Abstract: A two-way receiver includes a cylindrical frame, a yoke dividing an internal space of the frame and including a cylindrical portion, a first flange portion formed at an outer periphery of the cylindrical portion, a connection wall bent downward from the first flange portion, a second flange portion formed at an outer periphery of the connection wall, and a communication hole formed by deleting a portion of the connection wall and second flange portion. A first speaker unit is installed above the yoke, and a second speaker unit below the yoke. A protector coupled to a lower portion of the frame protects the second speaker. A bass duct formed on an outer periphery of the first speaker unit has a sound emission hole for emitting a sound of the first speaker unit emitted to the communication hole of the yoke to a position spaced apart from the communication hole.

Abstract: Provided is an earphone having a pressure equilibrium structure capable of preventing a decrease in acoustic characteristics or sound pressure, while having a structure capable of achieving equilibrium within an ear canal. The earphone includes a receiver including a frame, a magnetic circuit, a voice coil, and a diaphragm, a front housing surrounding a front and a side surface of the receiver and including a sound tube, a rear housing attached to a rear of the receiver and coupled to the front housing, and a duct located between the diaphragm and the sound tube. An acoustic path through which sound is emitted is formed from the receiver to an end of the sound tube. The front housing or the rear housing includes a leakage hole. An inner end of the duct is connected to the acoustic path. An outer end of the duct is connected to the leakage hole.

Abstract: A hybrid receiver includes a dynamic driver including a frame, magnetic circuit, voice coil vibrated by the magnetic circuit and a mutual electromagnetic force, and a diaphragm to which the voice coil is attached to vibrate, a balanced armature driver including a housing, a magnetic circuit, a coil, an armature magnetized by a magnetic field of the coil to interact with the magnetic circuit, a rod vertically connected to the armature, and a diaphragm vibrated by the rod, and a bracket coupled to an upper portion of the diaphragm of the dynamic driver and having a sound emission port configured to emit sound of the dynamic driver. The bracket has a balanced armature driver accommodation space on an upper surface thereof. The balanced armature driver is disposed such that the diaphragm is parallel to the upper surface of the bracket. The housing has a sound emission hole above the diaphragm.

Abstract: The present disclosure provides an earphone with a duct unit dividing a pressure equilibrium hole and a back hole. The earphone includes a driver unit including a frame, a magnetic circuit, a voice coil, a diaphragm configured to reproduce sound, and a pressure equilibrium hole configured to improve a pressure difference between front and rear sides of the driver unit, and a back hole configured to smooth vibration of the diaphragm. A housing allows the driver unit to be installed therein and includes a vent hole. A duct unit provided in the housing adjusts a size of a back volume in the housing and provides a flow path from the pressure equilibrium hole to the vent hole.

Abstract: Disclosed are a yoke assembly having a magnetic field aggregation structure and a two-way receiver having the same. The yoke assembly for a two-way receiver provided in a two-way receiver having two speaker units sharing a portion of a magnetic field, includes a yoke including a cylindrical portion having a circular bottom surface and a side wall and a flange portion extending externally from an upper end of the side wall of the cylindrical portion and a first magnetically permeable plate attached to an upper surface of the flange portion.

Abstract: A receiver having a pressure equilibrium structure includes a magnetic circuit including a yoke, a permanent magnet coupled to the yoke, and a top plate attached to the permanent magnet, a voice coil configured to vibrate by mutual electromagnetic force with the magnetic circuit, a diaphragm allowing the voice coil to be attached thereto and vibrated by the voice coil to generate sound, and a protector coupled to an upper surface of the diaphragm and surrounding an outer side of the magnetic circuit with a gap from an outer periphery of the magnetic circuit, wherein the protector has a hole communicating with a gap portion with the magnetic circuit and an air path is formed by the hole of the protector and the gap between the magnetic circuit and the protector.

Abstract: A two-way receiver includes a cylindrical frame, a yoke dividing an internal space of the frame and including a cylindrical portion, a first flange portion formed at an outer periphery of the cylindrical portion, a connection wall bent downward from the first flange portion, a second flange portion formed at an outer periphery of the connection wall, and a communication hole formed by deleting a portion of the connection wall and second flange portion. A first speaker unit is installed above the yoke, and a second speaker unit below the yoke. A protector coupled to a lower portion of the frame protects the second speaker. A bass duct formed on an outer periphery of the first speaker unit has a sound emission hole for emitting a sound of the first speaker unit emitted to the communication hole of the yoke to a position spaced apart from the communication hole.

Abstract: Disclosed is a receiver module integrated with a duct. The present disclosure provides a receiver module integrated with a duct in which a back volume and a duct are provided at an outer circumference of a frame of a receiver.

