JP2004087185A - Multipolar earphone plug connection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multipolar earphone plug connection device with high reliability having a stable waterproofing property and a connection property even when a multipolar earphone plug is used. <P>SOLUTION: The multipolar earphone plug connection device comprises a multipolar earphone plug 7 having a cylindrical terminal 10 at the outer periphery of the base of a plug terminal 9 projecting from the end surface 8a of a body 8, and a plug insertion part 3 mounted to an opening 4 of a cabinet 1 to which the earphone plug is connected. A ring-shaped convex part 21 contacting with the outside of a ring-shaped convex part 22 of the earphone plug is formed at the opening 4 of the cabinet 1. A stable waterproofing property and a connection property are obtained by fitting the ring-shaped convex part 21 to the ring-shaped convex part 22. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multipolar earphone plug connection device used for an electronic device housing.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, earphone plug connection devices used for electronic devices are mostly of two polarities, and an earphone jack is exposed from an opening of a housing because an earphone plug is inserted therein, so that waterproofing is provided. Needed. Such a waterproof structure is described in, for example, Japanese Patent No. 2507173. As shown in FIG. 11, a plug insertion portion 105 of an earphone jack 104 for attaching and detaching an earphone plug 103 is inserted into a concave portion 102 formed in a housing 101, and the plug insertion portion 105 is inserted from outside the plug insertion portion 105. The nut member 106 is screwed together, the plug insertion portion 105 is fixed to the housing 101, the seal cap 107 is pressed into the recess 102, and the seal cap 107 is placed over the nut member 106 in a watertight state. . With such a waterproof structure, even with a conventional bipolar earphone plug connection device, it is possible to prevent water or dust from entering through the opening of the housing.
[0003]
[Problems to be solved by the invention]
However, the conventional bipolar earphone plug connection device as described above can provide a waterproof function, but the multipolar earphone plug connection device developed with diversification of connection options can provide a sufficient waterproof function. There was no problem. Multipolar earphone plugs are larger than two-polar earphone plugs, so if a waterproof structure is adopted, the design will deteriorate, and the waterproofing function will decrease due to a reduction in the compression of the seal part due to the larger earphone jack insertion hole. descend. If the compression margin is increased, the repulsive force when the earphone plug is unplugged must be increased accordingly, and there is a problem of reliability in that the earphone plug is easily pulled out during use. Also, since the contact portion of the multipolar earphone jack is located at the upper end of the earphone jack, a gap is formed between the opening of the housing and the earphone jack, and it is easy to guide through the opening of the housing. In addition, there is also a problem that a crack or the like occurs at a joint between the earphone jack and the circuit board due to vibration or bending of the earphone plug, thereby lowering reliability.
[0004]
The present invention solves such a conventional problem.Stable waterproofness can be obtained even when a multipolar earphone plug is used, and stable connection can be ensured even when there is vibration or bending. It is an object of the present invention to provide a highly reliable multipolar earphone plug connection device.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, a multipolar earphone plug connection device according to the present invention includes a multipolar earphone plug having a cylindrical terminal on the outer periphery of a base of a plug terminal protruding from an earphone plug main body, and a multipolar earphone plug attached to an opening of a housing. A multi-polar earphone plug connection device comprising: an earphone jack to which the earphone plug is connected, wherein the earphone plug body includes an annular convex portion around the cylindrical terminal, and An earphone plug main body is provided with an opposed annular convex portion inside the annular convex portion. With this configuration, stable waterproofness can be obtained while considering design, and a highly reliable multipolar earphone plug connection device can be realized.
[0006]
Also, the multipolar earphone plug connection device of the present invention includes a multipolar earphone plug having a cylindrical terminal on the outer periphery of a base of a plug terminal protruding from the earphone plug main body, and the earphone plug attached to an opening of a housing. A multipolar earphone plug connection device comprising: an earphone jack to which the earphone plug is connected; an annular protrusion around the cylindrical terminal of the earphone plug main body; and an opening of the earphone plug main body in the opening of the housing. An annular projection is provided which comes into contact with the outside of the annular projection. With this configuration, a stable connection can be ensured even in the presence of vibration or bending, while considering the design, and a highly reliable multipolar earphone plug connection device can be realized.
