Earphones

Abstract

This earphone comprises: a housing 11 to which a guide tube part 15 for emitting sound to the outside is coupled; fixed poles 17 fixed to the inside of the housing 11; a vibration membrane 21 which is provided to bisect the space inside the housing 11 and vibrates in response to a potential difference generated between the facing fixed poles 17; a support member 27 which supports the vibration membrane 21 so that a portion of the vibration membrane 21 is in contact with the fixed poles 17; and an adjustment hole part 14 which is formed in the housing 11 so as to pass through a wall on a side opposite to the guide tube part 15 when viewed from the vibration membrane 21, and which is for adjusting the pressure inside the housing 11. A membrane-penetrating hole 22 which passes through the vibration membrane 21 is formed in the portion of the vibration membrane 21.

Description

[Technical field]

[0001] The present invention relates to earphones that convert electrical signals into sound. [Background technology]

[0002] The earphone has a flat fixed electrode (hereinafter also referred to as the fixed electrode) and a diaphragm arranged opposite the fixed electrode. The following Patent Document 1 discloses a capacitor-type earphone in which a thin diaphragm is arranged to divide the space inside the housing into upper and lower parts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-98957 A Summary of the Invention [Problem to be solved by the invention]

[0004] In earphones, where it is desirable to have equal pressure on both sides of the diaphragm within the housing, the pressure within the housing changes, for example, when the earphone is put on or taken off by the user. In order to adjust for such pressure changes, it has been proposed to provide pressure adjustment holes on both sides of the housing. However, providing pressure adjustment holes on both sides of the housing makes the structure of the housing complicated, and increases the manufacturing cost of the housing.

[0005] The present invention has been made in consideration of these points, and has an object to provide an earphone with a simple housing configuration that allows the internal pressure to be adjusted. [Means for solving the problem]

[0006] In one aspect of the present invention, there is provided an earphone comprising: a housing to which a conduit portion that releases sound to the outside is connected; a fixed electrode fixed within the housing; a diaphragm arranged to divide the space within the housing in two and vibrating in response to a potential difference generated between the fixed electrode and the opposing space; a support portion supporting the diaphragm so that a part of the diaphragm contacts the fixed electrode; and an adjustment hole portion formed to penetrate the wall of the housing on the opposite side to the conduit portion as viewed from the diaphragm, for adjusting the pressure within the housing, wherein a membrane through hole penetrating the diaphragm is formed in the part of the diaphragm.

[0007] The support portion may cover a side of the vibration membrane opposite to a side in contact with the fixed pole, and may be made of a breathable elastic material through which air can pass. The elastic material may be a sponge. In addition, the support portion may support the vibration membrane whose central portion is in contact with the fixed pole, the membrane through hole may be formed in the central portion of the vibration membrane, and the support portion may cover the membrane through hole.

[0008] In addition, the support portion covers the side of the vibration membrane opposite the side that contacts the fixed pole, one or more membrane through holes are formed in the vibration membrane, and a portion of the support portion facing at least one of the membrane through holes is cut out. The cutout portion may be cut out along the axial direction so that the cylindrical support portion has a U-shape when viewed in a plan view. In addition, the cutout portion may be a groove portion formed on the upper surface of the cylindrical support portion that contacts the vibration membrane, and the groove portion may be formed along the radial direction passing through the center of the support portion opposite the membrane through hole.

[0009] The support portion may be elastic and be provided between the vibration membrane and the housing so as to be deformable in response to displacement of the vibration membrane.

[0010] In addition, the housing may be composed of a first housing to which the conduit portion is connected and a second housing that encloses the space with the first housing, and the adjustment hole portion may be provided only in the second housing of the first and second housings.

