WO2010021072A1

WO2010021072A1 - Multipole, single-head plug

Info

Publication number: WO2010021072A1
Application number: PCT/JP2009/002747
Authority: WO
Inventors: 弓立伸也
Original assignee: 株式会社エクセル電子
Priority date: 2008-08-19
Filing date: 2009-06-17
Publication date: 2010-02-25
Also published as: CN201975649U; JP2010049838A

Abstract

Provided is a multipole, single-head plug having a core rod divided into five poles wherein compatibility with a conventional standardized single-head plug can be ensured. The core rod of a small five-pole, single-head plug (10) comprises first through fifth electrodes (11-15) consisting of a conductive metal, and insulation collars (21-24) consisting of an insulator for insulating the electrodes (11-15) from each other. The first electrode (11) has an external shape substantially similar to that of a tip electrode provided at the tip of a standardized small single-head plug, and is provided, at a position where a spreading-out plug locking portion of the tip electrode of a standardized small single-head plug is located, with, sequentially from the distal end side, a swelling portion (11a) which swells outward beyond the slope at a plug locking portion, a steep slope portion (11b) where a steep slope having a gentle inclination angle steeper than that of the slope at the plug locking portion in the insert direction is formed, and a gentle slope portion (11c) having a gentle inclination angle.

Description

Multi-pole single-head plug

The present invention relates to a plug as an electrical connector for conducting a conductive connection, and more particularly to a multipolar plug that ensures compatibility so that it can be used even if the number of poles is different.

First, single-head plugs and jacks defined in Japanese Industrial Standard JIS C 6560 will be described. JIS C
6560 defines dimensions of ultra-small (φ2.5) single-head plug jack, small (φ3.5) single-head plug jack, and large (φ6.3) single-head plug jack. Note that the international standards supported by JIS C 6560 are IEC 60130-8 and IEC 60603-11.

FIG. 10 is a diagram showing the dimensions of a two-pole ultra-small single-head plug (φ2.5 mm) defined in JIS C-6560. As shown in the figure, the first electrode (chip), the first insulating collar, and the second electrode (sleeve) are sequentially exposed from the tip on the surface of the core rod portion of the two-pole ultra-small single-head plug. On the base side of the second electrode, there is provided a knob whose tip side end surface serves as a reference surface for dimensions.

Except for tolerances, the first electrode (tip) of the two-pole ultra-small single-head plug specified in JIS C6560 is 7.6 (7.2 + 0.4) from a position 7.2 (6.5 + 0.7) mm from the reference plane of the knob. It is φ2.3mm up to the position of mm, and gradually decreases from φ2.3mm to φ1.8mm from the position of 7.6mm to 8 (7.6 + 0.4) mm from the reference plane, and 10.3mm from the position of 8mm from the reference plane The shape gradually increases from φ1.8mm to φ2.3mm over the position of, and then sharply decreases from φ2.3mm to φ0.9mm over the tip of 10.3mm from the position of 10.3mm from the reference plane. is doing.

Then, the tapered portion in the range of 8 to 10.3 mm from the reference surface of the first electrode prevents “plug disconnection” in which the plug is slightly pulled out by pulling the cord of the plug inserted into the jack. Acts as a plug removal prevention part. In other words, when the plug and the jack are connected, the conductive terminal for the first electrode on the jack side comes into press contact with the inclined surface of the plug removal preventing portion, and the inclined surface of the plug removal preventing portion is conductive when the plug is about to be removed. When the terminal is pushed back, a repulsive force in the insertion direction acts on the plug.

Subsequently, a 4-pole small single-head plug jack (4-Pole) defined in JEITA RC-5325A of the Japan Electronics and Information Technology Industries Association (JEITA) standard.
miniature concentric plugs and jacks). JEITA
The international standard that RC-5325A supports is IEC 60130-8.

In addition, the JIS JISC 6560 stipulated in JIS C 6560 is divided into only two electrodes (second electrode and third electrode), and the JIS C 6560 is divided into two electrodes (second electrode and third electrode). This is a tri-miniature single-head plug specified in C 6560. The third electrode of the three-miniature single-head plug specified in the above JIS C-6560 is further divided into two electrodes (third electrode and fourth electrode) without changing the outer shape, and JEITA RC-5325A Is a four-pole small single-head plug.

