Abstract: Proposed is an acoustic output device that obtains enough distance attenuation to achieve localization of a sound field by controlling the driving of a loudspeaker array by use of a more compact shape. The acoustic output device 10 comprises: a loudspeaker array 20 that includes a plurality of loudspeakers 20-1, 20-2, . . . , 20-N arranged in a two-dimensional plane; and an amplifier array 40 that includes a plurality of amplifiers 40-1, 40-2, . . . , 40-N that control the amplitude and phase of the drive signals for each loudspeaker according to the eigenvectors of the predetermined radiation mode of the loudspeaker array 20.

Abstract: A speaker device includes a speaker unit including a magnetic circuit and a diaphragm, connected to the magnetic circuit and being capable of generating sound waves by electrically driving the magnetic circuit to vibrate the diaphragm; and a Helmholtz resonator connected to the speaker unit. The diaphragm includes a first surface oriented to a sealed space, and a second surface that is back surface of the first surface and is oriented to the Helmholtz resonator.

Abstract: A weight with optimum weight and high strength can be easily manufactured and the vibration actuator with excellent vibration characteristic is provided. The vibration actuator is formed by a casing 2 with cylindrical shape, a coil 21 provided in the casing 2, and a mover 4 that vibrates along an vibration-axis direction of the casing 2. The mover 4 includes a mover body and a weight fixed to the mover body. A protrusion 311 protruding toward an opening of the casing 2 is provided at a central portion of the mover body, and a recess 321 which is recessed toward the opening of the casing 2 is provided at the central portion of the weight 32. The mover body and the weight 32 is fixed in a state in which the protrusion 311 is inserted into the recess 321.

Abstract: 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.

Abstract: 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.

Abstract: The disclosure provides an oscillatory actuator which includes a case in a cylindrical shape; an electromagnetic driver provided inside the case; a mover oscillated by the electromagnetic driver along an oscillation axis of the case; and a first leaf spring and a second leaf spring arranged on one side and the other side with the mover interposed therebetween, each of the first leaf spring and the second leaf spring including a support to which the mover is attached, an annular frame attached to an inner surface of the case, and a plurality of arms each having a spiral shape and connecting the support and the annular frame, wherein at least one of the first leaf spring and the second leaf spring is provided with an elastic member which is made of an elastic material that bridges the arm and a portion adjacent to the arm with a gap.

Abstract: An oscillatory actuator 1 includes: an in-case electromagnetic driver 3; a mover 4; and a pair of leaf springs 5a and 5b for supporting the mover 4. The mover 4 includes a magnet 30, pole pieces 31a and 31b paired, and masses 32a and 32b paired. The in-case electromagnetic driver 3 includes coils 21a and 21b paired and a tubular yoke 20 radially outside the coils 21a and 21b, the yoke being made of a soft magnetic material and projecting outward beyond the coils 21a and 21b along the oscillation axis O. Along the oscillation axis O, an average length Ly of the yoke O is equal to or longer than the sum of an end-to-end length Lp of the pole pieces 31a and 31b paired and the double of a one-way amplitude La of an oscillation of the mover 4, i.e., Ly>the sum (Lp+2La).

Abstract: A reference microphone for detecting noise is located under a first duct. The noise is in the form of a first plane wave in the first duct. A speaker is located on a top of the first duct. Connected to an upper part of the first duct is a second duct including an error microphone. The first plane wave in the first duct passes through an acoustic path and reaches the second duct. The error microphone detects the sound, and the speaker outputs a second plane wave with an opposite phase for canceling the first plane wave.

Abstract: A headset of the present disclosure includes a housing 1 worn on user's ears, an ear-canal insertion portion 10 with a cylindrical shape provided at an ear-canal side of the housing 1 as a part of the housing 1, a driver 4 for outputting a signal provided inside the housing 1, and a microphone 5 provided at the back of a signal outputting surface of the housing 1 to acquire a response signal from a front of the driver 4.

Abstract: An aspect of the present invention is directed to a diaphragm for an electroacoustic transducer, and according to the diaphragm for an electroacoustic transducer, in a base material made of a fiber material mainly composed of cellulose fibers, a mixed layer in which the fiber material and silk nanofibers are mixed is formed.

