JP3041098U - Single head plug - Google Patents

Abstract

(57) [PROBLEMS] To provide a single-headed plug having a small number of parts protruding to the outside of a device when inserted into a jack. A mandrel 21 of a tip 20 having a contact portion 22.
Is connected to the conductor 42 introduced from the cord 40, and the conductor 4 is attached to the body 12 on the rear end side of the ring 10 having the contact portion 11.
1 is connected. A window 13 for introducing the conductor 42 is formed in the body portion 12, and even if the mandrel 21 is short, the conductor 4 is formed.
Connection with 2 is possible. The contact portion 31 of the sleeve 30 is covered on the outer side of the body portion 12. Contact part 31
The hem portion 32 extended to the connection portion 2 is a connection point 2 of the conductors 41 and 42.
It extends so as to cover 1a and 12a. That is, the connecting portions 21a, 1
There is 2a. The conductor 13 is connected to the outer periphery of the hem portion 32, and the conductor 13 is embedded together with the connection portions 21a and 12a in the insulating member 50 to reinforce the strength.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a single-head plug that connects a cord to audio equipment, electronic equipment, and the like.

[0002]

[Prior art]

 FIG. 2 is a front view showing a conventional single pole plug for three poles. This three-pole single-head plug comprises a tip 1, a ring 2 and a sleeve 3. The tip 1 is made of metal and has a substantially columnar contact portion 1a arranged on the tip side of the tip 1 and a mandrel 1b extending to the rear end of the contact portion 1a. The outer diameter of the mandrel 1b is smaller than that of the contact portion 1a. The ring 2 is also made of metal, and has a cylindrical contact portion 2a whose tip is arranged near the rear end of the contact portion 1a, and a cylindrical body portion 2b extending from the rear end of this contact portion 2a. And have. The outer diameter of the body portion 2b is smaller than that of the contact portion 2a. The sleeve 3 is also made of metal, and has a cylindrical contact portion 3a having a tip disposed near the rear end of the contact portion 2a of the ring 2 and a cylindrical contact portion 3a extending to the rear end of the contact portion 3a. It has a skirt portion 3b. The outer diameter of the skirt portion 3b is larger than that of the contact portion 3a, and a step 3c is formed between the contact portion 3a and the skirt portion 3b.

The mandrel 1b of the chip 1 penetrates the inside of the ring 2, and an insulating collar 4 is formed in the gap between the mandrel 1b and the ring 2 so as to fill the gap. The insulating collar 4 insulates the tip 1 from the ring 2, and the insulating collar 4 is also formed between the rear end of the contact portion 1a of the tip 1 and the tip of the contact portion 2b of the ring 2. Has been done. The body 2b of the ring 2 penetrates the inside of the sleeve 3, and an insulating collar 5 is formed in the gap between the body 2b and the sleeve 3 so as to fill the gap. The insulating collar 5 insulates the ring 2 from the sleeve 3, and the insulating collar 5 is also formed between the rear end of the contact portion 2a of the ring 2 and the tip of the contact portion 3b of the sleeve 3. ing.

The rear end side of the insulating collar 5 projects from the rear end of the skirt portion 3b of the sleeve 3, and the rear end side of the body 2b projects and is exposed from the rear end of the insulating color 5. The rear end side of the insulating collar 4 projects from the rear end of the body portion 2b, and the rear end side of the mandrel 1b projects from the rear end of the insulating collar 4 and is exposed. When assembling a single-head plug for 3 poles, for example, the tip 1 and the ring 2 are set at predetermined positions of the mold, and the insulating collar 4 is formed by injection molding of resin, and the tip 1, the ring 2 and the insulating collar 4 are formed. Unify. Then, the integrated product and the sleeve 4 are set in another mold, and resin injection molding is performed. Insulation color 5 is formed by injection molding of this resin, and a single-head plug as shown in FIG. 2 is manufactured.

To the single-headed plug assembled as shown in FIG. 2, three conductors of the cord, which are insulated from each other, are connected to connect the cord. That is, each conductor of the cord is connected to the exposed rear end side of the mandrel 1b, the exposed rear end side of the body 2b, and the outer peripheral surface of the skirt 3b. At the stage where the cords are connected, for example, a third resin injection molding is performed to form a mold part (not shown), and the connection part of each conductor is buried. The molding part reinforces the strength of the cord against tension. The outer peripheral surface of the skirt portion 3b is also covered by this mold portion. If necessary, the mold may be covered with a protective cover to prevent breakage due to bending of the cord. When using the single-head plug assembled as described above, the single-head plug is inserted from the tip side into a jack provided in an audio device or an electronic device. That is, the contact portion 1a at the tip of the chip 1 is inserted in this order from the contact portion 2a and the contact portion 3a, and is inserted until just before the step 3c. In the state of being fitted in the jack, the contact portions 1a, 2a, 3a come into contact with the contacts provided in the jack corresponding thereto, and the cord and the device are connected. This single-head plug is inserted into and removed from the jack by gripping the mold part and the protective cover.

