Receiver with pressure equalization structure

Abstract

The present invention relates to a receiver with a pressure equalization structure, the receiver comprising: a magnetic circuit including a yoke, a permanent magnet connected 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 that allows the voice coil to be attached to the diaphragm and vibrated by the voice coil to produce sound; and a protector that is connected to the upper surface of the diaphragm and surrounds the outer side of the magnetic circuit in a manner with a gap from the outer peripheral portion of the magnetic circuit, wherein the protector has a hole that is connected to the gap portion of the magnetic circuit and an air path formed by the hole of the protector and the gap between the magnetic circuit and the protector.

Description

Technical Field

[0001] The present disclosure relates to a receiver having a pressure equalization structure. Background Art

[0002] The Adaptive Noise Cancellation (ANC) function is a technology that uses noise of the opposite wavelength to cancel ambient noise, which allows users to focus more on sound quality by shielding ambient noise when wearing headphones. Noise usually occupies a large part in the low-frequency range. Therefore, as a condition for achieving excellent ANC function, multiple microphones collect noise in the low-frequency range and generate canceling sound waves with opposite phases to cancel ambient noise.

[0003] Headphones are divided into closed-type headphones and open-type headphones. For closed-type headphones, all parts except the sound emission hole inserted into the ear canal are blocked, while open-type headphones include tuning holes and conduits in addition to the sound emission hole.

[0004] Closed-type headphones transmit the sound of a receiver installed in the headphones directly to the user's ears, allowing the user to hear the sound even with low power. In particular, the inner core type headphones inserted into the user's ears through the earpiece include excellent sound insulation performance that shields external noise.

[0005] However, in the case of an inner core type earphone, since the ear canal is completely sealed, a pressure difference is generated between the inside and the outside of the ear canal, and therefore, some people may feel pressure in the ear or others may feel uncomfortable.

[0006] Figure 1 1 is a view illustrating a core-type earphone equipped with a pressure equalization device according to the related art. The core-type earphone according to the related art includes a speaker unit 1 and a shell that accommodates the speaker unit 1, and the shell includes a front shell 10 and a rear shell 20. The speaker unit 1 installed inside the shell includes a cylindrical frame with a magnetic circuit installed inside, and a diaphragm that vibrates up and down by the magnetic force of the magnetic circuit. The frame, that is, the outside of the speaker unit 1 includes a cylindrical shape, and the inner circumferential surface of the front shell 10 and the outer circumferential surface of the speaker unit 1 are in contact with the speaker unit 1, so that the speaker unit seals a part between the front and rear of the speaker unit inside the front shell 10.

[0007] Here, the core-type earphone forms a sound tube 12 in front of the front housing 10, and a sealed earphone end formed of a rubber or sponge material is mounted on the sound tube 12. Therefore, the core-type earphone seals the ear canal from the outside, so that when the core-type earphone is 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 compresses the eardrum, causing a blocked ear and an uncomfortable feeling. Therefore, an intentional leakage hole is required to weaken the hearing and leak the air pressure.

[0008] In the case of related technologies, such as Figure 1 As shown in FIG. 1 , a leakage hole 14 is installed for leaking air from the front of the diaphragm to the front of the front housing 10, as shown in FIG. Figure 2 As shown in FIG. 1 , a leakage hole 14a is installed to leak the air in front of the diaphragm to the side of the front housing 10a, or the air leaks from the front of the diaphragm to the rear housing 20 through the duct 14b via the rear of the front housing 10a.

[0009] The pressure equalizing structure according to the related art needs to have a shape for pressure equalization in the front housing 10 of the earphone, resulting in a limitation on the shape of the earphone itself.

[0010] Related technical literature

[0011] Patent Literature

[0012] Korean Patent Publication No. 10-2002-0015633

[0013] Korean Patent Registration No.10-1177322 Summary of the invention

[0014] Technical issues

[0015] One aspect of the present disclosure provides a receiver having a pressure equalization structure, which can achieve pressure equalization only by the receiver itself.

