KR102577024B1 - Receiver having pressure equilibrium structure - Google Patents

Abstract

The present invention relates to a receiver having an air pressure balance structure.
The present invention relates to 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 that vibrates by mutual electromagnetic force with the magnetic circuit; A diaphragm to which a voice coil is attached and which vibrates by the voice coil to generate sound; A protector is coupled to the upper surface of the diaphragm and surrounds the outside of the magnetic circuit at a distance from the outer periphery of the magnetic circuit. The protector has an air pressure balance hole that can communicate with the space between the magnetic circuit and the air pressure of the protector. Provided is a receiver having an air pressure balance structure, wherein an air path is formed by a gap between the balance hole, the magnetic circuit, and the protector.

Description

Receiver having an air pressure balance structure {RECEIVER HAVING PRESSURE EQUILIBRIUM STRUCTURE}

The present invention relates to a receiver having an air pressure balance structure.

The ANC function is a technology that cancels out external noise by utilizing the reverse wavelength of noise. It is a technology that blocks out surrounding noise when wearing earphones, allowing you to focus more on sound quality. Noise generally accounts for a large portion of the low-pitched range. Therefore, as a condition for implementing the excellent ANC function, noise in the low-pitched range is collected by several microphones to generate canceling sound waves of reverse phase to cancel out external noise.

Earphones are largely divided into closed-type earphones, in which all parts except the sound emitting port inserted into the ear canal are blocked, and open earphones, which have tuning holes and ducts in addition to the sound emitting port.

Closed earphones are designed to transmit the sound of the receiver installed in the earphone directly into the user's ear, allowing sound to be heard even with a small output. Especially in the case of canal-type earphones that are inserted into the user's ear through an earpiece, they block out external noise. It has the advantage of excellent sound insulation.

However, in the case of canal-type earphones, as the ear canal is completely sealed, a difference in air pressure between the inside and outside of the ear canal occurs, which may cause deafness or discomfort depending on the person.

Figure 1 is a diagram showing a canal-type earphone equipped with an air pressure equalizing means according to the prior art. The canal-type earphone according to the prior art largely includes a speaker unit (1) and a housing that accommodates the speaker unit (1) and includes a front housing (10) and a rear housing (20). The speaker unit 1 installed inside the housing includes a cylindrical frame, a magnetic circuit installed inside the frame, and a vibration that vibrates up and down by the magnetic force of the magnetic circuit. The frame, that is, the external shape of the speaker unit (1), is cylindrical, and the inner peripheral surface of the front housing (10) is in contact with the outer peripheral surface of the speaker unit (1), so that the speaker unit (1) is a speaker unit ( 1) It is sealed between the front and back.

At this time, the canal type earphone forms a sound conduit 12 in front of the front housing 10, and a sealed eartip made of rubber or sponge is mounted on the sound conduit 12. Therefore, the ear canal and the outside of the canal type earphone are sealed, so when worn and used, the air is sealed around the ear canal and the air is compressed in the ear. The compressed air in the ear puts pressure on the eardrum, causing a stuffy feeling, creating discomfort and discomfort. Therefore, an intentional leak hole hypothesis is needed to reduce hearing loss and release air pressure.

In the case of the prior art, a leak hole 14 is installed to allow air from the front of the diaphragm to leak to the front of the front housing 10, as shown in Figure 1, or air from the front of the diaphragm to the side of the front housing 10a, as shown in Figure 2. A leak hole (14a) is installed to leak, or the air in front of the diaphragm is leaked to the rear housing (20) through the rear of the front housing (10a) through the conduit (14b) as shown in FIG. 3.

The air pressure balancing structure according to the prior art had the disadvantage of limiting the shape of the earphone itself because the front housing 10 of the earphone must be provided with a shape for air pressure equalization.

Republic of Korea Patent Publication No. 10-2002-0015633 Republic of Korea Patent No. 10-1177322

The purpose of the present invention is to provide a receiver having an air pressure balancing structure that can achieve air pressure balance with the receiver itself.

The present invention relates to 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 that vibrates by mutual electromagnetic force with the magnetic circuit; A diaphragm to which a voice coil is attached and which vibrates by the voice coil to generate sound; A protector is coupled to the upper surface of the diaphragm and surrounds the outside of the magnetic circuit at a distance from the outer periphery of the magnetic circuit. The protector has an air pressure balance hole that can communicate with the space between the magnetic circuit and the air pressure of the protector. Provided is a receiver having an air pressure balance structure, wherein an air path is formed by a gap between the balance hole, the magnetic circuit, and the protector.

