JP5121053B2 - Connector terminal with shielded wire - Google Patents

Description

  The present invention relates to a connector terminal with a shielded wire used for connection of a counterpart terminal, and in particular, suppresses the occurrence of a specific impedance mismatch with respect to the shielded wire at the time of connector connection, and improves the high-frequency characteristics of the shielded wire to be connected. The present invention relates to a connector terminal with a shielded electric wire that can be improved.

FIG. 4 shows a conventional example of a connector terminal 3 connected to one end of the coaxial cable 1 in order to connect the coaxial cable 1 which is a kind of shielded wire to a counterpart terminal (not shown).
In addition, the connector terminal 3 shown here is a thing of the structure disclosed by patent document 1. FIG.

  The coaxial cable 1 includes a central conductor (core wire) 11 that is an internal conductor, an insulator (internal coating) 13 that extends in the longitudinal direction of the central conductor 11 while surrounding the outer peripheral surface of the central conductor 11, and a shield member. An outer conductor 15 extending in the longitudinal direction while surrounding the outer peripheral surface of the insulator 13, and an insulating skin (outer covering) 17 extending in the longitudinal direction while surrounding the outer peripheral surface of the outer conductor 15 are provided. Configured. And the one end part of each of the center conductor 11, the insulator 13, the outer conductor 15, and the insulation outer shell 17 is exposed in the one end part of the longitudinal direction.

  That is, one end portion of the coaxial cable 1 attached to the connector terminal 3 is partially arranged so that the outer conductor 15 is exposed by a predetermined length L1 from the front end of the insulating sheath 17 before being attached to the connector terminal 3. The insulating conductor 13 is partially cut away from the tip of the outer conductor 15 so as to be exposed by a predetermined length L2, and the center conductor 11 is exposed from the tip of the insulator 13 by a predetermined length L3. As a result, the central conductor 11, the insulator 13, and the outer conductor 15 are exposed at one end in the longitudinal direction of the coaxial cable 1.

The connector terminal 3 is a so-called plug-type terminal connected to the end of the coaxial cable 1, and a conductive metallic terminal body 25 attached to one end of the coaxial cable 1 and one end of the coaxial cable 1. And a center conductor conducting portion (core wire conducting portion: generally called “center contact”) 21 for connecting the center conductor 11 to the counterpart terminal, and the center conductor conducting portion. An insulating member (for example, a foamed dielectric material made of polyethylene or the like) 23 in which a through hole 23 a that penetrates and is engaged with the central conductor 11 in a state where the electrical conductor 21 is connected to the central conductor 11 is formed; It is integrally formed at one end portion in the longitudinal direction (the left end side in FIG. 4A), is fitted around the insulating member 23, and surrounds the periphery of the central conductor conducting portion 21. And is formed integrally with the terminal main body 25 so as to be located on the other end side in the longitudinal direction of the terminal main body 25 with respect to the cylindrical portion 25a. And an outer conductor caulking part (shield member caulking part) 25b connected to.
The center conductor conducting portion 21 has a hole 21a at the center thereof, and the center conductor 11 inserted into the hole 21a is electrically connected by soldering or the like.

  Here, the terminal body 25 is a press-formed product of a metal plate. The outer conductor caulking portion 25 b is formed as a pair of caulking pieces that are caulked to the outer peripheral surface of the outer conductor 15. Further, the coaxial cable 1 is physically fixed to the terminal main body 25 by crimping the outer peripheral surface of the insulating sheath 17 on the end side {right end side in FIG. 4A) of the outer conductor crimping portion 25b. An outer skin caulking portion 25c is integrally formed. The outer crimping portion 25c is also formed as a pair of crimping pieces, like the outer conductor crimping portion 25b.

  The plug-type connector terminal 3 described above is combined with a jack or a receptacle as a mating terminal into which the above-described center conductor conducting portion 21 and the cylindrical portion 25a are fitted to each other, thereby realizing a connector connection of the coaxial cable 1. To do.

