WO2017116023A1

WO2017116023A1 - Noise shielding earset having acoustic filter

Info

Publication number: WO2017116023A1
Application number: PCT/KR2016/013990
Authority: WO
Inventors: 김은동
Original assignee: 주식회사 오르페오사운드웍스
Priority date: 2015-12-30
Filing date: 2016-11-30
Publication date: 2017-07-06

Abstract

Disclosed is a noise shielding earset having an acoustic filter. The noise shielding earset having an acoustic filter according to the present invention comprises: a driver unit for generating sound; and an acoustic filter for covering a back hole formed through the driver unit, in order to shield an external noise while allowing air to pass through the acoustic filter, wherein: the acoustic filter comprises a filter layer having a through-hole and a sound movement path selectively formed therethrough, and a plate having a through-hole formed therethrough which selectively communicates with the through-hole and the sound movement path of the filter layer; the filter layer and the plate are repeatedly laminated on each other; and the through-hole of the plate communicates with the through-hole of the filter layer or the sound movement path thereof.

Description

Noise Shield Earset with Acoustic Filter

The present invention relates to noise shielding technology. More specifically, the present invention relates to a noise shield earset having an acoustic filter that completely shields external noise while maintaining the same air pressure inside and outside the earset.

Earsets are typically in-ear earphones, and are sound equipment that listens to sound while being inserted into the auricle and the ear canal.

On the other hand, as the earset is inserted into the ear canal, a pressure difference occurs between the inside of the earset (human pressure) and the outside (atmospheric pressure). That is, as the ear tip formed on the ear set is in close contact with the inner ear canal wall, the pressure difference between the inside and the outside of the ear set is generated.

However, this pressure difference affects the diaphragm, and the diaphragm is biased outward of the ear set.

To prevent bias of the diaphragm, a back hole exists at the rear of the dynamic driver unit and the balanced armature driver unit. This backhaul serves to keep the air pressure inside and outside the earset the same. In this way, the diaphragm may be vibrated at the correct position. In addition, when the backhaul is covered by dampers having different mesh densities, different pressure differentials are generated during the operation of the diaphragm, which may be used for tuning.

However, this backhaul has a problem that acts as a path for the external noise input. Where it is necessary to completely shield the outside noise, for example, to use in an airport, etc., the external noise must be completely shielded, but due to the presence of a backhaul formed in the rear of the driver unit, there is a problem that it is difficult to completely shield the outside noise.

On the other hand, the earset integrating the speaker and the microphone, the body to perform the function of transmitting sound to the ear canal and to collect the user voice in one body (Body). Typically, the speaker is directed toward the ear canal for sound transmission, and the microphone is exposed to the outside of the auricle to collect the user's voice. However, even in the case of such an earset, there is a problem in that external noise is input through a sound collecting hole formed for sound collecting of the microphone, and the external noise is introduced through a back hole formed at the rear of the driver unit. On the other hand, in the case of the in-ear microphone in which the microphone faces the ear canal (In-ear microphone) there is a problem that the sound quality is deteriorated due to external noise regardless of the installation position of the in-ear microphone. If the backhaul formed at the rear of the driver unit is closed, the above-mentioned diaphragm skew occurs, so that it cannot be used in an aircraft or a high mountain region.

Accordingly, there is a need for a method of shielding external noise from being introduced through the backhaul formed at the rear of the dynamic driver unit and the balanced armature driver unit, and allowing air to be introduced.

An object of the present invention is to provide a noise shielding earset having an acoustic filter to cover the back hole formed in the driver unit with an acoustic filter to maintain the same air pressure inside and outside the earset and to completely shield external noise.

Noise shielding earset having an acoustic filter of the present invention for achieving the above object, preferably a driver unit for generating sound; And an acoustic filter covering the backhaul formed in the driver unit to allow air to flow and shield external noise.

The acoustic filter may include a filter layer in which a through hole and a sound movement path are selectively formed; And a plate having a through hole selectively communicating with the through hole and the sound movement path, wherein the filter layer and the plate are repeatedly stacked with each other, and the through hole of the plate and the through hole or sound movement path of the filter layer communicate with each other. At this time, the through hole formed in the plate adjacent to the filter layer is preferably communicated at different ends of the sound movement path of the filter layer, and the sound movement path of the neighboring filter layer is thinner and longer (high sound component does not pass and bass To pass only the ingredients).