FIG. 3 is a front view showing a conventional single-pole plug for two poles. The two-pole single-head plug is provided with a tip 6 and a sleeve 7, and the ring 2 of the three-pole single-head plug is omitted. Similar to the tip 1 of FIG. 2, the tip 6 is formed of a substantially columnar contact portion 6a and a mandrel 6b extending from the rear end of the contact portion 6a. The sleeve 7 has a cylindrical contact portion 7a whose tip is arranged in the vicinity of the rear end of the contact portion 6a, and a cylindrical hem portion 7b extended to the rear end of this contact portion 7a. . The outer diameter of the skirt portion 7b is larger than that of the contact portion 7a, and a step 7c is formed between the contact portion 7a and the skirt portion 7b. The mandrel 6b of the tip 6 penetrates the inside of the sleeve 7, and an insulating collar 8 is formed in the gap between the mandrel 6b and the sleeve 7 so as to fill the gap. The insulating collar 8 insulates the tip 6 from the sleeve 7, and the insulating collar 8 is formed between the rear end of the contact portion 6 a of the tip 6 and the tip of the contact portion 7 a of the sleeve 7. Has been done. The rear end side of the insulating collar 8 projects from the rear end of the skirt portion 7b, and the rear end side of the mandrel 6b further projects from the rear end of the insulating collar 8.

When assembling the two-pole single-head plug, the procedure is similar to that of the three-pole single-head plug. After the insulating collar 8 is molded by resin injection molding, the cord is connected. In connecting the cords, the two conductors of the cords are respectively connected to the exposed rear end side of the mandrel 6b and the exposed outer peripheral surface of the hem portion 7b. At the stage where the cords are connected, resin injection molding is performed to form a mold part, which buries the connection part of each conductor and covers the outer periphery of the hem part 7b. Further, a protective cover is put on the mold part if necessary. The two-pole single-head plug is used by gripping the molded part and the protective cover, and then inserted into and removed from the jack of the device in the same way as the three-pole single-head plug.

[0008]

[Problems to be solved by the device]

 However, the conventional three-pole and two-pole single-head plugs have the following problems. The axial lengths of the hem portions 3b and 7b of the three-pole and two-pole single-head plugs are respectively secured to the extent necessary for connecting the conductors of the cord. That is, a length is secured to secure the conductivity of the conductor connecting portion and the mechanical strength of the connecting portion. Further, the trunk portion 2b and the mandrels 1b and 6b also project from the rear ends of the skirt portions 3b and 7b, respectively, by a length necessary for connecting the cords. For example, from the step 3c of the three-pole single-head plug to the rear end of the mandrel 1b, that is, the portion whose length is shown as L1 in FIG. 2 is the portion that protrudes from the device even if the single-head plug is fitted into the jack. It has become. Also in the 2-pole single-head plug, the portion from the step 7c to the rear end of the mandrel 6b, that is, the portion whose length is shown as L2 in FIG. 3, protrudes from the device even if the single-head plug is fitted into the jack. It is the part to do. These protruding parts were covered with a mold part or covered with a protective cover, so that the part that protruded outside the equipment was large. If the length of the body portion 2b and the mandrel 1b, 6b is shortened in order to reduce the portion protruding to the outside of the device, the area for connecting the conductors cannot be sufficiently obtained, and it becomes difficult to maintain the necessary electrical characteristics. Not only that, there is a possibility that a problem may occur in the pull-out strength property of the cord. In addition, as shown in FIGS. 2 and 3, after forming the insulating collars 4, 5, and 8, the conductors are connected, and then the molded portion for burying the conductor connecting portion is formed. It was hanging.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the first to fifth inventions of the present invention are configured as follows in a single-head plug to which a cord having first, second and third conductors is connected. doing. That is, the single-headed plugs of the first to fifth inventions have a cylindrical conductive first contact portion, a conductive cylindrical shape smaller than an outer diameter of the first contact portion, and a tip end thereof. A body portion extending from the rear end of the contact portion and having the first conductor connected to the rear end side thereof; and a ring formed in the body portion and having a window for introducing the second conductor. A mandrel formed in a conductive rod shape inserted in the ring, the front end side protruding from the front end of the ring, and the rear end side exposed from the window and connected to the second conductor introduced from the window. And a chip having a substantially columnar conductive second contact portion extending at the tip of the mandrel, and a conductive member having an outer diameter substantially the same as the outer diameter of the first contact portion. A third tubular structure that is formed on the outside of the body and has the second conductor interposed between the body and the mandrel. A conductive tubular shape extending from the touching portion and the rear end of the third contact portion to a position covering the connection portion of the ring with the first conductor is formed, and the first and second conductive portions are provided inside. A sleeve having a skirt in which the second conductor is interposed and the outer peripheral surface is connected to the third conductor. Further, the single-head plug is formed in the gap between the ring and the sleeve and the gap between the ring and the tip, and at the connection point between the ring and the first conductor, the tip and the tip. An insulating member is provided so as to bury the connection point with the second conductor and the connection point with the third conductor of the sleeve and to cover the outer circumference of the skirt and the cord.

