JP5947885B2 - Plug connector, receptacle connector, and coaxial connector composed of these connectors - Google Patents

Description

The present invention relates to a plug connector used for connecting a coaxial cable, and more particularly to a plug connector for connecting an RF module and an antenna in an internal part of an electronic device.
The present invention also relates to a receptacle connector used in communication devices such as smartphones and notebook PCs, electrical devices, and electronic devices.
Furthermore, the present invention does not lead to an increase in board manufacturing costs, and even when the fitting height is about 0.8 mm and is extremely low in height, there is no erroneous fitting and erroneous mounting, and a short circuit etc. The present invention relates to a coaxial connector composed of a plug connector and a receptacle connector, which has a structure in which a stable connection can be obtained.

  For example, a conventional plug connector used in a high frequency band includes a signal conductor (contact or contact) having a contact portion electrically connected to a contact of a mating connector and a connection portion electrically connected to an exposed inner conductor of a coaxial cable. Socket contact), a ground conductor (shell) electrically connected to the outer conductor of the coaxial cable, and an insulator (housing) that is formed integrally with the signal conductor and electrically insulates between the signal conductor and the ground conductor. Or by connecting the exposed inner conductor of the coaxial cable to the upper surface of the signal conductor by soldering, crimping or spring contact structure, and projecting on the inner surface of the ground conductor facing the inner conductor. Provided with a lid that can be rotated at a position facing the top surface of the signal conductor. By bending the ground conductor so that the convex portion of the conductor conductor presses the lid of the insulator, a structure for pressing and holding the signal conductor and the coaxial cable through the pressed lid of the insulator is provided. Have.

  In recent years, a large number of plug connectors have been used in various devices, and there is an increasing demand for further downsizing, particularly low profile, in small and thin smartphones, mobile phones, game machines and the like.

  However, since the conventional plug connector employs a configuration in which a convex portion is provided on the inner surface of the ground conductor in order to press and hold the signal conductor and the coaxial cable, the formation of the convex portion inevitably increases the thickness of the connector itself. In addition, the connection of the exposed inner conductor of the coaxial cable to the upper surface of the signal conductor is performed by soldering, crimping, or a spring contact structure. Therefore, it is necessary to provide the signal conductor with a wall portion having a predetermined height from the upper surface, and in the case of crimping, a space surrounding the inner conductor is required. In some cases, it is necessary to have a structure in which the inner conductor is sandwiched, and in any case, a member having a certain height from the upper surface of the signal conductor should be provided to connect the inner conductor. Is required, in addition, I also phase 俟 that lid provided on the insulator is also required thickness of about at least 0.1 to 0.15 mm, not be said preferable structure in terms of low profile.

  Furthermore, the configuration is adopted in which the exposed inner conductor of the coaxial cable is disposed on the upper surface side of the signal conductor opposite to the lower surface side where the contact portion electrically connected to the contact of the mating connector is located. This configuration is also not preferable from the viewpoint of reducing the height.

  When using a coaxial cable, it is necessary to match the characteristic impedance of the coaxial cable with the characteristic impedance of the mating connector connected by the plug connector. If the characteristic impedance is not matched, a reflected wave is generated at the connection portion of the coaxial cable and the voltage standing wave ratio (VSWR) is increased. In particular, the signal to be transmitted is a high-frequency signal in a high frequency band of GHz level. This is because the value of the inductive reactance becomes so large that it cannot be ignored and the characteristic impedance of the coaxial cable tends not to be maintained.

  For example, Patent Document 1 discloses a plug connector that improves the VSWR while maintaining the characteristic impedance of the coaxial cable even when transmitting a high-frequency signal to the coaxial cable.

  As shown in FIG. 1, the plug connector 101 described in Patent Document 1 includes a signal conductor 103, a ground conductor 105, and an insulator 107, and is connected to a coaxial cable 120 in a coaxial state. The connecting conductor 108 is connected to the mating connector in a direction perpendicular to the axial direction of the cable 120, and the signal conductor 103 is electrically connected to the inner conductor 122 of the coaxial cable 120 and the mating connector, respectively. And a capacitance formed on the distal end side 103a of the signal conductor 103 with a predetermined area capable of changing the axial length of the coaxial cable 120. By providing the adjustment region 110 and using the signal conductor 103 in which the area of the capacitance adjustment region 110 is set large in advance according to the capacitance to be adjusted. Improve VSWR, it has been described that the characteristic impedance of the coaxial cable 120 can be maintained.

  In general, a receptacle connector is mounted on a substrate and is fitted with a plug connector to which a coaxial cable as a mating connector is connected. The receptacle connector includes a central conductor having a contact portion that contacts a socket contact of the plug connector and a connection portion mounted on the substrate, an external portion having a contact portion that contacts the shell of the plug connector and a connection portion mounted on the substrate. A conductor and an insulator for holding the center conductor and the outer conductor are provided.

  Examples of conventional receptacle connectors include Patent Documents 2 and 3.

  Patent Document 2 aims to provide a coaxial connector that can be coupled to a receptacle in a mechanically and electrically stable state and has a low profile, and a socket is connected to a spring contact portion and a central conductor of the coaxial cable. The spring contact portion has a shape obtained by bending a leaf spring having a constant width so that the cross-sectional shape is C-shaped, and when the central conductor of the receptacle is press-fitted, Displaced radially outward, the spring contact portion is pressed against the outer peripheral surface of the center conductor, the connection portion is bent in a direction perpendicular to the central axis direction of the spring contact portion, and the coaxial cable is connected to the connection portion. A coaxial connector having a structure in which a tip end portion of a center conductor is connected by caulking is disclosed.

  In Patent Document 3, the contact between the contact piece and the mating terminal is made into a multi-point contact to stabilize the contact, to facilitate the positioning of the contact position between the terminals, and to be easy to process and inexpensive to manufacture. A connector and a terminal for a coaxial connector used for the same, a terminal connected to a central conductor of a coaxial cable and the like, and a plurality of contact pieces extending in a fitting direction with a mating terminal; A concave portion is formed along the fitting direction in at least a contact portion of at least one inner surface of the plurality of contact pieces with the mating terminal, and an insulator for holding such a terminal and an insulator are accommodated. A coaxial connector including an outer conductor connected to a shielded wire of a coaxial cable is disclosed.

Japanese Patent No. 3,822,871 JP-A-11-307158 JP 2009-59500 A

  However, the plug connector 101 described in Patent Document 1 can only adjust the characteristic impedance value from a high characteristic impedance value to a low impedance value, and other conventional ones are provided on the distal end 103a side of the signal conductor 103. It is necessary to additionally provide a capacitance adjustment region 110 that does not need to be provided in the plug connector so as to have a certain area obtained by extending the length and width, and this constitutes the signal conductor 103. As a result, the amount of the metal material used is increased, resulting in an increase in product cost.