[0007]
Also, the multipolar earphone plug connection device of the present invention includes a multipolar earphone plug having a cylindrical terminal on the outer periphery of a base of a plug terminal protruding from the earphone plug main body, and the earphone plug attached to an opening of a housing. A multipolar earphone plug connection device having an earphone jack to which a first annular convex portion and a second annular convex portion are provided around the cylindrical terminal of the earphone plug body. The opening is provided with an annular projection facing the inside of the first annular projection of the earphone plug main body and the opening contacting the outside of the second annular projection. is there. With this configuration, stable waterproofness can be obtained while considering design, and stable connection can be ensured even when there is vibration or bending, and a highly reliable multipolar earphone plug connection device can be realized. it can.
[0008]
Also, the multipolar earphone plug connection device of the present invention includes a multipolar earphone plug having a cylindrical terminal on the outer periphery of a base of a plug terminal protruding from the earphone plug main body, and the earphone plug attached to an opening of a housing. A multi-polar earphone plug connection device comprising: an earphone jack to which the earphone plug is connected; and a seal ring in contact with the main body portion and the cylindrical terminal of the earphone plug in the opening of the housing. is there. With this configuration, stable waterproofness can be obtained while considering design, and stable connection can be ensured even when there is vibration or bending, and a highly reliable multipolar earphone plug connection device can be realized. it can.
[0009]
Further, the multipolar earphone plug connection device of the present invention is characterized in that the seal ring is formed integrally with an earphone jack cover that closes the earphone jack from outside when the earphone plug is removed from the earphone jack. With this configuration, it is possible to ensure waterproofness when not in use, and it is possible to secure a function as a waterproof for living even if it is accidentally wetted or submerged in water.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1A shows a configuration of a multipolar earphone plug connection device according to Embodiment 1 of the present invention, and FIG. 1B is a partially enlarged view of the earphone plug viewed from below. FIG. 2A is a cross-sectional view showing a state in which an earphone plug is inserted into an earphone jack, and FIG. 2B is an enlarged cross-sectional view of a portion A in FIG. 2A. 1 and 2, an opening 4 for exposing the plug insertion portion 3 of the earphone jack 2 is formed on the upper surface of the housing 1. The earphone jack 2 has four feet 2 a fixed to a printed circuit board 5 inside the housing 1 by soldering. On the periphery of the opening 4, an annular convex portion 6 is formed upward. On the other hand, the earphone plug 7 includes a main body 8 made of an insulating material such as resin, rubber, and elastic resin, a monaural or stereo plug terminal 9 protruding from the center of an end face 8 a of the main body 8, and a plug terminal 9. And a cylindrical terminal 10 provided concentrically around the periphery of the body 9 and insulated by the main body 8. Further, an annular convex portion 11 is formed on the end surface 8a of the main body 8 downward from the outer peripheral surface thereof. The annular projection 6 of the opening 4 and the annular projection 11 of the earphone plug 7 have the same height, but the diameter of the annular projection 11 of the earphone plug 7 is the same as the diameter of the annular projection 6 of the opening 4. And a gap G is provided between them. Further, an earphone jack cover 12 for preventing external water or dust from entering the inside of the housing 1 from the opening 4 when the earphone plug 7 is not attached is fixed to the upper surface of the housing 1. . The material of the earphone jack cover 12 includes rubber, elastomer, and the like. Silicon rubber is particularly preferable in terms of migration and flexibility.
[0011]
Next, the operation of the earphone plug connection device according to the first embodiment will be described. When the plug terminal 9 of the earphone plug 7 is pushed and inserted into the insertion hole 3a of the plug insertion portion 3 of the earphone jack 2, the plug terminal 9 is connected to the electrode of the insertion hole 3a, and the cylindrical terminal 10 is connected to the plug insertion portion 3 And is connected to the electrode of the cylindrical portion 3b. Each electrode of the plug insertion section 3 is connected to the printed circuit board 5 by a conductive section (not shown). When the earphone plug 7 is inserted into the earphone jack 2, the annular projection 11 of the earphone plug 7 faces the outer periphery of the annular projection 6 of the opening 4 with a gap G. The gap G absorbs variations in the center positions of the annular protrusions 6 and 11 concentric with the plug terminal 9 and the cylindrical terminal 10. In addition, the staggered structure of the annular convex portion 6 and the annular convex portion 11 can prevent external water and dust from entering the housing 1 through the opening 4. It is preferable that the diameters of the annular protrusion 6 and the annular protrusion 11 are as large as possible from the viewpoint of waterproof performance. In addition, when the plug is inserted, the annular projection 6 of the opening 4 can be blinded by the annular projection 11 of the earphone plug 7, which is excellent in design. When the earphone plug 7 is not used, the earphone jack cover 12 is inserted into the earphone jack 2 to close the opening 4.