The sixth to ninth inventions have the following configurations in the single-headed plug to which the cord having the first and second conductors is connected. That is, the single-headed plugs of the sixth to ninth inventions have a conductive rod shape, and have a mandrel to which the first conductor is connected on the rear end side and a substantially columnar shape extended to the tip of the mandrel. And a tip having a conductive first contact portion, and a conductive cylindrical shape having a tip disposed near the rear end side of the first contact portion, and a tip covered on the outside of the mandrel. A second contact portion and a conductive tubular shape, and extends from the rear end of the second contact portion to a position that covers the connection point of the chip with the first conductor and has the first contact portion on the outer peripheral surface. A skirt to which the two conductors are connected, a window formed in the skirt for introducing the first conductor, and a sleeve in which the first conductor is interposed. . Further, the single-head plug is formed in a gap between the tip and the sleeve, and is embedded with a connection point between the tip and the first conductor and a connection point between the sleeve and the second conductor. In addition, an insulating member formed so as to cover the outer periphery of the skirt and the cord is provided.

According to the first to fifth inventions, since the single-head plug is configured as described above, the first conductor is connected to the body of the ring and the second conductor is inserted into the ring. Connected to the tip mandrel. When assembling a single-headed plug, a window is formed in the body to expose the rear end of the mandrel, so the second conductor can be introduced to connect to the mandrel even if the mandrel does not protrude from the body. It has become. After the first and second conductors are connected, the third contact portion of the sleeve is overlaid on the outside of the barrel. The skirt portion of the sleeve is extended to a position where the third conductor is connected to the outer peripheral surface and the connection portion of the ring with the first conductor is covered. Therefore, the connection point between the ring and the first conductor and the connection point between the chip and the second conductor are located closer to the tip side than the rear end of the sleeve. Then, the connection point between the ring and the first conductor, the connection point between the chip and the second conductor, and the connection point between the sleeve and the third conductor are buried with an insulating member, and each connection is made by this insulating member. The place is reinforced.

According to the sixth to ninth aspects, the first conductor is connected to the mandrel of the chip, and the second contact portion of the sleeve is covered on the outer side of the mandrel. When assembling a single-headed plug, a window is formed in the hem of the sleeve to expose the rear end side of the mandrel, so that the first conductor and mandrel can be connected even if the mandrel does not protrude from the hem. There is. The second conductor is connected to the outer circumference of the hem. That is, the connection point between the first conductor and the mandrel and the connection point between the second conductor and the sleeve are located closer to the tip side than the rear end of the sleeve. A connecting portion between the first conductor and the mandrel and a connecting portion between the second conductor and the sleeve are buried with an insulating member, and each connecting portion is reinforced by the insulating member. Therefore, the above problem can be solved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a sectional view of a single pole plug for three poles showing a first embodiment of the present invention, and FIG. 4 is an exploded perspective view of an essential part of FIG. It is a figure. 5A to 5C are views showing the structure of the ring 10 in FIG. 4, where FIG. 5A is a plan view of the ring 10 and FIG. 5B is a front view of the ring 10. Also, FIG. 6C is a sectional view taken along line AA of FIG. The structure of the three-pole single-head plug will be described with reference to FIGS. 1, 4, and 5A to 5C. Note that, in FIG. 4, an insulating member described later is omitted for simplification. As shown in FIG. 1, the three-pole single-head plug is composed of a ring 10, a tip 20, a sleeve 30, a cord 40 connected to these, and an insulating member 50.