Fig. 11 is a diagram showing the dimensions of a 4-pole small single-head plug (φ3.5mm) defined in JEITA RC-5325A. As shown in the figure, the first electrode (chip), the first insulating collar, the second electrode (ring), the second insulating collar, the first electrode (tip) are formed on the surface of the core rod portion of the four-pole small single-head plug. The three electrodes (ring), the third insulating collar, and the fourth electrode (sleeve) are sequentially exposed, and a knob whose tip end face serves as a reference surface for dimensions is provided on the base side of the fourth electrode.

Except for tolerances, the first electrode (tip) of the 4-pole small single-head plug specified in JEITA RC-5325A is 9.6 (9.2 + 0.4) from the position 9.2 (8.5 + 0.7) mm from the reference plane of the knob. From the position of 9.6mm from the reference surface to 10 (9.6 + 0.4) mm, the diameter gradually decreases from φ3.2mm to φ2.5mm, and from the position of 10mm from the reference surface to 13mm. The shape gradually increases from φ2.5mm to φ3mm over the position, and then sharply decreases from φ3mm to φ1mm from the position 13mm from the reference surface to the tip of 14 (13 + 1) mm. Then, the tapered portion in the range of 10 to 13 mm from the reference plane of the first electrode functions as a plug removal prevention portion that prevents “plug removal”.

As described above, as standard plugs used for portable music players, a number of standardized 2- to 4-pole plugs have been provided. However, recent portable music players have various functions, and further increase in the number of poles has been desired due to the necessity of providing a multi-function remote control function.

In order to meet such demands, the following Patent Documents 1 to 4 disclose multipolar plugs and multipolar jacks having 5 or more poles.
Utility Model Registration No. 25545747 Registered Utility Model No. 3078619 Japanese Patent No. 3567658 JP 2002-134237 A

The multipolar plugs disclosed in the above Patent Documents 1 to 4 subdivide the axial surface of the pin (core bar) to increase the number of electrodes, to provide an electrode at the tip of the pin, or to be provided around the base portion of the pin Multipolarization is achieved by providing electrodes on the inner and outer surfaces of the cylindrical portion (plug cover).

Here, when commercializing a multi-pole plug with a 5-pole plug core, the combined multi-pole jack is not compatible with conventional 2- to 4-pole plugs, etc. It will be limited and will be a hindrance to popularization.

However, in the multipolar plug divided into five poles described in the above patent document, the core rod is simply divided into five electrodes without considering compatibility with the conventional standardized 2-4 pole plug. Therefore, it is difficult to support both these 5-pole plugs and standardized 2- to 4-pole plugs with a single multi-pole jack.

The present invention has been made to solve such problems, and is a multipolar single-head plug in which the core rod is divided into five poles, and is compatible with a conventional standardized single-head plug or the like. An object is to provide a multipolar single-head plug that can be secured.

In order to solve the above-described problems, a multipolar single-head plug according to the present invention insulates the first to fifth electrodes, which are sequentially exposed from the front end side in the core rod portion, and the first to fifth electrodes. In the multipolar single-head plug having the core rod portion divided into five poles, the first electrode is substantially the same as the tip electrode provided at the tip of the standardized small single-head plug. A bulge that has the same outer shape and that bulges from the tip side to the outside of the inclined surface of the plug removal prevention part at the position where the tip plug removal prevention part of the chip electrode of the standardized small single-head plug is located. A standardized small size, comprising a plug removal prevention portion provided with a protruding portion and a steep slope portion formed with a steep slope with a gentler inclination angle than the inclination angle with respect to the insertion direction of the inclined surface of the plug removal prevention portion. Compatible with single head plug Characterized in that the secured.

The multi-pole single-head jack according to the present invention is a multi-pole single-head jack connected to the multi-pole single-head plug, and is electrically conductive while being pressed against the first to fifth electrodes when connected to the housing. A first conductive terminal comprising two conductive terminals arranged in contact with each other so as to be in conductive contact with each other at the steep slope portion; And a second conductive terminal to a fifth conductive terminal.

The multipolar single-head plug according to the present invention is a multipolar single-head plug in which the core rod is divided into five poles, and can be compatible with conventional standardized multipolar single-head plugs, etc. A single-head plug can be provided.

Hereinafter, embodiments of the present invention will be described in detail. As described above, the increase in the number of poles from the two-pole single-head plug to the three-pole single-head plug is realized by dividing the second electrode on the base side into two to be the second electrode and the third electrode. The increase in the number of poles from the three-pole single-head plug to the four-pole single-head plug is defined in the standard so as to be realized by dividing the third electrode into two to be the third electrode and the fourth electrode. Yes.