In addition, as another example of the present invention, a receiver having an air pressure balancing structure is provided, further comprising a mesh covering the air pressure balancing hole of the protector.

Additionally, the present invention includes a cylindrical frame having a space for accommodating parts; A yoke that divides the inner space of the frame up and down and has a bottom surface, a cylindrical part bent from the bottom surface, a flange part formed on the outer periphery of the cylindrical part, and a communication hole formed by removing a part of the flange part; A first speaker unit installed on the upper part of the yoke and including a first permanent magnet, a first plate, a first voice coil, and a first diaphragm; a second speaker unit installed at the lower part of the yoke and including a second permanent magnet, a second plate, a second voice coil, and a second diaphragm; A first protector that is coupled to the top and sides of the frame and protects the first speaker unit; And an air path formed by removing a portion of the upper surface and side of the frame so as to have a gap with the first protector, wherein the first protector has an air pressure balance structure characterized by having an air pressure balance hole communicating with the air path. A receiver provided is provided.

In addition, as another example of the present invention, a receiver having an air pressure balancing structure is provided, further comprising a mesh attached to the air pressure balancing hole of the first protector.

In addition, as another example of the present invention, the first protector provides a receiver having an air pressure balance structure, wherein the first protector has a second speaker soundproofing hole that communicates with the communication hole of the yoke.

In addition, as another example of the present invention, a receiver having an air pressure balance structure is provided, further comprising a third plate attached to the upper surface of the flange portion of the yoke and helping to install the first diaphragm.

In addition, as another example of the present invention, the first protector includes a side coupled to the side of the frame, an upper surface attached to the upper surface of the frame and the outer periphery of the first diaphragm, and a step protruding upward to avoid interference with the first diaphragm. A receiver having an air pressure balance structure is provided.

In addition, as another example of the present invention, a receiver having an air pressure balance structure is provided, wherein a first speaker soundproof hole for emitting sound reproduced from the first diaphragm is formed in the step portion.

In addition, as another example of the present invention, the first protector provides a receiver having an air pressure balance structure, characterized in that it includes a side coupled to the side of the frame and an upper surface coupled to the outer periphery of the diaphragm.

In addition, as another example of the present invention, a receiver having an air pressure balance structure is provided, further comprising a second protector that is attached to the side of the frame and the lower surface of the second diaphragm and protects the second speaker unit.

In addition, as another example of the present invention, the first protector provides a receiver having a pressure balancing structure, characterized in that it surrounds only the upper portion of the side of the frame.

In addition, as another example of the present invention, the part of the frame not surrounded by the first protector and at least a part of the second speaker unit include a receiver having a raised pressure balance structure, wherein the cross section and volume are determined independently of the first protector. to provide.

In addition, the present invention includes a cylindrical frame having a space for accommodating parts; A yoke that divides the inner space of the frame up and down and has a bottom surface, a cylindrical part bent from the bottom surface, a flange part formed on the outer periphery of the cylindrical part, and a communication hole formed by removing a part of the flange part; A first speaker unit installed on the upper part of the yoke and including a first permanent magnet, a first plate, a first voice coil, and a first diaphragm; a second speaker unit installed at the lower part of the yoke and including a second permanent magnet, a second plate, a second voice coil, and a second diaphragm; A first protector that is coupled to the top and sides of the frame, protects the first speaker unit, and has a sound emission hole for emitting sound and an air pressure balance hole formed by removing part of the side wall to the bottom; and a portion of the upper and side surfaces of the frame are removed so as to have a gap with the first protector, and an air path extending from the sound emission hole to the air pressure balancing hole. It provides a receiver having an air pressure balancing structure, comprising a.

In addition, as another example of the present invention, the frame is provided with a guide protrusion inserted into the lower end of the groove, and the air pressure balance hole is provided with an air pressure balance structure characterized in that the groove deleted in the first protector is defined by the guide protrusion. Provides a receiver that

In addition, as another example of the present invention, a receiver having an air pressure balancing structure is provided, further comprising a mesh attached to the air pressure balancing hole and capable of controlling the amount of ventilation.

