KR200311523Y1 - Multi polar Plug - Google Patents

Abstract

The present invention relates to a multi-pole plug, comprising: a terminal portion inserted into a jack and electrically connected to a corresponding jack contact terminal, and a plurality of contact terminals such as at least one or more rings and sleeves are insulated from each other on a coaxial axis; And a gripping portion extending from the plurality of contact terminals to the rear of the sleeve and sealing a plurality of solder terminals, respectively, to which corresponding wires are soldered. At least one of the at least one ring or sleeve is formed with an outer circumferential groove in the outer circumferential surface. Therefore, when the terminal portion of the plug is inserted into the jack, the contact portion of the corresponding jack contact terminal contacts the inclined surface in the tip direction of the groove so that the plug receives the force in the insertion direction, thereby increasing the binding force between the plug and the jack.

Description

Multi polar plug

The present invention relates to a multi-pole plug, and more particularly, to a multi-pole plug that is excellent in terminal binding force when inserted into a jack, does not generate noise due to a poor contact, and does not easily fall out of the jack even in a fluctuation of a cord.

As ultra-light weight, miniaturization and slimming of personal handheld devices such as cellular telephones have recently been competitively advanced, the size of earphone jacks or input / output jacks required to be miniaturized is required, and the diameter of the plug inserted into the jack is also small. Small diameter from the plug to the small 2.5mm plug is in progress.

The 3.5 mm small plug has a length of 14 mm inserted into the jack, and has been mainly used for portable audio equipment such as stereo earphones of an FM radio receiver or stereo earphones of a portable cassette tape recorder. This 3.5mm small plug is mainly composed of three poles to enjoy stereo music, but recently, the technology of adopting the remote control in the middle of the earphone wire to improve the versatility and portability of the portable cassette tape recorder has been developed. The number of poles of the mm small 3-pole plug is multipolar to 4 poles, 5 poles, 6 poles, and the like.

In the case of a 3.5mm plug, the length of the terminal inserted into the jack is long and the diameter is large so that the tip gripping force of the jack is sufficient to maintain sufficient tensile force so that it cannot be easily pulled out.

However, in the case of the 2.5 mm plug, the binding force with the jack decreases as the diameter and the length of the terminal portion decrease, so that the problem of being easily released is pointed out.

1 shows a conventional 2.5mm 5-pole plug 10 comprising rod-shaped 4-pole terminals 12, 14, 16, and 18 and a 1-pole annular terminal 20. The five-pole jack 30 is composed of a body portion 40 and the neck portion 60. Body portion 40 is provided with a tip contact terminal 42, the first ring contact terminal 44, the second ring contact terminal 46, the sleeve contact terminal 48. A cap-shaped contact terminal 62 is provided around the outer circumferential surface of the neck portion 60, and a plug insertion port 64 is formed from the center end of the neck portion 60 to the body portion 40.

As shown in FIG. 1, the plug 10 inserted into the jack 30 is in electrical contact with the corresponding contact terminals of the jack and is gripped by the frictional force due to elasticity. In particular, the tip terminal 12 is in contact with the tip contact terminal 42 forms an inclined surface by the elastic force applied to the inclined surface, the plug is subjected to a force in the insertion direction is bound.

However, as the diameter of the plug was reduced to 2.5 mm, the inclination of the inclined surface was also reduced, and the elastic force and the gripping force also decreased as the thickness and size of each contact terminal of the jack were reduced. Moreover, considering the manufacturing tolerances of jacks and plugs, the tensile strength due to diameter reduction is significantly lower than that of the existing 3.5mm plugs and jacks, resulting in a weakening of the binding force.

An object of the present invention is to provide a multi-pole plug that can be combined with the existing jack while increasing the binding force with the jack to change the structure of the contact terminal to solve the problems of the prior art.

1 is a view for explaining the shape of a conventional 2.5mm 4-pole plug.

Figure 2 is a view for explaining the shape of the 2.5mm 4-pole plug of the first preferred embodiment according to the present invention.

3 is a partially cutaway perspective view of a first embodiment of the present invention;

4 is an exploded perspective view of terminals of the first embodiment of the present invention;

5 is a view for explaining the insulating material inserting mold structure according to the first embodiment of the present invention.