  Further, in the plug connector 101 described in Patent Document 1, the characteristic impedance of the coaxial cable 120 is maintained by changing the area, particularly the length dimension, of the capacitance adjustment region 110 provided on the distal end 103a side of the signal conductor 103. The adjustment is made so that the area of the capacitance adjustment region 110, in particular, the range in which the length can be increased, is naturally limited by the internal dimensions of the plug connector 101, and therefore the capacitance is narrow. On the other hand, in order to widen the adjustment range of the capacitance, there is only a method of greatly changing the external dimensions of the plug connector 101, which is not desirable from the viewpoint of miniaturization of the connector.

  Furthermore, in the plug connector 101 described in Patent Document 1, the exposed inner conductor 122 of the coaxial cable 120 is arranged on the upper surface 103a side of the signal conductor 103 of the plug connector 101, in other words, the signal conductor 103 and the ground conductor 105. And an inner conductor gripping portion (not shown) having a certain height dimension is provided on the upper surface 103a of the signal conductor 103, so that it is necessary to further reduce the height of the conductor. This is not a desirable configuration.

  An object of the present invention is to optimize the two conductor facing areas in which the ground conductor and the signal conductor are opposed to each other without changing the external dimensions of the connector, and for the signal conductor and the ground. Adjustment to maintain the characteristic impedance of the coaxial cable by improving the VSWR without increasing the amount of conductive material that constitutes the conductor, especially from a low characteristic impedance value to a high impedance value. Another object of the present invention is to provide a plug connector used for connecting a coaxial cable, particularly a plug connector for connecting an RF module and an antenna in an internal part of an electronic device, which can achieve a low profile.

  In recent years, communication devices, electrical devices, electronic devices, and the like have been miniaturized and connectors have been miniaturized, and the demand for ultra-low profile when two connectors are mated has increased.

  However, when a connector having a connector system (a system including a central conductor, an insulator, and an external conductor) as described in Patent Document 2 and Patent Document 3 is used when the height of the connector is reduced, In addition, the connection portion between the ground conductor (shell) of the plug connector and the central conductor of the receptacle connector is easily touched, which may cause a connection failure. Further, in the structures of Patent Document 2 and Patent Document 3, it has been difficult to achieve an ultra-low profile with a fitting height of about 0.8 mm. That is, since it is necessary to secure a certain distance between the shell of the plug connector and the connecting portion of the central conductor of the receptacle connector, it is engaged with the shell of the plug connector at a substantially central portion of the outer conductor of the receptacle connector. Since they are in contact with each other, the fitting height is high.

  Another object of the present invention has been made in view of such conventional problems, and does not lead to an increase in the cost of board production, and the fitting height can be reduced to about 0.8 mm, resulting in erroneous fitting. The present invention provides a plug connector, a receptacle connector, and a coaxial connector composed of these connectors, which are free from defects such as short-circuits and provide a stable connection.

In order to achieve the above object, the gist of the present invention is as follows.
(1) A signal conductor made of a conductive material, having a contact portion electrically connected to the contact of the mating connector and a connection portion electrically connected to the exposed inner conductor of the coaxial cable, and made of the conductive material, the coaxial A grounding conductor that is electrically connected to the outer conductor of the cable, and an insulator made of an electrically insulating material, integrally formed with the signal conductor, and electrically insulating between the signal conductor and the grounding conductor. In the plug connector, the two conductor facing regions in which the ground conductor and the signal conductor are arranged to face each other for adjustment to match a predetermined impedance value when viewed in a cross section including the longitudinal direction of the signal conductor In addition, the vertical distance between the inner surface of the ground conductor and the rear surface of the signal conductor facing the inner surface is increased without increasing the thickness dimension of the connector. Distance expansion section Ri Na to form, at least the distance expansion section, while maintaining the planar state without protrusion is formed on an outer surface of the ground conductor, was formed on the inner surface of the ground conductor 1 The concave portion is provided, and the impedance value can be increased and adjusted in proportion to the depth of the concave portion, and the connecting portion of the signal conductor has a width 1 to 5 times the diameter of the inner conductor of the coaxial cable. is configured as a flat plate having dimensions, plug connector, wherein Rukoto said is electrically connected to the exposed inner conductor was in the coaxial cable by soldering.

(2) The plug connector according to (1), wherein the exposed internal conductor of the coaxial cable is positioned on the opposite side of the ground conductor with the signal conductor interposed therebetween.

(3) The contact portion of the signal conductor is located at a predetermined distance in the longitudinal direction of the signal conductor with respect to the tip of the inner conductor of the coaxial cable connected to the connection portion. Plug connector.

( 4 ) The distance enlarging portion is formed by providing a plurality of recesses in the ground conductor, and the ground conductor is located between the recesses and extends across the longitudinal direction of the signal conductor. The plug connector according to any one of (1) to (3), wherein the plug connector has a thick partition portion.

( 5 ) Any one of said (1)-( 4 ) characterized by providing a through-hole in the front end side of the conductor for ground | ground, and providing the protrusion which can be positioned and inserted in the said through-hole in an insulator. Plug connector as described in.

( 6 ) A receptacle connector that is detachably fitted to a plug connector to which a coaxial cable is connected, a contact portion that contacts a signal conductor of the plug connector, and a central conductor that has a connection portion mounted on a substrate; In a receptacle connector comprising: a main body portion that contacts a ground conductor of the plug connector; an outer conductor having a connection portion mounted on a substrate; and an insulator that holds the center conductor and the outer conductor . the main body, engages the ground conductor of the plug connector at its front end, an engaging portion having a folded shape on the outside provided in the outer conductor, and the engaging portion and the connecting portion The portion of the body portion in between is covered with the insulator, and the insulator is provided with a recess in a portion where the connection portion of the central conductor protrudes, Receptacle connector part of the serial central conductors, in the recess, and characterized that you position so as not to contact with the ground conductor at the fitting state between the plug connector.

( 7 ) By providing a plurality of slits in the outer conductor, the outer periphery of the outer conductor is formed by a plurality of plate-like pieces, and engages with the ground conductor of the plug connector at the tip of the plate-like piece. The receptacle connector as described in ( 6 ) above, wherein at least one engagement portion bent outward is provided.

( 8 ) By providing eight slits in the outer conductor, the outer periphery of the outer conductor is formed by eight plate-like pieces, and the ground of the plug connector is attached to the tip of the plate-like piece every other piece. The receptacle connector as described in ( 7 ) above, wherein an engagement portion bent outward is provided to engage with the conductor.

(9) said receptacle connector, said center conductor, said above, characterized in that the outer conductor and ones formed by integrally molding the insulator (6), (7) or (8), wherein the receptacle connector .