[0012]
As described above, according to the first embodiment, on the periphery of the opening 4 of the housing 1, there is provided the annular convex portion 6 facing the inside of the annular convex portion 11 formed on the main body 8 of the earphone plug 7. Therefore, when the earphone plug 7 is inserted into the earphone jack 2, the staggered structure of the annular convex portion 6 and the annular convex portion 11 provides stable waterproofness and realizes a highly reliable multipolar earphone plug connection device. can do.
[0013]
(Embodiment 2)
Next, a second embodiment of the present invention will be described. FIG. 3 shows a configuration of a multipolar earphone plug connection device according to Embodiment 2 of the present invention. FIG. 4 (a) is a cross-sectional view showing a state where an earphone plug is inserted into an earphone jack, and FIG. 4 (b) is FIG. It is an A section expanded sectional view of (a). The second embodiment differs from the first embodiment shown in FIGS. 1 and 2 only in the waterproof structure of the earphone plug and the earphone jack. Only the different parts will be described.
[0014]
3 and 4, an annular projection 21 is formed upward on the periphery of the opening 4 of the housing 1, and an annular projection 21a is formed on the upper surface thereof toward the inner peripheral side. On the end face 8a of the main body portion 8 of the earphone plug 7, an annular convex portion 22 having a higher side on the cylindrical terminal 10 and a lower outer peripheral side is formed. The annular projection 21 of the opening 4 and the annular projection 22 of the earphone plug 7 have the same height, and the outer diameter of the annular projection 22 of the earphone plug 7 is the same as that of the annular projection 21 of the opening 4. It is almost the same as or slightly larger than the inner diameter of the protrusion 21a.
[0015]
Next, the operation of the earphone plug connection device according to the second embodiment will be described. When the plug terminal 9 of the earphone plug 7 is pushed and inserted into the insertion hole 3a of the plug insertion portion 3 of the earphone jack 2, the plug terminal 9 is connected to the electrode of the insertion hole 3a, and the cylindrical terminal 10 is connected to the plug insertion portion 3 And is connected to the electrode of the cylindrical portion 3b. At the same time, the annular projection 22 of the earphone plug 7 is pressed into the annular projection 21 a of the annular projection 21 of the opening 4. The pressure contact between the annular protrusion 22 and the annular protrusion 21 a can prevent external water and dust from entering the housing 1 through the opening 4. Further, even if the user attempts to move the main body 8 of the earphone plug 7 in a horizontal plane, the movement is prevented by the press-contact between the annular projection 22 and the annular projection 21a, so that the printed board 5 and the foot 2a of the earphone jack 2 are not moved. No stress is applied to the solder joint, and breakage is prevented. It is preferable that the diameters of the annular projection 26 and the annular projection 21a are as large as possible from the viewpoint of waterproof performance. In addition, when the plug is inserted, the annular convex portion 21 of the opening 4 can be hidden by the annular convex portion 22 of the earphone plug 7, which is excellent in design. When the earphone plug 7 is not used, the earphone jack cover 12 is inserted into the earphone jack 2 to close the opening 4.
[0016]
As described above, according to the second embodiment, the annular convex portion 21 that contacts the outside of the annular convex portion 22 formed on the end surface 8a of the main body 8 of the earphone plug 7 around the opening 4 of the housing 1. When the earphone plug 7 is inserted into the earphone jack 2, stable waterproofness is obtained by fitting the annular convex portion 22 and the annular convex portion 21, and vibration and bending of the earphone plug 7 are obtained. Since the force due to is absorbed or prevented, rattling can be prevented. Thereby, no unreasonable force is applied to the joint between the foot 2a of the earphone jack 2 and the printed circuit board 5, and a highly reliable multipolar earphone plug connection device can be realized.
[0017]
(Embodiment 3)
Next, a third embodiment of the present invention will be described. FIG. 5 shows a configuration of a multipolar earphone plug connection device according to Embodiment 3 of the present invention. FIG. 6 (a) is a cross-sectional view showing a state where an earphone plug is inserted into an earphone jack, and FIG. 6 (b) is FIG. It is an A section expanded sectional view of (a). The third embodiment is a combination of the first embodiment shown in FIGS. 1 and 2 and the second embodiment shown in FIGS. 3 and 4, and the same components are denoted by the same reference numerals. In addition, only different portions will be described below.