The receiver provided by the present invention has the advantage of being independent of the shape of the earphone since it is independently provided with an air path for air pressure equalization.

In addition, the receiver provided by the present invention does not require separate parts for the air pass, enabling efficient internal design, and has positive effects in production, such as reducing the defect rate and shortening the process time.

1 is a diagram showing a canal-type earphone equipped with an air pressure equalizing means according to the prior art;
Figure 2 is a diagram showing a canal-type earphone equipped with an air pressure equalizing means according to another prior art;
Figure 3 is a diagram showing a canal-type earphone equipped with an air pressure equalizing means according to another prior art;
Figure 4 is a cross-sectional view of a receiver having an air pressure balance structure according to the first embodiment of the present invention;
Figure 5 is an exploded view of a receiver having an air pressure balance structure according to the first embodiment of the present invention;
Figure 6 is a cross-sectional view of a receiver having an air pressure balance structure according to a second embodiment of the present invention;
Figure 7 is an exploded view of a receiver having an air pressure balance structure according to a third embodiment of the present invention;
Figure 8 is a perspective view of a receiver having an air pressure balance structure according to a third embodiment of the present invention;
Figure 9 is a cross-sectional view taken along line AA of Figure 8;
Figure 10 is a cross-sectional view taken along line BB in Figure 8;
Figure 11 is a diagram schematically showing a receiver having an air pressure balance structure according to a third embodiment of the present invention installed in an earphone housing;
Figure 12 is a view showing a receiver having an air pressure balance structure according to a fourth embodiment of the present invention installed in an earphone housing;
13 is a cross-sectional view of a receiver having an air pressure balance structure according to a fifth embodiment of the present invention;
Figure 14 is a perspective view of a receiver having an air pressure balance structure according to a fifth embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Figure 4 is a cross-sectional view of a receiver having an air pressure balancing structure according to a first embodiment of the present invention, and Figure 5 is an exploded view of a receiver having an air pressure balancing structure according to a first embodiment of the present invention.

The receiver having an air pressure balance structure according to the first embodiment of the present invention includes a yoke 210 with a hollow pole 212 formed in the center, and a hollow pole attached to the yoke 210 at a predetermined distance from the pole 212. It is provided with a magnetic circuit including a type permanent magnet 220 and a top plate 230 attached to the upper surface of the permanent magnet 220. The lower end of the voice coil 300 is located in the air gap provided between the pole 212 and the permanent magnet 220, and the upper end of the voice coil 300 is attached to the diaphragm 400. When a signal is applied to the voice coil 300, it vibrates up and down due to mutual electromagnetic force with the magnetic circuit according to the signal, and the diaphragm 400 to which the top of the voice coil 300 is attached also vibrates and generates sound. .

Since the diaphragm 400 is made of a polymer film, a ring 410 of injection material can be attached to the outer periphery of the diaphragm 400 to improve handling difficulties during assembly. Ring 410 is attached to top plate 230.

Meanwhile, a protector 500 is provided that is coupled to the upper surface of the diaphragm 400 and surrounds the outside of the magnetic circuit at a distance 550 from the outer periphery of the magnetic circuit. This gap 550 is used as an air path for air pressure equalization between the front and rear of the receiver.

The protector 500 includes a cylindrical side wall 510 positioned at a distance from the outer periphery of the magnetic circuit, and an upper surface 520 bent inward and extended at the top of the side wall 510. The upper surface 520 is attached to the outer peripheral surface of the diaphragm 400. Additionally, in order to avoid interference between the diaphragm and the protector 500 when the diaphragm 400 vibrates, the protector 500 is provided with a step portion 530 that protrudes upward on the inside of the upper surface 520.

Here, the upper surface 520 of the protector 500 is provided with an air pressure balance hole 522 that can communicate with the gap 550 between the side wall 510 and the magnetic circuit. The air pressure equalization hole 530 is located further outside the contact portion between the protector 500 and the diaphragm 400. In addition, a sound emission hole 532 is provided at the center of the step portion 530 to emit sound reproduced by the diaphragm 400. At this time, the upper surface 520 is attached to the outer periphery of the diaphragm 400, so the air pressure balance hole 522 and the sound emission hole 532 do not communicate with each other.