Thus, in the standard two-pole to four-pole single-head plug, the existing electrodes are only divided in order to increase the number of poles. Therefore, it is easy to ensure compatibility. If the conductive terminal corresponding to each electrode of the 4-pole single-head plug is installed in the multi-pole jack, all single-heads of 2-pole, 3-pole and 4-pole are provided. Can correspond to a plug.

However, if the fourth electrode of the standardized four-pole single-head plug is divided into two electrodes in order to increase the number of poles of the five-pole plug obtained by dividing the core rod into five poles, see FIG. As can be seen, since the length of the fourth electrode in the axial direction is originally short, the length in the axial direction of the divided fourth and fifth electrodes becomes extremely short. It becomes difficult to install a conductive terminal that is in stable conductive contact with the fifth electrode.

Therefore, in order to realize a multipolar plug in which the core rod capable of stable conductive contact is divided into five poles, the existing electrodes are not divided, but the arrangement positions of the first to fifth electrodes are newly set as a whole. However, it is also necessary to make a design that ensures compatibility with the conventional standardized 2-pole to 4-pole plugs.

(First embodiment)
The φ3.5 mm five-miniature single-head plug shown in FIG. 1 is designed in consideration of such points. FIG. 1 is a plan view of a core bar portion of a five-miniature single-head plug according to a first embodiment. In order to ensure compatibility with the standardized 2 to 4 pole single head plug, the 5 pole small single head plug is in conductive contact with each of the first to fifth electrodes, and the standardized 4 pole single head plug is used. There is a need to provide a multipolar jack in which a plurality of conductive terminals are arranged so as to be in conductive contact with each of the first to fourth electrodes of the head plug.

However, unlike the conventional standardized small single-head plug, the five-pole small single-head plug according to the present embodiment has completely reviewed the arrangement of the first to fifth electrodes. The arrangement positions of the conductive terminals of the multi-pole jack that can be connected to both the plug and the standardized 2-4 pole single-head plug are also narrower than those of the conventional compatible jack.

In addition, even if the plug cord inserted into the jack is pulled, etc., and the plug is slightly pulled out, the conductive terminal is usually used to ensure the conductive connection between the plug and the jack. The electrodes are designed and arranged with a margin so that the conductive state can be maintained even if a slight amount of plug disconnection (0.4 mm, etc.) is applied.

However, in a multi-pole jack that ensures compatibility between the 5-pole small single-head plug according to this embodiment and the standardized 2-4 pole small single-head plug, the positions where conductive terminals can be arranged are limited. It is difficult to design with a large margin for plug removal. Therefore, in this embodiment, the shape of the first electrode at the tip of the plug is devised to minimize the occurrence of plug disconnection.

Subsequently, the configuration of the five-pole small single-head plug 10 according to the first embodiment will be described in detail with reference to FIGS. 1 and 2. FIG. 2 is a cross-sectional view of the core rod portion of the five-miniature single-head plug according to the first embodiment.

As shown in FIGS. 1 and 2, the rod-shaped core rod, which is a portion inserted into the jack side of the five-miniature single-headed plug 10, includes first to fifth electrodes 11 to 15 made of conductive metal, and each electrode. Insulating collars 21 to 24 made of an insulator for insulating between 11 to 15 are formed.

The rod-shaped first electrode (chip) 11 is located at the center of the core rod and exposed on the surface at the tip of the core rod portion, and this exposed portion is in conductive contact with the jack-side terminal. A cylindrical second electrode (ring A) 12 is disposed outside the first electrode 11 with a first insulating collar 21 as an insulating layer interposed therebetween. Similarly, toward the outside of the core rod, the second insulating collar 22, the third electrode (ring B) 13, the third insulating collar 23, the fourth electrode (ring C) 14, the fourth insulating collar 24, the second Five electrodes (sleeves) 15 are sequentially installed.

Further, on the surface of the core rod, the first electrode (chip) 11, the first insulating collar 21, the second electrode (ring A) 12, the second insulating collar 22, the third electrode (ring B) 13, and the third insulating A collar 23, a fourth electrode (ring C) 14, a fourth insulating collar 24, and a fifth electrode (sleeve) 15 are sequentially exposed on the surface from the tip side toward the root, and a five-pole electrode on the core rod Is formed.

On the base side of the fifth electrode 15, there is provided a knob 28 that is an end face on the plug side that comes into contact with the end face of the jack inlet when inserted into the jack, and that the end face on the front end serves as a reference surface for dimensions. Yes.

