The present disclosure provides a needle free delivery system, which includes a handheld device and a signal switching device. The signal switching device is electrically connected to the handheld device, and the handheld device includes an ultrasonic probe. The signal switching device provides a burst wave capable of generating a resonant carrier wave through piezoelectric material to the handheld device, so that an ultrasonic wave of the handheld device can perform a needleless delivery on a carrier.

The present disclosure provides a needle free delivery system, which includes a handheld device and a signal switching device. The signal switching device is electrically connected to the handheld device, and the handheld device includes an ultrasonic probe. The signal switching device provides a burst wave capable of generating a resonant carrier wave through piezoelectric material to the handheld device, so that an ultrasonic wave of the handheld device can perform a needleless delivery on a carrier.

A method of operating a PMUT electro-acoustical transducer, the method comprising: applying over an excitation interval to the transducer an excitation signal which is configured to emit corresponding ultrasound pulses towards a surrounding space, acquiring at a receiver reflected ultrasound pulses as reflected in said surrounding space, generating a reference echo signal, performing a cross-correlation of said acquired received ultrasound pulses with said reference echo signal, performing a measurement based on the cross-correlation results, in particular a measurement of the time of flight of the ultrasound pulses, wherein said reference echo is obtained by finding an oscillation frequency of the transmitter on the basis of a transmitter ringdown signal, finding an oscillation frequency of the receiver on the basis of a receiver ringdown signal, performing a frequency tuning respectively on the transmitter and the receiver on the basis of said respective oscillation frequencies, then sweeping an input frequency of the transmitter to find a frequency of the maximum displacement in the ringdown signal, performing a frequency tuning of the receiver at said frequency of the maximum displacement in the ringdown signal of the transmitter.

A method of operating a PMUT electro-acoustical transducer, the method comprising: applying over an excitation interval to the transducer an excitation signal which is configured to emit corresponding ultrasound pulses towards a surrounding space, acquiring at a receiver reflected ultrasound pulses as reflected in said surrounding space, generating a reference echo signal, performing a cross-correlation of said acquired received ultrasound pulses with said reference echo signal, performing a measurement based on the cross-correlation results, in particular a measurement of the time of flight of the ultrasound pulses, wherein said reference echo is obtained by finding an oscillation frequency of the transmitter on the basis of a transmitter ringdown signal, finding an oscillation frequency of the receiver on the basis of a receiver ringdown signal, performing a frequency tuning respectively on the transmitter and the receiver on the basis of said respective oscillation frequencies, then sweeping an input frequency of the transmitter to find a frequency of the maximum displacement in the ringdown signal, performing a frequency tuning of the receiver at said frequency of the maximum displacement in the ringdown signal of the transmitter.

An acoustic wave device includes a substrate, functional elements on a first main surface of the substrate, an outer support portion on the substrate around a region where the functional elements are disposed, a cover portion opposed to the first main surface of the substrate with the outer support portion interposed therebetween, a support portion in a hollow space defined by the substrate, the outer support portion, and the cover portion, a wiring pattern electrically connected to the functional elements, and a through electrode extending through the substrate and electrically connected to the wiring pattern. A gap is provided between the support portion and the cover portion. A distance from the first main surface of the substrate to an upper surface of the support portion is greater than a distance from the first main surface of the substrate to an upper surface of the functional elements.

The present disclosure is of a bone conduction sound transmission device. The bone conduction sound transmission device includes of a laminated structure and a base structure. The laminated structure is formed by a vibration unit and an acoustic transducer unit. The base structure is configured to load the laminated structure. At least one side of the laminated structure is physically connected to the base structure. The base structure vibrates based on an external vibration signal, and the vibration unit deforms in response to the vibration of the base structure; and the acoustic transducer unit generates an electrical signal based on the deformation of the vibration unit.

The present disclosure is of a bone conduction sound transmission device. The bone conduction sound transmission device includes of a laminated structure and a base structure. The laminated structure is formed by a vibration unit and an acoustic transducer unit. The base structure is configured to load the laminated structure. At least one side of the laminated structure is physically connected to the base structure. The base structure vibrates based on an external vibration signal, and the vibration unit deforms in response to the vibration of the base structure; and the acoustic transducer unit generates an electrical signal based on the deformation of the vibration unit.

A vibration apparatus includes a vibration device. The vibration device includes a vibration portion including a piezoelectric material, a first electrode portion at a first surface of the vibration portion and configured as a plurality of circular patterns, and a second electrode portion at a second surface different from the first surface of the vibration portion and configured as a single electrode, and the vibration device generates an ultrasound wave.

A vibration apparatus includes a vibration device. The vibration device includes a vibration portion including a piezoelectric material, a first electrode portion at a first surface of the vibration portion and configured as a plurality of circular patterns, and a second electrode portion at a second surface different from the first surface of the vibration portion and configured as a single electrode, and the vibration device generates an ultrasound wave.

A MEMS vibration sensor includes a piezoelectric membrane including a segmented electrode affixed to a holder; and an inertial mass affixed to the piezoelectric membrane, wherein the segmented electrode includes four segmentation zones, wherein, in an X-direction, a signal from a first segmentation zone is equal to a signal from a third segmentation zone, a signal from a second segmentation zone is equal to a signal from a fourth segmentation zone, and the signal from the first segmentation zone and the signal from the second segmentation zone have opposite signs, and wherein, in a Y-direction, a signal from the first segmentation zone is equal to the signal from the second segmentation zone, the signal from the third segmentation zone is equal to the signal from the fourth segmentation zone, and the signal from first segmentation zone and the signal from the third segmentation zone have opposite signs.