Abstract: The present disclosure relates to an EEG measuring device which is in close contact with a head of a subject while having an adjustable size to fit the head of the subject.

Abstract: A hybrid actuator includes a housing for defining an external appearance, a stator having a coil, a vibrator having a permanent magnet which vibrates due to a mutual electromagnetic force with the stator, an elastic member for elastically supporting the vibrator relative to the housing, and a piezoelectric element attached to one surface of the housing.

Abstract: A hybrid actuator is provided in which a piezoelectric element and an actuator are incorporated with each other. The hybrid actuator includes: a housing; a stator secured to the housing and having a coil; a vibrator having a permanent magnet configured to vibrate due to a mutual electromagnetic force with the stator; an elastic member configured to elastically support the vibrator relative to the housing; a piezoelectric element attached to one surface of the housing; and an F-PCB (flexible printed circuit board) applying an electric current to the piezoelectric element and the coil inside the housing. A part of the F-PCB extends outside the housing. Input terminals are formed on the part of the F-PCB which extends outside the housing. The input terminals are configured to receive a vibration signal and an audio signal so that the hybrid actuator can reproduce both the vibration signal and the audio signal.

Abstract: An actuator is provided that is attached to an electronic device and configured to generate sound and vibration. The actuator includes: a first casing having sidewalls and a bottom; a second casing affixed to the first casing and forming a top; a printed circuit board attached to the first casing and configured to transmit a signal; a voice coil configured to receive the signal from the printed circuit board; and a vibrator configured to vibrate by an electromagnetic force produced through an interaction with the voice coil. The first casing forms a surface that is attached to the electronic device.

Abstract: An automatic winding device includes a lower casing having a shaft, a bobbin rotatably disposed on the shaft, a wire wound around the bobbin, a spring having a first end secured to the shaft and a second end secured to the bobbin to provide a rotational force to the bobbin, a track cover coupled to the bobbin and having tracks formed thereon, a pin positioned between the bobbin and the track cover to control rotation of the bobbin, and a pin guide spring configured to press the pin toward the track cover. The track cover includes an inner track having a radius of curvature increased and decreased along the circumferential direction, an outer track spaced apart from the inner track, a connection track configured to connect the inner and outer tracks, and a stop track configured to connect the inner and outer tracks and to stop the pin.

Abstract: A linear actuator having an elastic injection-molded frame includes a yoke, a permanent magnet attached to a bottom surface of the yoke at a distance from a side surface of the yoke, a top plate attached to a top surface of the permanent magnet, a frame coupled to an outer periphery of the yoke and injection-molded with an elastic material, a protector disposed on the frame, and a coil secured to the protector, with a lower end positioned between the permanent magnet and the side surface of the yoke. The frame includes a yoke coupling portion coupled to the yoke, a fixing portion spaced apart from the yoke coupling portion and coupled to the protector, and two or more bridges for elastically connecting the yoke coupling portion and the fixing portion.

Abstract: The present disclosure provides a reliable structure which can prevent disconnection of a voice coil lead wire, while employing a voice coil embodied as an aluminum coil to improve the mid-frequency band SPL of a slim high-pressure water resistant microspeaker. According to the present disclosure, there is provided a high-pressure water resistant microspeaker with an improved coil structure, including an FPCB attached to the outer surface of a frame, a pad of the FPCB extending inside the frame and another part of the FPCB extending outside the frame. The upper end of the voice coil is attached to an overlapping position of a side diaphragm and a center diaphragm, and the lower end of the voice coil is supported by the part of the FPCB extending inside the frame.

Abstract: A sound converter includes a rectangular frame, a first suspension seated on an upper side of the frame to vibrate, a second suspension attached to a bottom surface of the first suspension and electrically connected to a voice coil to vibrate, a magnetic circuit including a center magnet, a plurality of sub-magnets spaced apart from the center magnet by a certain distance to define a magnetic gap, a plurality of top plates positioned above the center magnet and each sub-magnet, and a bottom plate positioned below the center magnet and each sub-magnet, and a third suspension connecting a lower end or a lower end lateral surface of the voice coil to the frame to vibrate. The voice coil is attached to a bottom surface of the second suspension. The third suspension is positioned through spaces defined by the sub-magnets being spaced apart from each other.

Abstract: A wearable acoustic transducer includes a communication part for performing communication and speaker and control modules. The speaker module includes an enclosure having an inner space, a first opening in which a speaker part is mounted being formed in a first side surface thereof, a second opening in which a passive vibration part is mounted being formed in a second side surface thereof, the speaker part configured to emit sound, and a passive vibration part for relieving air stiffness in the inner space of the enclosure. The control module performs gain correction on an electric signal including sound or voice that is received from the communication part according to prestored gain correction data and applies the gain-corrected electric signal to the speaker part, or generates an electric signal corresponding to the gain correction data and applies the electric signal to the speaker part.

Abstract: A dynamic receiver for an earphone is provided. The dynamic receiver has a Helmholtz resonance space provided on a protector. The dynamic receiver includes: a frame; a magnetic circuit disposed in the frame; a vibration system disposed in the frame and configured to generate sound by a mutual electromagnetic force with the magnetic circuit; and a protector coupled to the frame and configured to protect components disposed in the frame. The protector includes a sound emitting hole passing through the protector and emitting sound generated in the frame to the outside, and a resonance space defined on a top surface of the protector.