The first electrode 11 has substantially the same outer shape as the first electrode of the standardized 2 to 4 miniature single-head plug, but the shape of the inclined surface of the plug removal prevention portion is different as will be described later. There are some structural differences, including First, the first electrode of the standard small single-head plug is exposed on the surface of the core rod within a range of 9.2 to 14 mm from the reference surface of the knob. The first electrode 11 according to the present embodiment is It is exposed on the core rod surface within the range of 9.3 (8.9 + 0.4) to 14mm from the reference plane.

As shown in FIG. 1, the first electrode 11 has a diameter of 9.3 to 10.1 (12.3-) from the reference surface while maintaining φ3.2 mm at 9.3 (12.3-3) to 9.7 (12.3-2.6) mm from the reference surface of the knob 28. 2.2) It gradually becomes thinner from φ3.2mm to φ2.5mm over mm, and gradually becomes thicker from φ2.5mm to φ2.7mm over a 10.1 to 11.5 (12.3-0.8) mm from the reference surface (slow slope) From 11.5 to 12.3 mm from the reference surface, it suddenly thickens from φ2.7 mm to φ3 mm (steep slope), and from the reference surface to 12.3 to 13 mm, it remains φ3 mm (parallel surface), and 13 to 14 from the reference surface (13 +1) It has a shape that sharply decreases from φ3mm to φ1mm over the tip of mm.

As described above, in the first electrode 11 of the five-pole small single-head plug 10 according to the present embodiment, the plug omission prevention portion having a single inclined surface in the conventional standardized 2-4 pole small single-head plug. A parallel surface (bulging portion) 11a, a steep slope (steep slope portion) 11b, and a gentle slope (slow slope portion) 11c are provided from the front end side at a position where 10 is located (10 to 13 mm from the reference surface). And, since it is configured to prevent the plug from being removed by the steep slope 11b whose angle is steeper than the inclined surface of the standard plug removal prevention part, it is more than the conventional standardized 2-4 ultra small single-head plug. , Plug disconnection can be greatly suppressed.

FIG. 3 shows an enlarged plan view of the first electrode 11 according to the first embodiment. In addition, a two-dot chain line in FIG. 3 indicates the shape of the plug removal prevention portion of the first electrode of the conventional standardized 2-4 miniature single-head plug. As shown in the figure, the starting point on the tip side of the parallel surface 11a and the starting point of the inclined surface of the standard plug removal prevention portion are the same position, and the end point on the base side of the gentle slope 11c and the standard product plug prevention The end point of the inclined surface of the portion is only shifted by 0.1 mm in the axial direction, the first electrode and the first electrode of the standard product have substantially the same shape, and the first electrode 11 is the same as the standard product. The shape is easy to ensure compatibility.

The first electrode 11 bulges slightly outward from the inclined surface of the standard first electrode indicated by a two-dot chain line on the parallel surface 11a to form a bulging portion, but sharply narrows on the steep slope 11b. Thus, at the end of the steep slope 11b on the base side, the thickness is substantially the same as the standard first electrode (inside 0.03 mm). The gentle slope 11c has substantially the same shape as the slope of the standard plug removal prevention portion, and the slope is 4.1 °.

As described above, in the present embodiment, the first electrode 11 is provided with the parallel surface 11a on the distal end side of the plug removal prevention portion, and constitutes a bulging portion that swells outward from the inclined surface of the standard plug removal prevention portion. As a result, the outer shape of the first electrode 11 is substantially the same as the first shape of the standard product, ensuring compatibility, and preventing plug removal at a steeper angle than the inclined surface of the standard product plug removal prevention portion. It is possible to provide the steep slope 11b.

In order to suppress plug disconnection more significantly, the angle of the steep slope 11b acting as a plug disconnection prevention slope may be tightened or the axial length of the steep slope 11b may be increased. 11 enters the inner side (thinner) on the gentle slope 11c larger than the sloped surface of the standard plug removal prevention part, so when connected to a conventional standardized 2-4 pole multipole jack There is a possibility that the problem that it becomes impossible to contact the conductive terminal on the jack side may occur. Therefore, it is desirable not to make the angle of the steep slope 11b too tight or make the length of the steep slope 11b in the axial direction too long.

Further, in order to make the angle of the steep slope 11b more tight, if the surface of the steep slope 11b bulges outside larger than the slope of the plug removal prevention portion of the standard product, it becomes an impediment to ensuring compatibility with the standard product. End up. In the present embodiment, at the boundary between the parallel surface 11a and the steep slope 11b, the radius is 0.05 mm larger and bulges outward by 0.05 mm. In order to ensure compatibility, the first electrode 11 is configured not to swell by more than 0.2 mm from the sloped surface of the standard part of the plug removal prevention part, and the shape of the first electrode 11 and the standardized first electrode is the same. It is desirable to maintain a substantially similar outer shape.