( 10 ) A coaxial connector comprising the plug connector according to any one of (1) to ( 5 ) above and the receptacle connector according to any one of ( 6 ) to ( 9 ) above.

  According to the present invention, by optimizing the two conductor facing areas in which the ground conductor and the signal conductor are arranged to face each other, the signal conductor and the ground are not changed without changing the external dimensions of the connector. Adjustment to maintain the characteristic impedance of the coaxial cable by improving the VSWR without increasing the amount of conductive material that constitutes the conductor, especially from a low characteristic impedance value to a high impedance value. It is possible to provide a plug connector used for connecting a coaxial cable, particularly a plug connector for connecting an RF module and an antenna in an internal part of an electronic device, which can reduce the height. became.

The receptacle connector of the present invention can provide the following excellent effects.
(1) A receptacle connector of the present invention is a receptacle connector that is detachably fitted to a plug connector to which a coaxial cable is connected, a contact portion that contacts a signal conductor (socket contact) of the plug connector, and a substrate A central conductor having a connecting portion to be mounted on, a contact portion in contact with a ground conductor (shell) of the plug connector, an external conductor having a connecting portion to be mounted on a substrate, and holding the central conductor and the external conductor. In the receptacle connector provided with an insulator, the insulator is provided with a recess in a portion where the connection portion of the center conductor protrudes, and the connection portion of the center conductor is located in the recess, and the external conductor Is provided with an engaging portion bent outward so as to engage with the ground conductor (shell) of the plug connector. This does not lead to an increase in board manufacturing costs, the fitting height can be reduced to about 0.8 mm, there is no erroneous fitting or mounting, and the fitting height is extremely low (center) A stable connection can be obtained without defects such as a short circuit (even if the distance between the conductor connection portion and the ground conductor (shell) of the plug connector is short).

(2) In the receptacle connector of the present invention, the outer conductor is further provided with a plurality of slits so that the outer periphery of the outer conductor is formed of a plurality of plate-like pieces, and the plug connector is connected to the tip of the plate-like piece. Providing at least one engagement portion bent outwardly to engage with the ground conductor (shell), more preferably, providing the outer conductor with eight slits, Are formed by eight plate-like pieces, and an engagement portion bent outward is provided at the tip of the plate-like piece to be engaged with the ground conductor (shell) of the plug connector every other piece. Thus, elasticity is obtained and a more stable connection is obtained.

(3) In the receptacle connector of the present invention, the effect of the above (1) can be surely obtained by further holding the center conductor and the outer conductor on the insulator by integral molding.

  In addition, if the coaxial connector constituted by the plug connector and the receptacle connector of the present invention described above is used, the fitting height can be reduced to about 0.8 mm without causing an increase in board manufacturing cost, No improper mounting, and stable even without a short circuit or other defects, even when the height of the fitting is very low (even if the distance between the center conductor connection and the plug connector ground conductor (shell) is short) Connection is obtained.

FIG. 1 is a longitudinal sectional view of a conventional plug connector, and shows a state where it is connected to a coaxial cable. FIG. 2 is a longitudinal cross-sectional view of an exemplary plug connector according to the present invention, shown connected to a coaxial cable. 3 (a) and 3 (b) are perspective views of the plug connector of FIG. 2, where FIG. 3 (a) is viewed from the back side and FIG. 3 (b) is viewed from the front side. . FIG. 4 is an exploded perspective view of the plug connector shown in FIG. 5 (a) and 5 (b) are perspective views showing only the ground conductor extracted from the plug connector of FIG. 1, and FIG. 5 (b) when FIG. 5 (a) is viewed from the inner surface side. Is when viewed from the outside. 6 (a) and 6 (b) are perspective views showing only the signal conductor extracted from the plug connector of FIG. 1, and FIG. 6 (b) shows the case where FIG. 6 (a) is viewed from the lower surface side. Is when viewed from the top side. FIG. 7 is a plan view of another ground conductor constituting the plug connector of the present invention. FIG. 8 is a plan view of another ground conductor constituting the plug connector of the present invention. FIG. 9 is a plan view of another ground conductor constituting the plug connector of the present invention. FIG. 10 is a plan view of another ground conductor constituting the plug connector of the present invention. FIG. 11 is a plan view of another ground conductor constituting the plug connector of the present invention. 12A is a perspective view of the receptacle connector as viewed from the mating side, FIG. 12B is a perspective view of the receptacle connector as viewed from the board connection side, and FIG. 12C is a perspective view of the plug connector. It is the perspective view seen from the fitting side. FIG. 13A is a cross-sectional view of the plug connector and the receptacle connector in a state where the plug connector and the receptacle connector are fitted, and FIG. 13B is a cross-sectional view in a state where the plug connector and the receptacle connector are fitted. FIG. FIG. 14A is a perspective view of the center conductor before insert molding as viewed from the contact portion side, and FIG. 14B is a perspective view of the center conductor before insert molding as viewed from the connection portion side. FIG. 15A is a perspective view of the outer conductor before insert molding as viewed from the fitting side, and FIG. 15B is a perspective view of the outer conductor before insert molding as viewed from the connection portion side. 16A is a perspective view of the insulator in a state where the center conductor and the outer conductor are not insert-molded, as viewed from the fitting side, and FIG. 16B is a diagram where the center conductor and the outer conductor are not insert-molded. It is the perspective view which looked at the insulator of a state from the connection side. 17A is a perspective view of another external conductor of the present invention before insert molding as seen from the fitting side, and FIG. 17B is a receptacle connector using the external conductor of FIG. FIG. 17C is a perspective view of the receptacle connector using the outer conductor of FIG. 17A as viewed from the board connection side. 18A is a perspective view of the signal conductor (socket contact) of the plug connector as viewed from the contact portion side, and FIG. 18B is a perspective view of the signal conductor as viewed from the connection portion side. FIG. 19A is a perspective view of the plug connector after crimping when the ground conductor (shell) is viewed with the mating side facing forward, and FIG. 19B is the mating side of the ground conductor after crimping. It is the perspective view seen in the state which turned back. 20A is a perspective view of the plug connector insulator (block) as viewed from the fitting side, and FIG. 20B is a perspective view of the plug connector insulator as viewed from the connection side. FIG. 21A is a perspective view of another insulator of the present invention as seen from the fitting side in a state where the center conductor of the receptacle connector and the outer conductor of FIG. FIG. 18 is a perspective view of the insulator in a state where the center conductor and the outer conductor of FIG. 17A are not insert-molded from the connection side.