[0011] In addition, a through hole may be formed in a portion of the fixed electrode with which the portion of the vibration membrane comes into contact, and the device may further include a terminal for supplying an electrical signal to the fixed electrode, which is provided on the opposite side of the vibration membrane as viewed from the fixed electrode, and a conductive member that is arranged between the fixed electrode and the terminal to cover the through hole and has breathability that allows air to pass through inside. Effect of the Invention

[0012] The present invention has the advantage of being able to realize an earphone with a simple housing configuration and adjustable internal pressure. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram illustrating the external configuration of an earphone 1 according to one embodiment. [Diagram 2] 2 is a schematic diagram for explaining the configuration of an electroacoustic transducer 10. FIG. [Diagram 3] FIG. 3 is a schematic diagram seen from the AA direction in FIG. 2. [Figure 4] 2 is a schematic diagram for explaining the configuration of a vibration membrane 21 and a support member 27. FIG. [Diagram 5] 2 is a schematic diagram for explaining the flow of air through a membrane through-hole 22 of a vibration membrane 21. FIG. [Figure 6] FIG. 13 is a schematic diagram for explaining a comparative example. [Figure 7] 13 is a schematic diagram for explaining the configuration of a support member 37 according to a modified example. FIG. [Figure 8] 13 is a schematic diagram for explaining the configuration of a support member 47 according to a modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] <Earphone Overview> An overview of an earphone according to an embodiment will be described with reference to FIG.

[0015] Fig. 1 is a schematic diagram for explaining the external configuration of an earphone 1 according to one embodiment. Here, the earphone 1 is a canal-type earphone, but is not limited to this and may be, for example, an inner-ear type earphone. As shown in Fig. 1, the earphone 1 has a cable 4, a connecting portion 5, a housing 6, and an earpiece 7.

[0016] The cable 4 is a cable for transmitting an electrical signal supplied from a sound source. The connecting portion 5 is a member that connects the cable 4 and the housing 6. The connecting portion 5 is formed of, for example, resin so as to cover the cable 4.

[0017] The housing 6 is provided between the connecting portion 5 and the earpiece 7. The housing 6 is provided with an electroacoustic converter that converts an electrical signal transmitted via the cable 4 into sound. The detailed configuration of the electroacoustic converter will be described later.

[0018] The earpiece 7 is a portion of the earphone 1 that is inserted into the user's ear. The earpiece 7 is attached to a conduit portion (specifically, the conduit portion 15 in FIG. 2) protruding from the housing 6. The earpiece 7 has an opening 7a for emitting sound generated by the electroacoustic transducer.

[0019] In the above-described earphone 1, the pressure inside the housing 6 changes when the earphone 1 is put on or taken off from the user's ear. In order to adjust such pressure changes, it is necessary to provide a pressure adjustment hole in the housing 6. In the earphone 1 of this embodiment, as will be described in detail later, by providing a membrane through-hole in the diaphragm inside the housing 6, it is possible to appropriately adjust the internal pressure with a simple housing 6 configuration.

[0020] <Detailed configuration of electroacoustic conversion section> The detailed configuration of the electroacoustic transducer will be described with reference to FIGS.

[0021] Fig. 2 is a schematic diagram for explaining the configuration of the electroacoustic transducer 10. Fig. 3 is a schematic diagram seen from the AA direction in Fig. 2. As shown in FIG. 2, the electroacoustic conversion unit 10 has a housing 11, a conduit portion 15, a fixed electrode 17, a terminal 19, a vibration membrane 21, an insulating member 23, a first conductive member 25, a support member 27, and a second conductive member 29.

[0022] The housing 11 forms the casing of the electroacoustic transducer unit 10, and has an internal space in which the fixed pole 17, the diaphragm 21, etc. are disposed. The housing 11 corresponds to the housing 6 shown in FIG. 1. The housing 11 is made of resin here. As shown in FIG. 2, the housing 11 is composed of an ear-side housing 12 and an outer housing 13. The outer housing 13 and the ear-side housing 12 surround the internal space.

[0023] The ear-side housing 12 is a part that is located on the ear side when the earphone 1 is worn in the user's ear. The outer housing 13 is a part that is located on the side that is farther from the ear when the earphone 1 is worn in the user's ear. In this embodiment, the ear-side housing 12 corresponds to the first housing, and the outer housing 13 corresponds to the second housing.

[0024] An adjustment hole 14 for adjusting the pressure inside the housing 11 is formed in the outer housing 13. As shown in FIG. 2, the adjustment hole 14 is formed to penetrate the outer housing 13, which is a wall of the housing 11 on the opposite side to the conduit portion 15 when viewed from the vibration membrane 21. The adjustment hole 14 is formed to protrude from the outer housing 13 toward the internal space, and no protrusions or the like are formed on the outer peripheral surface of the outer housing 13. In this embodiment, the adjustment hole 14 is provided only in the outer housing 13 out of the ear-side housing 12 and the outer housing 13. This also simplifies the configuration of the ear-side housing 12.