Meanwhile, a sound absorbing material may be filled in the sound movement path, and the sound absorbing material may use any one or more of polyester, glass fiber, mineral wool, glass wool, and polyurethane.

According to the present invention, the high and mid ranges are removed through the acoustic filter, and only the low range is substantially passed below 100 Hz. In the Bluetooth standard, the low pass is filtered, and thus the air passes through, but the external noise is perfect. Can be shielded.

On the other hand, even when the sound is reverse output through the backhaul by the operation of the driver unit, only the low range of less than 100Hz through the acoustic filter is output, it is possible to prevent the influence of the sound generated inside the earset. That is, even if the corresponding low range is input to the microphone (in-ear microphone), the filtering is performed to remove the high range and the low range to reduce the amount of data when transmitting from Bluetooth, etc., thereby preventing the influence of noise generated inside the earset.

1 is a cross-sectional view of a noise shield earset having an acoustic filter according to an embodiment of the present invention.

2 is an exploded perspective view of an acoustic filter according to an embodiment of the present invention.

3 is an enlarged view of an acoustic filter according to an exemplary embodiment of the present invention.

4 is a cross-sectional view of the dynamic driver unit applied to the present invention.

5 is a cross-sectional view of an earset having a dynamic driver unit and an in-ear microphone as another application example of the present invention.

6 is a cross-sectional view of a noise shield earset having an acoustic filter according to another embodiment of the present invention.

7 is a cross-sectional view of the balanced armature driver unit applied in the present invention.

Hereinafter, with reference to the preferred embodiments of the present invention and the accompanying drawings will be described in detail, the same reference numerals in the drawings will be described on the assumption that the same components.

When any one element in the description or claims of the invention "includes" another element, unless otherwise stated, it is not limited to consisting only of that element, and other elements are not interpreted. It should be understood that it may include more.

Further, in the detailed description of the invention or in the claims, the elements designated as "~ means", "~ part", "~ module", and "~ block" mean a unit that processes at least one function or operation, Each of these may be implemented by software or hardware, or a combination thereof.

Hereinafter, an example in which the noise shielding earset having the acoustic filter of the present invention is implemented will be described with reference to a specific embodiment.

Referring to FIG. 1, in the present embodiment, an earset to which a dynamic driver unit is applied, the noise shielding earset of the present invention covers the dynamic driver unit 1 and the backhaul formed at the rear of the dynamic driver unit 1. An acoustic filter 2.

The noise shielding earset of the present invention configured as described above uses the acoustic filter 2 covering the backhaul to maintain the same air pressure inside and outside the earset, and to shield external noise introduced through the backhaul.

In addition, even when sound is reversely output through the backhaul by the operation of the dynamic driver unit 1, only the low range of 100 Hz or less is output via the acoustic filter 2.

Referring to FIG. 2, the acoustic filter 2 of the present invention selectively communicates with the

filter layers

2b, 2d and 2f on which the through and sound movement paths l are selectively formed, and the through and sound movement paths l. It includes a plate (2a, 2c, 2e) is formed through the through hole (h).

The outermost cover 2g is formed.

The

filter layers

2b, 2d and 2f and the

plates

2a, 2c and 2e may be repeatedly stacked on each other, and the holes h of the

plates

2a, 2c and 2e and the holes of the

filter layers

2b, 2d and 2f may be stacked. Alternatively, only the state in which the sound movement path 1 communicates may be maintained. In other words, the through hole or the sound movement path 1 of the

filter layers

2b, 2d and 2f communicates with the through hole h of the

adjacent plates

2a, 2c and 2e. Meanwhile, the through holes h formed in the

plates

2a, 2c, and 2e adjacent to any one of the

filter layers

2b, 2d, and 2f are different from each other in the sound movement path l of the

filter layers

2b, 2d, and 2f. It is preferred to communicate at the end. Of course, any of the sound movement paths 1 of the

filter layers

2b, 2d, and 2f may communicate with the through-holes h formed in the

plates

2a, 2c, and 2e, and the number of communicating may be many.

The sound movement path 1 formed in the

filter layers

2b, 2d, and 2f may have various shapes such as a vortex shape and a zigzag shape. Preferably, the sound movement paths 1 formed in the neighboring

filter layers

2b, 2d, and 2f are orthogonal to each other.

A plurality of different sound movement paths 1 may be formed in the

filter layers

2b, 2d, and 2f, and a plurality of holes are provided in the neighboring

plates

2a, 2c, and 2e corresponding to the plurality of sound movement paths 1. This can be formed.