  Next, an embodiment of a plug connector according to the present invention will be described below with reference to the drawings. FIG. 2 shows a typical plug connector according to the present invention. FIGS. 3A and 3B are perspective views of the plug connector shown in FIG. 2, and FIG. 3 (b) is a view from the front side, FIG. 4 is an exploded perspective view of the plug connector shown in FIG. 2, and FIGS. 5 (a) and 5 (b) are diagrams. FIG. 5A is a perspective view showing only the ground conductor extracted from the plug connector shown in FIG. 2 when FIG. 5A is viewed from the inner surface side, and FIG. 6 (a) and 6 (b) are perspective views showing only the signal conductor extracted from the plug connector of FIG. 2, and when FIG. 6 (a) is viewed from the lower surface side, FIG. This is the case when viewed from the upper surface side.

  The plug connector 1 shown in FIGS. 2 to 4 is a plug connector that can be used even in a high frequency range up to 6 GHz, for example, and is mainly composed of a signal conductor 3, a ground conductor 5, and an insulator 7. ing.

  The signal conductor 3 is made of a conductive material such as an iron, aluminum, copper metal, or an alloy material such as beryllium copper, titanium copper, etc., and in order to further increase the conductivity, the metal plate is plated with gold or silver. You may use what gave a surface treatment film like these.

  The signal conductor 3 includes a contact portion 9 into which a contact (not shown) of a mating connector (not shown) is inserted and electrically connected, and a connection portion electrically connected to the exposed internal conductor 22 of the coaxial cable 20. 11.

  The contact portion 9 is configured as a pair of claw-like portions 9 a and 9 b that are bent in a direction approaching each other from the flat portion of the signal conductor 3 toward the lower surface 3 b side.

  The connecting portion 11 is a portion of the signal conductor 3 that is formed as a flat portion on the signal conductor 3 and is connected to the inner conductor 22 of the coaxial cable 20 by soldering or the like. As in Document 1, it is not necessary to dispose a wall portion having a certain height in the signal conductor in order to grip the inner conductor of the coaxial cable.

  The ground conductor 5 is made of a conductive material such as an iron, aluminum, copper metal, or an alloy material such as a beryllium copper alloy or a titanium copper alloy. In FIGS. 5A and 5B, a single metal is used. It is shown as a press-formed product of a plate and is provided for electrical connection to the outer conductor 24 of the coaxial cable 20.

  The insulator 7 is made of an electrically insulating material such as a synthetic resin material such as polybutylene terephthalate (PBT), polyamide (PA), polyphenylene sulfide (PPS), liquid crystal polymer (LCP), and the like. In addition, it is configured as an integrally molded product, and is disposed to electrically insulate between the signal conductor 3 and the ground conductor 5.

  The main feature of the configuration of the present invention is to optimize both the conductor facing regions 13 in which the ground conductor 5 and the signal conductor 3 are arranged to face each other. More specifically, When the cross section including the longitudinal direction L of the signal conductor 3 is viewed, a plug is connected to the two conductor facing regions 13 where the ground conductor 5 and the signal conductor 3 are arranged to face each other for adjustment to increase to a predetermined impedance value. Without increasing the thickness dimension t of the connector 1, the distance expanding portion 15 that increases the vertical distance X between the inner surface 5 a of the ground conductor 5 and the upper surface 3 a of the signal conductor 3 facing the inner surface 5 a is provided. By adopting this configuration, it is possible to improve the VSWR coaxially without changing the external dimensions of the connector and without increasing the amount of conductive material constituting the signal conductor and the ground conductor. cave The characteristic impedance of the cable 20 can be adjusted to be maintained, and the height can be reduced.

  Further, when it is necessary to reduce the height of the connector of the present invention, the exposed inner conductor 22 of the coaxial cable 20 is opposite to the ground conductor 5 with the signal conductor 3 interposed therebetween, that is, It is preferable to employ a configuration in which the signal conductor 3 is positioned on the lower surface 3b side.

  In this case, the contact portion 9 of the signal conductor 3 is positioned at a predetermined distance d in the longitudinal direction L of the signal conductor 3 with respect to the tip 22a of the inner conductor 22 of the coaxial cable 20 connected to the connection portion 11. It is preferable.

  In addition, as shown in FIG. 2, the two conductor facing regions 13 where the ground conductor 5 and the signal conductor 3 are opposed to each other are grounded as viewed in a cross section including the longitudinal direction L of the signal conductor 3. This is a region where the inner surface 5a of the conductor 5 and the upper surface 3a of the signal conductor 3 are arranged to face each other, specifically, a length region in which the signal conductor 3 extends in the longitudinal direction.

  Further, the distance expanding portion 15 has a vertical distance X between the inner surface 5a of the ground conductor 5 and the upper surface 3a of the signal conductor 3 facing the inner surface 5a without increasing the thickness dimension t of the plug connector 1. For example, it is preferable to form at least one recess 17 on at least one of the inner surface 5a of the ground conductor 5 and the upper surface 3a of the signal conductor 3, as shown in FIG. Shows an example formed by two concave portions 17 formed on the inner surface 5 a of the ground conductor 5.

  The distance expanding portion 15 is a portion in which the vertical distance X between the signal conductor 3 and the ground conductor 5 is increased, and may be a space in which there is no insulator or an insulator 7 between them. . Comparing the case where the distance enlargement part is an insulator and the case where it is a space, the space itself has an impedance adjustment effect, the vertical distance X can be shortened, and also in terms of pass characteristics and reflection characteristics. It is advantageous.

  The design of the recesses 17 can be changed as appropriate according to the amount of adjustment of the characteristic impedance value.

  When the concave portion 17 is provided on the inner surface 5 a of the ground conductor 5, the concave portion 17 is provided on the inner surface portion of the ground conductor 5 facing the upper surface 3 a of the signal conductor 3. This is preferable in that the adjustment amount of the value of the characteristic impedance can be increased as compared with the case where it is provided on the inner surface portion other than the inner surface portion of the ground conductor 5 facing the upper surface 3a.

  The number of the concave portions 17 is not particularly limited, and one concave portion 17 may be provided in the ground conductor 5 as shown in FIG. 8, but when the concave portion 17 is provided in the ground conductor 5, a plug is provided. From the viewpoint of securing the strength of the connector 1, the distance expanding portion 15 is provided with a plurality of recesses, for example, two recesses 17, 17 in FIGS. 2 and 9, and three recesses 17, 17, 17 in FIGS. In FIG. 11, it is divided into four recesses 17, 17, 17, 17, and the ground conductor 5 is located between the adjacent recesses 17, 17 and crosses the longitudinal direction L of the signal conductor 3. It is preferable to have a thick partition portion 19 extending in the direction.

  The arrangement shape of the recess 15 is preferably formed so as to maintain a flat state without forming a projection on the outer surface 5b of the ground conductor 5 in order to achieve a low profile.