[0025] The conduit portion 15 functions as a conduit for releasing sound to the outside. As shown in Fig. 2, the conduit portion 15 is connected to the ear-side housing 12 of the housing 11. Specifically, the conduit portion 15 is formed so as to protrude from the ear-side housing 12. The tip of the conduit portion 15 is detachably attached to the earpiece 7 (Fig. 1).

[0026] The fixed pole 17 is formed of a flat conductive member (e.g., aluminum). The fixed pole 17 is fixed inside the housing 11. When a bias voltage is applied to the fixed pole 17 via, for example, a terminal 19, an electric field is generated between the fixed pole 17 and the vibration membrane 21. Furthermore, an electric signal input from a sound source is input to the fixed pole 17 and the vibration membrane 21 via the terminal 19 and the first conductive member 25, respectively.

[0027] A plurality of through holes 17a are formed in the fixed electrode 17. The plurality of through holes 17a are formed at a predetermined interval as shown in Fig. 3. A through hole 18 is formed in a portion of the fixed electrode 17 that comes into contact with the center of the vibration membrane 21 (specifically, a portion sandwiched between the center of the vibration membrane 21 and the second conductive member 29) as shown in Fig. 2. The diameter of the through hole 18 is larger than the diameter of the through hole 17a in this embodiment.

[0028] Terminal 19 is a conductive terminal for supplying an electric signal to fixed electrode 17. Terminal 19 is electrically coupled to fixed electrode 17, and receives an electric signal, for example, superimposed on a bias voltage and supplied from a sound source. Terminal 19 is provided on the opposite side of fixed electrode 17 to diaphragm 21.

[0029] The diaphragm 21 is disposed opposite the fixed electrode 17 and is a diaphragm that vibrates based on an electric signal supplied from a sound source. The diaphragm 21 is formed of a thin film having electrical conductivity. The diaphragm 21 is formed of, for example, a metal foil or a polymer film on which gold is vapor-deposited. The diaphragm 21 is disposed so as to divide the space within the housing 11 into two. Specifically, the space within the housing 11 is divided into a lower region R1 below the diaphragm 21 and an upper region R2 above the diaphragm 21, as shown in FIG. 2.

[0030] The diaphragm 21 vibrates in response to a potential difference between the terminal 19 and the first conductive member 25 caused by an electrical signal. Specifically, the diaphragm 21 vibrates in response to a potential difference generated between the terminal 19 and the fixed electrode 17 based on an electrical signal applied to the terminal 19 and the first conductive member 25. More specifically, the diaphragm 21 vibrates in response to a change in the magnitude of the AC component of the potential difference generated between the terminal 19 and the first conductive member 25.

[0031] Fig. 4 is a schematic diagram for explaining the configuration of the vibrating membrane 21 and the support member 27. Fig. 4 shows the vibrating membrane 21 as viewed from the lower surface 21b side. The vibrating membrane 21 has a membrane through-hole 22 formed therein, penetrating the membrane. Here, one membrane through-hole 22 is formed in the center of the vibrating membrane 21. Here, the diameter of the membrane through-hole 22 is 0.1 mm or less in the vibrating membrane 21 having a thickness of 2 µm. The amount of air passing through the membrane through-hole 22 is adjusted depending on the diameter of the membrane through-hole 22.

[0032] Here, the membrane through hole 22 is formed by instantaneously melting the diaphragm 21 with heat from a laser to open a hole. In this case, the periphery of the hole is melted and reinforced with heat, making it easier to adjust the size of the membrane through hole 22 and preventing the diaphragm 21 from breaking or being damaged due to the load caused by the pressure change when the earphone 1 is inserted into or removed from the ear.

[0033] In the above, one membrane through hole 22 is formed in the center of the vibration membrane 21, but the present invention is not limited thereto, and for example, a plurality of membrane through holes 22 may be formed. The number and diameter of the membrane through holes 22 may be appropriately selected in consideration of the air flow rate, acoustic design, and manufacturing method. In addition, in the above, a circular membrane through hole 22 is formed using a gas laser, but the present invention is not limited thereto, and for example, an elliptical membrane through hole 22 may be formed using a semiconductor laser. In this way, the membrane through hole 22 may have various shapes.