[0016] Technical Solution

[0017] According to one aspect of the present disclosure, a receiver with a pressure equalization structure includes: a magnetic circuit including a yoke, a permanent magnet connected 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 that allows the voice coil to be attached to the diaphragm and vibrated by the voice coil to produce sound; and a protector that is connected to the upper surface of the diaphragm and surrounds the outer side of the magnetic circuit with a gap from the outer periphery of the magnetic circuit, wherein the protector has a hole connected to the gap portion of the magnetic circuit, and an air path formed by the hole of the protector and the gap between the magnetic circuit and the protector.

[0018] Furthermore, as another example of the present disclosure, the receiver may further include a mesh portion covering the pressure equalization hole of the protector.

[0019] According to another aspect of the present disclosure, a receiver with a pressure equalization structure includes: a cylindrical frame having a gap for accommodating components; a yoke vertically dividing an internal space of the frame and including a bottom surface, a cylindrical portion bent from the bottom surface, a flange portion formed on an outer periphery of the cylindrical portion, and a connecting hole formed by removing a portion of the flange portion; a first speaker unit, the first speaker unit is installed above the yoke and includes a first permanent magnet, a first plate, a first voice coil and a first diaphragm; a second speaker unit, the second speaker unit is installed below the yoke and includes a second permanent magnet, a second plate, a second voice coil and a second diaphragm; a first protector, the first protector is connected to the upper surface and the side surface of the frame and protects the first speaker unit; and an air path, the air path is formed by removing a portion of the upper surface and the side surface of the frame to have a gap from the first protector, wherein the first protector has a pressure equalization hole connected to the air path.

[0020] In addition, as another example of the present disclosure, the receiver may further include: a mesh portion attached to the pressure equalization hole of the first protector.

[0021] Furthermore, as another example of the present disclosure, the first protector may include a second sound emission hole communicating with the communication hole of the yoke.

[0022] Furthermore, as another example of the present disclosure, the receiver may further include: a third plate attached to an upper surface of the flange portion of the yoke and facilitating installation of the first diaphragm.

[0023] In addition, as another example of the present disclosure, the first protector may include a side surface coupled to the side surface 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 portion protruding upward to avoid interference with the first diaphragm.

[0024] Furthermore, as another example of the present disclosure, the step portion may have a first sound emission hole that emits the sound reproduced by the first diaphragm.

[0025] Furthermore, as another example of the present disclosure, the first protector may include a side surface coupled to the side surface of the frame and an upper surface coupled to an upper surface of the frame and an outer peripheral portion of the diaphragm.

[0026] Furthermore, as another example of the present disclosure, the receiver may further include: a second protector attached to the side surface of the frame and the lower surface of the second diaphragm and protecting the second speaker unit.

[0027] Furthermore, as another example of the present disclosure, the first protector may surround only a portion of the upper side of the side surface of the frame.

[0028] Furthermore, as another example of the present disclosure, a cross-section and a volume of a portion of the frame that is not surrounded by the first protector and at least a portion of the second speaker unit are determined independently of the first protector.

[0029] According to another aspect of the present disclosure, a receiver having a pressure equalization structure includes: a cylindrical frame having a gap for accommodating components; a yoke vertically partitioning an internal space of the frame, and the yoke including a bottom surface, a cylindrical portion bent from the bottom surface, a flange portion formed on an outer periphery of the cylindrical portion, and a communication hole formed by removing a portion of the flange portion; a first speaker unit, the first speaker unit being mounted above the yoke and including a first permanent magnet, a first plate, a first voice coil, and a first diaphragm; a second speaker unit, the second speaker unit being mounted below the yoke and including a second permanent magnet, a second plate, a second voice coil, and a second diaphragm; a first protector, the first protector being coupled to an upper surface and a side surface of the frame and including a sound emission hole that protects the first speaker unit and emits sound, and a pressure equalization hole formed by removing a portion of a lower end portion of a side wall; and an air path having a gap with the first protector by removing a portion of an upper surface and a portion of a side surface of the frame, and the air path extending from the sound emission hole to the pressure equalization hole.

[0030] Furthermore, as another example of the present disclosure, the frame may have a guide protrusion inserted into a lower end portion of the recess, and the pressure equalization hole may be defined by the removed recess of the first protector.

[0031] Furthermore, as another example of the present disclosure, the receiver may further include: a mesh portion attached to the pressure equalization hole and adjusting a ventilation amount.