  The depth of the recess 17 is preferably 0.2 to 0.6 times the thickness of the ground conductor 5. If the depth of the recess 17 is less than 0.2 times the thickness of the ground conductor 5, the impedance adjustment area tends to be small, and if it exceeds 0.6, the strength of the connector is sufficient. In addition to being unable to be obtained, it tends to be difficult to manufacture due to press working.

  Note that the amount of adjustment of the value of the characteristic impedance is such that when the concave portion is provided only in the width region of the inner surface portion of the ground conductor 5 facing the upper surface 3a of the signal conductor 3, the signal conductor 3 and the ground conductor. 5 is substantially proportional to the total volume of the insulators and / or spaces located between 5, for example, if the total value of the inner volumes of all the disposed recesses is the same, the number of disposed recesses Regardless of the depth dimension, the adjustment amount of the characteristic impedance value is considered to be the same.

  As an example, the depth of the concave portion of the ground conductor provided with the three concave portions shown in FIG. 7 is 0 mm (no concave portion), 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm. Table 1 shows the simulation results of the characteristic impedance value (Ω) of the plug connector.

  From the results in Table 1, it can be seen that the adjustment amount of the characteristic impedance value can be adjusted by changing the depth of the concave portion provided in the ground conductor 5. Although not shown in Table 1, it was also obtained as a result of this simulation that the fluctuation width of the characteristic impedance value becomes smaller as the depth of the concave portion is increased.

  Further, in the present invention, by providing the distance enlarging unit 15, the characteristic impedance value can be adjusted to be increased. However, if the characteristic impedance value needs to be decreased, the plug can be adjusted. If it is within the range of the standard dimensions of the connector, it is preferable to employ a configuration in which the signal conductor 3 is provided with a characteristic impedance adjusting portion having a predetermined area extending toward the tip 3a. By adopting this configuration, it is possible to perform either adjustment for increasing the value of the characteristic impedance or adjustment for reducing the value of the characteristic impedance.

  In addition, the connecting portion 11 of the signal conductor 3 is preferably configured as a flat plate shape having a width of 1 to 5 times the diameter of the inner conductor 22 of the coaxial cable 20. If the width dimension of the connecting portion 11 is less than one time the diameter of the inner conductor 22 of the coaxial cable 20, it becomes difficult to reliably solder the inner conductor 22 onto the connecting portion 11 of the signal conductor 3. This is because when the width dimension is larger than five times the diameter of the inner conductor 22 of the coaxial cable 20, there is a problem that the impedance is lowered. Furthermore, providing the through hole 23 on the front end side of the ground conductor 5 and providing the insulator 7 with the protrusion 21 that can be positioned and inserted into the through hole 23 further reduces the height of the plug connector 1. It is suitable for aiming at.

Next, an embodiment of a receptacle connector according to the present invention will be described.
A feature of the present invention is a receptacle connector 220 that is detachably fitted to a plug connector 40 to which a coaxial cable is connected, a contact portion 241 that contacts a signal conductor (socket connector) 44 of the plug connector 40, and A central conductor 224 having a connection portion 243 mounted on the substrate, a contact portion that contacts the ground conductor (shell) 46 of the plug connector 40, an external conductor 26 having a connection portion 263 mounted on the substrate, and the central conductor. In the receptacle connector 220 including the H.224 and the insulator 222 that holds the outer conductor 26, the insulator 222 is provided with a recess 221 at a portion where the connecting portion 243 of the center conductor 224 protrudes, and the center conductor 224 is provided. The connecting portion 243 is located in the concave portion 221, and the outer conductor 26 is connected to the outer conductor 26. An engaging portion 266 that is bent outward to engage with the ground conductor 46 is provided at the tip thereof, and the fitting height between the plug connector 40 and the receptacle connector 220 at the time of fitting is extremely low. A receptacle connector characterized by this.

  That is, the engaging portion 266 that is the distal end portion of the outer conductor 26 and the engaging portion 464 that is the distal end portion of the ground conductor 46 are engaged and contacted, and the central conductor 224 and the outer conductor 26 are integrated. By holding the insulator 222 by molding, the fitting height when fitting both the connectors 220 and 40 is about 0.8 mm, and the connecting portion 243 of the central conductor 224 of the insulator 222 protrudes. A concave portion 221 is provided in the concave portion 221, and the ground conductor 46 does not come into contact with the connecting portion 243 when the connectors 220 and 40 are fitted in the concave portion 221.

  An embodiment of a receptacle connector according to the present invention will be described below with reference to the drawings. 12A is a perspective view of the receptacle connector as viewed from the mating side, FIG. 12B is a perspective view of the receptacle connector as viewed from the board connection side, and FIG. 12C is from the mating side. It is the perspective view of the plug connector which looked. FIG. 13A is a cross-sectional view in a state where the plug connector and the receptacle connector are fitted and obliquely cut in a 45-degree direction, and FIG. 13B is a longitudinal section in a state where the plug connector and the receptacle connector are fitted. FIG. FIG. 14A is a perspective view of the center conductor before insert molding as seen from the contact portion side, and FIG. 14B is a perspective view of the center conductor before insert molding as seen from the connection portion side. FIG. 15A is a perspective view of the outer conductor before insert molding as seen from the fitting side, and FIG. 15B is a perspective view of the outer conductor before insert molding as seen from the connection portion side. FIG. 16A is a perspective view of the insulator in a state where the center conductor and the outer conductor are not insert-molded from the fitting side, and FIG. 16B is a diagram in which the center conductor and the outer conductor are not insert-molded. It is the perspective view which looked at the insulator of a state from the connection part side. 17A is a perspective view of another external conductor of the present invention before insert molding as seen from the fitting side, and FIG. 17B is a receptacle connector using the external conductor of FIG. FIG. 17C is a perspective view of the receptacle connector using the outer conductor of FIG. 17A as viewed from the board connection side. 18A is a perspective view of the signal conductor (socket contact) of the plug connector as viewed from the contact portion side, and FIG. 18B is a perspective view of the signal conductor as viewed from the connection portion side. FIG. 19A is a perspective view of the plug connector after crimping when the ground conductor (shell) is viewed with the mating side facing forward, and FIG. 19B is the mating side of the ground conductor after crimping. It is the perspective view seen in the state which turned back. 20A is a perspective view of the plug connector insulator (block) as viewed from the fitting side, and FIG. 20B is a perspective view of the plug connector insulator as viewed from the connection side. FIG. 21A is a perspective view of another insulator of the present invention as seen from the fitting side in a state where the center conductor of the receptacle connector and the outer conductor of FIG. FIG. 18 is a perspective view of the insulator in a state where the center conductor and the outer conductor of FIG. 17A are not insert-molded from the connection side.