The ring 10 is formed by forming a cylindrical first contact portion 11 as shown in FIG. 4, a body portion 12 extending to the rear end of the contact portion 11 and a notch of the body portion 12. And a window 13 for introducing the conductor inside. The rear end side of the window 13 is open. The ring 10 is formed by punching out a metal plate having good conductivity, for example, and rolling the metal plate into a tubular shape. The outer diameter of the body portion 12 is shown in FIGS. As shown in c), it is formed smaller than the outer diameter of the contact portion 11. A connection piece 12a for connecting a conductor is provided on the rear end side of the body portion 12, and the connection piece 12a projects to the rear end side of the single-head plug. The size of the connecting piece 12a is as large as necessary to ensure the electrical conductivity with the connected conductor and the mechanical strength of the connecting portion. As shown in FIG. 4, the tip 20 has a rod-shaped mandrel 21 inserted into the ring 10 and a substantially columnar second contact portion 22 extending from the tip of the mandrel 21. The mandrel 21 and the contact portion 22 are made of, for example, an integral metal, and have a certain conductivity. The front end side of the mandrel 21 projects from the front end of the contact portion 11 of the ring 10, and the rear end side of the mandrel 21 is exposed from the window 13 by a length required for connecting conductors. The contact portion 22 is a portion that comes into contact with a contact inside the jack arranged corresponding to the contact portion 22 when the single-head plug is fitted in the jack, and has a shape suitable for the contact. . The contact portion 22 of FIG. 1 has a head portion 22a on the front end side, and a constriction 22b having an outer diameter smaller than that of the head portion on the rear end side of the head portion 22a. A large collar portion 22c is formed. The mandrel 21 extends from the center of the rear end of the collar portion 22c.

The sleeve 30 has a cylindrical third contact portion 31 having an outer diameter substantially the same as the outer diameter of the contact portion 11, and a cylindrical hem portion extending at the rear end of the contact portion 31. And 32. The contact portion 31 is covered on the outside of the body portion 12 of the ring 10. The outer diameter of the skirt portion 32 is larger than the outer diameter of the contact portion 31, and a step 33 is provided between the contact portion 31 and the skirt portion 32. The rear end portion of the hem portion 32 is further expanded in outer diameter to form a collar portion 34. The hem portion 32 is extended to a position that covers the connection piece 12a. The contact portion 31 and the skirt portion 32 are formed of an integral metal and ensure a certain conductivity. First to third conductors 41, 42, 43 of the cord 40 are connected to the rear ends of the ring 10, the tip 20, and the sleeve 30, respectively.

FIG. 6 is an enlarged cross-sectional view of the cord 40 in FIG. Each of the conductors 41 to 43 is covered with an insulator 44. These insulation-coated conductors 41 to 43 are twisted together, and a jacket 45 is applied thereon. As the conductors 41 to 43, an annealed copper single wire, a tin-plated annealed copper single wire, and a conductor obtained by assembling them may be considered. Other structures are possible as the structure of the code 40. For example, in some cases, the conductors 41 and 42 covered with the insulator 44 are twisted together, and a collective shield and an outer cover 45 are provided on the conductors 41 and 42. In this case, the shield becomes the conductor 43 and is connected to the sleeve 30. In addition, a cord in which a shield is individually provided on an insulator 44 that covers each of the conductors 41 and 42 and they are insulated by an outer cover 45 having a spectacle-shaped cross section is also conceivable. Both shields become conductors 43 when accommodating this cord. Further, a cord (flat type three-core cord) in which the conductors 41, 42, 43 are arranged in parallel without the outer cover 45 can also be connected to the single-head plug.

As shown in FIG. 1, the conductor 41 is connected to the connecting piece 12 provided on the body 12 of the ring 10. The conductor 42 is introduced from the window 13 and connected to the rear end side portion 21 a of the mandrel 21. The conductor 43 is connected to the outer circumference of the skirt portion 32. That is, the rear end side of the contact portion 31 of the sleeve 30 has the conductor 41 interposed between the body portion 12 and the mandrel 21, and the skirt portion 32 has the conductors 41 and 42 disposed inside. Further, an insulating member 50 is formed in the gap between the ring 10 and the tip 20 and the gap between the ring 10 and the sleeve 30. This insulating member 50 buries the connection point 12a between the ring 10 and the conductor 41, the connection point 21a between the tip 20 and the conductor 42, and the connection point 32a with the conductor 43 of the sleeve 30, and at the same time, the outer periphery of the skirt 30 and the cord. It is formed so as to cover the terminal portion of 40. The step portion 33 of the sleeve 30 and the flange portion 34 are configured to fix the insulating member 50 so as not to move. FIG. 7 is a cross-sectional view showing the formation of the insulating member 50 of FIG. 1, and FIG. 8 is a perspective view showing a processing example of the cord 40. The procedure for assembling the three-pole single-head plug will be described with reference to FIGS. 1, 4, 7, and 8.

Various procedures can be considered when assembling the three-pole single-head plug of FIG. 1. In the first embodiment, an example in which the insulating member 50 is formed by injection molding of resin twice is shown. Will be explained. First, the ring 10 and the tip 20 are prepared and set in a mold, and injection molding of polyethylene or urethane resin having excellent fluidity is performed. By injection molding at this time, as shown in FIG. 7, between the contact part 11 of the ring 10 and the mandrel 21 and the collar part 22c of the tip 20, and between a part of the body 12 of the ring 10 and a part of the mandrel 21. Insulating member 50 is formed in between, and insulating member 50 is formed so as to cover the outer periphery of a part of body 12 of ring 10. At the stage of completion of this injection molding, the rear end side of the body 12 of the ring 10 and the connecting piece 12a are exposed from the insulating member 50, and the rear end side of the mandrel 21 is formed on the rear end side of the ring 10. It is exposed through the window 13.