[0032] Beneficial Effects

[0033] The receiver according to the present disclosure has an air path only for pressure equalization, and therefore, does not limit the shape of the earphone.

[0034] Furthermore, the receiver according to the present disclosure does not require a separate component for an air path, and therefore, the interior thereof can be efficiently designed, which brings positive effects such as reduction in defective rate and shortening of process time in production. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a view illustrating a core-type earphone equipped with a pressure equalizing device according to the related art;

[0036] Figure 2 is a view illustrating a core-type earphone equipped with a pressure equalizing device according to another related art;

[0037] Figure 3is a view illustrating a core-type earphone equipped with a pressure equalizing device according to another related art;

[0038] Figure 4 is a cross-sectional view of a receiver having a pressure equalization structure according to a first embodiment of the present disclosure;

[0039] Figure 5 is an exploded view of a receiver with a pressure equalization structure according to a first embodiment of the present disclosure;

[0040] Figure 6 is a cross-sectional view of a receiver having a pressure equalization structure according to a second embodiment of the present disclosure;

[0041] Figure 7 is an exploded view of a receiver with a pressure equalization structure according to a third embodiment of the present disclosure;

[0042] Figure 8 is a perspective view of a receiver with a pressure equalization structure according to a third embodiment of the present disclosure;

[0043] Fig. 9 It is along Figure 8 A cross-sectional view taken along line AA;

[0044] Fig.10 It is along Figure 8 A cross-sectional view taken along line BB;

[0045] Fig.11 is a view schematically illustrating a state in which a receiver having a pressure equalizing structure according to a third embodiment of the present disclosure is installed in an earphone housing;

[0046] Fig.12 is a view illustrating a state in which a receiver having a pressure equalizing structure according to a fourth embodiment of the present disclosure is installed in an earphone housing;

[0047] Fig.13 is a cross-sectional view of a receiver having a pressure equalization structure according to a fifth embodiment of the present disclosure; and

[0048] Fig.14 is a perspective view of a receiver having a pressure equalization structure according to a fifth embodiment of the present disclosure. DETAILED DESCRIPTION

[0049] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings.

[0050] Figure 4 is a cross-sectional view of a receiver having a pressure equalization structure according to a first embodiment of the present disclosure, and Figure 5is an exploded view of a receiver having a pressure equalization structure according to a first embodiment of the present disclosure.

[0051] The receiver having a pressure equalization structure according to the first embodiment of the present disclosure includes: a magnetic circuit including a yoke 210 having a hollow column 212 formed in the center; a hollow type permanent magnet 220 attached to the yoke 210 with a predetermined gap from the column 212; and a top plate 230 attached to the upper surface of the permanent magnet 220. The lower end of the voice coil 300 is positioned in the air gap between the column 212 and the permanent magnet 220, and the upper end of the voice coil is attached to the diaphragm 400. When a signal is applied to the voice coil 300, the voice coil 300 vibrates up and down by mutual electromagnetic force with the magnetic circuit according to the signal, and the diaphragm 400 to which the upper end of the voice coil 300 is attached also vibrates and generates sound.

[0052] Since the diaphragm 400 is formed of a polymer film, a ring 410 of injection molding material may be attached to the outer periphery of the diaphragm 400 to improve handling ease during assembly. The ring 410 is attached to the top plate 230 .

[0053] Meanwhile, the protector 500 is coupled to the upper surface of the diaphragm 400 and surrounds the outside of the magnetic circuit with a gap 550 provided between the outer periphery of the magnetic circuit. The gap 550 serves as an air path for pressure equalization between the front and rear of the receiver.

[0054] The protector 500 includes a cylindrical side wall 510 positioned at a distance from the outer peripheral portion of the magnetic circuit and an upper surface 520 that is bent inwardly and extends from the upper end portion of the side wall 510. The upper surface 520 is attached to the outer peripheral surface of the diaphragm 400. In addition, in order to avoid interference between the diaphragm and the protector 500 when the diaphragm 400 vibrates, the protector 500 includes a step portion 530 that protrudes upward from the inner side of the upper surface 520.