6 is a view showing a state in which the plug of the first embodiment of the present invention is inserted into the jack.

7 and 8 are views showing a plug structure of a second preferred embodiment according to the present invention.

9 is a view for explaining the structure of the insulating material inserting mold structure according to the second embodiment.

10 and 11 are views showing a plug structure of a third preferred embodiment according to the present invention.

12 is a view showing the configuration of a hands-free ear microphone of the cellular phone to which the plug of the present invention is applied.

Explanation of symbols on the main parts of the drawings

10, 100, 200, 300: Plug 30: Jack

40: body 42, 44, 46, 48: jack contact terminal

50, 52: auxiliary terminal 60: neck portion

62: cap type contact terminal 64: insertion hole

90: contact terminal support 92: support stand

94: cover

110, 310: tips 112, 122, 132, 142; Contact terminal

114, 124, 134, 146: soldering terminal 120: first ring

130: second ring 140, 240: sleeve

144: flange 150: insulation

248: protruding jaw

In order to achieve the above object, a plurality of contact terminals, such as a tip, at least one ring and a sleeve, inserted into a jack of the present invention and electrically connected to corresponding jack contact terminals, are arranged insulated from each other on a coaxial axis. And a gripping portion extending from the plurality of contact terminals to the rear of the sleeve, the gripping portion sealing a plurality of solder terminals to which corresponding wires are respectively soldered, wherein the at least one ring or sleeve includes: One of the grooves is formed in the outer circumferentially extending groove in the circumferential direction, the contact portion of the corresponding jack contact terminal when the terminal portion of the plug is inserted into the jack is in contact with the inclined surface in the tip direction of the groove so that the plug It is characterized by receiving strength.

In the present invention, the terminal portion of the multipole plug is based on a 2.5mm diameter 4-pole plug.

In the present invention, it is preferable that the deepest portion of the groove is biased toward the grip portion than the contact portion with the jack contact terminal so that the inclined surface in the grip portion direction is steeper than the inclined surface in the tip direction.

In addition, the tip of the present invention includes the tip, the first slope, the locking step, the second slope, the locking groove, the third slope, the end, the contact portion of the corresponding jack contact terminal does not deviate from the second slope The slope of the second inclined surface is increased so that the corresponding jack contact terminal remains open when the plug is inserted.

In the present invention, the tip has a coupling groove in which a rod-shaped soldering terminal is forcibly fitted to the rear side of the end, and the inlet edge of the coupling groove preferably protrudes rearward and a protrusion having a free edge extending radially is formed. Do. This protrusion allows the tip of the plug to be more firmly attached to the plug structure.

The sleeve of the present invention has a protrusion extending in the circumferential direction on the outer circumferential surface, and when the terminal portion of the plug is inserted into the jack, the contact portion of the corresponding jack contact terminal contacts the inclined surface of the holding portion of the protrusion so that the plug is connected. It is also possible to force in the insertion direction.

In addition, the present invention is a terminal portion inserted into the jack and electrically connected to the corresponding jack contact terminals, respectively, a plurality of contact terminals such as at least one ring and sleeve are arranged insulated coaxially with each other, and the plurality of A multi-pole plug including a gripping portion extending from the contact terminals behind the sleeve, respectively, and sealing a plurality of solder terminals to which corresponding wires are soldered, respectively, wherein the contact terminals of the tip have a tip, a first inclined surface, a locking jaw, A ratio of the horizontal length of the second inclined surface to the third inclined surface, including a second inclined surface, a locking groove, a third inclined surface, and an end thereof, wherein the contact portion of the corresponding jack contact terminal does not deviate from the second inclined surface; It is characterized in that 5 to 1: 1.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention in detail as follows.

Typically, 2.5 mm plugs and jacks are required to have a combined tensile strength of about 0.8 kg or more. Therefore, the present invention is to improve the plug structure to maintain the binding tensile strength of more than about 0.8kg.

2 to 6 are views for explaining the structure of the 2.5mm 4-pole plug according to the present invention.

Referring to the drawings, the plug 100 of the first embodiment of the present invention includes a tip 110, the first ring 120, the second ring 130, the sleeve 140. Between them is electrically insulated by the insulating material 150.