Next, in order to connect the cord 40 to the single-head plug, the outer jacket 45 of the end of the cord 40 is stripped off, and the insulator 44 is peeled off to expose the conductors 41 to 43 for a required length. In the case of connecting the conductors 41 to 43 by soldering, if the exposed portions of the conductors 41 to 43 are pre-soldered at this point, post-processing becomes easy. As shown in FIG. 4, only the conductor 41 and the conductor 42 which are covered with insulation are passed through the inside of the sleeve 30 from the rear end side, and the conductor 41 is connected to the exposed connection piece 12a of the ring 10. Before and after connecting the conductor 41, the conductor 42 is connected to the exposed rear end side of the mandrel 21 of the chip 20. When the outer diameter of the cord 40 is small, the cord 40 is passed through the sleeve 30 as shown in FIG.

FIG. 8 is a perspective view showing another processing example of the cord 40. In the code 40 of FIG. 8, the conductors 41 and 42 are covered with an insulator 44, and shields 43a and 43b are individually provided on the insulators. Each of the shields 43a and 43b is insulated and covered by an eyeglass-shaped outer cover 45. The shield 43a and the shield 43b serve as the conductor 43 as described above. When the outer diameter of the cord 40 is small, the shields 43a and 43b are twisted and then folded back, and the entire cord 40 is passed through the sleeve 30. As a result, the conductors 41 and 42 pass through the inside of the skirt portion 32 of the sleeve 30. In this state, the conductor 41 is connected to the connecting piece 12a, and the conductor 42 is connected to the rear end side of the mandrel 21. The conductors 41, 42 are connected to the ring 10 and the chip 20, for example, by soldering. Besides soldering, a method of connecting by spot welding or the like can be considered. After the connection between the mandrel 21 and the conductor 42 and the connection between the conductor 41 and the connection piece 12a are completed, the sleeve 30 is moved to cover the contact portion 31 on the body portion 12 of the ring 10 covered with the insulating member 50. Then, the conductor 43 is connected to the outer peripheral surface of the skirt portion 32 of the sleeve 30 in a half-pad. That is, the outer peripheral surface of the skirt portion 32 serves as the connection point 32 a with the conductor 43. The connection between the conductor 43 and the sleeve 30 is not limited to soldering and may be spot welding.

When the connection of the conductors 41, 42, 43 is completed, the ring 10, the tip 20, and the sleeve 30 are set in a mold and resin injection molding is performed. Possible types of resin include polyethylene and urethane having excellent fluidity. The injected resin flows into the gaps on the rear end side of the ring 10 and the tip 20 and the remaining gaps between the ring 10 and the sleeve 30, and burys the connection points 21a, 12a, 32a. When the injected resin hardens, the insulating member 50 having the shape shown in FIG. 1 is completed. Even if the cord 40 is pulled by the insulating member 50, the tension is not directly applied to the connection points 21a, 12a, 32a.

Further, if necessary, a protective cover 55 for softening the bending of the cord 40 is covered, as shown by a dashed line in FIG. In the vicinity of the single-head plug, the cord 40 is extremely frequently bent, so that the provision of the protective cover 55 can prevent the cord 40 from being broken. The protective cover 55 is locked to the outer peripheral surface of the insulating member 50 exposed on the rear end side of the sleeve 30 to introduce the cord 40, and all or one of the insulating member 50 exposed from the rear end side of the sleeve 30. Cover the part to protect the inside. The single-head plug assembled as shown in FIG. 1 is inserted from the exposed tip side of the chip 20, and is inserted into a jack attached to an electronic device or an audio device. In the jack, contacts corresponding to the ring 10, the tip 20 and the sleeve 30, respectively, are arranged, and when the single-head plug is fitted, the contacts 10, 11 of the ring 10, tip 20 and sleeve 30 are inserted into the respective contacts. 22 and 31 contact each other. As a result, the conductors 41 to 43 of the cord 40 are connected to the device. The insertion / removal of the single-headed plug is performed by holding the insulating member 50, the protective cover 55 or the cord 40.