[0055] Here, the upper surface 520 of the protector 500 has a pressure equalization hole 522 that can communicate with the gap 550 between the side wall 510 and the magnetic circuit. The pressure equalization hole 522 is located on the outer side except for 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 the sound reproduced by the diaphragm 400. Here, since the upper surface 520 is attached to the outer peripheral portion of the diaphragm 400, the pressure equalization hole 522 and the sound emission hole 532 are not communicated with each other.

[0056] Meanwhile, the mesh 610 may be attached to the upper surface 520 of the protector 500. The mesh 610 may adjust the amount of air introduced through the pressure equalization hole 522 by adjusting the screening ratio. The mesh 610 may be attached to the protector 500 by an adhesive member such as a double-sided tape 620. Here, the double-sided tape 620 is non-ventilated, and therefore, the perforations 622 are provided so as not to cover the pressure equalization hole 522.

[0057] In addition, a circuit board 700 for transmitting an electrical signal to the voice coil 300 may be arranged on the lower surface of the yoke 210. In the circuit board 700, a back hole 710 is formed in a position corresponding to the hollow column 212 of the yoke 210 without preventing air from entering and leaving the rear surface of the diaphragm 400. The mesh 810 may be attached to the back hole 710 by a double-sided tape 820, and the double-sided tape 820 is perforated so as not to block the back hole 710. The mesh 810 attached to the back hole 710 may control the amount of air introduced through the back hole 710.

[0058] Figure 6 is a cross-sectional view of a receiver having a pressure equalization structure according to a second embodiment of the present disclosure.

[0059] In the first embodiment of the present disclosure, the protector 500 includes a stepped portion 530 (see Figure 4 ), but as in the second embodiment, the protector 500' may not have a stepped portion 530 alone (see Figure 4 ), and the upper surface 520 ′ may extend only to a position in contact with the outer peripheral surface of the diaphragm 400.

[0060] Figure 7 is an exploded view of a receiver with a pressure equalization structure according to a third embodiment of the present disclosure, and Figure 8 is a perspective view of a receiver having a pressure equalization structure according to a third embodiment of the present disclosure.

[0061] The receiver with a pressure equalization structure according to the third embodiment of the present disclosure includes a magnetic circuit and a vibration unit in a cylindrical frame 100a. The frame 100a includes a yoke 210a that divides the internal space of the frame 100a up and down. Based on the yoke 210a as a boundary, a first speaker unit is installed above the yoke 210a, and a second speaker unit is installed below the yoke 210a.

[0062] The yoke 210a includes a circular bottom surface, a cylindrical portion bent from the bottom surface, a flange portion formed on the outer circumference of the cylindrical portion, and a communication hole 212a formed by removing a portion of the flange portion. Meanwhile, the frame 100a includes a pressure equalization groove 110a formed by removing an outer portion to avoid the position of the communication hole 212a of the yoke 210a.

[0063] The first speaker unit is installed above the yoke 210a, and the first speaker unit includes: a first permanent magnet 220a attached to the bottom surface, a first top plate attached to the upper surface 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 to be spaced apart from the cylindrical portion of the yoke 210a, and the interval is a first magnetic gap. The lower end of the first voice coil 310a is positioned 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 according to the vibration of the first voice coil 310a to produce sound. The first diaphragm 410a is attached to the flange portion of the yoke 210a. In this case, the guide ring 412a can be attached to the edge of the first diaphragm 410a to facilitate the installation of the first diaphragm 410a. Since the first diaphragm 410a is thin and difficult to handle, a guide ring 412a formed of an injection molded product or metal having a thickness and rigidity greater than that of the first diaphragm 410a may be attached to facilitate installation of the first diaphragm 410a. The third plate 260a may be additionally attached to the flange portion. The third plate 260a is a magnetic structure for compensating for magnetic flux leakage occurring in a curved portion between the cylindrical portion of the yoke and the flange portion. The third plate 260a is attached to the inner side of the flange portion and has a rib structure on the third plate 260a to guide the position of the guide ring 412a, so that the third plate 260a can also be used to guide the installation position of the first diaphragm 410a.