  The receptacle connector 220 of this embodiment includes at least a central conductor 224, an insulator 222, and an external conductor 26. On the other hand, the plug connector 40 as a mating connector mainly includes a signal conductor (socket contact) 44, a block (insulator) 42, and a ground conductor (shell) 46.

  Before describing the receptacle connector 220 of the present invention, the coaxial cable 80 connected to the plug connector 40 will be described. The coaxial cable 80 is composed of an inner conductor at the center, an insulator that is an insulator covering the inner conductor, a braid that is an outer conductor that covers the insulator, and an outer skin that is an insulator that covers the braid. Yes.

  Before describing the receptacle connector 220 of the present invention, a substrate on which the receptacle connector 220 is mounted will be described. The board includes a hard board and an FPC (flexible printed board). Here, the hard substrate will be described. The substrate includes a land to which the connection portion 243 of the central conductor 224 and the connection portion 263 of the external conductor 26 are connected, and a pattern connected to the circuit from the land. In the land surface treatment, the connecting portion 243 of the central conductor 224 and the connecting portion 263 of the outer conductor 26 are merely connected by soldering, and therefore it is not necessary to perform gold plating.

  First, the center conductor 224 constituting the receptacle connector 220 will be described. The center conductor 224 is made of metal and is manufactured by a known press working. The material of the center conductor 224 is required to be springy or conductive, and examples thereof include beryllium copper and phosphor bronze.

  The central conductor 224 has at least a contact portion 241 that contacts the signal conductor 44 of the plug connector 40 and a connection portion 243 that is mounted on the substrate. In this embodiment, the central conductor 224 is held by the insulator 222 by integral molding. As a method of holding the center conductor 224 to the insulator 222, any method may be used as long as the center conductor 224 can be held, and press-fitting, welding, hooking, or the like may be used. The holding method is appropriately designed in consideration of the low profile of the connector, holding force, elasticity, strength, workability, and the like.

  The contact portion 241 of the center conductor 224 is a portion that contacts the signal conductor 44 of the plug connector 40. In this embodiment, the contact portion 241 is easy to contact the signal conductor 44 and can be stably connected. It has a substantially cylindrical shape. The inside is made hollow due to processing and material costs.

  The connecting portion 243 is a portion that is connected to the substrate. In this embodiment, the connecting portion 243 is a substantially plate-like piece and is mounted on the substrate by surface mounting (SMT). The connection part 243 may be a dip type as long as it can be mounted on the substrate. The shape and size of the connecting portion 243 is appropriately designed in consideration of a low connector height, a board mounting area, mounting strength, workability, and the like.

  Next, the outer conductor 26 will be described. The outer conductor 26 is made of metal and is manufactured by a known press working. The material of the external conductor 26 is required to be springy or conductive, and examples thereof include beryllium copper and phosphor bronze. The outer conductor 26 has a main body portion 261 and a connection portion 263 when roughly classified.

  The connection portion 263 of the external conductor 26 is a portion connected to the substrate. In this embodiment, the connection portion 263 is a substantially plate-like piece and is mounted on the substrate by surface mounting (SMT). In the present embodiment, the connection portion 263 is provided to be connected to the main body portion 261 in three directions other than the connection portion 243 of the center conductor 224 protruding. The connection portion 263 may be mounted on the substrate and may be a dip type. The shape and size of the connection portion 263 is appropriately designed in consideration of a low profile of the connector, a board mounting area, mounting strength, workability, and the like.

  Ideally, the main body portion 261 has a cylindrical shape, and an engagement portion 266 bent outward is provided at a tip portion of the main body portion 261 so as to engage with the engagement portion 464 of the ground conductor 46. ing. The engaging portion 266 is provided on the entire circumference of the tip portion, and may have any shape as long as it can engage and contact. The shape and size of the engaging portion 266 is appropriately designed in consideration of a reduction in the height of the connector, connection stability (contact stability), holding force during fitting, workability, and the like. In consideration of the reduction in the height of the connector, the main body 261 is provided at the tip portion.

  In this embodiment, the outer conductor 26 is held by the insulator 222 by integral molding. As a method of holding the outer conductor 26 to the insulator 222, any method may be used as long as the outer conductor 26 can be held, and press fitting, welding, hooking, or the like may be used. The holding method is appropriately designed in consideration of the low profile of the connector, holding force, elasticity, strength, workability, and the like.

  The main body 261 and the insulator 222 form a fitting port 212 into which the plug connector 40 is inserted. The fitting port 212 only needs to contain the plug connector 40 to obtain a stable connection, and the shape and size of the fitting port 212 are in line with the shape and size of the plug connector 40. Design appropriately considering low profile and strength.

  Considering the connection stability (contact stability) and the holding force at the time of fitting, the above shape is ideal. In consideration of workability, another external conductor 26 will be described with reference to FIG. Here, a different part from the outer conductor 26 mentioned above is demonstrated. The different part is the shape of the main body 461.

  By providing a plurality of slits 265 in the main body 261 of the outer conductor 26, the outer periphery of the outer conductor 26 is formed by a plurality of plate-like pieces 264, and the ground conductor 46 is formed at the tip of the plate-like piece 264. At least one engaging portion 266 that is bent outwardly to engage with the locking portion 464 is provided. In this embodiment, by providing eight slits 265 in the outer conductor 26, the outer periphery of the outer conductor 26 is formed by eight plate-like pieces 264, and every other piece of the plate-like piece 264 is formed. The engaging portion 266 bent outward is provided at the tip to engage with the engaging portion 464 of the ground conductor 46. The position, number, and size of the slits 265 (in other words, the position, number, and size of the plate-like pieces 264) are such that the connector is extremely low in profile, workability, connection stability (contact stability), It is designed appropriately in consideration of the holding force at the time of fitting.

  Next, the insulator 222 will be described with reference to FIG. The insulator 222 is an electrically insulating plastic, and is manufactured by a known technique of injection molding. The material is appropriately selected in consideration of dimensional stability, workability, cost, etc. Generally, polybutylene is used. Examples thereof include terephthalate (PBT), polyamide (66PA, 46PA), liquid crystal polymer (LCP), polycarbonate (PC), polyphenylene sulfide (PPS), and synthetic materials thereof. In view of heat resistance, it is preferable to use polyamide, liquid crystal polymer, polyphenylene sulfide, etc. for mounting on a substrate. The central conductor 224 and the outer conductor 26 are attached to the insulator 222 by integral molding.

  The insulator 222 has a substantially rectangular parallelepiped shape, and a recess 221 is provided at a position corresponding to the connection portion 243 of the center conductor 224. The size of the concave portion 221 is such that the connecting portion 243 can be mounted on the substrate and does not protrude. The role of the concave portion 221 is to prevent the ground conductor 46 and the connection portion 243 from coming into contact with the plug connector 40, that is, the fitting height is lowered. However, even if the distance between the connecting portion 243 of the center conductor 224 and the ground conductor 46 of the plug connector 40 is short, a connection failure such as a short circuit does not occur. Furthermore, it becomes a standard when mounting on the board. The size and shape of the recesses are appropriately designed in consideration of the above role, the ultra-low profile of the connector, the board mounting area, workability, strength, and the like.

