An audio apparatus includes a housing, a piezoelectric vibration unit provided to the housing and having a piezoelectric element, and a communication unit for receiving an audio signal. When a received audio signal is applied to the piezoelectric element while a load of the audio apparatus is applied to the piezoelectric vibration unit, the piezoelectric element is deformed causing deformation of the piezoelectric vibration unit, whereby a contact surface in contact with the audio apparatus vibrates and generate a sound.

An ultrasound probe is provided which maintains sufficient adhesion strength of the layers that configure the ultrasound probe and which matches the acoustic impedance of a piezoelectric element to that of the organism; also provided is an ultrasound diagnostic device provided with said ultrasound probe. This ultrasound probe (100a) is characterized by comprising a backing layer, a piezoelectric element layer (6E), an acoustic matching layer (2A) and an acoustic lens (1), laminated in that order, wherein an adhesion layer (14A) containing vanadium glass is provided between the piezoelectric element layer (6E) and the acoustic matching layer (2A).

An ultrasound probe is provided which maintains sufficient adhesion strength of the layers that configure the ultrasound probe and which matches the acoustic impedance of a piezoelectric element to that of the organism; also provided is an ultrasound diagnostic device provided with said ultrasound probe. This ultrasound probe (100a) is characterized by comprising a backing layer, a piezoelectric element layer (6E), an acoustic matching layer (2A) and an acoustic lens (1), laminated in that order, wherein an adhesion layer (14A) containing vanadium glass is provided between the piezoelectric element layer (6E) and the acoustic matching layer (2A).

An omnidirectional electroacoustic transducer capable of reproducing a sound with high acoustic quality and sufficient sound volume in a wide frequency band is provided with a small number of components. The electroacoustic transducer includes: two or more electroacoustic transduction units each including an electroacoustic transduction film and an elastic supporter, the electroacoustic transduction film having a polymer composite piezoelectric body in which piezoelectric body particles are dispersed in a viscoelastic matrix formed of a polymer material having viscoelasticity at a normal temperature, and two thin film electrodes laminated on both surfaces of the polymer composite piezoelectric body, and the elastic supporter being disposed to be closely attached to one principal surface of the electroacoustic transduction film so as to cause the electroacoustic transduction film to be bent, in which the two or more electroacoustic transduction units are disposed so that the electroacoustic transduction films face outward and form some or all of faces of a polyhedron.

A sound inspection method of a display device and a sound inspection device including preparing a display device including a display panel and a sound generator disposed on a first surface of the display panel, placing a vibration sensor on a second surface opposite to the first surface of the display panel, vibrating the sound generator at a first reference frequency, vibrating the display panel, and then sensing a vibration of the vibration sensor that vibrates along with a vibration of the display panel; and determining whether a frequency of the vibration of the vibration sensor is included in a first threshold frequency region.

A display apparatus includes a display panel configured to display an image, a circuit part including a printed circuit board disposed spaced apart from a first portion of the display panel and connected to the display panel, a first vibration device disposed at a rear surface of the display panel, and a second vibration device disposed at a rear surface of the printed circuit board.

A display apparatus includes a display panel configured to display an image, a circuit part including a printed circuit board disposed spaced apart from a first portion of the display panel and connected to the display panel, a first vibration device disposed at a rear surface of the display panel, and a second vibration device disposed at a rear surface of the printed circuit board.

A method of transducing electrical energy to sound is disclosed which includes providing a transducer, the transducer includes lead zirconate titanate (PZT) particles mixed with graphene nanoplatelets (GNPs) in a flexible substrate aligned in a first direction, forming a transducer subsystem, a first conductive protective electrode having a width and a length configured to provide a first electrical connectivity to an external circuit, and a second conductive protective electrode having the width and the length and configured to provide a second electrical connectivity to the external circuit, wherein the transducer subsystem is sandwiched between the first and second conductive protective electrodes, and providing an external circuit configured to provide an electrical signal to the first and second conductive protective electrodes to thereby transduce the electrical signal to sound.

A display apparatus may include a display panel including a display area configured to display an image, and a non-display area, an optical module on a rear surface of the display panel, at least one first sound generator on a rear surface of the optical module, and at least one second sound generator in the non-display area and between the display panel and the optical module.

A display apparatus may include a display panel including a display area configured to display an image, and a non-display area, an optical module on a rear surface of the display panel, at least one first sound generator on a rear surface of the optical module, and at least one second sound generator in the non-display area and between the display panel and the optical module.