In the present embodiment, a case is described in which three

filter layers

2b, 2d and 2f, three

plates

2a, 2c and 2e and one cover 2g are described. The combination of 2f) and

plates

2a, 2c, and 2e can be any combination.

In the present embodiment, the sound movement path 1 is formed in the

filter layers

2b, 2d, and 2f, but the sound movement path 1 is formed in the

plates

2a, 2c, and 2e. Perforations may be formed in the filter layer.

The acoustic filter 2 configured as described above is attached to the backhaul of the dynamic driver unit 1 to filter sound input and output through the backhaul.

Referring to FIG. 3, in the present invention, the filter layer 2d forms the sound movement path 1, and the

plates

2c and 2e form the through hole h.

The ends of the sound movement path l of the filter layer 2d coincide with the positions P1 and P2 of the through hole h of the

plates

2c and 2e, so that the sound movement path l and the through hole h communicate with each other. do.

The size (width) of the sound movement path 1 may be different for each filter layer, and may be determined corresponding to the shape of the sound movement path 1.

The size of the through hole h of the

plates

2c and 2e may also be different.

Polyester, glass fiber, mineral wool, glass wool, polyurethane, etc. may be used as the material of the filter layer 2d, and the filter layer 2d may perform functions such as sound absorption, ringing prevention, and vibration prevention.

The

plates

2c and 2e are preferably thin thin plates made of metal or synthetic resin, and the

plates

2c and 2e mainly perform a sealing function of the sound movement path 1.

Meanwhile, the sound movement path 1 may be filled with a sound absorbing material, and the sound absorbing material may use the material of the filter layer 2d.

The acoustic filter 2 configured as described above is mostly absorbed while passing through the horizontal, vertical, and various sound movement paths 1. That is, high and mid ranges are absorbed and only low frequencies below 100 Hz are passed. In addition, the state in which the backhaul and the air is maintained to maintain the same air pressure inside and outside the ear set. As a result, air passes through the acoustic filter 2, but most of the external noise is shielded.

Referring to FIG. 4, the dynamic driver unit 1 presented as an example in the present invention includes a hollow cone-shaped frame (yoke) 1a and a hollow cone-shaped diaphragm 1b vibrating inside the frame 1a. And an edge surround 1c for elastically supporting the front end of the diaphragm 1b to the front end of the frame 1a, and the front end side is fixed to the central portion of the diaphragm 1b at the rear side of the diaphragm 1b. The bobbin 1d, the outer circumference is fixedly supported by the frame 1a, and the inner circumference is a damper 1e fixed to the bobbin 1d, and the voice coil 1f wound around the bobbin 1d, , Between the spider 1g for supporting the voice coil 1f, the ring-shaped permanent magnet 1h disposed outside the voice coil 1f, and between the frame 1a and the permanent magnet 1h. Ring-shaped front plate 1i fixedly arranged, ring-shaped rear plate 1j covering the lower part of permanent magnet 1h, and zero Ring-shaped pole piece protruding from the rear plate 1j to the inside of the bobbin 1d with a vibration space in which the bobbin 1d vibrates up and down between the magnet 1h and the front plate 1i. 1k and a dust cap 1l disposed at the center of the diaphragm 1b.

In the dynamic driver unit 1 configured as described above, the permanent magnet 1h, the front plate 1i, the rear plate 1j, and the pole piece 1k constitute a magnetic circuit, and a current is applied to the voice coil 1f. When applied and magnetized, the voice coil 1f is pulled or pushed out according to the magnetic polarity of the voice coil 1f. That is, when the voice coil 1f and the permanent magnet 1h become the same magnetic polarity, the voice coil 1f and the permanent magnet 1h are pushed out, and when the voice coil 1f and the permanent magnet 1h become different magnetic polarities, the voice coil 1f is vibrated. do. When the voice coil 1f vibrates, the diaphragm 1b fixed to the voice coil 1f vibrates and generates sound.

On the other hand, by shielding the backhaul formed in the rear of the dynamic driver unit 1 with the acoustic filter 2, not only the external noise shielding, but also the sound generated by the diaphragm operation can be shielded back to the backhaul.

Referring to FIG. 5, the ear set proposed in the present invention may include a tube 3 passing through the dynamic driver unit 1 and forming a hole in the center of the dust cap in the configuration of the dynamic driver unit 1 of FIG. 4. It further includes an in-ear microphone 4 embedded in the tube 3.