[0064] At the same time, the second speaker unit is installed below the yoke 210a. The second speaker unit includes a second permanent magnet 240a positioned 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. In this case, the second permanent magnet 240a and the second top plate 250a can be inserted into the injection during the injection molding of the frame 100a. Here, the second permanent magnet 240a and the second top plate 250a have an annular shape, and the inner periphery is installed to be spaced apart from the cylindrical portion of the yoke 210a, and the interval is the second magnetic gap. The upper end of the second voice coil 320a is positioned in the second magnetic gap, and the lower end of the second voice coil 320a is attached to the second diaphragm 420a and 421a. The outer periphery of the second diaphragm 420a and 421a is located on the lower surface of the frame 100a. The guide ring 422a may be attached to the edge of the second diaphragms 420a and 421a to facilitate installation of the second diaphragms 420a and 421a. The guide ring 422a is guided by the shape of the inner circumferential surface of the frame 100a to match the concentricity of the second diaphragms 420a and 421a.

[0065] In addition, a second protector 700a for protecting the second speaker unit may be installed under the second speaker unit. The outer peripheral surface of the second protector 700a is positioned on the lower surface of the second diaphragm 420a, and the second guide ring 422a contacts the inner peripheral surface of the frame 100a to guide the installation position.

[0066] As described above, the yoke 210a includes the communication hole 212a formed by removing a part of the flange portion. The sound generated by the second speaker unit is emitted upward through the communication hole 212a.

[0067] At the same time, the yoke 210a, the first permanent magnet 220a and the first top plate 230a are perforated in the center and act as back holes. Therefore, the first diaphragm 410a can vibrate smoothly. In this case, the perforated nets 270a and 280a can be attached to the upper surface of the first top plate 230a and the lower surface of the yoke 210a, respectively.

[0068] Reference Figure 8 , a first protector 500a provided in a receiver having a pressure equalization structure according to a third embodiment of the present disclosure is coupled to an outer surface and an upper surface of a frame 100a. The first protector 500a includes a cylindrical side wall 510a in contact with an outer surface of the frame 100a and an upper surface 520a that bends inwardly and extends from an upper end portion of the side wall 510a. The upper surface 520a is attached to an outer peripheral surface of the first diaphragm 410a. In addition, in order to avoid interference between the diaphragm 410a and the protector 500a when the first diaphragm 410a vibrates, the protector 500a has a step portion 530a that protrudes upward on an inner side portion of the upper surface 520a. In addition, a portion of the side wall 510a of the protector 500a is removed to form a hole 512a, and a terminal for connecting to an external terminal can be exposed through the hole 512a.

[0069] As described above, the frame 100a includes the pressure equalizing groove 110a, wherein the outer portion is removed to avoid the position of the communication hole 212a of the yoke 210a, and thus, an air path that can communicate with the rear surface of the receiver is formed through the side wall and the pressure equalizing groove 110a.

[0070] Here, the upper surface 520a of the first protector 500a has a pressure equalization hole 522a that can communicate with the pressure equalization groove 110a. The pressure equalization hole 522a is located on the outer side except the contact portion between the first protector 500a and the first diaphragm 410a. In addition, a first sound emission hole 532a is provided at the center of the step portion 530a to emit the sound reproduced by the first diaphragm 410a. Here, since the upper surface 520a is attached to the outer peripheral portion of the first diaphragm 410a, the pressure equalization hole 522a and the first sound emission hole 532a are not communicated with each other.

[0071] Meanwhile, the first protector 500a includes a second sound emission hole 524a that communicates with the communication hole 212a of the yoke 210a. The second sound emission hole 524a emits the sound reproduced by the second speaker unit disposed under the yoke 210a upward.

[0072] In addition, the mesh 610a may be attached to the upper surface 520a of the first protector 500a. The mesh 610a may adjust the amount of air introduced through the pressure equalization hole 522a by adjusting the screening ratio. The mesh 610a may be attached to the first protector 500a by an adhesive member such as a double-sided tape 620a. Here, the double-sided tape 620a is non-ventilated, and therefore, the double-sided tape 620a should be perforated 622a so as not to block the pressure equalization hole 522a. In addition, the mesh 610a should not cover the second sound emission hole 524a.

[0073] Fig. 9 is along Figure 8 Cross-section taken along midline AA. Fig. 9 , shows a structure of the first protector 500a in which the sound generated by the second speaker unit is emitted upward.