  Based on FIG. 21, an insulator 222 different from FIG. 16 will be described. Here, only differences will be described. The difference is that a through-hole for escaping the engaging portion 266 of the outer conductor 26 shown in FIG. 17A during integral molding is provided.

  Hereinafter, the plug connector 40 which is the mating connector will be described somewhat. The plug connector 40 includes at least a block 42 that is an insulator, a signal conductor 44 that contacts the central conductor 224, and a ground conductor 46 that contacts and engages the external conductor 26.

  First, the signal conductor 44 will be described. The signal conductor 44 is made of metal and is manufactured by a known press working. Since the signal conductor 44 is required to have springiness or conductivity, beryllium copper or phosphor bronze can be used.

  The signal conductor 44 has at least a contact portion 441 that contacts the central conductor 224 and a connection portion 443 that connects to the cable 80. In this embodiment, the signal conductor 44 is held by the block 42 by integral molding. As a method for holding the signal conductor 44 to the block 42, any method may be used as long as the signal conductor 44 can be held, and press fitting, welding, hooking, or the like may be used. The holding method is appropriately designed in consideration of holding force, elasticity, strength, workability, and the like.

  As shown in FIG. 18, the contact portion 441 of the signal conductor 44 has two plate-like pieces arranged in parallel (so-called socket shape), and has a curved end portion between the two plate-like pieces. The center conductor 224 is inserted for connection. The shape and size of the contact portion 441 may be designed as appropriate in consideration of connection stability, ultra-low connector height, workability, and the like.

  The connecting portion 443 is a portion connected to the inner conductor of the coaxial cable 80, and in the present embodiment, is formed into a plate-like piece and connected by welding. In this embodiment, the coaxial cable 80 is connected by welding. However, any method may be used as long as the coaxial cable 80 can be connected to the connection portion 443, and examples thereof include soldering, pressure welding, and pressure bonding. The shape and size of the connection portion 443 is appropriately designed according to the connection method, holding strength, connection stability, workability, and the like. As in this embodiment, the connection by welding is advantageous in reducing the height of the connector at the time of fitting, and high connection reliability and strong holding strength can be obtained. Further, as in this embodiment, in the case of welding, it is better to provide a groove at a position where the inner conductor is disposed.

  Next, the block (insulator) 42 will be described with reference to FIG. The block 42 is an electrically insulating plastic, and is manufactured by a known technique of injection molding. The material is appropriately selected in consideration of dimensional stability, workability, cost, etc. Generally, polybutylene terephthalate is used. (PBT), polyamide (66PA, 46PA), liquid crystal polymer (LCP), polycarbonate (PC), and synthetic materials thereof. The signal conductor 44 is attached to the block 42 by integral molding.

  The insulator 42 has a substantially rectangular parallelepiped shape, and a through hole 421 into which the contact portion 441 enters is provided at a position corresponding to the contact portion 441 of the signal conductor 44. The shape and size of the through hole 421 should be in accordance with the shape and size of the contact portion 441 of the signal conductor 44, and the contact portion 441 can be inserted and displaced, and the amount of displacement, workability, strength, etc. are taken into consideration. And design accordingly.

  The insulator 42 is provided with four protrusions 422 on the opposite side of the through hole 421. The protrusion 422 forms a space by contacting the end of the main body 461 of the ground conductor 46. The connection portion 443 of the signal conductor 44 is located in the space so that the connection portion 443 and the ground conductor 46 do not come into contact with each other. The shape and size of the protrusion 422 is appropriately designed in consideration of this role, connection stability, low connector height, strength, workability, and the like.

  Next, the ground conductor 46 will be described with reference to FIG. The ground conductor 46 is made of metal and is manufactured by a known press working. The material for the ground conductor 46 is required to be springy or moldable, and examples thereof include beryllium copper and phosphor bronze. The ground conductor 46 is an electrical conductor that is electrically and mechanically connected to the coaxial cable 80 and the external conductor 26 of the receptacle connector 220 as an external conductor.

  The ground conductor 46 mainly includes a main body 461, a connection portion 463, a lid 465, and a locking portion 464. The ground conductor 46 is stamped from a material into a predetermined shape by pressing (not shown), and then further bent by pressing (not shown), and the coaxial cable 80 is connected. The insulator 42 formed by integrally molding the signal conductor 44 is set on the ground conductor 46, and further bent (bent), and the coaxial cable 80 is crimped to the connection portion 463 of the ground conductor 46. 19A and 19B.

  Inside the main body 461 and the lid 465, the insulator 42 enters and holds. The main body 461 and the lid 465 form a shape into which the insulator 42 enters. The main body 461 and the lid 465 only need to contain the insulator 42. The main body 461 and the lid 465 are formed in accordance with the shape of the insulator 42 in consideration of holding force, miniaturization of the connector, ultra-low profile at the time of fitting, workability and the like. And design accordingly.

  A locking portion 464 that engages with the engaging portion 266 of the outer conductor 26 is provided on the outer peripheral portion of the main body 461 of the ground conductor 46 so as to be folded outward. The locking portion 464 only needs to be able to engage with the engaging portion 266, and is appropriately designed in consideration of ultra-low profile, workability, strength, and the like during fitting.

  The connection portion 463 is a portion connected to the braid (outer conductor) of the coaxial cable 80. In this embodiment, the connection portion 463 has a substantially cylindrical shape, and is connected by crimping the braided portion. The shape and size of the connection part 463 may be designed as appropriate in consideration of connection stability, connection strength, workability, and the like as long as it can be connected to the braid.

  The above description only shows an example of the embodiment of the present invention, and various modifications can be made within the scope of the claims.

Next, a plug connector according to the present invention was prototyped and evaluated, and will be described below.
The plug connector shown in the embodiment is a plug connector having the structure shown in FIG. 2 except that the ground conductor shown in FIG. 7 is used, and is a coaxial cable plug connector having a characteristic impedance of 50Ω, A signal conductor made of a Corson copper alloy material, a ground conductor made of a phosphor bronze material for a spring, and an insulator made of an LCP material, and a contact portion of the signal conductor and a tip of the inner conductor of the coaxial cable The distance d was 0.85 mm, the dimensions of the three recesses were 0.04 mm in depth, and the thickness of the ground conductor was 0.1 mm. The thickness dimension of the connector was 0.62 mm. The width of the connection portion of the signal conductor and 0.4 mm, the diameter of the inner conductor of the coaxial cable and 0.15 mm, and 2.66 times the diameter of the inner conductor of the coaxial cable.