Abstract: A diaphragm for an electroacoustic transducer includes a paper substrate containing cellulose fibers as a main component and is configured such that a first surface region with a predetermined thickness from a first surface of the paper substrate has a greater total amount of coloring particles than a second surface region with a predetermined thickness from a second surface of the paper substrate, the second surface being opposite to the first surface.

Abstract: A damper has an inner circumference including a curve descending in a bow shape. A wave section extends from the outer circumferential end of the curve to the outer circumference of the damper. The inner circumference of the damper is shorter than the wave section.

Abstract: The disclosure provides an oscillatory actuator which includes a case in a cylindrical shape; an electromagnetic driver provided inside the case; a mover oscillated by the electromagnetic driver along an oscillation axis of the case; and a first leaf spring and a second leaf spring arranged on one side and the other side with the mover interposed therebetween, each of the first leaf spring and the second leaf spring including a support to which the mover is attached, an annular frame attached to an inner surface of the case, and a plurality of arms each having a spiral shape and connecting the support and the annular frame, wherein at least one of the first leaf spring and the second leaf spring is provided with an elastic member which is made of an elastic material that bridges the arm and a portion adjacent to the arm with a gap.

Abstract: Speakers for vehicles which can output sound with identical characteristic regardless of shape and dimension of entire components of interiors and exteriors of the speakers and which can be manufactured by small number of components and processes are provided. A speaker for vehicles of the present disclosure includes a vibration component having a plate shape. A vibration surface is formed on a part of the vibration component. A non-vibration surface is formed on a part of the vibration component. A dividing portion divides the vibration surface and the non-vibration surface. A voice coil is fixed on the vibration surface. A holding component is fixed on the non-vibration surface. A magnetic circuit is fixed on the holding component and corresponds to the voice coil.

Abstract: An oscillatory actuator includes a first damper 51 and a second damper 251 attached to a case 1 and including spiral arms, and first elastic member 150 and second elastic member 350 bridging adjacent arms of the first damper 51 and the second damper 251.

Abstract: A reference microphone for detecting noise is located under a first duct. The noise is in the form of a first plane wave in the first duct. A speaker is located on a top of the first duct. Connected to an upper part of the first duct is a second duct including an error microphone. The first plane wave in the first duct passes through an acoustic path and reaches the second duct. The error microphone detects the sound, and the speaker outputs a second plane wave with an opposite phase for canceling the first plane wave.

Abstract: A diaphragm has a configuration including a diaphragm main body, a cone part on an outer periphery of the diaphragm main body, a ring member joined to the cone part, and an edge having an inner periphery joined to an outer periphery of the ring member or an outer periphery of the cone part. This configuration improves the rigidity without changing the shape of the diaphragm main body, that is, without giving rise to a mass increase in the diaphragm main body, and keeps the sound pressure from decreasing in a high frequency range.

Abstract: An on-vehicle woofer system includes: a speaker unit including a magnetic circuit and a diaphragm connected to the magnetic circuit, and capable of generating sound waves by electrically driving the magnetic circuit to vibrate the diaphragm; a Helmholtz resonator to which a first surface of the diaphragm is oriented, the Helmholtz resonator being connected to the speaker unit; a sealed container to which a second surface of the diaphragm that is a back surface of the first surface is oriented, the sealed container providing a sealed space connected to the speaker unit; and a tube penetrating the Helmholtz resonator, the speaker unit, and the sealed container.

Abstract: A speaker device 1 includes: a speaker unit 20 including a magnetic circuit 22 and a diaphragm 21 connected to the magnetic circuit 22, and being capable of generating sound waves by electrically driving the magnetic circuit to vibrate the diaphragm 21; and a Helmholtz resonator 11 connected to the speaker unit 20. The diaphragm 21 includes a first surface oriented to a sealed space, and a second surface that is a back surface of the first surface and is oriented to the Helmholtz resonator 11.

Abstract: A vibration actuator that can prevent reduction of vibration performance and durability of the vibration actuator and that can prevent occurrence of operation failure and noise when the vibration actuator had impact from the outside is provided. The vibration actuator includes a cylindrical casing having a first coil and a second coil, a movable element arranged inside the casing and having a magnet, and a first inner guide and a second inner guide arranged between the first coil and the second coil, and the movable element 4 and having extending portions and which sandwich and hold a part of the first coil and the second coil together with the casing.