JP 2004-303692 A

  By the way, in the case of this kind of conventional connector terminal 3, as shown also in FIG. 4A, the inner diameter shape of the cylindrical portion 25a is not limited to the external conductor due to restrictions on the fitting structure with the counterpart terminal. It is set to be considerably larger than 15 cross-sectional outer shapes.

  For this reason, the characteristic impedance between the center conductor conducting portion 21 and the cylindrical portion 25a by the combination with the insulating member 23 is between the center conductor 11 and the outer conductor 15 in the coaxial cable 1 as shown in FIG. Even if the characteristic impedance is 50 ohms, the portion where the insulator 13 is exposed from the outer conductor 15 in FIG. 4A surrounds the central conductor 11 and its periphery as shown by a separation distance L4 in FIG. Since the separation distance from the conductive layer (shield layer) is abruptly changed, characteristic impedance mismatch is shown. This mismatch in characteristic impedance may adversely affect the high-frequency characteristics of the coaxial cable 1.

  The present invention has been made in view of the above-described problems, and its purpose is to suppress the occurrence of mismatch in characteristic impedance with respect to a shielded wire at the time of connector connection, and to achieve high-frequency characteristics resulting from this mismatch in characteristic impedance. An object of the present invention is to provide a connector terminal with a shielded wire that can connect a shielded wire to a mating terminal without causing a decrease in the above.

The above-described object of the present invention is achieved by the following configuration.
(1) A core wire that is an internal conductor, an inner coating that extends in the longitudinal direction of the core wire while surrounding the outer peripheral surface of the core wire, and a shield member that extends in the longitudinal direction while surrounding the outer peripheral surface of the inner coating An outer coating extending in the longitudinal direction while surrounding the outer peripheral surface of the shield member, and one end of each of the core wire, the inner coating, and the shield member is exposed at one end in the longitudinal direction. Shielded wire,
A conductive metal terminal body attached to the one end of the shielded wire;
A core wire conducting portion electrically connected to the core wire at the one end of the shielded electric wire, and electrically connecting the core wire to a counterpart terminal;
An insulating member in which a through hole is formed in which the core wire conducting portion is connected to the core wire and penetrates with the core wire and is locked;
A cylindrical portion that is integrally formed at one end portion in the longitudinal direction of the terminal body, is externally fitted to the insulating member, and supports the core wire conducting portion via the insulating member while surrounding the periphery of the core wire conducting portion. When,
A shield member crimping portion that is integrally formed with the terminal main body so as to be positioned on the other end side in the longitudinal direction of the terminal main body with respect to the cylindrical portion, and is electrically connected by crimping the shield member When,
A connector terminal with a shielded wire, comprising:
An inner diameter shape that is integrally formed with the terminal body so as to be disposed between the cylindrical portion and the shield member crimping portion, and that is intermediate between the inner diameter shape of the cylindrical portion and the outer diameter shape of the shield member A connector terminal with a shielded electric wire, further comprising an annular portion surrounding the periphery of the core wire in a state where the wire is formed.
(2) The connector terminal with a shielded electric wire according to (1), wherein the annular portion is constituted by a pair of shield reinforcing pieces bent in contact with each other.
(3) In the insulating member, a step portion is formed in the circumferential direction of the shielded electric wire, and thereby a large-diameter insulating portion and a small-diameter insulating portion are provided,
The large-diameter insulating portion is fitted into the cylindrical portion, while the small-diameter insulating portion is crimped by the pair of shield reinforcing pieces. .