  For reference, a plug connector of a comparative example having the same configuration as the plug connector of the example except that no concave portion is provided in the ground conductor was also prototyped, and performance evaluation was performed together with the example. The evaluation results are shown in Table 2.

(Performance evaluation)
1. Measurement of VSWR VSWR was measured with a network analyzer.

2. Measurement of connector strength (strength of the removed part when the connector is removed)
The connector strength was measured with a tensile tester.

  From the results shown in Table 2, it can be seen that the VSWR is improved and the strength of the connector is higher in the example than in the comparative example.

  Further, for reference, the ground conductor is formed by increasing the vertical distance X so that the characteristic impedance is the same as that in which the ground conductor is provided with a recess and the ground conductor is not provided with a recess. When the thickness of the connector was measured with an optical microscope, the thickness of the connector was 0.62 mm when the concave portion was provided, and 0.66 mm when the concave portion was not provided. From this result, it was also found that the thickness of the connector can be reduced (lower profile).

  According to the present invention, by optimizing the two conductor facing areas where the ground conductor and the signal conductor are opposed to each other (without changing the external dimensions of the connector, Adjusting to improve the VSWR and maintaining the characteristic impedance of the coaxial cable without increasing the amount of conductive material that makes up the conductor for grounding, especially adjusting from a low characteristic impedance value to a high impedance value Provided is a plug connector used for connecting a coaxial cable, particularly a plug connector for connecting an RF module and an antenna in an internal part of an electronic device, which can be reduced in height and can be reduced in height. It became possible.

  In addition, the present invention is used for communication devices such as smartphones and notebook PCs, electrical devices, and electronic devices, and does not lead to an increase in board manufacturing cost, and the fitting height is about 0.8 mm. Even if it is made, it is composed of a plug connector, a receptacle connector, and a plug connector and a receptacle connector that have a structure in which there is no erroneous fitting and mounting, and there is no defect such as a short circuit and a stable connection can be obtained. A coaxial connector can be provided.

DESCRIPTION OF SYMBOLS 1 Plug connector 3 Signal conductor 5 Ground conductor 7 Insulator 9 Contact part 11 Connection part 13 Both conductor opposing area 15 Distance expansion part 17 Recessed part 19 Thick partition part 20 Coaxial cable 21 Protrusion 22 Internal conductor 23 Through-hole 24 External conductor 26 External conductor 40 Plug connector 42 Block 44 Signal conductor (or socket contact)
46 Grounding conductor (or shell)
80 Coaxial cable 212 Fitting port 220 Receptacle connector 222 Insulator 221 Recessed portion 224 Center conductor 241 Contact portion 243 Connection portion 261 Main portion 263 Connection portion 264 Plate-like piece 265 Slit 266 Engagement portion 421 Through hole 422 Protrusion 441 Contact portion 442 Fixing portion 443 Connection portion 461 Main body 463 Connection portion 464 Locking portion 465 Lid

Claims (10)

A signal conductor having a contact portion made of a conductive material and electrically connected to the contact of the mating connector, and a connection portion electrically connected to the exposed inner conductor of the coaxial cable;
A grounding conductor made of a conductive material and electrically connected to the outer conductor of the coaxial cable, and made of an electrically insulating material, integrally formed with the signal conductor, and electrically insulated between the signal conductor and the grounding conductor. An insulator to
Plug connector comprising:
Seen in a cross section including the longitudinal direction of the signal conductor,
An inner surface of the ground conductor without increasing the thickness dimension of the connector in the two conductor facing areas where the ground conductor and the signal conductor are opposed to each other for adjustment to match a predetermined impedance value. If, opposite the inner surface, Ri Na form a distance larger portion vertical distance increases between the rear surface of the signal conductor,
The distance expanding portion is provided with at least one recess formed on the inner surface of the ground conductor while maintaining a flat state without forming a protrusion on the outer surface of the ground conductor, and the depth of the recess is increased. The impedance value can be increased and adjusted in proportion to
The connecting portion of the signal conductor is configured as a flat plate having a width of 1 to 5 times the diameter of the inner conductor of the coaxial cable, and the exposed inner conductor of the coaxial cable is soldered and electrically connected. plug connector which is characterized Zheng Rukoto.   The plug connector according to claim 1, wherein the exposed internal conductor of the coaxial cable is located on the opposite side of the ground conductor with the signal conductor interposed therebetween.   The plug connector according to claim 2, wherein the contact portion of the signal conductor is located at a predetermined distance in the longitudinal direction of the signal conductor with respect to the tip of the inner conductor of the coaxial cable connected to the connection portion. The distance expanding portion is formed by providing a plurality of recesses in the ground conductor, and the ground conductor is positioned between the recesses and extends in a direction extending across the longitudinal direction of the signal conductor. The plug connector according to claim 1, further comprising a portion. The plug connector according to any one of claims 1 to 4 , wherein a through hole is provided on a front end side of the ground conductor, and a protrusion capable of positioning and inserting into the through hole is provided on the insulator. A receptacle connector that detachably mates with a plug connector to which a coaxial cable is connected,
A contact portion in contact with the signal conductor of the plug connector, and a central conductor having a connection portion to be mounted on the substrate;
A main body portion that contacts the ground conductor of the plug connector, and an outer conductor having a connection portion to be mounted on the substrate;
In a receptacle connector comprising an insulator that holds the center conductor and the outer conductor,
The outer conductor on the body portion, for engagement with the ground conductor of the plug connector at its front end, provided with an engagement section of the folded shape on the outside,
A portion of the main body portion between the connection portion and the engagement portion in the outer conductor is covered with the insulator,
The insulator is provided with a recess in a portion where the connection portion of the center conductor protrudes, and the connection portion of the center conductor is in the recess and in a fitted state with the plug connector and the ground conductor. receptacle connector characterized that you position so as not to contact. By providing a plurality of slits in the outer conductor, the outer periphery of the outer conductor is formed by a plurality of plate-like pieces,
7. The receptacle connector according to claim 6 , wherein at least one engaging portion bent outward is provided at the tip of the plate-like piece to engage with the ground conductor of the plug connector. By providing eight slits in the outer conductor, the outer periphery of the outer conductor is formed by eight plate-like pieces,
8. The receptacle connector according to claim 7 , wherein an engagement part bent outward is provided at the tip of the plate-like piece every other sheet to engage with a ground conductor of the plug connector. The receptacle connector, the center conductor, the receptacle connector according to claim 6, 7 or 8, wherein the said outer conductor and the insulator are those formed by integral molding. And the plug connector according to any one of claims 1 to 5 coaxial connector composed of a receptacle connector according to any one of claims 6-9.

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