Meanwhile, a mesh 610 may be attached to the upper surface 520 of the protector 500. The mesh 610 can control the amount of air inflow through the air pressure balance hole 530 by adjusting the sieve. The mesh 610 can be attached to the protector 500 with an adhesive member such as double-sided tape 620. In this case, the double-sided tape 620 is not breathable, so it is perforated 622 so as not to cover the air pressure equalization hole 530. ) must be in place.

Additionally, a circuit board 700 may be disposed on the lower surface of the yoke 210 to transmit an electrical signal to the voice coil 300. The circuit board 700 has a backhole 710 formed at a position corresponding to the hollow pole 212 of the yoke 210 to prevent air from flowing in and out of the rear of the diaphragm 400. The mesh 810 can also be attached to the backhole 710 using double-sided tape 820, and the double-sided tape 820 is perforated so as not to block the backhole 710. The mesh 810 attached to the backhole 710 can control the amount of air inflow through the backhole 710.

Figure 6 is a cross-sectional view of a receiver equipped with an air pressure balance structure according to a second embodiment of the present invention.

In the first embodiment of the present invention, the protector 500 is provided with a step portion 530 (see FIG. 4), but like the second embodiment, the protector 500' has a separate step portion 530 (see FIG. 4). Instead of being provided, the upper surface 520' may extend only to a position in contact with the outer peripheral surface of the diaphragm 400.

Figure 7 is an exploded view of a receiver having an air pressure balancing structure according to a third embodiment of the present invention, and Figure 8 is a perspective view of a receiver having an air pressure balancing structure according to a third embodiment of the present invention.

A receiver equipped with an air pressure balance structure according to the third embodiment of the present invention includes a magnetic circuit and a vibration unit installed in a cylindrical frame (100a). A yoke 210a is installed in the frame 100a to divide the inner space of the frame 100a upward and downward. With the yoke 210a as the boundary, a first speaker unit is installed on the upper part of the yoke 210a, and a second speaker unit is installed on the lower part of the yoke 210a.

The yoke 210a is provided with a circular bottom surface, a cylindrical portion bent from the bottom surface, a flange portion formed on the outer periphery of the cylindrical portion, and a communication hole 212a formed by removing a portion of the flange portion. Meanwhile, the frame 100a is provided with an air pressure equalization groove 110a whose outer part is removed to avoid the location of the communication hole 212a of the yoke 210a.

A first speaker unit is installed on the upper part of the yoke 210a. The first speaker unit includes a first permanent magnet 220a attached to the bottom, and a first top plate 230a attached to the top of the first permanent magnet 220a. , a first voice coil 310a, and a first diaphragm 410a. The outer periphery of the first permanent magnet 220a and the first top plate 230a is formed at a distance from the cylindrical portion of the yoke 210a, and this gap is the first magnetic gap. The lower end of the first voice coil 310a is located in the magnetic gap. The upper end of the first voice coil 310a is attached to the first diaphragm 410a, and the first diaphragm 410a vibrates due to the vibration of the first voice coil 310a and generates sound. The first diaphragm 410a is attached to the flange portion of the yoke 210a. At this time, a guide ring 412a may be attached to the edge of the first diaphragm 410a to facilitate installation of the first diaphragm 410a. Since the first diaphragm 410a is thin and difficult to handle, by attaching a guide ring 412a made of injection molding or metal, which is thick and has greater rigidity than the first diaphragm 410a, the first diaphragm 410a ) can be easily installed. A third plate 260a may be additionally attached to the flange portion. The third plate 260a is a magnetic structure to compensate for magnetic flux leakage occurring at a bent portion between the cylindrical portion of the yoke and the flange portion. The third plate 260a is attached to the inside on the flange portion, and has a rib structure on the third plate 260a that guides the position of the guide ring 412a, so that the third plate 260a is 1 It can also serve as a guide to the installation position of the diaphragm 410a.

