interface. The active piezoelectric cooling system is configured to be disposed in a rear portion of the mobile phone distal from a front screen of the mobile phone. The controller is configured to activate the active piezoelectric cooling system in response to heat generated by heat-generating structures of the mobile phone. The interface is configured to receive power from a mobile phone power source when the active piezoelectric cooling system is activated.

This invention discloses a blood pressure measurement device including a cuff having a bladder wrap around an object to be measured, a MEMS pump for inflating the bladder with air, a pressure sensor for monitoring the pressure in the bladder, and a microcontroller for controlling the pressure sensor to continuously receive pressure signals during the process of inflating the bladder, converting the pressure signals into blood pressure values, and controlling a drive voltage level of the MEMS pump to maintain an air inflation speed of the MEMS pump in a predetermined inflation speed range. The invention further discloses a method for controlling a fixed frequency change of the blood pressure measurement device.

A fluid control apparatus includes a valve and a pump. The valve has a valve chamber surrounded by the first main plate, the second main plate, and the side plate. The first main plate has a first aperture, and the second main plate has a second aperture. The valve further includes a valve diaphragm disposed inside the valve chamber. The valve diaphragm is configured to switch between a state in which the first aperture and the second aperture communicate with each other and a state in which the first aperture and the second aperture do not communicate with each other. The pump includes a vibration unit that has a piezoelectric device and a vibrating plate. The pump has a pump chamber that is defined by the vibration unit and the second main plate. The pump chamber communicates with the valve chamber through the second aperture.

A fluid control device includes a housing. The housing includes a first main plate, a second main plate, and a side plate connecting the first main plate and the second main plate. The housing has a pump chamber defined by the first main plate, the second main plate, and the side plate. The fluid control device also includes a driver, a first hole that extends through the first main plate or the second main plate, and a first recess formed in the first main plate between a center and a circumference or the second main plate between a center and a circumference.