The entire volume can be made compact by minimizing the installation space by forming a hollow channel in front of the speaker, which is isolated from the output space of the speaker sound by the tube 3 and in which the in-ear microphone 4 is incorporated.

One end of the tube 3 is preferably coupled to any one of a rear plate, a pole piece, and a front plate, and the state of communication with the backhaul is maintained. On the other hand, the other end may be fixed to the nozzle or the like.

One end of the tube 3 is preferably covered with an acoustic filter 2.

In the case of the existing earset without the acoustic filter 2, the sound generated by the diaphragm operation is outputted back to the backhaul and introduced into the in-ear microphone 4 through the tube 3. Thus, howling may occur.

However, in the case of the earset having the acoustic filter 2 proposed in the present invention, when the sound generated according to the diaphragm operation is outputted back to the backhaul, only the low range of less than 100 Hz is passed through the acoustic filter 2 and output. do.

Meanwhile, in the case of a wireless earset having a Bluetooth communication module and a DSP, filtering is performed to reduce the amount of data for wireless transmission, thereby removing high and low frequencies. That is, the low frequency range of less than 100 Hz reversely output to the backhaul according to the operation of the diaphragm is completely removed in the filtering process for the wireless transmission, so that substantially all noise input to the in-ear microphone 4 is removed.

Referring to FIG. 6, in the present embodiment, the earset to which the balanced armature driver unit is applied, the noise shielding earset of the present invention includes a balanced armature driver unit 5 and a backhaul formed at the rear of the balanced armature driver unit 5. It includes an acoustic filter (2) to cover.

In addition, even when sound is reversely output through the backhaul by the operation of the balanced armature driver unit 5, only the low range of 100 Hz or less is output via the acoustic filter 2.

Referring to FIG. 7, the balanced armature driver unit 5 presented as an example of the present invention includes a frame 5a, a pair of permanent magnets 5b provided in the frame 5a, and a permanent magnet spaced apart from each other. The yoke plate 5c covering the 5b, one side having an air gap and positioned between the permanent magnets 5b, and the other side of the armature 5d fixed to the frame 5a, and the armature ( Coil 5e wound around a part of 5d and forming an alternating magnetic field between armature 5d and permanent magnet 5b, connecting rod 5f connected to armature 5d, and connecting rod 5f. It is connected to the vibration and comprises a diaphragm (5g) supported by the frame (5a).

The frame 5a may have an outer shape of a rectangular parallelepiped, but the outer shape of the frame 5a may not be limited thereto. The frame 5a may be made of a hard material such as aluminum or hard resin.

The pair of permanent magnets 5b are spaced apart from each other to form a DC magnetic field, and may be composed of an upper magnet and a lower magnet.

The yoke plate 5c may be provided to form a closed circuit including an upper magnet and a lower magnet. That is, a constant magnetic field is generated by the upper magnet and the lower magnet, and the return path to the static magnetic field is limited by the yoke plate 5c. Thus, the yoke plate 5c may be formed of a material having a high magnetic permeability with high magnetic properties.

The armature 5d is positioned at one end between the pair of permanent magnets 5b spaced apart from each other. The other end opposite to one end may be formed in a bending structure bent in an upward direction and fixed to the frame 5a. The other end of the bending structure may be modified in various forms, and any form can be applied as long as the structure can be fixed to the frame 5a. The other end of the bending structure allows the overall height to be lowered, thereby reducing the volume. The armature 5d can be formed by stamping out a metal strip. The metal strip is easy to bend one end. The armature 5d may be comprised of conventional magnetic materials such as permalloy (or iron-nickel magnetic alloy), iron-silicon materials such as silicon steel, or other materials. The armature 5d may be formed of a material having high magnetic permeability with high magnetic properties. The armature 5d located between the permanent magnets 5b may include an air gap between the permanent magnet 5b and the armature 5d.

The coil 5e is wound around a part of the armature 5d and, when a signal current is applied, generates magnetic flux in the armature 5d, so that an alternating magnetic field is formed between the armature 5d and the permanent magnet 5b.

The connecting rod 5f may be made of a rigid nonmagnetic material.