The single-headed plug of the first embodiment configured as described above has the following advantages. (1) A window 13 is provided in the ring 10, the conductor 42 is connected to the mandrel 21 by utilizing the window 13, and the conductor 41 is passed through the hem 32 and connected to the connecting piece 12a of the body 12. Therefore, as shown in FIG. 2 of the related art, the area required for connecting the conductors 41 and 42 can be obtained without projecting the body 12 of the ring 10 or the mandrel 21 of the tip 20 from the rear end side of the skirt 32. It can be secured, and the part that jumps out of the device with the single-headed plug inserted in the jack can be made smaller. (2) Since the connecting portions 12a, 21a, 32a of the conductors 41 to 43 are buried and reinforced by the insulating member 50, even if the cord 50 is pulled, it can withstand the same as in the conventional case. Therefore, since the portion protruding to the outside of the device is miniaturized, even if the single-head plug is pulled out from the jack while holding the cord 40, the connection points 12a, 21a, 32a do not come off. (3) In the conventional single-head plug shown in FIG. 2, the insulating collars 4 and 5 were formed by resin injection molding twice, and after the conductors were connected, resin injection molding was performed again. In the embodiment, the insulating collars 4 and 5 and the insulating member 50 corresponding to the conventional molding can be formed by only injecting the resin twice, so that the process can be simplified.

Second Embodiment FIG. 9 is a sectional view of a two-pole single-head plug showing a second embodiment of the present invention, and FIG. 10 is an exploded perspective view of FIG. In addition, in FIG. 10, an insulating member 90 described later is omitted for simplification. As shown in FIG. 9, this 2-pole single-head plug is provided with a tip 60 and a sleeve 70, and has a structure in which the ring of the 3-pole single-head plug is omitted. The tip 60 has a rod-shaped mandrel 61 and a substantially columnar first contact portion 62 extending from the tip of the mandrel 61. The mandrel 61 and the contact portion 62 are made of an integral metal and have a certain conductivity. The sleeve 70 covers the outer side of the mandrel 61 of the tip 60, and has a cylindrical second contact portion 71 whose tip is arranged in the vicinity of the rear end of the contact portion 62 of the tip 60, and the rear end of this contact portion 71. It has a skirt portion 72 extending from the side to a position covering the rear end side of the mandrel 61, and a window 73 for introducing the conductor, which is formed by cutting out the skirt portion 72. The outer diameter of the skirt portion 72 is larger than the outer diameter of the contact portion 71, and a step 74 is formed between the contact portion 71 and the skirt portion 72. At the rear end of the hem portion 72, a collar portion 75 having an expanded outer diameter is formed. The contact portion 71 and the skirt portion 72 are made of an integral metal and ensure a certain conductivity. The rear end side of the window 73 is open as shown in FIG.

The first conductor 81 of the cord 80 is connected to the rear end side of the mandrel 61 of the chip 60, and the second conductor 82 is connected to the outer peripheral surface of the hem portion 72 of the sleeve 70. That is, the rear end of the mandrel 61 serves as a connection point 61a with the conductor 81, and a part of the outer peripheral surface of the skirt 72 serves as a connection point 72a with the conductor 82. As the conductors 81 and 82, similar to the first embodiment, an annealed copper single wire, a tin-plated annealed copper single wire, a conductor in which they are assembled, and the like can be considered. Further, as the cord 80, as shown in FIG. 6, a cord having an outer cover 45, a cord in which conductors 81 and 82 having an insulating coating without the outer cover 45 are arranged in parallel, and the like can be connected. An insulating member 90 is formed in the gap between the tip 60 and the sleeve 70. The insulating member 90 further embeds a connection portion 61a between the chip 60 and the conductor 81 and a connection portion 72a between the sleeve 70 and the conductor 82, and also the outer periphery of the hem portion 72 of the sleeve 70 and the end of the cord 80. It is formed so as to cover the portion. The insulating member 90 is fixed by the step 74 and the flange 75.

When assembling such a two-pole single-head plug, as in the first embodiment, in order to connect the cord 80 to the single-head plug, the outer jacket of the end of the cord 80 is stripped off, and the Then, the insulator is peeled off to expose the conductors 81 and 82 for a required length, and the conductors 81 and 82 are prepared. Then, the mandrel 61 of the chip 60 is covered with the sleeve 70 from the contact portion 71 side. When the tip 60 is covered with the contact portion 71 of the sleeve 70, the rear end side of the mandrel 61 is exposed through the window 73. Using the window 73, the conductor 81 is introduced, the tip of the soldering iron is inserted through the window 73, and the mandrel 61 and the conductor 81 are soldered and connected. After the connection between the mandrel 61 of the chip 60 and the conductor 81 is completed, the conductor 82 is soldered to the outer peripheral surface of the skirt portion 72 of the sleeve 70. The connection between the conductors 81 and 82 is not limited to soldering, and spot welding may be used. With the conductors 81 and 82 connected, the chip 60 and the sleeve 70 are set in a mold, and resin injection molding is performed as in the first embodiment. The injected resin flows into the gap between the chip 60 and the sleeve 70 and burys the connection points 61a and 72a of the conductors 81 and 82. When the injected resin hardens, the insulating member 90 having the shape shown in FIG. 9 is completed. Further, as in the first embodiment, a protective cover 95 as shown by the alternate long and short dash line in FIG. 9 is covered if necessary. The protective cover 95 is locked to the outer peripheral surface of the insulating member 90 exposed from the rear end side of the sleeve 70, introduces the cord 80, and exposes all or one of the insulating member 90 exposed from the rear end side of the sleeve 70. Cover the part to protect the inside.