Abstract: The present invention relates to a micro-speaker for use in a small electronic device, and more particularly, to a micro-speaker having an enclosure applied thereto and having an air adsorbent which can improve the low frequency sound quality. According to the present invention, it is possible to provide a micro-speaker which shows excellent improvement in the low frequency characteristics, regardless of a mass ratio of silicon to aluminum of an air adsorbent, and also possible to provide a micro-speaker which shows excellent improvement in the low frequency characteristics at a low cost, by reducing a mass ratio of silicon to aluminum, as compared with the conventional micro-speaker having an air adsorbent.

Abstract: The present invention discloses a microspeaker enclosure with porous materials, including a microspeaker, an enclosure with the microspeaker therein, the enclosure defining a resonance space and having an upper casing and a lower casing, a sound absorber arranged in the resonance space and defining a space, and porous materials filled in the space defined by the sound absorber.

Abstract: The present invention discloses a microspeaker enclosure with porous materials, including a microspeaker, an enclosure with the microspeaker therein, the enclosure defining a resonance space and having an upper casing and a lower casing, porous materials filled in the resonance space of the enclosure, and an anti-noise structure which prevents at least one of a collision between the porous materials, a collision between the porous materials and the enclosure, a collision between the porous materials and the microspeaker, and introduction of the porous materials into the microspeaker.

Abstract: The present invention relates to a neckband-type wireless sound transducer, and more particularly, to a neckband-type wireless sound transducer that prevents sound from being transferred to the surroundings of the wearer. The neckband-type wireless sound transducer according to the present invention, includes: a main body part configured to be seated on a human body; a main speaker part mounted on the main body part and configured to emit sound to the inside of the main body part; an auxiliary speaker part mounted on the main body part and configured to emit sound for leakage reduction to offset the sound emitted by the main speaker part and leaked to the outside of the main body part; and a controller configured to apply an electric signal for sound emission to the main speaker part and an electric signal for leakage reduction to the auxiliary speaker part.

Abstract: A hearing assistance device for informing about the state of a wearer includes: an input part configured to receive a selection input for either an ambient listening function or a music listening function; at least one microphone configured to pick up ambient sound; a speaker configured to send the ambient sound to the wearer; a communication part configured to perform wired or wireless communication with an external electronic communication device; an indication part configured to indicate that the ambient listening function or the music listening function is being performed; and a controller configured to perform the ambient listening function to pick up ambient sound from the microphone according to a selection input from the input part and send the ambient sound to the speaker, or perform the music listening function to play stored music or music received from the communication part and send the music to the speaker.

Abstract: The present invention aims to provide a microspeaker with enhanced low frequency characteristics, by arranging an adsorbent for adsorbing the air in a resonance space and defining a virtual back volume by the air adsorption of the adsorbent. According to an aspect of the present invention, there is provided a microspeaker enclosure with an air adsorbent, including a microspeaker, an enclosure with the microspeaker provided therein, the enclosure defining a resonance space, and an air adsorbent applied to the resonance space of the enclosure, wherein an air adsorption mole ratio per unit volume of the air adsorbent based on a change in the unit pressure is 40.6 mol/m3·atm.

Abstract: The present invention relates to a suspension structure for a high power micro speaker and, more particularly, to a shape of a suspension which ensures a lightweight of the suspension as well as high reliability and a conductive pattern which applies electric signals. The present invention provides a suspension for a high power micro speaker that includes an outer peripheral portion, a central portion and a connection portion, is provided with a conductive pattern, and is formed in a rectangular shape, wherein land portions for use in soldering or welding lead-in wires of a voice coil are formed on long connection portions disposed on long sides.

Abstract: A microspeaker includes a frame, magnetic circuit, voice coil configured to generate vibration by mutual electromagnetic force with the magnetic circuit, vibration plate configured to vibrate together according to the vibration of the voice coil to generate a sound, and suspension configured to guide a vibration direction of the vibration plate and voice coil. The suspension has a central portion attached to the voice coil, an annular outer circumferential portion formed to be spaced apart from the central portion by a predetermined interval, and a connection portion connecting the central and outer circumferential portions and configured to perform a damping function. The central portion has an outer end having the same height as the connection and outer circumferential portions, an inner end positioned to be higher than the outer end, and a step portion connecting the outer end and inner end. The voice coil is attached to the inner end.

Abstract: The present invention relates to a suspension structure for a high power micro speaker and, more particularly, to a shape of a suspension which ensures a lightweight of the suspension as well as high reliability and a conductive pattern which applies electric signals. The present invention provides a suspension for a high power micro speaker that includes an outer peripheral portion, a central portion and a connection portion, is provided with a conductive pattern, and is formed in a rectangular shape, wherein land portions for use in soldering or welding lead-in wires of a voice coil are formed on long connection portions disposed on long sides.

Abstract: The present invention discloses a sound transducer with a ventilation structure capable of securing a flow path of air introduced from within and outside of the sound transducer to the maximum. The sound transducer with a ventilation structure includes a frame, a magnetic circuit installed within the frame, a voice coil vibrating according to mutual electromagnetic force with the magnetic circuit upon receiving an electrical signal, a vibration plate vibrating according to vibrations of the voice coil to generate a sound, and a drain hole formed to be adjacent to the corner of the frame and allowing air to flow between the interior and exterior of the frame.