[0018]
In FIGS. 5 and 6, an annular convex portion 31 is formed upward on the periphery of the opening 4 of the housing 1. In addition, a first annular convex portion 32 is formed on the end face 8a of the main body portion of the earphone plug 7 downward from the outer peripheral surface thereof. The annular projection 31 of the opening 4 and the annular projection 32 of the earphone plug 7 have the same height, but the diameter of the annular projection 32 of the earphone plug 7 is the same as the diameter of the annular projection 31 of the opening 4. And a gap G is provided between them. Further, a second annular convex portion 33 having a high portion in contact with the cylindrical terminal 10 and a low outer peripheral side is formed on the end surface 8a of the main body portion of the earphone plug 7, and the outer peripheral portion has an annular convex portion projecting radially outward. The protrusion 33a is formed. The outer diameter of the annular protrusion 33 a is slightly larger than the inner diameter of the opening 4.
[0019]
Next, the operation of the earphone plug connection device according to the third embodiment will be described. When the plug terminal 9 of the earphone plug 7 is pushed and inserted into the insertion hole 3a of the plug insertion portion 3 of the earphone jack 2, the plug terminal 9 is connected to the electrode of the insertion hole 3a, and the cylindrical terminal 10 is connected to the plug insertion portion 3 And is connected to the electrode of the cylindrical portion 3b. When the earphone plug 7 is inserted into the earphone jack 2, the first annular projection 32 of the earphone plug 7 is positioned with a gap G around the outer periphery of the annular projection 31 of the opening 4. The staggered structure of the first annular projection 32 and the annular projection 31 can prevent external water and dust from entering the housing 1 through the opening 4. At the same time, the annular projection 33 a of the second annular projection 33 of the earphone plug 7 is pressed into the inner periphery of the opening 4. The pressure contact between the annular projection 33a of the second annular projection 33 and the inner periphery of the opening 4 can prevent external water and dust from entering the housing 1 through the opening 4, and also provide an earphone plug. When the main body 8 of the head 7 is moved in a horizontal plane, the movement is prevented by the pressure contact between the second annular projection 33 and the opening 4, so that the printed board 5 and the foot 2 a of the earphone jack 2 are soldered. No stress is applied to the part and breakage is prevented. It is preferable that the diameters of the first annular convex portion 32 and the annular convex portion 31 be as large as possible from the viewpoint of waterproof performance. Further, when the plug is inserted, the annular convex portion 31 of the opening 4 can be blinded by the first annular convex portion 32 of the earphone plug 7, which is excellent in design. When the earphone plug 7 is not used, the earphone jack cover 12 is inserted into the earphone jack 2 to close the opening 4.
[0020]
As described above, according to the third embodiment, the annular convex portion facing the inside of the first annular convex portion 32 formed on the end surface 8a of the main body portion of the earphone plug 7 around the opening 4 of the housing 1. When the earphone plug 7 is inserted into the earphone jack 2, the second annular protrusion 33 is formed inside the first annular protrusion 32 on the body end face 8 a of the earphone plug 7. Since the first annular projection 32 of the earphone plug 7 and the annular projection 31 of the opening 4 face each other, the annular projection 33a of the second annular projection 33 of the earphone plug 7 and the opening By contacting the inner periphery, stable waterproofness can be obtained, and a force due to vibration or bending of the earphone plug 7 is prevented, so that rattling can be prevented. Thereby, no unreasonable force is applied to the joint between the foot 2a of the earphone jack 2 and the printed circuit board 5, and a highly reliable multipolar earphone plug connection device can be realized.
[0021]
(Embodiment 4)
Next, a fourth embodiment of the present invention will be described. FIG. 7A shows a configuration of a multipolar earphone plug connection device according to Embodiment 4 of the present invention, FIG. 7B is a perspective view of a seal ring, and FIG. 8A is a diagram in which an earphone plug is inserted into an earphone jack. FIG. 8B is an enlarged sectional view of a portion A in FIG. 8A. The second embodiment differs from the first embodiment shown in FIGS. 1 and 2 only in the waterproof structure of the earphone plug and the earphone jack. Only the different parts will be described.