In the balanced armature driver unit 5 configured as described above, when a signal current is applied to the coil 5e, an alternating magnetic field formed between the armature 5d and the permanent magnet 5b by the magnetic flux generated in the armature 5d is permanent. When superposed on the direct current magnetic field formed between the magnets 5b, the armature 5d deforms in a vertical direction. Accordingly, the connecting rod 5f connected to the armature 5d is displaced in the vertical direction. And the displacement of the connecting rod 5f is transmitted to the diaphragm 5g connected and fixed to the upper end part, and a vibration membrane vibrates, and can generate a sound. The generated sound is emitted to the outside through the nozzle and finally delivered to the user's ear.

On the other hand, by shielding the backhaul formed in the rear of the balanced armature driver unit 5 with the acoustic filter 2, not only the external noise shielding, but also the sound generated by the operation of the diaphragm 5g can be shielded back to the backhaul. .

On the other hand, the balanced armature driver unit 5 and the in-ear microphone may be housed together in one case, and are separated from the output space of the speaker sound by a tube, and the in-ear microphone may be embedded inside the tube. . Since the functions described with reference to FIG. 5 apply substantially the same, duplicate description thereof will be omitted.

The technical spirit of the present invention has been described through several embodiments.

It will be apparent to those skilled in the art that the present invention may be variously modified or changed from the description of the present invention. In addition, even if not explicitly shown or described, those skilled in the art to which the present invention pertains various modifications, including the technical idea according to the present invention from the description of the present invention. Is obvious, and still belongs to the scope of the present invention. The above embodiments described with reference to the accompanying drawings are described for the purpose of illustrating the present invention, and the scope of the present invention is not limited to these embodiments.

Claims

A driver unit for generating sound; And

A noise shield earset having an acoustic filter including an acoustic filter covering a backhaul formed in the driver unit to allow air to pass through and shield external noise.
The method of claim 1,

The acoustic filter,

A filter layer for selectively forming a through hole and a sound movement path; And

Noise shielding earset having an acoustic filter comprising a plate is formed in the through-hole selectively communicating with the through and sound movement path.
The method of claim 2,

And the filter layer and the plate are repeatedly stacked on each other, and the acoustic shielding earset having an acoustic filter in which the through hole of the plate and the through hole or the sound movement path of the filter layer communicate with each other.
The method of claim 3,

A through-hole formed in the plate adjacent to the filter layer is a noise shield earset having an acoustic filter communicated at different ends of the sound movement path of the filter layer.
The method of claim 3,

A noise shield earset having acoustic filters in which sound movement paths of neighboring filter layers are orthogonal to each other.
The method of claim 2,

And a sound shielding earset having an acoustic filter filled with sound absorbing material in the sound movement path.
The method of claim 6,

The sound absorbing material is a noise shield earset having an acoustic filter using any one or more of polyester, glass fiber, mineral wool, glass wool, polyurethane.
The method of claim 1,

And said driver unit has an acoustic filter that is a dynamic driver unit or a balanced armature driver unit.
The method of claim 8,

The dynamic driver unit,

Hollow cone frame,

A hollow cone-shaped diaphragm vibrating inside the frame;

Edge surround for elastically supporting the front end of the diaphragm to the front end of the frame;

Bobbin front end is fixed to the central portion of the diaphragm in the rear side of the diaphragm;

A damper fixedly supported on the outer periphery of the frame and fixed on the inner periphery of the bobbin;

A voice coil wound around the bobbin;

A spider supporting the voice coil;

A ring-shaped permanent magnet disposed outside the voice coil;

A ring-shaped front plate fixedly disposed between the frame and the permanent magnet;

A ring-shaped rear plate covering the lower portion of the permanent magnet;

A ring-shaped pole piece protruding from the rear plate to the inside of the bobbin with a vibration space in which the bobbin vibrates up and down between the permanent magnet and the front plate; And

Noise shielding earset having an acoustic filter including a dust cap disposed in the center of the diaphragm.
The method of claim 8,

The balanced armature driver unit,

Frame,

A pair of permanent magnets installed in the frame spaced apart from each other,

A yoke plate covering the permanent magnet,

One side has an air gap (Air gap) and is located between the permanent magnet, the other side and the armature is fixed to the frame,

A coil wound around a portion of the armature and forming an alternating magnetic field between the armature and the permanent magnet;

A connecting rod connected to the armature,

Is connected to the connecting rod is made of vibration, comprising a diaphragm supported by the frame

Noise shielding earset with acoustic filter.
The method of claim 9 or 10,

A tube isolating the output space of the sound generated from the driver unit; And

A noise shield earset having an acoustic filter including a microphone embedded in the tube.