The tip 110 includes an Ω-shaped contact terminal 112 inserted into the jack and contacting the jack contact terminal and a pin-shaped solder terminal 114 having a diameter of 0.5 to 0.6 mm extending rearward from the contact terminal 112.

The contact terminal 112 of the tip 110 has a front end 112a, a first slope 112b, a locking jaw 112c, a second slope 112d, a locking groove 112e, a third slope 112f, and a terminal end. 112g, the protrusion 112h, and the insertion groove 112i.

The contact terminal 112 of the tip 110 is standardized to have a total length from the tip 112a to the end 112g of 3.8 ± 0.1 mm. The tip contact terminal 42 of the jack 30 is standardized to contact the second slope 112d within about 1.2 mm to 1.6 mm from the tip of the contact terminal 112.

In the present invention, the deepest portion of the locking groove 112e is located at a 1.6mm to 2.0mm portion from the tip to increase the inclination of the second inclined surface 112d within the allowable limit. The increase of the second inclination increases the binding force between the plug 100 and the jack 60 because the tip contact terminal 42 of the jack increases the insertion force of the plug in the force of pressing the second inclined surface 112d. .

If the inclination of the second inclined surface 112d is too steep, the insertion force component becomes larger, but if the inclination exceeds the predetermined inclination, the distance that the locking jaw 112c pushes the tip contact terminal 42 of the jack 30 outward becomes shorter. do. This phenomenon causes an operation problem in which the first switch contact of the jack 30 cannot be turned off even when the plug is inserted.

In addition, when the deepest portion of the locking groove 112e is located within 1.6 mm from the tip, the tip contact terminal 42 of the jack 30 is in contact with the third slope 112f. In this case, since the tip contact terminal 42 of the jack 30 presses the third inclined surface 112f, the component force acts in the direction opposite to the insertion direction, that is, the grip portion of the plug 100. Therefore, this dichotomy must be avoided because the plug 100 acts in the direction from which the jack 30 is released.

Therefore, in order to increase the inclination of the second inclined surface 112d while the tip contact terminal 42 is not in contact with the third inclined surface 112f, the deepest portion of the engaging groove 112c is 1.6 mm to 2.0 mm from the tip. The outer circumferential surface of the contact terminal 112 should be machined to be in the range. That is, the ratio of the horizontal length of the second slope 112d and the third slope 112f has a range of 5: 1 to 1: 1.

The outer diameter of the latching jaw 112c is preferably 2.3 + 0.03mm and has a positive tolerance of 0.03mm. The end 112g maintains the diameter of the raw material at 2.4 mm. Therefore, in the present invention, since the tip 110 cuts the rod-shaped material of 2.4 mm to form the locking step 112c and the locking groove 112e, the outer diameter of the locking step 112c has a positive tolerance at 2.3 mm. It is possible to process. However, from the 2.3 mm rod-shaped material, it is impossible to process the outer diameter of the locking step 112c to have a positive tolerance at 2.3 mm, and thus have a negative tolerance. Therefore, the outer diameter of the tip catching jaw 112c of the present invention and the outer diameter of the conventional tip catching jaw are at least about 0.06 mm.

The difference in the outer diameter of the locking step increases the contact force with the terminals of the jack when inserted into the jack can prevent the occurrence of noise due to poor contact or the plug can be easily pulled out from the jack.

A protrusion 112h is formed on the rear surface of the end 112g of the tip 20, and an insertion groove 112i is formed in which one end of the pin-type solder terminal 114 is inserted by a punching method by punching. The edge of the free end of the protrusion 112h is radially extended so that the insulating material 150 is sandwiched between the rear end of the protrusion and the extension part so that the tip 20 is more firmly coupled.

The first ring 120 has an outer diameter of 2.45 mm to 2.5 mm and a ring-shaped contact terminal 122 having a length of 1.2 mm to 1.8 mm and a 1.1 mm outer diameter extending rearward from the end of the contact terminal 122. Pipe type soldering terminal 124 is included. The contact terminal 122 is spaced apart from the end of the contact terminal 112 of the tip 110, for example, 0.7 mm apart from the solder terminal 114 of the tip 110. The total length of the first ring 120 is shorter than the total length of the soldering terminal 114 of the tip 110 so that the soldered portion of the end portion of the soldering terminal 114 of the tip 110 is sufficiently exposed. The contact terminal 122 of the first ring 120 should have an outer diameter greater than the terminal outer diameter of the contact terminal 112 of the tip 20 to be supported in the mold during the insert process of the insulating material.

