Abstract: According to one embodiment, a liquid discharge head includes a plate and a flow path base. The plate includes a pressure chamber which is opened to one main surface, a liquid introduction portion which converts a flow direction of a liquid to a flow toward the pressure chamber on a secondary side of the flow direction of the liquid at an opening of the pressure chamber, and a nozzle which is connected to the pressure chamber, is opened to the other main surface, and discharges the liquid. The flow path base is provided on one main surface side of the plate and forms a liquid chamber in which the liquid flows with the plate along a surface direction of the one main surface.

Abstract: According to one embodiment, a liquid ejection head includes a first base having a plurality of nozzles from which liquid can be ejected, a second base on the first base and having a plurality of pressure chambers in fluid communication with the plurality of nozzles, and a third base located on the second base, with the second base being interposed between the first and third bases, the third base having a common chamber in fluid communication with the plurality of pressure chambers, an inner wall of the common chamber has an uneven surface portion shaped so as to trap air bubbles entrained in the liquid to be ejected from the plurality of nozzles.

Abstract: An ink jet head includes a base member having a plurality of openings, a diaphragm formed on a surface of the base member covering each of the openings, a pressure chamber being formed at each of the openings, and a plurality of piezoelectric elements formed at locations on the diaphragm corresponding to the pressure chambers, each of the piezoelectric elements being configured to eject liquid from a corresponding pressure chamber by causing deformation of the diaphragm. The diaphragm includes a plurality of stress release portions that reduces compressive residual stress in the diaphragm, each of the stress release portions corresponding to one of the piezoelectric elements.

Abstract: An ink jet head includes a base member having a plurality of openings, a diaphragm formed on a surface of the base member covering each of the openings, a pressure chamber being formed at each of the openings, and a plurality of piezoelectric elements formed at locations on the diaphragm corresponding to the pressure chambers, each of the piezoelectric elements being configured to eject liquid from a corresponding pressure chamber by causing deformation of the diaphragm. The diaphragm includes a plurality of stress release portions that reduces compressive residual stress in the diaphragm, each of the stress release portions corresponding to one of the piezoelectric elements.

Abstract: An installation structure for an acoustic transducer that operates in accordance with an audio signal to vibrate a vibrated body in a first direction for permitting the vibrated body to generate sounds, including: a magnetic-path forming portion; a vibrating unit configured to vibrate in the first direction; a connecting member disposed between: a part of the vibrated body or a fixed portion fixed to the vibrated body; and the vibrating unit, for transmitting vibration of the vibrating unit to the vibrated body; a first joint portion that connects a first end portion of the connecting member to the vibrating unit for enabling the connecting member to be inclined with respect to an axis extending in the first direction; and a second joint portion that connects a second end portion of the connecting member to the fixed portion for enabling the connecting member to be inclined with respect to the axis.

Abstract: An ink jet head includes a pressure chamber formed to hold ink, and a nozzle plate including a vibrating plate forming a bottom wall of the pressure chamber, a driving element that is provided on a surface of the vibrating plate and configured to cause a volume of the pressure chamber to be changed by deforming the vibrating plate upon application of voltage to the driving element, an opening through which the ink held in the pressure chamber is discharged in response to the change of the volume of the pressure chamber, and an insulating layer disposed between the driving element and the opening.

Abstract: A wakefulness-maintaining device capable of maintaining a driver's wakefulness by making the driver aware of changes in sound characteristics.

Abstract: An installation structure for an acoustic transducer that operates in accordance with an audio signal to vibrate a vibrated body in a first direction for permitting the vibrated body to generate sounds, including: a magnetic-path forming portion; a vibrating unit configured to vibrate in the first direction; a connecting member disposed between: a part of the vibrated body or a fixed portion fixed to the vibrated body; and the vibrating unit, for transmitting vibration of the vibrating unit to the vibrated body; a first joint portion that connects a first end portion of the connecting member to the vibrating unit for enabling the connecting member to be inclined with respect to an axis extending in the first direction; and a second joint portion that connects a second end portion of the connecting member to the fixed portion for enabling the connecting member to be inclined with respect to the axis.

Abstract: An ink jet head includes a pressure chamber formed to hold ink, and a nozzle plate including a vibrating plate forming a bottom wall of the pressure chamber, a driving element that is provided on a surface of the vibrating plate and configured to cause a volume of the pressure chamber to be changed by deforming the vibrating plate upon application of voltage to the driving element, an opening through which the ink held in the pressure chamber is discharged in response to the change of the volume of the pressure chamber, and an insulating layer disposed between the driving element and the opening.

Abstract: A wakefulness-maintaining device capable of maintaining a driver's wakefulness by making the driver aware of changes in sound characteristics.