[0022]
7 and 8, an annular convex portion 41 is formed on the end face 8a of the main body portion of the earphone plug 7 downward from the outer peripheral surface thereof. On the other hand, a seal ring 42 is fitted into the opening 4 of the housing 1. The seal ring 42 includes a cylindrical portion 42a and a base flange portion 42b. The cylindrical portion 42a has an inner peripheral portion having an inner diameter slightly larger than the outer diameter of the cylindrical terminal 10 of the earphone plug 7. 42c is formed, and the upper surface of the flange portion 42b also has an annular convex portion 42d. Although the seal ring 42 is formed of a rubber material, silicone rubber is particularly preferable in terms of aging and migration.
[0023]
Next, the operation of the earphone plug connection device according to the fourth embodiment will be described. The seal ring 42 is fitted into the opening 4 of the housing 1 from the back side in advance, and the annular convex portion 42 d is pressed against the back surface of the housing 1. When the plug terminal 9 of the earphone plug 7 is pushed and inserted into the insertion hole 3a of the plug insertion portion 3 of the earphone jack 2, the plug terminal 9 is connected to the electrode of the insertion hole 3a, and the cylindrical terminal 10 is connected to the plug insertion portion 3 And is connected to the electrode of the cylindrical portion 3b. When the earphone plug 7 is inserted into the earphone jack 2, the cylindrical terminal 10 of the earphone plug 7 presses against the annular convex portion 42 c of the seal ring 42, and the tip of the cylindrical portion 42 a contacts the end face 8 a of the main body of the earphone plug 7. Further, the annular convex portion 41 of the main body end face 8 a contacts the surface of the housing 1 around the opening 4. Accordingly, it is possible to prevent external water and dust from entering the housing 1 through the opening 4, and even if the main body 8 of the earphone plug 7 is moved in a horizontal plane, the cylindrical terminal 10 is attached to the seal ring 42. Since it is held, no stress is applied to the solder joint between the printed board 5 and the foot 2a of the earphone jack 2, and breakage is prevented. It is preferable that the diameter of the annular projection 41 is as large as possible from the viewpoint of waterproof performance. Further, when the plug is inserted, the seal ring 41 can be blindfolded by the annular convex portion 41 of the earphone plug 7, which is excellent in design. When the earphone plug 7 is not used, the earphone jack cover 12 is inserted into the earphone jack 2 to close the opening 4.
[0024]
As described above, according to the fourth embodiment, in the opening 4 of the housing 1, the cylindrical portion 42 a of which the tip contacts the body end face 8 a of the earphone plug 7, and the inner peripheral portion of the cylindrical portion 42 a Since the seal ring 42 is formed and provided with an annular convex portion 42c that is in pressure contact with the cylindrical terminal 10, stable water resistance is obtained, and the force due to vibration and bending of the earphone plug 7 is prevented by the seal ring 42. Therefore, rattling can be prevented. Thereby, no unreasonable force is applied to the joint between the foot 2a of the earphone jack 2 and the printed circuit board 5, and a highly reliable multipolar earphone plug connection device can be realized.
[0025]
(Embodiment 5)
Next, a fifth embodiment of the present invention will be described. 9 shows a configuration of a multipolar earphone plug connection device according to Embodiment 5 of the present invention. FIG. 10 (a) is a cross-sectional view of an earphone plug inserted into an earphone jack, and FIG. 10 (b) is an earphone jack. FIG. 3 is a cross-sectional view of a state in which an earphone jack cover is put on the device. In the fifth embodiment, the seal ring 42 and the earphone jack cover 12 in the fourth embodiment are integrally formed by a bridge 51. The seal ring 42, the earphone jack cover 12, and the bridge 51 are integrally formed of a rubber material, preferably a silicone rubber material. Thereby, in addition to the effect of the fourth embodiment, there is an effect that the number of parts can be reduced.
[0026]
In each of the above embodiments, the shape of the annular protrusion and the annular protrusion has a curved surface at the tip, but it is more preferable that the shape is a lip shape with a sharp point in terms of waterproofness.
[0027]
【The invention's effect】
As described above, the multipolar earphone plug connection device of the present invention is attached to the multipolar earphone plug having the cylindrical terminal on the outer periphery of the base of the plug terminal projecting from the earphone plug main body, and the opening of the housing. A multipolar earphone plug connection device comprising: an earphone jack to which the earphone plug is connected; an annular projection around the cylindrical terminal of the earphone plug main body; Equipped with an annular convex part that faces or contacts the convex part, stable water resistance can be obtained while considering design, and a stable connection can be secured even if there is vibration or bending, and reliability is improved. A high multipolar earphone plug connection device can be obtained.
