An apparatus for producing haptic feedback and an electronic device are disclosed. In an embodiment an apparatus includes a piezoelectric actuator and a mechanical structure, wherein the piezoelectric actuator is configured to modify its extension in a first direction, and wherein the mechanical structure is configured to deform as a result of a change in the extension of the piezoelectric actuator in such a way that an area of the mechanical structure is moved in relation to the piezoelectric actuator in a second direction which is perpendicular to the first direction.

An hourglass transducer including a longitudinal driver, a shell, and a pair of endcaps is provided. The driver drives the transducer. The pair of endcaps is attached to ends of the driver and cap the shell enclosing the transducer. The shell includes a first shell end, a second shell end, and a pleated geometry. The first shell end and second shell end are structured with circular cross sections. The pleated geometry is between the first shell end and the second shell end. A perimeter of the pleated geometry is the same as perimeters of the circular cross sections of the first shell end and the second shell end.

An ultrasonic sensor includes a two-dimensional array of ultrasonic transducers, a contact layer, a matching layer between the two-dimensional array and the contact layer, where the matching layer has a non-uniform thickness, and an array controller configured to control activation of ultrasonic transducers during an imaging operation for imaging a plurality of pixels within the two-dimensional array of ultrasonic transducers. During the imaging operation, the array controller is configured to activate different subsets of ultrasonic transducers associated with different regions of the two-dimensional array of ultrasonic transducers at different transmission frequencies, where the different frequencies are determined such that a thickness of the matching layer at a region is substantially equal to a quarter wavelength of the first transmission frequency for the region. The array controller is also configured to combine the plurality of pixels into a compound fingerprint image that compensates for the non-uniform thickness of the matching layer.

The ultrasonic transducer includes a case, a piezoelectric vibrator disposed in the case, a wiring member overlapped with the piezoelectric vibrator in the case and inputting signals for vibrating the piezoelectric vibrator received from the outside to the piezoelectric vibrator, and a damper portion provided in the wiring member and adjacent to the piezoelectric vibrator when viewed from the thickness direction of the piezoelectric vibrator.

The ultrasonic transducer includes a case, a piezoelectric vibrator disposed in the case, a wiring member overlapped with the piezoelectric vibrator in the case and inputting signals for vibrating the piezoelectric vibrator received from the outside to the piezoelectric vibrator, and a damper portion provided in the wiring member and adjacent to the piezoelectric vibrator when viewed from the thickness direction of the piezoelectric vibrator.

A system may include a vibrating surface, a first mechanical transducer mechanically coupled to the vibrating surface, a second mechanical transducer mechanically coupled to the vibrating surface at a location different than that of the first mechanical transducer, a first signal path for driving the first mechanical transducer, wherein the first signal path comprises a first amplifier and a first filter having a first frequency response, a second signal path for driving the second mechanical transducer, wherein the second signal path comprises a second amplifier and a second filter having a second frequency response, and a control subsystem. The control subsystem may include an analysis block configured to cross-correlate a first vibrational energy at a first location of the vibrating surface with a second vibrational energy at a second location of the vibrating surface and a coefficient control block configured to adaptively modify at least one of the first frequency response and the second frequency response responsive to cross-correlation of the first vibrational energy and the second vibrational energy in order to maximize differences between the first vibrational energy and the second vibrational energy.

The present invention relates to a miniature speaker comprising front and a rear volume, and one or more moveable diaphragms each comprising one or more cantilever beams, and associated one or more air gaps, arranged between the front and rear volumes, wherein the one or more cantilever beams are configured to bend or deflect in response to an applied drive signal, and wherein the one or more air gaps between the front and rear volumes remain essentially unaffected during bending or deflection of the one or more cantilever beams thus maintaining the acoustical leakage between the front and rear volumes at a minimum. The present invention further relates to a receiver assembly comprising such a miniature speaker, and to a hearing device, such as a receiver-in-canal hearing device, comprising such a receiver assembly.

The present invention relates to a miniature speaker comprising front and a rear volume, and one or more moveable diaphragms each comprising one or more cantilever beams, and associated one or more air gaps, arranged between the front and rear volumes, wherein the one or more cantilever beams are configured to bend or deflect in response to an applied drive signal, and wherein the one or more air gaps between the front and rear volumes remain essentially unaffected during bending or deflection of the one or more cantilever beams thus maintaining the acoustical leakage between the front and rear volumes at a minimum. The present invention further relates to a receiver assembly comprising such a miniature speaker, and to a hearing device, such as a receiver-in-canal hearing device, comprising such a receiver assembly.

A display apparatus includes a display panel configured to display an image, and a vibration device on a rear surface of the display panel to vibrate the display panel to generate a sound, the vibration device including a vibration array including a plurality of vibration modules.

An ultrasonic sensor includes a two-dimensional array of ultrasonic transducers, a contact layer, a matching layer between the two-dimensional array and the contact layer, where the matching layer has a non-uniform thickness, and an array controller configured to control activation of ultrasonic transducers during an imaging operation for imaging a plurality of pixels within the two-dimensional array of ultrasonic transducers. During the imaging operation, the array controller is configured to activate different subsets of ultrasonic transducers associated with different regions of the two-dimensional array of ultrasonic transducers at different transmission frequencies, where the different frequencies are determined such that a thickness of the matching layer at a region is substantially equal to a quarter wavelength of the first transmission frequency for the region. The array controller is also configured to combine the plurality of pixels into a compound fingerprint image that compensates for the non-uniform thickness of the matching layer.