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: 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 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: 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: An electric device includes a microspeaker module including an enclosure having a rectangular shape and serving as a sound box for generating sound pressure therein, a microspeaker installed on an upper surface of the enclosure for changing an electrical signal into sound pressure to generate vibration of air, and a subordinate vibration unit installed within the enclosure for vibrating, and a control unit for applying the electric signal to the microspeaker module to perform a vibration function and a sound emission function.

Abstract: A slim enclosure speaker is provided with a side acoustic emission structure, which can make the enclosure speaker slimmer by maximizing a sound-emitting hole in the same size, while improving SPL characteristics. The slim enclosure speaker with the side acoustic emission structure includes: a microspeaker; a lower case enclosing the lower side of the microspeaker and defining a resonance space; an upper case having a fixing surface to which top edges of the microspeaker are fixed, defining the resonance space together with the lower case, and having a hole inside the fixing surface; a cover coupled onto the upper case and covering the hole; and an acoustic passage defined by one side of the upper case and the cover, wherein the fixing surface is insert injection-molded using a steel.

Abstract: An enclosure speaker with a side acoustic emission structure is provided, which includes: a microspeaker; a lower enclosure case, on which the microspeaker is seated, the lower enclosure case further having a resonance space on the outside of the microspeaker-seated portion; an upper enclosure case coupled to a top of the lower enclosure case; an acoustic passage, a first portion of which being defined in the lower enclosure case and a remaining portion of which being defined in the upper enclosure case, the acoustic passage being made by combining the portion defined in the lower enclosure case and the portion defined in the upper enclosure case; and a mesh disposed on the acoustic passage between the lower enclosure case and the upper enclosure case.

Abstract: The present invention relates to a slim protector with a small thickness and a slim microspeaker having the same. The present invention provides a slim protector, which can reduce the thickness of a slim microspeaker by removing part of an injection product portion and exposing a steel portion to form a ledge for connecting a module case and the slim protector and allow the steel portion and the module case to engage other, and a slim microspeaker module having the same.