Foster Electric Company, Limited

A speaker device includes: a first voice coil; a second voice coil disposed radially outside the first voice coil; a first damper supporting the first voice coil to a frame; and a second damper supporting the second voice coil to the frame, and the first damper includes a recessed portion, which is separated from the second voice coil more than other portion of the first damper, on an extension line of a vibration direction of the second voice coil.

Assembling of the leaf spring and the damping member is facilitated and a vibration actuator with excellent vibration characteristic is provided. The vibration actuator mainly includes a cylindrical casing, a coil provided inside the casing, a mover vibrating along the vibration axis of the casing, a leaf spring in which an inner circumferential portion thereof is fixed to the mover, and a frame fixing the leaf spring to the casing. The frame includes a fixing portion provided in an outer circumferential portion of the leaf spring and a damping portion provided in a vibrating portion of the leaf spring.

A headset includes: a hollow housing to be worn at an ear of a user; a cylindrical ear canal insertion part that is a portion of the housing, and that is provided at a portion of the housing at a side of an ear canal; a thermistor for a headset, provided at the ear canal side inside the housing; a temperature sensor for a headset on a main substrate, provided at an opposite side from the ear canal side inside the housing; and a calculation unit that measures a body temperature of the user based on an output of the thermistor and an output of the temperature sensor.

An actuator includes an attachment member including a coil; a movable element having a magnet disposed opposite to the coil, and that is displaced relative to the attachment member when the coil is energized; a resilient support; and a cushioning material. The resilient support has an attachment member-side fixing portion that is fixed to the attachment member, a movable element-side fixing portion that is fixed to the movable element, and a deformation portion that links the attachment member-side fixing portion and the movable element-side fixing portion. The cushioning material is provided between the attachment member and the deformation portion, and deforms in conjunction with bending deformation of the deformation portion.

A vibration device causes a vehicle seat, including a seat frame that supports the seat relative to a vehicle body and a seat cushion that supports a seated occupant, to vibrate. The vibration device includes a vibrator having a vibration face attached to a seat frame, and a vibration control device that causes the vibrator to vibrate based on an input sound source signal.

Provided is an electroacoustic transducer capable of improving the reliability of a drive circuit and the sound quality. The electroacoustic transducer includes: a vibration unit constituting a part of a partition defining a cabin space of a vehicle; a magnetic circuit on an outside of the cabin space; and an electrical element configured to process an electrical signal for vibrating the vibration unit. The electrical element is located in the cabin space.

A speaker includes: an edge having an outer circumference attached on an edge mounting portion of a resin frame by a resin ring provided on a front surface of the outer circumference. Interposed between the edge mounting portion and the resin ring is a projection-like energy director having a part abutting on one of the members and being melted from the part by ultrasonic waves.

A speaker device includes: a limiting unit that limits a signal band of a sound source signal that has been input; a speaker unit that includes a diaphragm; a housing that houses the speaker unit; and a drive circuit that, based on the sound source signal with the limited signal band, outputs a control signal that causes the diaphragm of the speaker unit to vibrate, wherein: the limiting unit limits the sound source signal to a frequency band including a peak frequency of frequency characteristics of an amplitude of the speaker unit in accordance with a shape of the speaker unit and a shape of the housing.

An electrical device includes a housing, a drive unit arranged inside the housing a substrate arranged inside the housing, and a terminal electrically connecting the substrate with an external portion outside the housing. On the substrate, a circuit driving the drive unit is formed. The terminal includes a terminal protrusion exposed from an inner wall surface of the housing and protruding toward the substrate. The terminal is connected to the substrate at an end portion of the terminal protrusion. The substrate is fixed inside the housing by a first substrate attachment portion and a second substrate attachment portion arranged at a position farther from a connecting portion between the terminal and the substrate than the first substrate attachment portion. The second substrate attachment portion has higher flexibility than the first substrate attachment portion.

A vibration generating device includes: a first magnetic circuit including a pole piece, a first magnet, and a yoke that forms a magnetic gap between the pole piece; a second magnetic circuit including the pole piece, a second magnet and that repels the first magnet, and the yoke; a voice coil that is disposed in the magnetic gap and that vibrates while being affected by a magnetic field generated by the first magnetic circuit; and a reverse magnetic field separating portion that is provided at an outer peripheral edge of the pole piece, and that moves a reverse magnetic field, which is formed by the second magnetic circuit and which is opposite in direction to the magnetic field, away from the magnetic field.