According to the configuration of (1) above, when a shielded wire is connected to the connector terminal, the periphery of the inner sheath exposed from the shield member of the shielded wire is between the cylindrical portion of the terminal body and the shield member crimped portion. It is enclosed by the annular part provided in. And this annular part surrounds the circumference | surroundings of a core wire in the state which formed the internal diameter shape of the intermediate | middle of the internal diameter shape of a cylindrical part, and the outer diameter shape of a shield member. That is, the separation distance between the core wire of the shielded electric wire inserted into the terminal body and the annular portion is the separation distance between the core wire and the shield member in the shield electric wire, and the internal conduction portion and the conduction cylinder of the terminal main body. The inner diameter of the annular portion is selected so as to be an intermediate value between the separation distance from the portion. For this reason, when the connector terminal with a shielded wire according to the present invention is used, in the portion where the inner coating is exposed from the shield member of the shielded wire, between the core wire and the conductive layer (shield layer) surrounding the periphery thereof It is possible to suppress the separation distance from changing abruptly as compared to the region before and after the longitudinal direction, and to suppress occurrence of mismatch in characteristic impedance with respect to the shielded electric wire when the connector is connected. Therefore, it is possible to connect the shielded wire to the counterpart terminal satisfactorily without deteriorating the high frequency characteristics due to the mismatch of the characteristic impedance.
According to the configuration of (2) above, by adjusting the degree of bending of each of the pair of shield reinforcing pieces with a caulking jig or the like, the inner diameter of the annular portion is appropriately adjusted according to the wire diameter of the shielded electric wire, Since the occurrence of impedance mismatch can be suppressed, even when the diameter of the shielded electric wire to be attached is changed, it is possible to easily cope with this change.
According to the configuration of (3) above, the insulating member includes the large-diameter insulating portion and the small-diameter insulating portion, and the small-diameter insulating portion is crimped by the annular portion. For this reason, the annular portion can not only suppress the occurrence of specific impedance mismatch, but can also fix the insulating member at the same time. Further, when the shielded electric wire is inserted into the connector terminal and the pair of shield reinforcing pieces constituting the annular portion is caulked by, for example, a caulking jig, it can be curved inward along the outer peripheral surface of the small-diameter insulating portion. By appropriately selecting the cross-sectional shape of the small-diameter insulating portion, the inner diameter of the annular portion can be easily selected and formed with high accuracy.

  According to the present invention, it is possible to suppress the occurrence of mismatch in characteristic impedance with respect to the shielded electric wire when the connector is connected, and to prevent the deterioration of the high-frequency characteristics due to the mismatch in characteristic impedance, and to properly connect the shielded electric wire to the counterpart. A connector terminal with a shielded wire that can be connected to the terminal can be provided.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through the best mode for carrying out the invention described below with reference to the accompanying drawings.

Hereinafter, a preferred embodiment of a connector terminal with a shielded wire (hereinafter also simply referred to as a connector terminal) according to the present invention will be described with reference to the drawings.
In the shielded electric wire of this embodiment, the central conductor that is a core wire is covered with an insulator that is an inner coating, and this insulator is further covered with an outer conductor that is a braid (that is, a shield member), A coaxial cable having a structure in which an outer conductor is covered with an insulating sheath (that is, an outer covering) that protects the inside from an external impact or the like is employed.
Here, FIG. 1 is explanatory drawing of one Embodiment of the connector terminal which concerns on this invention, (a) is a perspective view before attaching to a coaxial cable, (b) was connected to the one end part of a coaxial cable It is a perspective view of the state, (c) is a side view of the state connected to one end of the coaxial cable, FIG. 2 is a longitudinal sectional view of the connector terminal attached to one end of the coaxial cable, FIG. 3 is a schematic diagram for explaining the characteristic impedance of one end of the coaxial cable when the connector terminal shown in FIG. 2 is used.

  The connector terminal 31 according to the present embodiment is a plug-type terminal (male connector) connected to the tip of the coaxial cable 1 in order to connect the coaxial cable 1 which is a kind of shielded electric wire to the counterpart terminal.

  The coaxial cable 1 has substantially the same structure as that shown in FIG. 4A, and a central conductor (core wire) 11 that is an internal conductor and a longitudinal direction of the central conductor 11 while surrounding an outer peripheral surface of the central conductor 11. Insulating material (inner coating) 13 extending to the outer periphery, braided outer conductor 15 extending in the longitudinal direction while surrounding the outer peripheral surface of the insulating member 13 as a shield member, and surrounding the outer peripheral surface of the outer conductor 15 And an insulating outer skin (external coating) 17 extending in the longitudinal direction. And the one end part of each of the center conductor 11, the insulator 13, the outer conductor 15, and the insulation outer shell 17 is exposed in the one end part of the longitudinal direction.

