Em-tech Co., Ltd.

Jun Hee Han

Yong Ju Ji

Jung Ho Kang

Young Seok Noh

Young Woo Kim

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.

Earphone with duct unit dividing pressure equilibrium hole and back hole

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.

Two-way receiver having front bass duct

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.

Earphone having pressure equilibrium structure

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.

Hybrid receiver having fixing bracket for drivers

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.

Yoke assembly for two-way receiver and two-way receiver having the same

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.

Receiver module integrated with duct

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.

Growing community of inventors

Gyeongsangnam-do, South Korea

Jun Hee Han