[0034] The insulating member 23 is provided to ensure a space for the vibration membrane 21 to vibrate, and is made of, for example, resin. The insulating member 23 has, for example, an annular shape, and is sandwiched between the peripheral portion of the vibration membrane 21 and the fixed pole 17 as shown in Fig. 2. As a result, the peripheral portion of the vibration membrane 21 is fixed without contacting the fixed pole 17, and the region of the vibration membrane 21 that is not in contact with the insulating member 23 (region excluding the center portion of the vibration membrane 21) vibrates in response to an electric signal.

[0035] The first conductive member 25 is a member for applying an electric signal to the vibration membrane 21. The first conductive member 25 is formed of, for example, a conductive sheet. As shown in FIG. 2, the first conductive member 25 has an annular portion 25a that contacts the peripheral portion of the vibration membrane 21 and an extension portion 25b that extends upward from at least a part of the annular portion 25a. The extension portion 25b actually extends to the connecting portion 5.

[0036] The support member 27 is a support part that supports the diaphragm 21 so that a part of the diaphragm 21 contacts the fixed pole 17. As shown in FIG. 2, the support member 27 is located on the lower surface 21b side of the diaphragm 21 and contacts the lower surface 21b of the diaphragm 21 to support the diaphragm 21. The support member 27 covers the side opposite to the side that contacts the fixed pole 17 in the center portion, which is a part of the diaphragm 21. The support member 27 supports the lower surface 21b of the diaphragm 21, so that the center portion of the upper surface 21a of the diaphragm 21 is pressed against the fixed pole 17.

[0037] The support member 27 is disposed between the diaphragm 21 and the ear-side housing 12 of the housing 11 so as to be in contact with the lower surface 21b of the diaphragm 21 and the ear-side housing 12. The support member 27 is made of an elastic material having elasticity, and is provided so as to be deformable in accordance with the displacement of the diaphragm 21. For example, when the user removes the earphone 1 from the ear, the inside of the housing 11 is depressurized and the diaphragm 21 is displaced, and the support member 27 is deformed in accordance with the displacement of the diaphragm 21.

[0038] As shown in Fig. 4, the support member 27 covers the membrane through hole 22. The support member 27 is made of a breathable elastic material through which air can pass. Here, the elastic material is, for example, a sponge. Since the support member 27 has breathability in this way, for example, air that has passed through the membrane through hole 22 of the vibration membrane 21 can pass through the support member 27 in contact with the membrane through hole 22.

[0039] 2, the second conductive member 29 is disposed so as to be sandwiched between the fixed pole 17 and the terminal 19. The second conductive member 29 is disposed so as to cover the through hole 18 of the fixed pole 17. The second conductive member 29 has a function of becoming an acoustic resistor between the fixed pole 17 and the terminal 19, thereby making it possible to adjust the acoustic characteristics. In particular, by using both the first conductive member 25 and the second conductive member 29 described above, it becomes possible to adjust a wide range of acoustic characteristics.

[0040] The second conductive member 29 has air permeability that allows air to pass through the inside. For example, the second conductive member 29 is formed of a conductive cloth. Since the second conductive member 29 has air permeability in this way, the air in the lower region R1 passes through the membrane through-hole 22 of the vibration membrane 21 and the second conductive member 29 in this order, and easily flows to the upper region R2. Similarly, the air in the upper region R2 also passes through the second conductive member 29 and the membrane through-hole 22 in this order, and easily flows to the lower region R1.

[0041] <Air flow through membrane through hole 22> In this embodiment, the membrane through-hole 22 is provided in the vibration membrane 21, so that the air in the housing 11 flows through the membrane through-hole 22, and the pressure in the housing 11 is adjusted.

[0042] For example, when the pressure in the lower region R1 increases as the earphone 1 is placed in the user's ear, the air in the lower region R1 flows through the membrane through hole 22 and out of the housing 11 from the adjustment hole portion 14, thereby decreasing the pressure in the lower region R1 and balancing the pressure in the lower region R1 and the upper region R2. The above-mentioned air flow will be described with reference to FIG. 5.