Meanwhile, a second speaker unit is installed at the lower part of the yoke 210a. The second speaker unit includes a second permanent magnet 240a located on the lower surface of the flange portion of the yoke 210a, and a second top plate 250a attached to the lower surface of the second permanent magnet 240a. At this time, the second permanent magnet 240a and the second top plate 250a may be insert-molded when the frame 100a is injection-molded. At this time, the second permanent magnet 240a and the second top plate 250a have a ring shape, and the inner peripheral part is installed at an interval from the cylindrical part of the yoke 210a, and this interval is the second magnetic gap. The upper end of the second voice coil 320a is located in the second magnetic gap, and the lower end of the second voice coil 320a is attached to the second diaphragms 420a and 421a. The outer peripheral portions of the second diaphragms 420a and 421a are seated on the lower surface of the frame 100a. The second diaphragms 420a and 421a may also have a guide ring 422a attached to an edge of the second diaphragm 420a to facilitate installation. The guide ring 422a is guided by the shape of the inner peripheral surface of the frame 100a so that the second diaphragms 420a and 421a can be aligned concentrically.

Additionally, a second protector 700a that protects the second speaker unit may be installed below the second speaker unit. The outer peripheral surface of the second protector (700a) located on the lower surface of the second diaphragm (420a) and the second guide ring (422a) is in contact with the inner peripheral surface of the frame (100a) to guide the installation position.

As described above, the yoke 210a has a communication hole 212a formed by removing a portion of the flange portion. The sound generated from the second speaker unit is emitted upward through this communication hole 212a.

Meanwhile, the yoke 210a, the first permanent magnet 220a, and the first top plate 230a are perforated in the center and serve as backhauls. Accordingly, the first diaphragm 410a can vibrate smoothly. At this time, meshes 270a and 280a covering the perforations may be attached to the upper surface of the first top plate 230a and the lower surface of the yoke 210a, respectively.

Referring to FIG. 8, the first protector 500a provided in the receiver having the air pressure balance structure according to the third embodiment of the present invention is coupled to the outer and upper surfaces of the frame 100a. It includes a cylindrical side wall 510a in contact with the outer surface of the frame 100a, and an upper surface 520a bent inward and extended at the top of the side wall 510a. The upper surface 520a is attached to the outer peripheral surface of the first diaphragm 410a. In addition, in order to avoid interference between the first diaphragm 410a and the protector 500a when the first diaphragm 410a vibrates, the protector 500a has a step portion 530a protruding upward on the inside of the upper surface 520a. Equipped with Additionally, a portion of the side wall 510a of the protector 500a is removed to form a hole 512a, and a terminal for connection to an external terminal may be exposed through this hole 512a.

As previously described, the frame 100a is provided with an air pressure balance groove 110a whose outer portion is removed to avoid the location of the communication hole 212a of the yoke 210a, and thus the side wall of the first protector 500a. An air path that can communicate with the rear of the receiver is formed by the hyperbarometric pressure balance groove (110a).

Here, the upper surface 520a of the first protector 500a is provided with an air pressure equalization hole 522a that can communicate with the air pressure equalization groove 110a. The air pressure equalization hole 522a is located further outside the contact portion between the first protector 500a and the first diaphragm 410a. Additionally, a first sound emission hole 532a is provided at the center of the step portion 530a to emit sound reproduced by the first diaphragm 410a. At this time, the upper surface 520a is attached to the outer periphery of the first diaphragm 410a, so the air pressure balance hole 522a and the first sound emission hole 532a do not communicate with each other.

Meanwhile, the first protector 500a is provided with a second sound emission hole 524a that communicates with the communication hole 212a of the yoke 210a. The second sound emission hole 524a emits sound reproduced by the second speaker unit disposed below the yoke 210a upward.

Additionally, a mesh 610a may be attached to the upper surface 520a of the first protector 500a. The mesh 610a can control the amount of air inflow through the air pressure balance hole 522a by adjusting the sieve. The mesh 610a can be attached to the first protector 500a with an adhesive member such as double-sided tape 620a. In this case, since the double-sided tape 620a is not breathable, it is perforated so as not to cover the air pressure equalization hole 522a. (622a). Additionally, the mesh 610a should not cover the second sound emission hole 524a.

Figure 9 is a cross-sectional view taken along line A-A of Figure 8. Referring to FIG. 9, it can be seen that the structure in which sound generated from the second speaker unit is emitted upward from the first protector 500a.

Figure 10 is a cross-sectional view taken along line B-B in Figure 8. Referring to FIG. 10, an air path 550a is formed by the air pressure balance groove 110a (see FIG. 7) formed by removing the first protector 500a and a portion of the outer portion of the frame 110a. Through the air pass 550a, air can flow between the front of the receiver and the rear of the receiver, thereby achieving air pressure balance.