Abstract: Disclosed is a receiver module including: a casing including an upper casing having a sound insulation hole and a lower casing coupled to the upper casing and having a ventilation hole; a receiver installed in an internal space defined by the casing and having a frame, a magnetic circuit, a voice coil, and a diaphragm; and an air module disposed to surround a lower surface and an outer circumference of the receiver, fixed to an inner circumference of the casing, and having an air path connecting the sound insulation hole and the ventilation hole.

Abstract: A hybrid receiver includes a dynamic driver including a frame, magnetic circuit, voice coil vibrated by the magnetic circuit and a mutual electromagnetic force, and a diaphragm to which the voice coil is attached to vibrate, a balanced armature driver including a housing, a magnetic circuit, a coil, an armature magnetized by a magnetic field of the coil to interact with the magnetic circuit, a rod vertically connected to the armature, and a diaphragm vibrated by the rod, and a bracket coupled to an upper portion of the diaphragm of the dynamic driver and having a sound emission port configured to emit sound of the dynamic driver. The bracket has a balanced armature driver accommodation space on an upper surface thereof. The balanced armature driver is disposed such that the diaphragm is parallel to the upper surface of the bracket. The housing has a sound emission hole above the diaphragm.

Abstract: A receiver having a pressure equilibrium structure includes a magnetic circuit including a yoke, a permanent magnet coupled to the yoke, and a top plate attached to the permanent magnet, a voice coil configured to vibrate by mutual electromagnetic force with the magnetic circuit, a diaphragm allowing the voice coil to be attached thereto and vibrated by the voice coil to generate sound, and a protector coupled to an upper surface of the diaphragm and surrounding an outer side of the magnetic circuit with a gap from an outer periphery of the magnetic circuit, wherein the protector has a hole communicating with a gap portion with the magnetic circuit and an air path is formed by the hole of the protector and the gap between the magnetic circuit and the protector.

Abstract: Provided is an earphone having a pressure equilibrium structure capable of preventing a decrease in acoustic characteristics or sound pressure, while having a structure capable of achieving equilibrium within an ear canal. The earphone includes a receiver including a frame, a magnetic circuit, a voice coil, and a diaphragm, a front housing surrounding a front and a side surface of the receiver and including a sound tube, a rear housing attached to a rear of the receiver and coupled to the front housing, and a duct located between the diaphragm and the sound tube. An acoustic path through which sound is emitted is formed from the receiver to an end of the sound tube. The front housing or the rear housing includes a leakage hole. An inner end of the duct is connected to the acoustic path. An outer end of the duct is connected to the leakage hole.

Abstract: Disclosed is a bonding structure of a diaphragm for a receiver and a method thereof. The diaphragm of the receiver includes a center diaphragm and a side diaphragm elastically supporting the center diaphragm, formed by heat and pneumatic pressure, and bonded to the center diaphragm. At least one of the center diaphragm and the side diaphragm is formed of a thermoplastic elastomer film.

Abstract: Disclosed are a yoke assembly having a magnetic field aggregation structure and a two-way receiver having the same. The yoke assembly for a two-way receiver provided in a two-way receiver having two speaker units sharing a portion of a magnetic field, includes a yoke including a cylindrical portion having a circular bottom surface and a side wall and a flange portion extending externally from an upper end of the side wall of the cylindrical portion and a first magnetically permeable plate attached to an upper surface of the flange portion.

Abstract: Disclosed is a receiver module integrated with a duct. The present disclosure provides a receiver module integrated with a duct in which a back volume and a duct are provided at an outer circumference of a frame of a receiver.

Abstract: Disclosed is a bonding structure of a diaphragm for a receiver and a method thereof. The diaphragm of the receiver includes a center diaphragm and a side diaphragm elastically supporting the center diaphragm, formed by heat and pneumatic pressure, and bonded to the center diaphragm. At least one of the center diaphragm and the side diaphragm is formed of a thermoplastic elastomer film.

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: An automatic winding device includes a lower casing having a shaft, a bobbin rotatably disposed on the shaft with a wire wound around the bobbin, a spring to provide a rotational force to the bobbin, a track cover coupled to the bobbin to rotate with the bobbin and having a track formed thereon, a pin structure positioned between the bobbin and track cover and having a pin for controlling bobbin rotation, and a pin guide for guiding linear motion of the pin structure. The track cover includes an inner track, an outer track spaced apart from the inner track, a connection track for connecting the inner and outer tracks, and a stop track for connecting the inner and outer tracks. The stop track has a bent portion for stopping the pin. An end of the connection track near the outer track is connected to the outer track and stop track.

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.