Further, in order to provide the first electrode 11 with an inclined surface steeper than the inclined surface of the standard plug removal prevention portion, it is necessary to provide an inclined surface with a gentler angle than the standard plug removal prevention portion inclined surface. In order to ensure compatibility, it is desirable not to provide the first electrode 11 with a surface that enters (thinners) larger than the inclined surface of the standard plug removal prevention portion. Specifically, if the shape of the first electrode 11 enters 0.2 mm or more inside the standard product plug removal prevention portion inclined surface, there is a risk that conductive contact with the standard multi-pole jack may not be possible. It is desirable that the outer surface of the first electrode 11 be configured not to enter more than 0.2 mm inside the inclined surface of the plug removal prevention portion of the standardized 2 to 4 miniature single-head plug. It is desirable to configure so that it does not enter inside by 0.1 mm or more.

Further, the angle of inclination of the steep slope 11b can be further increased by extending the parallel surface (expanding portion) 11a further to the base side, but the position where the first electrode conductive terminal on the jack side is shifted to the front end side than usual. In the case where the first electrode 11 is conductively contacted at the position of the parallel surface 11a, even if the plug is about to come off, a repulsive force in the insertion direction cannot be applied to the plug from the conductive terminal, It will not be possible to prevent the plug from being removed.

Therefore, it is desirable to make the length of the parallel surface 11a as short as possible, and in order to ensure compatibility more reliably, the length of the parallel surface (bulged portion) 11a in the axial direction is desirably 1 mm or less. . Since the parallel surface 11a starts from a position 1 mm from the tip, the steep slope portion 11b that substantially acts as a plug removal prevention surface is configured such that the tip side end thereof is not separated from the tip of the plug 10 by 2 mm or more. It is desirable.

Considering such points, in the present embodiment, the part corresponding to the sloped surface of the standard product plug removal prevention part in the first electrode is divided into a parallel surface (bulging part) 11a and a steep slope (steep slope part) 11b from the tip side. The slanted slope (slowly sloped portion) 11c is divided into three parts, and the repulsive force at the time of plug removal is strengthened by the steep slope 11b having a steeper angle than that of the standard product, so that the plug removal is suppressed more than before.

Here, the inclination angle of the steep slope 11b acting as an inclined surface for preventing plug removal with respect to the plug insertion direction (axial direction) will be considered. The inclination angle of the inclined surface of the conventional plug standardized 2 to 4 miniature single-head plug plug prevention portion is 4.8 ° in terms of design unless tolerances are taken into account. In the steep slope 11b according to the present embodiment, it is necessary to tighten the inclination angle more than 4.8 ° in order to suppress the plug disconnection than before, but if the angle is too tight, the compatibility with the standard product is maintained as described above. There is a risk that it will not be possible.

In consideration of such points, the inclination angle of the steep slope 11b of the five-pole small single-head plug 10 according to this embodiment with respect to the plug insertion direction is set to 10.6 °. Of course, the angle of the inclined surface of the plug removal preventing portion that can satisfactorily suppress plug removal while ensuring compatibility with standard products is not limited to the above 10.6 °. According to the present inventor, if the inclination angle is 7 ° to 15 °, both compatibility with standard products and prevention of plug disconnection can be achieved.

Subsequently, the connection between the 5-pole small single-head plug and the 5-pole small single-head jack according to the first embodiment will be described with reference to FIGS. FIG. 4 is a perspective view showing a part of the configuration of the five-miniature single-head jack according to the first embodiment. FIG. 5 is a cross-sectional view showing a connection state between the 5-pole small single-head plug and the 5-pole small single-head jack according to the first embodiment.

As shown in FIG. 4, the 5-pole small single-head jack 30 is in conductive contact with the insulating casing 37 indicated by the dotted line in the drawing and the electrodes 11 to 15 of the 5-pole small single-head plug 10. First to fifth conductive terminals 31 to 35 installed at predetermined positions of the housing 37 are provided. The conductive terminals 31 to 35 are made of conductive metal, and each of the conductive terminals 31 to 35 is formed into a shape that presses against each of the electrodes 11 to 15 by elastic force when the plug and the jack are connected. Yes.