Figure 11 is a diagram schematically showing a receiver having an air pressure balance structure according to a third embodiment of the present invention installed in an earphone housing.

A receiver having an air pressure balance structure may be installed within the earphone housing 30. At this time, the side wall of the first protector 500a is attached or fixed to the inner surface of the earphone housing 30. The upper part of the earphone housing 30 is provided with an acoustic passage 32 that emits sound to the user's ears. The sound of the first speaker unit is emitted upward through the first sound emission hole (532a) formed in the center of the step portion (530a) of the first protector (500a), and the second sound emission hole (524a; see FIG. 8) is discharged upward. The sound of the second speaker unit is emitted upward and transmitted to the sound passage 32.

At this time, air flow is possible between the upper and lower parts of the receiver within the housing 30 regardless of sound through the air path 550a between the side wall of the first protector 500a and the frame 100a, and through this, air pressure is balanced. This comes true. At this time, a ventilation hole 34 may be formed in the housing 30 to allow air to flow between the lower part of the receiver and the outside.

The receiver itself is provided with an air pressure balance structure, and since it is unrelated to the housing 30 installed with the receiver and the air path 550a, it is possible to secure the air pressure balance structure regardless of the shape and size of the housing 30. There is an advantage to being able to do this. In other words, since the housing 30 does not require a separate structure or separate parts to form an air path, efficient internal design is possible, and it also has positive effects in production, such as reducing the defect rate and shortening the process time.

Figure 12 is a diagram showing a receiver having an air pressure balance structure according to a fourth embodiment of the present invention installed in an earphone housing.

The receiver having the air pressure balance structure according to the fourth embodiment of the present invention is installed in the upper housing 30 and the lower housing 40, and an acoustic passage 32 is formed in the upper housing 30. Additionally, for installation of the receiver, a bracket 30 corresponding to the shape of the receiver may be additionally provided. The first protector 500b is different from the third embodiment in that it covers only a portion of the upper side of the frame 100b. Accordingly, the cross section and volume of the portion not surrounded by the first protector 500b can be determined regardless of the size of the first protector 500b. Accordingly, the size or volume of the cross section can be further increased. In the fourth embodiment of the present invention shown in Figure 12, the lower portion of the frame 100b not surrounded by the first protector 500b, that is, the portion located below the second permanent magnet and the second top plate and the second diaphragm ( The sizes of 420b), the second guide ring 422b, and the second protector 700b can be increased compared to the third embodiment. That is, the area and volume of the diaphragm of the second speaker unit can be adjusted, which has the advantage of facilitating tuning of acoustic characteristics while maintaining an air pressure balance structure.

Figure 13 is a cross-sectional view of a receiver having an air pressure balancing structure according to a fifth embodiment of the present invention, and Figure 14 is a perspective view of a receiver having an air pressure balancing structure according to a fifth embodiment of the present invention.

A receiver equipped with an air pressure balance structure according to the fifth embodiment of the present invention includes a magnetic circuit and a vibration unit installed in a cylindrical frame 100c. A yoke 210c is installed in the frame 100c to divide the internal space of the frame 100c upward and downward. With the yoke 210c as the boundary, a first speaker unit is installed on the upper part of the yoke 210c, and a second speaker unit is installed on the lower part of the yoke 210c.

The yoke 210c is provided with a circular bottom surface, a cylindrical portion bent from the bottom surface, a flange portion formed on the outer periphery of the cylindrical portion, and a communication hole 212c formed by removing a portion of the flange portion.

A first speaker unit is installed on the upper part of the yoke 210c. The first speaker unit includes a first permanent magnet 220c attached to the bottom, and a first top plate 230c attached to the top of the first permanent magnet 220c. , a first voice coil 310c, and a first diaphragm 410c. The outer periphery of the first permanent magnet 220c and the first top plate 230c is formed at a distance from the cylindrical portion of the yoke 210c, and this gap is the first magnetic gap. The lower end of the first voice coil 310c is located in the magnetic gap. The upper end of the first voice coil 310c is attached to the first diaphragm 410c, and the first diaphragm 410c vibrates due to the vibration of the first voice coil 310c and generates sound. The first diaphragm 410c is attached to the flange portion of the yoke 210c.