The two-pole single-head plug assembled as shown in FIG. 9 is inserted into a jack attached to an electronic device or an audio device from the exposed tip side of the chip 60 to be fitted therein. In the jack, contacts respectively corresponding to the tip 60 and the sleeve 70 are arranged, and when the single-head plug is fitted, the contacts are brought into contact with the contact portions 62 and 71 of the tip 60 and the sleeve 70, respectively. As a result, the conductors 81 and 82 of the cord 80 are connected to the device. The insertion / removal of the single-head plug is performed by holding the insulating member 90, the protective cover 95 or the cord 80. The single-headed plug of the second embodiment configured as described above has the following advantages.

(1) A window 73 is provided in the sleeve 70, and the conductor 81 is connected to the mandrel 61 by utilizing the window 73. Therefore, it is not necessary to project the mandrel 61 from the rear end side of the hem portion 72 of the sleeve 70 as in the conventional case shown in FIG. 3, and the portion protruding to the outside of the device with the single-head plug fitted in the jack can be miniaturized. . (2) Since the connecting portions 61a and 72a of the conductors 81 and 82 are buried and reinforced by the insulating member 90, even if the cord 80 is pulled, it can withstand the same as in the conventional case. Therefore, since the portion protruding to the outside of the device is miniaturized, even if the single-headed plug is pulled out of the jack while holding the cord 80, the connection points 61a and 72a do not come off. (3) In the conventional single-head plug shown in FIG. 3, the insulating collar 8 is formed in advance, and the resin is injected again after connecting the conductors. However, in the present embodiment, the resin injection molding is performed once. Since the insulating collar 8 and the insulating member 90 corresponding to the conventional mold portion can be formed only by this, the process can be simplified. The present invention is not limited to the above-mentioned embodiment, and various modifications can be made. Examples of such modifications include the following.

(I) The shapes of the contact portions 22, 62 of the chips 20, 60 are not limited to the shapes shown in FIGS. 1 and 9, and for example, depending on the jack to be fitted, a simple columnar shape may be considered. . (Ii) The insulating members 50 and 90 of FIGS. 1 and 9 are fixed in a straight line by aligning the axial directions of the cords 40 and 80 with the axial directions of the ring 10, the tips 20, 60 and the sleeves 30, 70. However, the cords 40 and 80 may be fixed in an L-shape so that their axial directions are orthogonal to each other. By fixing in the L-shape in this way, the length of the portion of the single-headed plug protruding from the side wall of the device can be further reduced. (Iii) In the first embodiment, the connection piece 12a is provided to facilitate the connection of the conductor 41, but the conductor 41 may be connected to the outside of the body portion 12 without providing the connection piece 12a. . In this case, the length of the hem portion 32 of the sleeve 30 can be further shortened.

(IV) In the first embodiment, resin injection molding is performed twice for accuracy control and workability. First, the conductors 41 to 43 are first formed on the ring 10, the chip 20, and the slit. Insulating member 50 can be formed by performing resin injection molding only once by connecting to each of tubes 30 and performing resin injection molding. (V) In the second embodiment, the insulating member 90 is formed by one-time resin injection molding, but it is formed by two-time resin injection molding in order to obtain accuracy on the tip side of the single-head plug. May be done.

[0031]

[Effect of the invention]

 As described in detail above, according to the first to fifth inventions, the ring having the first contact portion, the body portion and the window, the tip having the mandrel and the second contact portion, and the third contact portion. Since the rear end side of the mandrel is exposed from the window when the single-headed plug is assembled, the second sleeve is provided even if the mandrel does not protrude from the body part. The conductor and mandrel can be connected. After the first and second conductors are connected, cover the third contact part of the sleeve on the outside of the body part and connect the third conductor to the hem part. Does not project, and the part of the single-headed plug protruding from the device can be made smaller. In addition, since the connecting portions of the first to third conductors with the ring, the chip and the sleeve are buried and reinforced by the insulating member, even if the cord is pulled when the single head plug is inserted or removed, It is possible to prevent the connection points from coming off. Further, by devising the step of forming the insulating member between the tip and the ring and between the ring and the sleeve, the number of steps for assembling the single-head plug can be reduced.