The outer circumferential surface of the contact terminal 122 of the first ring 120 is formed with a groove 120a extending in the circumferential direction. In the groove 120a, when the terminal portion of the plug 100 is inserted into the jack, the contact portion of the corresponding jack contact terminal 44 contacts the inclined surface 120b in the tip direction of the groove 120a so that the plug is forced in the insertion direction. Receive. The deepest portion of the groove 120a is biased toward the grip portion than the jack contact terminal 44 and the contact portion so that the inclined surface 120c in the grip portion direction is steeper than the inclined surface 120b in the tip direction. This groove structure increases the jack binding force of the plug 100.

The second ring 130 has a 2.5 mm outer diameter with positive tolerance and a ring-shaped contact terminal 132 having a length of 1.2 mm to 1.8 mm and a pipe having a 1.8 mm outer diameter extending rearward from the end of the contact terminal 132. And a soldering terminal 134. The contact terminal 132 of the second ring 130 is spaced apart from the end of the contact terminal 122 of the first ring 120 by a predetermined distance, for example, 0.7 mm, and the outer edge of the solder terminal 124 of the first ring 120. Is placed on. The total length of the second ring 130 is shorter than the length of the soldering terminal 124 of the first ring 120 so that the soldering portion of the end portion of the soldering terminal 124 of the first ring 120 is sufficiently exposed.

The contact terminal 132 of the second ring 130 should have an outer diameter larger than the outer diameter of the contact terminal 122 of the first ring 120 to be supported in the mold during the insert process of the insulating material.

A groove 130a extending in the circumferential direction is formed on the outer circumferential surface of the contact terminal 132 of the second ring 130. In the groove 130a, when the terminal portion of the plug 100 is inserted into the jack, the contact portion of the corresponding jack contact terminal 36 contacts the inclined surface 130b in the tip direction of the groove 130a so that the plug is forced in the insertion direction. Receive. The deepest portion of the groove 130a is biased toward the grip portion than the jack contact terminal 36 and the contact portion so that the inclined surface 130c in the grip portion direction is steeper than the inclined surface 130b in the tip direction. This groove structure increases the jack binding force of the plug 100.

The sleeve 140 has a pipe-type contact terminal 142 having the same outer diameter as the ring-shaped contact terminal 132 of the second ring 130, a flange 144, a pipe-type soldering terminal extending rearward of the flange 144. 146. The flange 144 defines the final end of the plug that is inserted into the jack.

The total length of the sleeve 50 is shorter than the total length of the soldering terminal 134 of the second ring 130 so that the soldered portion of the end portion of the soldering terminal 134 of the second ring 130 is sufficiently exposed. Is supported by the flange 144 in the mold during the insert process of the insulating material. Each terminal tip 110, the first ring 120, the second ring 130, and the sleeve 140 of the 2.5 mm 4-pole plug according to the present invention configured as described above are in turn soldered terminal 114 of the tip 110. ) Into the insert mold of FIG. 3.

The insert mold is composed of a contact terminal support 90, a support 92, and a lid 94.

First, when the assembly of the 4-pole terminals is mounted in the support through hole 90a formed in the contact terminal support 90, the tip 110 is supported by the inclined surface 90b of the support through hole 90a. The first ring 120 is supported by the front end of the contact terminal 122 by the first step 90c of the support through hole (90a). The second ring 130 is supported by the tip of the contact terminal 132 by the second step 90d of the support hole 90a. The tip of the flange 144 is supported at the periphery of the sleeve 140 by the sleeve 140.

Accordingly, the tip 110 and the first ring 120 are spaced 0.7 mm apart, and the first ring 120 and the second ring 130 are 0.7 mm apart, and the second ring 130 and the sleeve are spaced 0.7 mm apart. 140 is supported by the contact terminal support 90 at intervals of 0.7mm.