Meanwhile, a second speaker unit is installed at the lower part of the yoke 210c. The second speaker unit includes a second permanent magnet 240c located on the lower surface of the flange portion of the yoke 210c, and a second top plate 250c attached to the lower surface of the second permanent magnet 240c. At this time, the second permanent magnet 240c and the second top plate 250c may be insert-molded when the frame 100c is injection-molded. At this time, the second permanent magnet 240c and the second top plate 250c have a ring shape, and the inner peripheral part is installed at an interval from the cylindrical part of the yoke 210c, and this interval is the second magnetic gap. The upper end of the second voice coil 320c is located in the second magnetic gap, and the lower end of the second voice coil 320c is attached to the second diaphragm 420c. The outer peripheral portion of the second diaphragm 420c is seated on the lower surface of the frame 100c.

Additionally, a second protector 700c that protects the second speaker unit may be installed below the second speaker unit.

As described above, the yoke 210c has a communication hole 212c formed by removing a portion of the flange portion. The sound generated from the second speaker unit is emitted upward through this communication hole 212c.

Meanwhile, the yoke 210c, the first permanent magnet 220c, and the first top plate 230c are perforated in the center and play the role of a backhaul. Accordingly, the first diaphragm 410c can vibrate smoothly. At this time, a mesh 270c covering the perforated portion may be attached to the lower surface of the yoke 210c.

A first protector 500c is installed on the outside of the frame 100c to protect the first speaker unit and has a sound emission hole 522c for emitting sound. The first protector (500c) has a side wall (510c) surrounding the outer surface of the frame (100c) and an upper surface (520c) surrounding a portion of the upper surface, and a sound emission hole ( 522c) is formed, and the sound generated by the first diaphragm 410c and the second diaphragm 420c is emitted. A groove 110c is formed on the outer surface of the frame 100c to form an air path 530c at a distance from the inner surface of the first protector 500c. This groove (110c) allows air to communicate with the upper surface of the receiver, that is, the upper part of the sound emission hole (522c).

Meanwhile, the air path 530c formed by the groove 110c and the first protector 500c is connected to the air pressure balance hole 514c at the bottom. The air pressure balance hole 514c has a groove 512c extending to the bottom of the side wall 510c of the first protector 500c facing the groove 110c. At this time, the frame 100c is provided with a guide 120c inserted into the groove 512c. The upper end of the guide 120c is spaced from the upper end of the groove 512, thereby forming an air pressure balance hole 514c defined by the groove 512c and the guide 120c.

The air path 530c formed by the groove 110c and the first protector 500c connects the sound emission hole 522 and the air pressure balance hole 514c on the upper surface of the first protector 520c, and the air pressure balance hole 514c External air can pass in and out, allowing the difference between the pressure at the top of the receiver, that is, the part inserted into the user's ear canal, and the external pressure to be adjusted.

At this time, a mesh 600c that can adjust the amount of ventilation may be attached to the air pressure balance hole 514c. By adjusting the breathability of the mesh 600c as needed, acoustic characteristics can be adjusted without changing the overall receiver structure.

Claims (15)

delete delete delete delete delete delete delete delete delete delete delete delete A cylindrical frame having a space for accommodating parts;
A yoke that divides the inner space of the frame up and down and has a bottom surface, a cylindrical part bent from the bottom surface, a flange part formed on the outer periphery of the cylindrical part, and a communication hole formed by removing a part of the flange part;
A first speaker unit installed on the upper part of the yoke and including a first permanent magnet, a first plate, a first voice coil, and a first diaphragm;
a second speaker unit installed at the lower part of the yoke and including a second permanent magnet, a second plate, a second voice coil, and a second diaphragm;
It is combined with the top and sides of the frame, protects the first speaker unit, and the sound emission hole that emits sound and a part of the side wall are removed to the bottom, and the guide protrusion of the frame is inserted into the bottom of the groove, which is defined by the guide protrusion and groove. A first protector having an air pressure equalization hole; and
A receiver having an air pressure equalization structure, comprising an air path extending from the sound emission hole to the air pressure equalization hole, in which a portion of the upper and side surfaces of the frame are removed so as to have a gap with the first protector. According to clause 13,
A receiver having an air pressure balance structure further comprising a mesh that is attached to the air pressure balance hole and can adjust the amount of ventilation. delete