[Brief description of the drawings]
1A is a perspective view showing a relationship between an earphone plug and an earphone jack of a multipolar earphone plug connection device according to a first embodiment of the present invention; FIG. 1B is a partially enlarged view of the earphone plug as viewed from below; (A) Cross-sectional view showing a state in which an earphone plug according to Embodiment 1 of the present invention is inserted into an earphone jack. (B) Enlarged cross-sectional view of part A in FIG. 2 (a). [FIG. 3] Embodiment 2 of the present invention. FIG. 4A is a perspective view showing a relationship between an earphone plug and an earphone jack of the multipolar earphone plug connection device in FIG. 4A. FIG. 4A is a cross-sectional view showing a state where the earphone plug in the second embodiment of the present invention is inserted into the earphone jack. FIG. 4 is an enlarged sectional view of a portion A in FIG. 4A. FIG. 5 is a perspective view showing a relationship between an earphone plug and an earphone jack of the multipolar earphone plug connection device according to the third embodiment of the present invention. (A) A sectional view showing a state in which an earphone plug according to Embodiment 3 of the present invention is inserted into an earphone jack. (B) An enlarged sectional view of a portion A in FIG. 6 (a). FIG. 8B is a perspective view showing the relationship between the earphone plug and the earphone jack of the multipolar earphone plug connection device according to the fourth embodiment. FIG. 8B is a perspective view of a seal ring according to the fourth embodiment of the present invention. Sectional view showing the state where the earphone plug according to Embodiment 4 is inserted into the earphone jack. (B) Enlarged sectional view of part A in FIG. 8 (a). [FIG. 9] Multipolar earphone plug connection device according to Embodiment 5 of the present invention. FIG. 10 (a) is a perspective view showing a relationship between an earphone plug and an earphone jack. Sectional view showing a state in which covering an earphone jack cover to the jack 11 is a sectional view showing a structure of a conventional earphone plug connection device [Description of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2 Earphone jack 3 Plug insertion part 4 Opening 5 Printed circuit board 6 Annular convex part 7 Earphone plug 8 Body part of earphone plug 9 Plug terminal 10 Cylindrical terminal 11 Annular convex part 12 Earphone jack covers 21 and 22 Annular convex part 31 Ring-shaped protrusion 32 First ring-shaped protrusion 33 Second ring-shaped protrusion 41 Ring-shaped protrusion 42 Reel ring 51 Bridge

Claims (5)

A multipolar earphone including a multipolar earphone plug having a cylindrical terminal on the outer periphery of a plug terminal protruding from an earphone plug main body, and an earphone jack attached to an opening of a housing and connected to the earphone plug. In the plug connection device, an annular projection is provided around the cylindrical terminal of the earphone plug body, and an annular projection facing the inside of the annular projection of the earphone plug body is provided in the opening of the housing. A multipolar earphone plug connection device. A multipolar earphone including a multipolar earphone plug having a cylindrical terminal on the outer periphery of a plug terminal protruding from an earphone plug main body, and an earphone jack attached to an opening of a housing and connected to the earphone plug. In the plug connection device, an annular projection is provided around the cylindrical terminal of the earphone plug body, and an annular projection is provided at the opening of the housing so as to be in contact with the outside of the annular projection of the earphone plug body. A multipolar earphone plug connection device. A multipolar earphone including a multipolar earphone plug having a cylindrical terminal on the outer periphery of a plug terminal protruding from an earphone plug main body, and an earphone jack attached to an opening of a housing and connected to the earphone plug. In the plug connection device, a first annular protrusion and a second annular protrusion are provided around the cylindrical terminal of the earphone plug body, and the first opening of the earphone plug body is provided in the opening of the housing. A multipolar earphone plug connection device, comprising: an annular projection facing the inside of the annular projection; and the opening contacting the outside of the second annular projection. A multipolar earphone including a multipolar earphone plug having a cylindrical terminal on the outer periphery of a plug terminal protruding from an earphone plug main body, and an earphone jack attached to an opening of a housing and connected to the earphone plug. The multipolar earphone plug according to any one of claims 1 to 3, wherein in the plug connection device, a seal ring is provided in the opening of the housing to contact a main body of the earphone plug and a cylindrical terminal. Connection device. 5. The multipolar earphone plug connection device according to claim 4, wherein the seal ring is formed integrally with an earphone jack cover for closing the earphone jack from the outside when the earphone plug is removed from the earphone jack.

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