[0043] FIG. 5 is a schematic diagram for explaining the flow of air through the membrane through hole 22 of the vibration membrane 21. In FIG. 5, the flow of air is indicated by dashed arrows. The air in the lower region R1 first flows toward the support member 27. Since the support member 27 is breathable, the air that reaches the support member 27 passes through the inside of the support member 27. Then, the air passes through the membrane through hole 22 with which the support member 27 of the vibration membrane 21 is in contact. The air that passes through the membrane through hole 22 passes through the through hole 18 of the fixed pole 17 toward the second conductive member 29. Since the second conductive member 29 is breathable, the air that reaches the second conductive member 29 passes through the second conductive member 29. Then, the air flows through the upper region R2 toward the adjustment hole portion 14 of the outer housing 13. Then, the air passes through the adjustment hole portion 14 and is discharged to the outside of the housing 11 (see FIG. 2).

[0044] Furthermore, when the pressure in the upper region R2 is high, a flow opposite to the flow described above occurs (i.e., the air in the upper region R2 flows outside the housing 11 via the membrane-penetrating hole 22 and the conduit section 15), and the air is discharged outside the housing 11 from the adjustment hole section 14, thereby balancing the pressure in the lower region R1 and the upper region R2.

[0045] When a membrane through hole 22 is provided in the center of the vibration membrane 21 (the portion supported by the support member 27), a path for air flow can be formed by utilizing the non-vibrating center of the vibration membrane 21. Furthermore, by providing the membrane through hole 22 in the vibration membrane 21 that divides the inside of the housing 11 into a lower region R1 and an upper region R2, the configuration of the housing 11 becomes simpler than that of the comparative example shown in Fig. 6. The effectiveness of this embodiment will be further described below in comparison with the comparative example.

[0046] 6 is a schematic diagram for explaining a comparative example. Unlike the above-mentioned diaphragm 21, the diaphragm 121 of the electroacoustic converter 110 according to the comparative example does not have a membrane through-hole. Therefore, in the comparative example, in addition to the adjustment hole 14 for allowing the air in the upper region R2 to flow out of the housing, the ear-side housing 112 is provided with an adjustment flow passage 130 for allowing the air in the lower region R1 to flow out of the housing. Also, the support member 127 and the second conductive member 129 differ from the support member 27 and the second conductive member 29 in that they are not breathable.

[0047] The adjustment flow path section 130 is a flow path through which air flows. For example, when adjusting the pressure of the lower region R1, the air in the lower region R1 flows outside the housing 11 through the adjustment flow path section 130. From the viewpoint of preventing the air flowing through the adjustment flow path section 130 from heading toward the user's ear, the adjustment flow path section 130 is formed long and thin along the outer surface of the ear-side housing 112 as shown in FIG. 6. In particular, in order to reduce the influence on the acoustic characteristics, the diameter of the adjustment flow path section 130 is made small and the flow path length of the adjustment flow path section 130 is made long. In order to form such an adjustment flow path section 130, the structure of the ear-side housing 112 becomes complicated, and the manufacturing cost of the ear-side housing 112 becomes high. For example, the diameter of the adjustment flow path section 130 is preferably about 0.1 mm, but in this case, a precise mold is required and the mold must be assembled with great care. In contrast, in the case of this embodiment, the adjustment flow path section 130 is not provided in the ear-side housing 12, and the air in the lower region R1 flows outside the housing 11 through the membrane through-hole 22. This simplifies the structure of the ear-side housing 12.

[0048] <Modification> Fig. 7 is a schematic diagram for explaining the configuration of a support member 37 according to a modified example. In Fig. 7, the relationship between the membrane through-hole 22 of the vibration membrane 21 and the support member 37 is shown.

[0049] The support member 27 in the above-described embodiment is arranged so as to cover the entire membrane through hole 22 of the vibration membrane 21 (see FIG. 4). In contrast to this, in the modified example, as shown in FIG. 7, a cutout portion 38 is formed in a portion of a cylindrical support member 37 facing the membrane through hole 22, so that the membrane through hole 22 is exposed. That is, the cutout portion 38 is cut out along the axial direction so as to have a U-shape when the support member 37 is viewed in a plan view. In the case of such a support member 37, the air permeability to the membrane through hole 22 is good, and the selection of the material of the support member 37 is broadened. For example, even if the support member 37 is changed to another material, the influence of the air permeability is small.