The support through holes 90a of the contact terminal support 90 are each of the contact terminals 112, 122, 132, and 142 of the tip 110, the first ring 120, the second ring 130, and the sleeve 140. Reamer is processed to correspond to the outer diameter and length of For example, the inner diameter (a) of the locking jaw portion of the tip 110 is processed to 2.325 to 2.23 mm and a depth of 2.0 mm, and the end portion (b) of the tip 10 is processed to an inner diameter of 2.415 to 2.42 mm and a depth of 1.8 mm. do.

Subsequently, the contact terminal portion c of the first ring 120 is processed to have an inner diameter of 2.475 to 2.48 mm and a depth of 1.9 to 2.5 mm, and the contact terminal portion d of the second ring 130 and the sleeve 140 is The inner diameter is 2.545 ~ 2.55mm and the depth is 4.6mm.

As such, the contact terminal support 90 into which the plug assembly is inserted is inserted into the groove 92a of the pedestal 92. Thus, the lower end portions of the solder terminals of the sleeve second ring, the first ring and the tip are interviewed and supported by the pedestal 92, respectively.

By covering the pedestal 92 with the lid 94, the upper half of each solder terminal 146, 134, 124, 114 of the sleeve and tip is interviewed and supported on each corresponding surface formed in the lid 94. The end portions of the solder terminals 124 and 134 of the first ring and the second ring are supported by the support protrusions 94a and 94b, respectively.

In this way, the plug assembly is fixed in the insert mold, and then the insulating material 150 is injected into the space in the mold through the gate, and the insulating material 150 is injected through the space formed between the assemblies to electrically insulate the terminals. do.

As shown in FIG. 5, four terminals are electrically insulated from each other and mechanically fixed by a single insulating insert process to form a plug structure.

Therefore, the insulating material 150 is formed integrally. The front of the flange 144 of the sleeve 140 is the contact terminal 112 of the tip 110, the insulating ring 150a, the contact terminal 122 of the first ring 120, the insulating ring 150b, the second ring A rod-shaped plug terminal portion in which the contact terminals 132, the insulating ring 150c, and the contact terminals 142 of the sleeve 140 are sequentially arranged is formed.

After the flange 144 of the sleeve 140, the sleeve solder terminal 146, the solder terminal 134 of the second ring 130, the solder terminal 124 of the first ring 120, and the tip 110 of the sleeve 140 are in turn. Solder terminals 114 are exposed in a stepped manner. A wire corresponding to each exposed solder terminal, for example, a grounding wire for the soldering terminal 146 of the sleeve, a microphone wire for the soldering terminal 134 of the second ring, and an R wire for the soldering terminal 124 of the first ring The solder wire 114 of the tip is connected to the L wire by soldering, respectively.

Alternatively, the ground wire is connected to the solder terminal 146 of the sleeve, the control wire is connected to the solder terminal 134 of the second ring, the microphone wire is connected to the solder terminal 124 of the first ring, and the earphone is connected to the solder terminal 114 of the tip. The lines can each be connected by soldering.

In this way, after the wires corresponding to the respective solder terminals are connected by soldering, the soldering portions are molded by the secondary inserting insulating material, and finally, the insulating cap is covered to form the grip portion of the plug.

At least one annular contact terminal may be assembled to the outer periphery of the flange of the sleeve of the terminal assembly to form a 5-pole and a 6-pole structure.

Referring to FIG. 6, a conventional 5-pole jack 30 includes a body portion 40 and a neck portion 60. Body portion 40 is provided with a tip contact terminal 42, the first ring contact terminal 44, the second ring contact terminal 46, the sleeve contact terminal 48. In addition, the first auxiliary terminal 50 and the second auxiliary terminal 52 are provided.

Before the plug is inserted, the free end 42a of the tip contact terminal 42 of the jack 30 is maintained in electrical contact with the first auxiliary terminal 50 by the elastic restoring force. The tip contact terminal 42 and the first auxiliary terminal 50 constitute the first switch SW1. In addition, the free end 44a of the first ring contact terminal 44 is also maintained in electrical contact with the second auxiliary terminal 52 by the elastic restoring force. The first ring contact terminal 44 and the second auxiliary terminal 52 constitute a second switch SW2.

Therefore, the electronic device set determines that the plug is not inserted when both the first switch SW1 and the second switch SW2 of the jack 30 are on, and checks that the plug is inserted when both are off. .