Specifically, the contact portions of the respective conductive terminals 31 to 35 are located slightly projecting in the housing space of the core rod of the pentode small single-head plug 10 when the pentode small plug 10 is not inserted, When the five-miniature single-head plug 10 is inserted, the contact portions of the conductive terminals 31 to 35 are pushed back and deformed by the electrodes 11 to 15, thereby generating an elastic force in a direction perpendicular to the axis. The contact portion is in pressure contact with each of the electrodes 11-15. In this way, if the contact portions of the conductive terminals 31 to 35 are in pressure contact with the plug-side electrodes 11 to 15, the conductive contact can be maintained well even if some external force is applied to the plug or jack.

Note that the first conductive terminal 31 includes two first conductive terminals 31-1 and 31-2 so that the first conductive terminal 31 can be held in pressure contact with the steep slope 11b of the first electrode 11 from both sides and more firmly held. I have. In this way, if only a plurality of first conductive terminals 31 are provided, it is possible to greatly suppress the occurrence of plug disconnection while maintaining the small size of the jack.

In addition, as shown in FIG. 5, in the state where the 5-pole small single-head plug 10 is inserted into the 5-pole small single-head jack 30, the first electrode 11 is connected to the two first conductive terminals 31-1, 21-2. The second electrode 12 contacts the second conductive terminal 32, the third electrode 13 contacts the third conductive terminal 33, the fourth electrode 14 contacts the fourth conductive terminal 34, and the fifth electrode 15 contacts the fifth conductive terminal 35. ing.

At this time, the contact portions of the conductive terminals 31 to 35 are pushed back in the direction perpendicular to the insertion direction by the insertion of the five-pole small single-head plug 10, and the direction perpendicular to the axial direction of the five-pole small single-head plug 10. The contact portions of the conductive terminals 31 to 35 are in pressure contact with the electrodes 11 to 15.

Each of the electrodes 11 to 15 according to the present embodiment has a cylindrical shape, and has a conductive contact surface of 360 ° with the conductive terminals 31 to 35 on the jack side. Even if it is inserted into the 5-pole small single-head jack 30 at a rotational position, conductive contact can be realized, and the 5-pole small single-head plug 10 rotates relative to the 5-pole small single-head jack 30 after insertion. Also, the conductive contact state can be maintained.

The 5-pole small single-head plug according to the present embodiment and the 5-pole small single-head jack connected to the 5-pole small single-head plug have been described above in detail. The 5-pole small single-head plug according to the present embodiment is described above. According to the present invention, it is possible to provide a 5-pole small single-head plug capable of preventing contact failure due to plug disconnection while maintaining compatibility with the conventional standardized 2-4 ultra-small single-head plug. .

Of course, the 5-miniature single-head plug according to the first embodiment can be variously modified without departing from the gist of the present invention. For example, in the present embodiment, a 5-pole small single-head plug provided with a 5-pole electrode only on the core rod portion, but in addition to the 5-pole core rod portion, a cylindrical portion provided around the root portion of the core rod It goes without saying that the present invention can be applied even to a multipolar small single-head plug having 6 or more poles, further comprising electrodes on the inner and outer surfaces of the (plug cover).

In addition, the shape of the first electrode has a steep slope of 7 ° to 15 ° that acts as an inclined surface of the plug removal prevention portion, and the parallel surface 11a has an axial length of 10 mm or less, and is a standardized small size. Any other shape can be used as long as it is larger than the plug removal prevention portion of the single-head plug and does not enter the inside. Hereinafter, modified examples of the first electrode will be described with reference to the drawings.

・ Modification 1
FIG. 6 is an enlarged plan view of the first electrode of the five-pole small single-head plug according to the first modification of the first embodiment. The first electrode 11 ′ of Modification 1 is different from the first electrode 11 of the first embodiment in the shape of the steep slope, but the other configurations are the same. The steep slope 11b ′ according to the first modification is not a flat surface, but is formed by a curved surface having a circular cross section with a radius R = 2.5 mm by a plane parallel to the axial direction.

Even if the steep slope 11b ′ is a curved surface instead of a flat surface, if the inclination angle is 7 ° to 15 °, the compatibility with the standard small single-head plug is maintained as in the first embodiment. It is possible to greatly suppress plug disconnection. In the case of a curved surface, the average inclination angle of the entire curved surface may be 7 ° to 15 °.

・ Modification 2
FIG. 7 shows an enlarged plan view of the first electrode of the five-pole small single-head plug according to the second modification of the first embodiment. The first electrode 11 '' of the second modification is different from the first electrode 11 of the first embodiment in the shapes of the bulging portion (parallel surface) and the steep slope portion, but the other configurations are the same. The bulging portion 11a '' according to the second modification is not a parallel surface whose outer surface is parallel to the axial direction, but a reverse inclined surface whose diameter increases toward the root side.