According to the sixth to ninth inventions, a tip having a mandrel and a first contact portion, a sleeve having a second contact portion, a hem portion and a window formed in the hem portion, and an insulating member. Since the rear end side of the mandrel is exposed from the window when assembling the single-headed plug, it is possible to introduce the first conductor and connect it to the mandrel even if the mandrel does not protrude from the hem. It has become. Therefore, the mandrel and the body do not project from the rear end of the hem, and the part of the single-head plug protruding from the device can be miniaturized. Moreover, since the connection points of the first and second conductors are buried and reinforced by an insulating member, even if the cord is pulled when the single-head plug is inserted into or removed from the jack, these connection points will be disconnected. Can be prevented. Further, by devising the step of forming the insulating member, the number of steps for assembling the single-head plug can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a single pole plug for three poles showing a first embodiment of the present invention.

FIG. 2 is a front view showing a conventional single pole plug for three poles.

FIG. 3 is a front view showing a conventional single pole plug for two poles.

FIG. 4 is an exploded perspective view of FIG.

5 is a diagram showing a structure of a ring 10 in FIG.

FIG. 6 is an enlarged sectional view of a cord 40 in FIG.

7 is a cross-sectional view showing the formation of the insulating member 50 of FIG.

8 is a perspective view showing another processing example of the cord 40. FIG.

FIG. 9 is a cross-sectional view of a two-pole single-headed plug showing the second embodiment of the present invention.

FIG. 10 is an exploded perspective view of FIG.

[Explanation of symbols]

 10 ring 11,22,31,62,71 contact part 12 body part 12a connection piece 13,73 window 20,60 chip 21,61 mandrel 30,70 sleeve 32,72 skirt 40,80 cord 41-43,81, 82 conductor 50,90 insulating member 55,95 protective cover

Claims (9)

[Utility model registration claims] 1. A single-ended plug to which a cord having first, second and third conductors is connected, wherein a cylindrical conductive first contact portion and an outer diameter of the first contact portion Also has a small electrically conductive tubular shape, and has a tip portion extending from the rear end of the contact portion and having a rear end side to which the first conductor is connected, and a notch formed in the body portion. A ring having a window for introducing the second conductor, and a conductive rod-like member inserted into the ring, the tip side of which protrudes from the tip of the ring and the rear side of which is exposed from the window A mandrel connected to the introduced second conductor, a chip having a substantially columnar conductive second contact portion extending at the tip of the mandrel, and an outer diameter of the first contact portion Is formed of a conductive tube having an outer diameter substantially the same as that of, and is covered on the outer side of the body portion and Third interposing the second conductor between the mandrel
Forming a conductive tubular shape extending from the rear end of the contact portion and the rear end of the third contact portion to a position covering the connection portion of the ring with the first conductor, A sleeve having a skirt in which a second conductor is interposed and an outer peripheral surface to which the third conductor is connected, and a gap formed between the ring and the sleeve and a gap formed between the ring and the chip, and The connection point between the ring and the first conductor, the connection point between the tip and the second conductor, and the connection point between the sleeve and the third conductor are embedded, and the outer circumference of the skirt and the above A single-head plug comprising: an insulating member formed so as to cover the cord. 2. The single-head plug according to claim 1, wherein the insulating member is formed by injection molding of resin a plurality of times. 3. The single-head plug according to claim 1, wherein the insulating member is formed by injection molding of resin once. 4. A conductive connecting piece which is connected to the first conductor at a rear end of a body portion of the ring and which protrudes inward of a skirt portion of the sleeve and which is connected to the insulating member. The single-headed plug according to claim 1, further comprising: 5. A protective cover, which is locked to the outer peripheral surface of the insulating member on the rear end side of the sleeve, introduces the cord and covers all or part of the insulating member on the rear end side of the sleeve. The single-headed plug according to claim 1, wherein 6. A single-head plug, to which a cord having first and second conductors is connected, having a conductive rod shape, and a mandrel to which the first conductor is connected on the rear end side, and a mandrel of the mandrel. A tip having a substantially columnar conductive first contact portion extended to the tip, and a conductive cylindrical shape having a tip arranged near the rear end side of the first contact portion, A second contact portion covered on the outer side of the mandrel, and a conductive tubular shape, and extending from the rear end of the second contact portion to a position covering a connection portion of the chip with the first conductor And a skirt to which the second conductor is connected on the outer peripheral surface, a notch formed in the skirt, and a window for introducing the first conductor, and the first conductor is interposed inside Formed in a gap between the tip and the sleeve, and the tip and the first conductor A single-headed plug, comprising: a connection point and an insulating member that is embedded in the connection point between the sleeve and the second conductor and covers the outer circumference of the skirt and the cord. . 7. The single-head plug according to claim 6, wherein the insulating member is formed by injection molding of resin a plurality of times. 8. The single-headed plug according to claim 6, wherein the insulating member is formed by injection molding of resin once. 9. A protective cover, which is locked to the outer peripheral surface of the insulating member on the rear end side of the sleeve, introduces the cord and covers all or a part of the insulating member on the rear end side of the sleeve. The single-headed plug according to claim 6, characterized in that