  That is, one end portion of the coaxial cable 1 attached to the connector terminal 31 is partially set so that the outer conductor 15 is exposed by a predetermined length L1 from the tip of the insulating sheath 17 in advance before being attached to the connector terminal 31. The insulating conductor 13 is partially cut away from the tip of the outer conductor 15 so as to be exposed by a predetermined length L2, and the center conductor 11 is exposed from the tip of the insulator 13 by a predetermined length L3. As a result, the central conductor 11, the insulator 13, and the outer conductor 15 are exposed at one end in the longitudinal direction of the coaxial cable 1.

As shown in FIGS. 1 and 2, the connector terminal 31 is electrically connected to the central conductor 11 at one end portion of the coaxial cable 1 and the conductive metal terminal body 45 attached to one end portion of the coaxial cable 1. A central conductor conducting portion (core conductor conducting portion: generally called “center contact”) 41 for connecting the central conductor 11 to the counterpart terminal and the central conductor conducting portion 41 are connected to the central conductor 11. In the state, the insulating member (for example, a foamed dielectric material made of polyethylene or the like) 43 formed with a through hole 43d that penetrates and is engaged with the central conductor 11 and one end portion in the longitudinal direction of the terminal body 45 {FIG. (A) is integrally formed on the left end side}, is externally fitted to the insulating member 43, and surrounds the periphery of the central conductor conductive portion 41 via the insulating material 43, while the central conductor conductive portion 41 is interposed via the insulating member 23. Terminal book A cylindrical portion 25a that is supported on the central axis of 45, and is formed integrally with the terminal main body 45 so as to be positioned on the other end side in the longitudinal direction of the terminal main body 45 with respect to the cylindrical portion 25a. And an outer conductor crimping portion (shield member crimping portion) 25b that is fastened and electrically connected.
The center conductor conducting portion 41 has a hole 41a at the center thereof, and the center conductor 11 inserted into the hole 41a is electrically connected by soldering or the like.

  The terminal body 45 is a press-formed product of a metal plate. The outer conductor crimping portion 45 b is formed as a pair of crimping pieces that are crimped to the outer peripheral surface of the outer conductor 15. Further, as shown in FIG. 2, the terminal main body 45 is crimped to the outer peripheral surface of the insulating sheath 17 on the end side {right end side in FIG. A skin caulking portion 45c that is physically fixed is integrally formed. The outer crimping portion 45c is also formed as a pair of crimping pieces.

  Further, as shown in FIG. 2, the terminal main body 45 is integrally formed with the terminal main body 45 so as to be disposed between the cylindrical portion 45a and the outer conductor caulking portion 45b, and the inner diameter of the cylindrical portion 45a. An annular portion 45d that surrounds the periphery of the center conductor 11 is provided in a state where an inner diameter shape intermediate between the shape and the outer diameter shape of the outer conductor 15 is formed.

  As shown in FIG. 1A, the annular portion 45d is composed of a pair of shield reinforcing pieces 46a and 46b that are bent inward and in contact with each other. The pair of shield reinforcing pieces 46a and 46b also function as caulking pieces that are caulked to the outer periphery of the insulating member 43 positioned between the central conductor conducting portion 41 and the cylindrical portion 45a.

  Further, the insulating member 43 is formed with a stepped portion 43c extending in the circumferential direction of the coaxial cable 1, thereby having a large-diameter insulating portion 43a and a small-diameter insulating portion 43b, and the large-diameter insulating portion. 43a is fitted into the cylindrical portion 45a, while the small-diameter insulating portion 45b is crimped by the pair of shield reinforcing pieces 46a and 46b.

