A nozzle plate (201) for use in a liquid droplet production apparatus and such apparatus, the nozzle plate comprising a flexible substrate having a linear array of nozzles that extend through said plate, said nozzles being arranged in at least one line, forming thereby a nozzle-bearing region, wherein the substrate is curved so as to impart an increased longitudinal stiffness to it. The apparatus comprises a piezo actuator (202, 203), which may have slots (211) separating fingers acting on the nozzle plate (201). The nozzle plate may be separable form the actuator.

Various techniques for driving phased array systems are described, specifically intended for acoustic phased arrays with applications to mid-air haptics, parametric audio, acoustic levitation and acoustic imaging, including a system: 1) that is capable of mitigating the effect of the changes in the air to provide a consistent haptic experience; 2) that produces trap points in air; 3) that defines phased-array optimization in terms of vectors for the production of more consistent haptic effects; 4) that defines one or more control points or regions in space via a controlled acoustic field; 5) that uses a reduced representation method for the construction of acoustic basis functions; 6) that performs efficient evaluation of complex-valued functions for a large quantity of throughput; 7) that generates a Krylov sub-space of a matrix; and 8) that maximizes an objective described by different control points and/or regions to those used to create the acoustic basis functions.

Various techniques for driving phased array systems are described, specifically intended for acoustic phased arrays with applications to mid-air haptics, parametric audio, acoustic levitation and acoustic imaging, including a system: 1) that is capable of mitigating the effect of the changes in the air to provide a consistent haptic experience; 2) that produces trap points in air; 3) that defines phased-array optimization in terms of vectors for the production of more consistent haptic effects; 4) that defines one or more control points or regions in space via a controlled acoustic field; 5) that uses a reduced representation method for the construction of acoustic basis functions; 6) that performs efficient evaluation of complex-valued functions for a large quantity of throughput; 7) that generates a Krylov sub-space of a matrix; and 8) that maximizes an objective described by different control points and/or regions to those used to create the acoustic basis functions.

A wearable display apparatus is provided. The wearable display apparatus includes: a substrate having first and second surfaces; a display component on the first surface; a surface acoustic wave transmission layer on the second surface; a surface acoustic wave input transducer configured to send out a first surface acoustic wave; a surface acoustic wave output transducer on the surface acoustic wave transmission layer, each surface acoustic wave output transducer and a corresponding surface acoustic wave input transducer being at an edge of the substrate to be adjacent to and spaced apart from each other, and each surface acoustic wave output transducer being configured to receive a second surface acoustic wave resulted from the first surface acoustic wave being transmitted and modulated by the surface acoustic wave transmission layer; and a control device, configured to control a target area of the display component to display.

A compact directional high resolution magnetostrictive phased array sensor (MPAS) includes a magnetostrictive comb-shaped patch and a magnetic circuit device. The patch was machined with 24 comb fingers along its radial direction. The magnetic circuit device contains a sensing array of angularly spaced apart sensing coils and cylindrical biasing magnets. The individual sensing coils have distinct directional sensing preferences designated by the normal direction of the coil winding. The directional sensing feature of the developed MPAS is supported by the combined effect of the magnetic shape anisotropy of the comb finger formation in the patch and the sensing directionality of the sensing array. The MPAS detects the strain-induced magnetic property change on the comb-shaped patch due to the mechanical interaction between the patch and GLWs propagating in the structure under study. The array sensor enables to acquire signal data from different sensing sections within the patch by altering the rotational orientation of the magnetic circuit device.

Provided is a sound direction detection sensor capable of detecting a direction from which sound is coming by using a multi-resonator array. The disclosed sound direction detection sensor includes two resonator arrays, each including a plurality of resonators having different resonance frequencies. The two resonator arrays have different directivities. Each resonator array serves as an audio sensor, and the sound direction detection sensor detects a direction from which sound is incident, regardless of a distance between audio sensors.

Provided is a sound direction detection sensor capable of detecting a direction from which sound is coming by using a multi-resonator array. The disclosed sound direction detection sensor includes two resonator arrays, each including a plurality of resonators having different resonance frequencies. The two resonator arrays have different directivities. Each resonator array serves as an audio sensor, and the sound direction detection sensor detects a direction from which sound is incident, regardless of a distance between audio sensors.

Provided is a resin composition for an acoustic matching layer, the resin composition including an epoxy resin (A), a specific polyamine compound (B), and metal particles (C). The epoxy resin (A) includes at least one epoxy resin selected from the group consisting of bisphenol A epoxy resins, bisphenol F epoxy resins, and phenol novolac epoxy resins. Also provided are a cured product formed of the composition, an acoustic matching sheet, an acoustic probe, an acoustic measuring apparatus, a method for producing an acoustic probe, and an acoustic matching layer material set.

Provided is a resin composition for an acoustic matching layer, the resin composition including an epoxy resin (A), a specific polyamine compound (B), and metal particles (C). The epoxy resin (A) includes at least one epoxy resin selected from the group consisting of bisphenol A epoxy resins, bisphenol F epoxy resins, and phenol novolac epoxy resins. Also provided are a cured product formed of the composition, an acoustic matching sheet, an acoustic probe, an acoustic measuring apparatus, a method for producing an acoustic probe, and an acoustic matching layer material set.

A resin composition for an acoustic matching layer; an acoustic matching sheet formed from the composition; an acoustic wave probe; an acoustic wave measuring apparatus; a method for manufacturing an acoustic wave probe; and a material set, for an acoustic matching layer, that is suitable for preparation of the composition, in which the resin composition for an acoustic matching layer includes a binder including a resin; and metal particles having a monodispersity of 40% to 80%, wherein the monodispersity is calculated by equation (1):

monodispersity (%)=(standard deviation of particle sizes of metal particles/average particle size of metal particles)100.