A cap-shaped annular contact terminal 62 is provided around the outer circumferential surface of the neck portion 60, and a plug insertion port 64 is formed from the center end of the neck portion 60 to the body portion 40.

When the plug 100 of the first embodiment is inserted into the jack 30, electrical contact is made as shown.

That is, the plug 100 is inserted into the jack 30 so that the curved portion 42b of the tip contact terminal 42 is pushed backward by the locking step 112c of the contact terminal 112 of the tip 110. A contact point 42a is separated from the first auxiliary terminal 50. The first switch SW1 maintains a turn off state. The curved portion 42b of the tip contact terminal 42 maintains contact on the second inclined surface 112d past the locking step 112c. The second inclined surface 112d forms an inclined surface having a high insertion direction and a low opposite direction. Therefore, since the curved portion 42b presses the inclined surface 112d by the elastic restoring force, the component force acts in the insertion direction on the inclined surface.

In the groove 120a of the contact terminal 122 of the first ring 120, the curved portion 44b of the first ring contact terminal 44 contacts the inclined surface 120b. Since the free end 44a of the first ring contact terminal 44 is in contact with the second auxiliary terminal 52, the second switch SW2 maintains a turn-off state. Similarly, since the curved portion 44b presses the inclined surface 120b by the elastic restoring force, the component force acts in the insertion direction.

Similarly, although not shown in the drawing, the contact portion of the second ring contact terminal 46 in the groove 130a has the same function as described above.

Therefore, in the first embodiment of the present invention, as the component force acts in the insertion direction by the jack contact terminals as well as the tip and the first ring and the second ring, the gripping force of the plug 100 in the jack 30 is improved. Therefore, the plug 100 does not easily come off from the jack 30.

6 and 7 show a plug structure of a second embodiment according to the present invention.

The plug 200 of the second embodiment is different from the plug 100 in that the protrusion 248 extending in the circumferential direction is formed in the contact terminal 242 of the sleeve 240. The sleeve 240 includes a contact terminal 242, a flange 244, and a solder terminal 246. Since the remaining parts are the same, the same reference numerals are used and the description is omitted. The protruding jaw 248 is oriented in a tip direction from the center of the contact portion of the sleeve contact terminal 38 of the jack 30. Therefore, contact is made at the holding part side inclined surface 248a of the protruding jaw 248. Therefore, the component force is obtained in the insertion direction by the elastic restoring force of the sleeve contact terminal 38. This component acts as a force for suppressing the plug 200 from coming off the jack 30.

The insertion hole 64 of the neck portion 60 of the jack 30 may extend the inner diameter of the insertion hole 64 to the insertion depth of the projection jaw 2480 to match the outer diameter of the projection jaw 248. The projection jaw 248 If the height of is given within the tolerance, it is not necessary to extend the inner diameter of the insertion port (64).

Referring to FIG. 9, in the insert insert jig of the insulating material, the inner diameter of the support hole 90a is extended to the insertion depth of the protruding jaw 248 to form a third step 90e.

10 and 11 show the plug structure of the third embodiment. The plug 300 treats the first inclined surface 312b and the second inclined surface 312d of the contact terminal 312 of the tip 110 in a spherical shape compared with the plugs 100 and 200, and the groove is formed only in the first ring. The point is different. There is no groove in the outer circumferential surface of the contact terminal 332 of the second ring. Spherical treatment of the second inclined surface 312d of the tip further increases the inclination of the contact portion of the curved portion 32b of the tip contact terminal 32, thereby further increasing the component force in the insertion direction.

12 shows the structure of a hands-free ear microphone of a cellular phone employing a minimum diameter plug according to the present invention. As shown, the handsfree ear microphone includes a plug 410, a microphone 420, and an earphone 430. In the present invention, the rod-shaped 4-pole is formed from the plug of 2.5mm diameter to realize the remote control or stereo function.

As described above, in the present invention, by forming a groove on the outer circumferential surface of the ring, the contact portion of the ring contact terminal of the jack is caught in the groove so that the tension is increased as compared with a conventional plug, thereby improving contact with the terminals of the jack. The occurrence of noise due to defects is reduced and does not fall well.