Therefore, in the second modification, the diameter (φ3.2 mm) at the tip end side of the steep slope portion 11b ″ is larger than the diameter (φ3 mm) in the first embodiment, and therefore the inclined surface portion 11b ″. The inclination angle of is larger and formed at 7.7 °. Therefore, according to the second modification, plug disconnection can be further suppressed. In the second modification, the first electrode 11 ″ swells up to a maximum of 0.13 mm mm from the surface of the standard plug removal prevention portion at the boundary between the bulging portion 11a ″ and the steep slope portion 11b ″. Outside)).

(Second Embodiment)
Subsequently, a φ2.5 mm five-pole ultra-small single-head plug according to a second embodiment of the present invention will be described in detail. FIG. 8 is a plan view of a core rod portion of a five-pole ultra-small single-head plug according to the second embodiment. FIG. 9 is a cross-sectional view of a core bar portion of a five-pole ultra-small single-head plug according to the second embodiment.

The 5-pole ultra-small single-head plug according to the second embodiment is also designed with the same gist as the first embodiment, and the shape of the plug is the same, but the single-head according to the second embodiment Since the plug is a 5-pole ultra-small single-head plug of φ2.5 mm, the size and the like are different from those of the first embodiment. Therefore, in the present embodiment, only the configuration different from the first embodiment will be described in detail.

As shown in FIGS. 8 and 9, the core rod of the pentode ultra-small single-head plug 50 according to the second embodiment includes first to fifth electrodes 51 to 55 made of conductive metal, and each electrode 51 to 55. It is composed of insulating collars 61 to 64 made of an insulator for insulating between them. Further, on the base side of the fifth electrode 55, there is provided a knob 68 which is an end face on the plug side which comes into contact with the end face of the jack inlet when inserted into the jack, and the end face on the tip side serves as a reference plane for dimensions. Has been.

The first electrode 51 has substantially the same outer shape as the first electrode of the standardized ultra-small single-head plug, but the shape of the inclined surface of the plug removal prevention portion is different as will be described later. There are some structural differences, including The first electrode of the standard small single-head plug is exposed on the surface of the core rod in the range of 7.2 (6.5 + 0.7) to 11 mm from the reference surface of the knob. The first electrode 11 according to this embodiment is also In the range from 7.2 (6.7 + 0.5) to 11 mm from the reference surface of the knob 28, the surface of the core bar is exposed.

As shown in FIG. 8, the first electrode 51 remains at 2.3 mm from the reference surface of the knob 28 at 7.2 (10-2.8) to 7.6 (10-2.4) mm and remains at 7.6 to 8 (10- 2) It gradually becomes thinner from φ2.3mm to φ1.8mm over mm, and gradually becomes thicker from φ1.8mm to φ2mm over 8 to 9.2 (10-0.8) mm from the reference surface (gentle slope 51c). From 9.2 to 10 mm from the reference surface, it suddenly increases from φ2 mm to φ2.3 mm (steep slope 51b), and from φ10 to 10.3 mm from the reference surface, it remains φ2.3 mm (parallel surface 11a). It has a shape that sharply narrows from φ2.3mm to φ0.9mm over the tip of 11 (10.3 + 0.7) mm.

According to the 5-pole ultra-small single-head plug 50 having such a configuration, it is possible to greatly suppress plug disconnection by the steep slope 51b having an angle steeper than the tilt angle with respect to the axial direction of the inclined surface of the standard plug disconnect prevention portion. Thus, the same operational effects as those of the first embodiment can be obtained.

Here, the inclination angle of the steep slope 51b acting as an inclined surface for preventing plug removal with respect to the plug insertion direction (axial direction) will be considered. If the tolerance is not taken into account, the inclination angle of the inclined surface of the conventional standardized ultra-small single head plug is 6.3 °. In the steep slope 51b according to the present embodiment, it is necessary to tighten the inclination angle more than 6.3 ° in order to suppress the plug disconnection than before, but if the angle is too tight, the compatibility with the standard product is maintained as described above. There is a risk that it will not be possible.

Considering these points, the inclination angle of the steep slope 15b of the five-pole ultra-small single-head plug 50 according to this embodiment with respect to the plug insertion direction is set to 10.6 °. Of course, the angle of the inclined surface of the plug removal preventing portion that can satisfactorily suppress plug removal while ensuring compatibility with standard products is not limited to the above 10.6 °. According to the present inventor, if the inclination angle is 7 ° to 15 °, both compatibility with standard products and prevention of plug disconnection can be achieved.