  In this way, when the pair of shield reinforcing pieces 46a and 46b constituting the annular portion 45d is crimped to the small-diameter insulating portion 43b of the insulating member 43 as shown in FIG. 2, the inner diameter shape of the annular portion 45d is a cylindrical portion. By adjusting and setting the degree of crimping (degree of bending) so that it is halfway between the inner diameter shape of 45a and the outer diameter shape of the outer conductor 15, it is possible to prevent the occurrence of mismatch in characteristic impedance at the portion to be crimped doing.

  The plug-type connector terminal 31 described above realizes connector connection of the coaxial cable 1 by being combined with a jack or a receptacle as a counterpart terminal into which the above-mentioned center conductor conducting portion 41 and the tubular portion 45a are fitted to each other. doing.

  According to the connector terminal 31 according to the present invention described above, when the coaxial cable 1 is connected to the connector terminal 31, the periphery of the insulator 13 exposed from the outer conductor 15 of the coaxial cable 1 is a cylindrical portion. It is surrounded by an annular portion 45d provided between 45a and the outer conductor caulking portion 45b.

  Further, as shown in FIG. 3, the annular portion 45 d surrounds the center conductor 11 in a state where an inner diameter shape intermediate between the inner diameter shape of the cylindrical portion 45 a and the outer diameter shape of the outer conductor 15 is formed. . That is, the separation distance L5 between the center conductor 11 of the coaxial cable 1 inserted and arranged in the terminal body 45 and the annular portion 45d is the separation distance L6 between the center conductor 11 and the outer conductor 15 in the coaxial cable 1. The inner diameter of the annular portion 45d is selected so as to be an intermediate value between the distance L7 between the central conductor conducting portion 41 of the terminal body 45 and the tubular portion 45a.

  For this reason, when the connector terminal 31 of this embodiment is used, in the part where the insulator 13 is exposed from the outer conductor 15 of the coaxial cable 1, it is between the central conductor 11 and the conductive layer (shield layer) surrounding it. Can be prevented from changing abruptly as compared with the region before and after the longitudinal direction, and the occurrence of mismatch in characteristic impedance with respect to the coaxial cable 1 when the connector is connected can be suppressed. For this reason, the coaxial cable 1 can be satisfactorily connected to the counterpart terminal without deteriorating the high frequency characteristics due to the mismatch of the characteristic impedance.

  Furthermore, according to the connector terminal 31 of the present embodiment, the degree of bending of each of the pair of shield reinforcing pieces 46a and 46b is adjusted by a caulking jig or the like, so that the annular portion 45d can be formed according to the wire diameter of the coaxial cable 1. Since the inner diameter can be adjusted as appropriate to prevent the occurrence of characteristic impedance mismatch, even when the wire diameter of the coaxial cable 1 to be attached is changed, it is possible to easily cope with this change. Become.

  Further, according to the connector terminal 31 of the present embodiment, the insulating member 43 includes the large-diameter insulating portion 43a and the small-diameter insulating portion 43b, and the small-diameter insulating portion 43b is crimped by the annular portion 45d. For this reason, the annular portion 45d can not only suppress the occurrence of specific impedance mismatch, but can also fix the insulating member 43 at the same time. Further, when the coaxial cable 1 is inserted into the connector terminal 31 and the pair of shield reinforcing pieces 46a and 46b constituting the annular portion 45d is crimped by, for example, a crimping jig, along the outer peripheral surface of the small-diameter insulating portion 43b. Since it can be curved inward, the inner diameter of the annular portion 45d can be easily selected and formed with high accuracy by selecting the cross-sectional shape of the small-diameter insulating portion 43b as appropriate.

  In addition, the electric wire connected by the connector terminal according to the present invention is not limited to the coaxial cable shown in the above-described embodiment, for example, various shielded electric wires provided with an outer conductor for shielding in addition to the central conductor. Is also applicable. For example, in the above-described embodiment, a description has been given of a braid provided as a shield member interposed between the insulator and the insulation skin, but the present invention is not limited thereto, and the shield member is formed of an aluminum foil, a copper foil on the outer periphery of the braid, Further, a metal foil such as an aluminum foil or a copper foil wound around the outer periphery of the insulator may be further provided. Further, the shielded electric wire may be provided with a spiral shield wire instead of the braid.