[0050] By providing the cutout portion 38 in the support member 37, for example, air in the lower region R1 is more likely to reach the membrane through-hole 22 through the cutout portion 38. That is, in the modified example, air is more likely to reach the membrane through-hole 22 without passing through the support member 37. For this reason, the support member 37 does not need to be made of a breathable material. However, without being limited thereto, the support member 37 may be made of a breathable material.

[0051] 7, for example, a hole (the diameter of the hole is larger than the diameter of the membrane through hole 22) may be formed penetrating the center of the cylindrical support member 37 along the axial direction. In the case of the support member 37 having such a shape, the membrane through hole 22 does not abut against the support member 37, so that it is possible to suppress the occurrence of variations in breathability caused by the small membrane through hole 22 being blocked more than expected due to, for example, individual differences in the support member 37 or differences in the pressing strength against the vibration membrane 21.

[0052] In Figure 7, only one membrane through hole 22 is shown, but there may be multiple membrane through holes 22, in which case the cutout portion 38 of the support member 37 is formed to face at least one of the multiple membrane through holes 22 (for example, two of the five membrane through holes 22).

[0053] FIG. 8 is a schematic diagram for explaining the configuration of a support member 47 according to a modified example. FIG. 8(a) shows a plan view of the support member 47, and FIG. 8(b) shows a BB cross-sectional view of FIG. 8(a). In the support member 47, a groove portion 48 is formed as a cutout portion on an upper surface 47a that contacts the lower surface 21b (see FIG. 2) of the vibration membrane 21. The groove portion 48 is formed linearly along the radial direction passing through the center of the support member 47 on the upper surface 47a of the cylindrical support member 47. The groove portion 48 is also formed at a position facing the membrane through hole 22. For this reason, air in the lower region R1 is likely to reach the membrane through hole 22 through the groove portion 48 (see FIG. 5). By providing the groove portion 48 in the support member 47, the ventilation to the membrane through hole 22 is good, as in the support member 37 shown in FIG. 7, and the selection of the material of the support member 47 is expanded.

[0054] In the case of the modified example, too, a flow of air within the housing 11 occurs via the membrane through-holes 22. For example, air in the lower region R1 flows to the outside of the housing 11 via the membrane through-holes 22.

[0055] <Effects of this embodiment> The earphone 1 of the embodiment described above has a diaphragm 21 provided to divide the space inside the housing 11 into two, a support member 27 supporting the diaphragm 21 so that the center of the diaphragm 21 contacts the fixed pole 17, and an adjustment hole portion 14 formed in the outer housing 13 for adjusting the pressure inside the housing 11. A membrane through hole 22 penetrating the diaphragm 21 is formed in the center of the diaphragm 21. This provides a membrane through hole 22 in the center of the diaphragm 21 (the portion supported by the support member 27), and makes it possible to form a path for air flow by utilizing the non-vibrating center of the diaphragm 21. Also, by providing the membrane through hole 22 in the diaphragm 21 that divides the inside of the housing 11 into a lower region R1 and an upper region R2, for example, air in the lower region R1 flows from the adjustment hole portion 14 of the outer housing 13 to the outside of the housing 11, adjusting the pressure inside the housing 11, and thus the configuration of the ear-side housing 12 can be simplified.

[0056] Also, by providing the membrane through hole 22, it is no longer necessary to provide an adjustment flow path section (for example, the adjustment flow path section 130 shown in FIG. 6) in the ear-side housing 12. This also makes it unnecessary to adjust the diameter or flow path length of the adjustment flow path section of the housing 11, facilitating the design for the inflow and outflow of air within the housing 11. Also, since it is no longer necessary to provide an adjustment flow path section, it is possible to further reduce the size of the earphone 1 without compromising sound quality. Furthermore, since it is no longer necessary to adjust the diameter or flow path length of the adjustment flow path section, parameters that affect acoustic characteristics (making it difficult to output low frequency ranges) are reduced, and acoustic design is also made easier.