The present invention is not limited to the above-described specific preferred embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention claimed in the registered claims. Of course, such changes will fall within the scope of the claims.

Claims (11)

A tip portion inserted into the jack and electrically connected to corresponding jack contact terminals, respectively, a terminal portion in which a plurality of contact terminals such as at least one ring and a sleeve are arranged to be insulated from each other coaxially, and from the plurality of contact terminals, respectively A multi-pole plug which extends behind the sleeve and includes a gripping portion for sealing a plurality of solder terminals to which respective wires are soldered. At least one of the at least one ring or sleeve is formed in the outer peripheral surface grooves extending in the circumferential direction, the contact portion of the corresponding jack contact terminal when the terminal portion of the plug is inserted into the jack inclined surface in the tip direction of the groove And the plug is pressed against the force in the insertion direction. The multi-pole plug according to claim 1, wherein the terminal portion has a 2.5-mm diameter 4-pole structure. The multi-pole plug according to claim 2, wherein the deepest portion of the groove is biased toward the grip portion than the contact portion of the jack contact terminal so that the inclined surface in the grip portion direction is steeper than the inclined surface in the tip direction. The tip of claim 1, wherein the tip includes a tip, a first inclined surface, a locking jaw, a second inclined surface, a locking groove, a third inclined surface, and an end, and the contact portion of the corresponding jack contact terminal does not deviate from the second inclined surface. And wherein the corresponding jack contact terminal increases the inclination of the second inclined surface to maintain the switch open state when the plug is inserted. 5. The multipole plug of claim 4, wherein a ratio of the horizontal lengths of the second slope and the third slope of the tip is within a range of 5: 1 to 1: 1. 5. The tip of claim 4, wherein the tip has an insertion groove in which a rod-shaped soldering terminal is forcibly fitted to a rear surface of an end, and a protrusion protruding backward from the inlet edge of the insertion groove and a radial extension of the free end of the insertion groove. Multi-pole plug, characterized in that formed. A tip portion inserted into the jack and electrically connected to corresponding jack contact terminals, respectively, a terminal portion in which a plurality of contact terminals such as at least one ring and a sleeve are arranged to be insulated from each other coaxially, and from the plurality of contact terminals, respectively A multi-pole plug which extends behind the sleeve and includes a gripping portion for sealing a plurality of solder terminals to which respective wires are soldered. The sleeve has a protrusion extending in the circumferential direction on the outer circumferential surface, and when the terminal portion of the plug is inserted into the jack, the contact portion of the corresponding jack contact terminal contacts the inclined surface of the grip portion direction of the protrusion so that the plug is inserted. Multi-pole plug, characterized in that the force received. According to claim 7, wherein the at least one ring is formed in the outer peripheral surface grooves extending in the circumferential direction, the contact portion of the corresponding jack contact terminal when the terminal portion of the plug is inserted into the jack inclined surface in the tip direction of the groove And the plug is pressed against the force in the insertion direction. The multi-pole plug according to claim 8, wherein the deepest portion of the groove is biased toward the grip portion than the contact portion of the jack contact terminal so that the inclined surface in the grip direction is steeper than the inclined surface in the tip direction. 8. The tip of claim 7, wherein the tip comprises a tip, a first inclined surface, a locking jaw, a second inclined surface, a locking groove, a third inclined surface, and an end, and the contact portion of the corresponding jack contact terminal does not deviate from the second inclined surface. And wherein the corresponding jack contact terminal increases the inclination of the second inclined surface to maintain the open state when the plug is inserted. A terminal portion inserted into the jack and electrically connected to corresponding jack contact terminals, respectively, a terminal portion in which a plurality of contact terminals such as at least one ring and a sleeve are arranged to be insulated from each other coaxially, and from the plurality of contact terminals, respectively A multi-pole plug which extends behind the sleeve and includes a gripping portion for sealing a plurality of solder terminals to which respective wires are soldered. The contact terminal of the tip includes a tip, a first inclined surface, a locking jaw, a second inclined surface, a locking groove, a third inclined surface, and an end, and the contact portion of the corresponding jack contact terminal does not deviate from the second inclined surface. The ratio of the horizontal length of the second inclined surface and the third inclined surface is 1: 5 to 1: 1 multi-pole plug.