[0074] Fig.10 is along Figure 8 Cross-section taken along midline BB. Fig.10 The air path 550a is formed by the pressure equalization groove 110a (refer to Figure 7 ) is formed, and the pressure equalization groove 110a is formed by removing the outer part of the first protector 500a and the frame 100a. Through the air path 550a, air can flow between the front of the receiver and the rear of the receiver, thereby achieving pressure equalization.

[0075] Fig.11 is a diagram schematically illustrating a state in which a receiver having a pressure equalizing structure according to a third embodiment of the present disclosure is installed in an earphone housing.

[0076] The receiver having a pressure equalization structure may be installed in the earphone housing 30. Here, the side wall of the first protector 500a is attached to or fixed to the inner surface of the earphone housing 30. The sound channel 32 for emitting sound to the ear of the user is provided at the upper portion of the earphone housing 30. 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 sound of the second speaker unit is emitted upward through the second sound emission hole 524a (see Figure 8 ) is emitted upward and transmitted to the sound channel 32.

[0077] Here, air can flow between the upper and lower parts of the receiver in the housing 30 through the air path 550a between the side wall of the first protector 500a and the frame 100a, regardless of the sound, thereby achieving pressure equalization. Here, the housing 30 may include a vent 34 through which air can flow between the lower part of the receiver and the outside.

[0078] The receiver itself has a pressure equalization structure, and since the receiver is independent of the housing 30 and the pressure equalization structure is mounted on the receiver, i.e., the air path 550a, the pressure equalization structure can be fixed regardless of the shape and size of the housing 30. That is, since the housing 30 does not require a separate structure or a separate component to form the air path, an effective internal design can be performed, which brings positive effects such as reducing the defective rate and shortening the process time in production.

[0079] Fig.12 is a view illustrating a state in which a receiver having a pressure equalizing structure according to a fourth embodiment of the present disclosure is installed in an earphone housing.

[0080] The receiver with a pressure equalization structure according to the fourth embodiment of the present disclosure is installed in the upper shell 30 and the lower shell 40, and the upper shell 30 has a sound channel 32 formed therein. In addition, a bracket 30 corresponding to the shape of the receiver may be additionally provided for mounting the receiver. In the present embodiment, the first protector 500b only surrounds the upper portion of the side surface of the frame 100b, which is different from the third embodiment. Therefore, regardless of the size of the first protector 500b, the cross-section and volume of a portion not surrounded by the first protector 500b can be determined. Therefore, the size or volume of the cross-section can be increased. In addition, in Fig.12 In the fourth embodiment of the present disclosure shown in FIG. 1 , the size of the lower portion of the frame 100b that is not surrounded by the first protector 500b, that is, the portion located below the second permanent magnet, the second top plate, the second diaphragm 420b, the second guide ring 422b, and the second protector 700b, can be increased in size compared to the third embodiment. That is, since the area and volume of the diaphragm of the second speaker unit can be adjusted, there is an advantage that the acoustic characteristics can be easily adjusted when there is a pressure equalization structure.

[0081] Fig.13 is a cross-sectional view of a receiver having a pressure equalization structure according to a fifth embodiment of the present disclosure, and Fig.14 is a perspective view of a receiver having a pressure equalization structure according to a fifth embodiment of the present disclosure.

[0082] The receiver with a pressure equalization structure according to the fifth embodiment of the present disclosure includes a magnetic circuit and a vibration unit in a cylindrical frame 100c. The frame 100c includes a yoke 210c that divides the internal space of the frame 100c up and down. Based on the yoke 210c as a boundary, a first speaker unit is installed above the yoke 210c, and a second speaker unit is installed below the yoke 210c.

[0083] The yoke 210c includes 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.

[0084] The first speaker unit is installed above the yoke 210c, and the first speaker unit includes: a first permanent magnet 220c attached to the bottom surface, a first top plate 230c attached to the upper surface 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 to be spaced apart from the cylindrical portion of the yoke 210c, and the interval is a first magnetic gap. The lower end of the first voice coil 310c is positioned 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 according to the vibration of the first voice coil 310c to generate sound. The first diaphragm 410c is attached to the flange portion of the yoke 210c.