  Further, the connector terminal according to the present invention is not limited to the plug type shown in the above-described embodiment, but can be applied to a jack or receptacle type.

  In the embodiment described above, the annular portion for suppressing the specific impedance is illustrated as a simple annular member. However, the present invention is not limited to this, and various shapes can be employed. Can achieve the purpose.

It is explanatory drawing of one Embodiment of the connector terminal which concerns on this invention, (a) is a perspective view before attaching to a coaxial cable, (b) is a perspective view of the state connected to the one end part of a coaxial cable, ( c) is a side view of a state of being connected to one end of a coaxial cable. It is a longitudinal cross-sectional view of the connector terminal of the state attached to the one end part of a coaxial cable. It is a schematic diagram for demonstrating the characteristic impedance of the one end part of a coaxial cable when using the connector terminal shown in FIG. (A) is a longitudinal cross-sectional view of the conventional connector terminal connected to the edge part of a coaxial cable, (b) is AA sectional drawing of (a). It is a schematic diagram for demonstrating the characteristic impedance of the edge part of a coaxial cable when the connector terminal shown in FIG. 4 is used.

Explanation of symbols

1 Coaxial cable (shielded wire)
11 Center conductor (core wire)
13 Insulator (inner coating)
15 Outer conductor (shield member)
17 Insulation skin (outer coating)
31 Connector terminal 41 Central conductor conduction part (core wire conduction part)
43 Insulating member 43a Large-diameter insulating part 43b Small-diameter insulating part 43c Stepped part 43d Through hole 45 Terminal body 45a Tubular part 45b External conductor caulking part (shield member caulking part)
45c Crusting part 45d Annular part 46a, 46b Shield reinforcement piece

Claims (3)

A core wire that is an internal conductor; an inner sheath that extends in the longitudinal direction of the core wire while surrounding the outer peripheral surface of the core wire; a shield member that extends in the longitudinal direction while surrounding the outer peripheral surface of the inner sheath; and the shield An outer sheath extending in the longitudinal direction while surrounding an outer peripheral surface of the member, and at one end portion in the longitudinal direction, a shielded electric wire in which one end portion of each of the core wire, the inner sheath, and the shield member is exposed When,
A conductive metal terminal body attached to the one end of the shielded wire;
A core wire conducting portion electrically connected to the core wire at the one end of the shielded electric wire, and electrically connecting the core wire to a counterpart terminal;
An insulating member in which a through hole is formed in which the core wire conducting portion is connected to the core wire and penetrates with the core wire and is locked;
A cylindrical portion that is integrally formed at one end portion in the longitudinal direction of the terminal body, is externally fitted to the insulating member, and supports the core wire conducting portion via the insulating member while surrounding the periphery of the core wire conducting portion. When,
A shield member crimping portion that is integrally formed with the terminal main body so as to be positioned on the other end side in the longitudinal direction of the terminal main body with respect to the cylindrical portion, and is electrically connected by crimping the shield member When,
A connector terminal with a shielded wire, comprising:
An inner diameter shape that is integrally formed with the terminal body so as to be disposed between the cylindrical portion and the shield member crimping portion, and that is intermediate between the inner diameter shape of the cylindrical portion and the outer diameter shape of the shield member A connector terminal with a shielded electric wire, further comprising an annular portion surrounding the periphery of the core wire in a state where the wire is formed. 2. The connector terminal with a shielded electric wire according to claim 1, wherein the annular portion is constituted by a pair of shield reinforcing pieces that are bent inward and in contact with each other. In the insulating member, a step portion is formed over the circumferential direction of the shielded electric wire, and thereby a large-diameter insulating portion and a small-diameter insulating portion are provided,
The connector with a shielded electric wire according to claim 2, wherein the large-diameter insulating portion is fitted into the cylindrical portion, and the small-diameter insulating portion is crimped by the pair of shield reinforcing pieces. Terminal.

Images