[0057] Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. For example, all or part of the device can be configured by distributing or integrating functionally or physically in any unit. In addition, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment resulting from the combination combines the effect of the original embodiment. [Explanation of symbols]

[0058] 1. Earphones 11. Housing 12 Ear housing 13 Outer housing 14 Adjustment hole 17 fixed pole 19 Terminals 21 Vibrating membrane 22 Membrane through hole 27 Support member 29 Second conductive member 37 Support member 47 Support member

Claims

1. A housing connected to a conduit for emitting sound to the outside; a fixed pole fixed within the housing; a vibration membrane provided so as to divide a space within the housing into two, the vibration membrane vibrating in response to a potential difference generated between the fixed pole and the opposing pole; a support portion supporting the vibration membrane such that a portion of the vibration membrane is in contact with the fixed pole; an adjustment hole portion formed to penetrate a wall of the housing on an opposite side to the conduit portion as viewed from the vibration membrane, for adjusting a pressure inside the housing; Equipped with a membrane through hole penetrating the vibration membrane is formed in the portion of the vibration membrane, the support portion covers a side of the vibration membrane opposite to a side in contact with the fixed electrode, and is made of an elastic material having air permeability through which air can pass. Earphones.

2. The elastic material is a sponge. The earphone according to claim 1 .

3. A housing connected to a conduit portion that releases sound to the outside; a fixed pole fixed within the housing; a vibration membrane provided so as to divide a space within the housing into two, the vibration membrane vibrating in response to a potential difference generated between the fixed pole and the opposing pole; a support portion supporting the vibration membrane such that a portion of the vibration membrane is in contact with the fixed pole; an adjustment hole portion formed to penetrate a wall of the housing on an opposite side to the conduit portion as viewed from the vibration membrane, for adjusting a pressure inside the housing; Equipped with a membrane through hole penetrating the vibration membrane is formed in the portion of the vibration membrane, the support portion supports the vibration membrane, the central portion of which is in contact with the fixed pole; the membrane through-hole is formed in the central portion of the vibration membrane, The support portion covers the membrane through hole. Earphones.

4. A housing connected to a conduit portion that releases sound to the outside; a fixed pole fixed within the housing; a vibration membrane provided so as to divide a space within the housing into two, the vibration membrane vibrating in response to a potential difference generated between the fixed pole and the opposing pole; a support portion supporting the vibration membrane such that a portion of the vibration membrane is in contact with the fixed pole; an adjustment hole portion formed to penetrate a wall of the housing on an opposite side to the conduit portion as viewed from the vibration membrane, for adjusting a pressure inside the housing; Equipped with a membrane through hole penetrating the vibration membrane is formed in the portion of the vibration membrane, the support portion covers a side of the portion of the vibration membrane opposite to a side in contact with the fixed pole, The membrane through-hole is formed in one or more of the vibration membrane, A portion of the support portion facing at least one of the membrane through holes is a notch portion. Earphones.

5. The cutout portion is cut out along the axial direction so as to have a U-shape when the cylindrical support portion is viewed in a plan view. The earphone according to claim 4.

6. the notch portion is a groove portion formed in an upper surface of the cylindrical support portion that is in contact with the vibration membrane, The groove portion is formed along a radial direction passing through a center of the support portion facing the membrane through hole. The earphone according to claim 4.

7. The support portion has elasticity and is provided between the vibration membrane and the housing so as to be deformable in accordance with the displacement of the vibration membrane. The earphone according to claim 1 .

8. the housing includes a first housing to which the conduit portion is connected and a second housing that encloses the space with the first housing, The adjustment hole portion is provided only in the second housing out of the first housing and the second housing. The earphone according to claim 1 .

9. A housing to which a conduit portion for emitting sound to the outside is connected, a fixed pole fixed within the housing; a vibration membrane provided so as to divide a space within the housing into two, the vibration membrane vibrating in response to a potential difference generated between the fixed pole and the opposing pole; a support portion supporting the vibration membrane such that a portion of the vibration membrane is in contact with the fixed pole; an adjustment hole portion formed to penetrate a wall of the housing on an opposite side to the conduit portion as viewed from the vibration membrane, for adjusting a pressure inside the housing; Equipped with a membrane through hole penetrating the vibration membrane is formed in the portion of the vibration membrane, a through hole is formed in a portion of the fixed pole with which the portion of the vibration membrane comes into contact, a terminal provided on an opposite side of the fixed electrode from the vibration membrane, for supplying an electrical signal to the fixed electrode; a conductive member that is provided between the fixed electrode and the terminal so as to cover the through hole and has air permeability through which air can pass; Further comprising: Earphones.

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