[0085] At the same time, the second speaker unit is installed below the yoke 210c. The second speaker unit includes a second permanent magnet 240c positioned 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. In this case, the second permanent magnet 240c and the second top plate 250c can be inserted into the injection during the injection molding of the frame 100c. Here, the second permanent magnet 240c and the second top plate 250c have an annular shape, and the inner periphery is installed to be spaced apart from the cylindrical portion of the yoke 210c, and the interval is the second magnetic gap. The upper end of the second voice coil 320c is positioned in the second magnetic gap, and the lower end of the second voice coil 320c is attached to the second diaphragm 420c. The outer periphery of the second diaphragm 420c is located on the lower surface of the frame 100c.

[0086] In addition, a second protector 700c for protecting the second speaker unit may be installed under the second speaker unit.

[0087] As described above, the yoke 210c includes the communication hole 212c formed by removing a portion of the flange portion. The sound generated by the second speaker unit is emitted upward through the communication hole 212c.

[0088] At the same time, the yoke 210c, the first permanent magnet 220c and the first top plate 230c are perforated in the center and act as a back hole. Therefore, the first diaphragm 410c can vibrate smoothly. In this case, the mesh portion 270c covering the perforations can be attached to the lower surface of the yoke 210c.

[0089] The first protector 500c that protects the first speaker unit and emits sound is installed on the outside of the frame 100c. 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 at the center of the upper surface 520c of the first protector 500c to emit the sound generated by the first diaphragm 410c and the second diaphragm 420c. A recess 110c is formed on the outer surface of the frame 100c to form an air path 530c with a gap with the inner surface of the first protector 500c. The recess 110c can communicate with the upper surface of the receiver, that is, the air of the upper part of the sound emission hole 522c.

[0090] Meanwhile, the air path 530c formed by the recess 110c and the first protector 500c is connected to the pressure equalization hole 514c at the lower end. The pressure equalization hole 514c is formed by a groove 512c extending to the lower end facing the recess 110c on the side wall 510c of the first protector 500c. Here, the frame 100c has a guide portion 120c inserted into the groove 512c. The upper end of the guide portion 120c is spaced apart from the upper end of the groove 512 to form the pressure equalization hole 514c defined by the groove 512c and the guide portion 120c.

[0091] The air path 530c formed by the recess 110c and the first protector 500c connects the sound emission hole 522c and the pressure equalization hole 514c on the upper surface of the first protector 500c, and since external air enters and leaves through the pressure equalization hole, the pressure difference between the pressure of the upper part of the receiver, i.e., the part inserted into the ear canal of the user and the pressure of the outside can be adjusted.

[0092] Here, the mesh 600c may be attached to the pressure equalization hole 514c to adjust the ventilation amount. By adjusting the air ventilation of the mesh 600c as needed, the acoustic characteristics may be adjusted without changing the overall structure of the receiver.

Claims

1. A receiver with a pressure equalization structure, the receiver comprising: a cylindrical frame having a gap for accommodating components; a yoke vertically partitioning an inner space of the frame, and including a bottom surface, a cylindrical portion bent from the bottom surface, a flange portion formed on an outer periphery of the cylindrical portion, and a communication hole formed by removing a portion of the flange portion; a first speaker unit, the first speaker unit being mounted above the yoke and comprising a first permanent magnet, a first plate, a first voice coil and a first diaphragm; a second speaker unit, the second speaker unit being mounted below the yoke and comprising a second permanent magnet, a second plate, a second voice coil, and a second diaphragm; a first protector coupled to an upper surface and a side surface of the frame, and comprising a sound emitting hole that protects the first speaker unit and emits sound, and a pressure equalizing hole formed by removing a portion of a lower end portion of a side wall of the first protector, wherein the frame has a guide portion inserted into a groove formed by the removed side wall, and the pressure equalizing hole is defined by the guide portion of the frame and the groove of the first protector; as well as An air path having a gap with the first protector by removing a portion of an upper surface and a portion of a side surface of the frame and extending from the sound emission hole to the pressure equalization hole.

2. The receiver according to claim 1, further comprising: A mesh portion is attached to the pressure equalization hole and adjusts the ventilation amount.

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