In the second embodiment, the first electrode 51 is swollen by a maximum of 0.03 mm from the surface of the standard plug removal prevention portion at the boundary between the bulging portion 51a and the steep slope portion 51b (outward). .

In the second embodiment, the parallel surface (bulged portion) 51a has an axial length of 0.3 mm, but the parallel surface 51a may be lengthened to further tighten the inclination angle of the steep slope 11b. In order to prevent the conductive terminal on the jack side from coming into contact with the parallel surface 51a, the thickness is preferably 0.7 mm or less.

Since the parallel surface 51a starts from a position 0.7 mm from the tip, the steep slope 51b that substantially acts as a plug removal prevention surface is configured such that the tip side end is not separated from the tip of the plug 50 by more than 1.4 mm. It is desirable that In the second embodiment, as in the first embodiment, various modifications can be made without departing from the gist of the present invention.

FIG. 1 is a plan view of a core rod portion of a five-miniature single-head plug according to the first embodiment. FIG. 2 is a cross-sectional view of the core rod portion of the five-miniature single-head plug according to the first embodiment. FIG. 3 is an enlarged plan view of the first electrode of the five-miniature single-head plug according to the first embodiment. FIG. 4 is a partial perspective view of the configuration of the 5-miniature single-head jack according to the first embodiment. FIG. FIG. 5 is a cross-sectional view showing a connection state between the 5-pole small single-head plug and the 5-pole small single-head jack according to the first embodiment. FIG. 6 is an enlarged plan view of a first electrode of a five-pole small single-head plug according to Modification 1 of the first embodiment. FIG. 7 is an enlarged plan view of the first electrode of the five-pole small single-head plug according to Modification 2 of the first embodiment. FIG. 8 is a plan view of a core rod portion of a five-pole ultra-small single-head plug according to the second embodiment. FIG. 9 is a cross-sectional view of a core bar portion of a five-pole ultra-small single-head plug according to the second embodiment. FIG. 10 is a diagram showing the dimensions of a two-pole ultra-small single-head plug (φ2.5 mm) defined in JIS C-6560. FIG. 11 is a diagram showing dimensions of a four-pole small single-head plug (φ3.5 mm) defined in JEITA RC-5325A.

Explanation of symbols

10 5-pole small single-head plug 11-15 First to fifth electrodes 21-24 Insulating collar 28 Knob 30 5-pole small single-head jack 31-35 First to fifth conductive terminals 37 Housing 50 5-pole ultra-small single head Plugs 51 to 55 First to fifth electrodes 61 to 64 Insulating collar 68 Knob

Claims

The core rod portion includes first to fifth electrodes that are sequentially exposed from the tip side to the surface, and an insulating collar for insulating the first to fifth electrodes, and the core rod portion is divided into five poles. For multi-pole single-head plugs,
The first electrode has an outer shape substantially the same as the tip electrode provided at the tip of the standardized small single-head plug, and the tip electrode plug prevention portion of the chip electrode of the standardized small single-head plug And a bulging portion that swells outward from the inclined surface of the plug removal prevention portion from the tip side, and a steep slope that is tighter than the inclination angle with respect to the insertion direction of the inclined surface of the plug removal prevention portion. A multi-pole single-head plug comprising a steep slope portion formed with a plug-removing prevention portion provided with a to ensure compatibility with a standardized small single-head plug.
The outer surface of the plug removal prevention portion of the first electrode is configured not to enter more than 0.2 mm inside the inclined surface of the plug removal prevention portion of the chip electrode of the standardized small single-head plug. The multipolar single-head plug according to claim 1.
The multipolar single-head plug according to claim 1 or 2, wherein an inclination angle of the steep slope portion with respect to the insertion direction is 7 to 15 °.
The multipolar single-head plug is a small single-head plug of φ3.5 mm,
4. The multiminiature according to claim 1, wherein the first electrode is configured such that a tip side end portion of the steep slope is not separated by 2 mm or more from a tip end of the core rod portion. 5. Single-head plug.
In the multi-pole single-head jack connected to the multi-pole single-head plug according to claim 1,
A housing,
First to fifth conductive terminals that are in conductive contact while being in pressure contact with the first to fifth electrodes at the time of connection, respectively, and are disposed with the first electrode sandwiched from both sides so as to be in conductive contact at the steep slope portion. A first conductive terminal composed of two conductive terminals, second to fifth conductive terminals composed of a single conductive terminal,
A multi-pole single-headed jack characterized by comprising: