JP2019216109A - Shield terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost and to secure the strength because a resin material having a low dielectric constant and high strength has a problem of high cost in a shield terminal for impedance matching. A shield terminal (12) has a female-side inner conductor (15) and a synthetic resin female-side dielectric (22), and the female-side dielectric holds the female-side inner conductor in a positioned state and has a dielectric constant of The first member 23, which is high but low in cost and high in strength, and the second member 34, which is low in strength but lower in dielectric constant than the first member 34, are combined together. Therefore, since the strength is handled by the first member and the impedance matching is handled by the second member, cost reduction and strength securing can be realized. [Selection diagram] Figure 1

Description

  The present disclosure relates to a shield terminal.

  Patent Document 1 discloses a female shield terminal in which a pair of female inner conductors connected to a twisted pair wire are accommodated in a female dielectric, and a male shield terminal in which a pair of male inner conductors are attached to a male dielectric. Is disclosed. In this type of shield terminal, as a means for insulating a pair of inner conductors, a partition formed on a dielectric is interposed between the pair of inner conductors.

JP 2012-129103 A

  When the female shield terminal and the male shield terminal are connected, the tabs of the male inner conductor are inserted into the box-shaped connecting portions of the female inner conductor, so that the male and female inner conductors are connected. The portion where the tab is inserted in the box-shaped connection portion has a lower impedance than other portions (connection portions of each inner conductor to the electric wire, etc.) because the metal overlaps. As a means for matching the impedance of the connection part between the box-shaped connection part and the tab with the impedance of the other part, it is conceivable to lower the dielectric constant of the partition part interposed between the pair of box-shaped connection parts. However, since a resin material having a low dielectric constant and ensuring strength is generally expensive, molding the entire female inner conductor with a resin material having a low dielectric constant and high mechanical strength increases the material cost.

  The present invention has been completed based on the above circumstances, and has an object to reduce costs and secure strength.

The shield terminal of the present disclosure,
Having a female-side inner conductor and a female-side dielectric made of synthetic resin,
The female-side dielectric is formed by combining a first member that holds the female-side inner conductor in a positioned state and a second member made of a material having a lower dielectric constant than the first member.

  According to the present disclosure, cost can be reduced and strength can be ensured.

FIG. 1 is a cross-sectional view illustrating a state where the shield terminal according to the first embodiment is attached to a housing. FIG. 2 is a sectional view of the shield terminal. FIG. 3 is a sectional view taken along line XX of FIG. FIG. 4 is a perspective view showing a vertically inverted state of the terminal unit. FIG. 5 is a bottom view showing a state where the female-side inner conductor is attached to the first component. FIG. 6 is a perspective view showing the upside-down state of the first component. FIG. 7 is a perspective view of the first component. FIG. 8 is a perspective view of the second component. FIG. 9 is a perspective view illustrating the upside down state of the second component. FIG. 10 is a plan view of the second component. FIG. 11 is a front view of the second component. FIG. 12 is a perspective view of the upper shell. FIG. 13 is a perspective view showing an upside down state of the upper shell.

[Description of Embodiment of Present Disclosure]
First, embodiments of the present disclosure will be listed and described.
The shield terminal of the present disclosure,
(1) It has a female-side inner conductor and a female-side dielectric made of synthetic resin, and the female-side dielectric comprises a first member that holds the female-side inner conductor in a positioned state, and a first member And a second member made of a material having a low dielectric constant. Generally, a resin material having a high dielectric constant has relatively high mechanical strength. According to the configuration of the present disclosure, the dielectric constant of the first member that requires mechanical strength is higher than that of the second member, so that the female-side inner conductor can be reliably held. A resin material having a low dielectric constant and a low mechanical strength is relatively inexpensive. Since the second member is made of a material having a lower dielectric constant than the first member, the material cost can be reduced. Therefore, according to the present invention, it is possible to reduce costs and secure strength.

  (2) It is preferable that the female-side dielectric has a front wall portion in which an insertion port into which the tab of the male-side inner conductor is inserted is formed, and the front wall portion is formed in the first member. . According to this configuration, the dielectric constant of the first member on which the front wall portion is formed is higher than that of the second member. Since the resin material having a high dielectric constant has relatively high mechanical strength, even if the tab displaced from the insertion port collides with the front wall, there is no possibility that the tab pierces the front wall.

  (3) The female-side inner conductor has a box-shaped connection portion into which a tab of the male-side inner conductor is inserted, and the female-side dielectric has a conductor accommodating chamber that accommodates the female-side inner conductor; It is preferable that an air chamber is formed in a portion of the female dielectric that forms the conductor accommodating chamber. The dielectric constant of air is lower than that of synthetic resin, which is the material of the female dielectric. By forming the air chamber, the impedance at the connection portion between the box-shaped connection portion and the tab can be increased.

  (4) It is preferable that the air chamber is formed only in a portion corresponding to the box-shaped connection portion in a length direction of the female-side inner conductor. The dielectric constant of air is lower than that of synthetic resin, which is the material of the female dielectric. By forming the air chamber, the impedance at the connection portion between the box-shaped connection portion and the tab can be increased.

  (5) The female-side inner conductor has a box-shaped connection portion into which the tab of the male-side inner conductor is inserted, and a pair of the female-side inner conductors is accommodated in the female-side dielectric in a parallel arrangement. Preferably, the second member is formed with a partition wall portion that is arranged to partition between the pair of box-shaped connection portions. According to this configuration, the partition portion is arranged so as to partition between the pair of box-shaped connection portions, thereby increasing the impedance at the connection portion between the box-shaped connection portion and the tab. Thereby, impedance matching can be achieved over the entire length of the female-side inner conductor.

[Details of Embodiment of the Present Disclosure]
[Example 1]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included.

  In the following description, the left and right directions in FIGS. 1, 2, 4 to 10, 12, and 13 are defined as the front and rear directions. Regarding the vertical direction, the directions appearing in FIGS. 1 to 3, 7, 8, 11, and 12 are defined as upper and lower as they are.

  The shield connector 10 according to the first embodiment is a connection member that forms a wire harness for an Ethernet (registered trademark) high-speed communication circuit of a vehicle, and includes a housing 11 made of a synthetic resin and a shield terminal 12 housed in the housing 11. It is comprised including. The shield terminal 12 is configured by assembling a terminal unit 13 and an outer conductor 14. One terminal unit 13 is configured by housing a pair of female-side inner conductors 15 in a female-side dielectric 22.

<Female side inner conductor 15>
The female-side inner conductor 15 has a generally elongated shape in the front-rear direction. At the front end of the female-side inner conductor 15, a rectangular tube-shaped box-shaped connection portion 16 is formed. An elongated tab 48T at the tip of the male inner conductor 48 is inserted into the box-shaped connecting portion 16 from the front of the female inner conductor 15. The tab 48T inserted into the box-shaped connecting part 16 elastically contacts the elastic contact piece 17 formed in the box-shaped connecting part 16, so that the male inner conductor 48 and the female inner conductor 15 can be conducted. Connected to.

  A step 18 is formed at the rear end of the box-shaped connection 16. An open barrel-shaped crimping portion 19 is formed at the rear end of the female-side inner conductor 15, and the front end of the electric wire 20 is fixed to the crimping portion 19 in a conductive manner. A pair of electric wires 20 connected to the pair of female-side inner conductors 15 constitute a twisted pair wire 21.

<Female side dielectric 22>
The female dielectric 22 is formed by vertically combining a half-shaped first member 23 made of synthetic resin and a second half 34 made of synthetic resin. The direction in which the first member 23 and the second member 34 are combined is a direction orthogonal to the length direction (the axis of the front end of the electric wire 20), which is elongated in the front-rear direction, and This is a direction orthogonal to the horizontal direction in which the conductors 15 are arranged. The material and the material of the first member 23 are polybutylene terephthalate (PBT) having higher dielectric constant and mechanical strength than the second member 34. The material and material of the second member 34 are polypropylene (PP) having a lower dielectric constant and lower mechanical strength than the first member 23.

<First member 23>
The first member 23 is a single component made of a synthetic resin. The first member 23 has an upper wall 24 that is elongated in the front-rear direction, and a front wall 25 that extends downward from a front edge of the upper wall 24. A pair of left and right insertion openings 26 for inserting the tab 48T is formed in the front wall 25 in a penetrating manner.

  The first member 23 includes a central partition wall 27 extending downward from a left-right central position in a front-rear central portion of the upper wall portion 24, and a left-right central partition wall 27 of the front-rear central portion of the upper wall portion 24. A pair of left and right retaining portions 28 are formed so as to extend downward from regions connected to both side surfaces. Further, a pair of left and right lock projections 29 are formed on the outer surfaces of the pair of left and right retaining portions 28.

  The first member 23 has a pair of left and right front side walls 30 extending downward from the front ends of the left and right side edges of the upper wall portion 24, and extends downward from the left-right center position of the front end portion of the upper wall portion 24. A front partition portion 31 is formed. The pair of front side walls 30 and the front partition part 31 are connected to the rear surface of the front wall part 25. The first member 23 includes a pair of left and right rear side walls 32 extending downward from the left and right side edge rear ends of the upper wall 24, and extends downward from the left and right center position at the rear end of the upper wall 24. A rear partition wall 33 is formed.

  On the outer surface (upper surface) of the upper wall portion 24, a projection-shaped first locking portion 49A is formed. A protruding second locking portion 49B is formed on the outer surface of the front side wall 30. A projecting third locking portion 49C is formed on the outer surface of the rear side wall 32. These locking portions 49A, 49B, 49C are configured to be locked to an upper shell 55 of the outer conductor 14, which will be described later.

  A front guide groove 50 </ b> F extending in the up-down direction (a direction parallel to the direction in which the first member 23 and the second member 34 are combined) is formed on the rear end surface of the front partition 31. A rear guide groove 50R extending in the vertical direction (parallel to the front guide groove 50F) is formed on the front end surface of the central partition wall 27.

  A receiving groove 51 extending in the front-rear direction is formed in a region between the front guide groove 50F and the rear guide groove 50R at the center of the lower surface of the upper wall portion 24 in the left-right direction. The front end of the receiving groove 51 is connected at right angles to the lower end of the front guide groove 50F, and the rear end of the receiving groove 51 is connected at right angles to the lower end of the rear guide groove 50R.

<Second member 34>
The second member 34 is a single component made of a synthetic resin. The second member 34 includes a substrate portion 35 elongated in the front-rear direction, and a pair of left and right side wall portions 36 extending upward from left and right side edges of the substrate portion 35. A lock portion 38 (see FIG. 7) having a stepped shape is formed on the inner side surfaces of the pair of side wall portions 36.

  The second member 34 includes a front partition 37F and a rear partition 37R that extend upward at right angles from a central position in the left-right direction of the substrate 35. A space is provided between the front partition 37F and the rear partition 37R to avoid interference with the central partition 27 of the first member 23 when the first member 23 and the second member 34 are combined. Have been. The front partition 37F and the rear partition 37R exhibit a short circuit prevention function by being interposed between the pair of female inner conductors 15 in a partition shape.

  In a plan view, the front partition 37F extends rearward from a position slightly behind the front end of the substrate 35. In a front view, the front partition 37F has a tapered shape such that the width dimension in the left-right direction gradually decreases upward (in the direction in which the first partition 23 is combined). On the front end face of the front partition 37F, a front guide edge 52F extending in the vertical direction (a direction parallel to the direction in which the first member 23 and the second member 34 are united) is formed. A rear guide edge 52R extending in the vertical direction is formed on the rear end face of the front partition wall 37F.

  The upper edge (extended end) of the front partition 37F is a fitting edge 53 extending in the front-rear direction. The fitting edge 53 is fitted into the receiving groove 51 of the first member 23 when the second member 34 is combined with the first member 23. Further, a pair of left and right ribs 54 is formed on both left and right outer surfaces of the front partition 37F (the surface facing the outer surface of the box-shaped connecting portion 16 when the first member 23 and the second member 34 are combined). Have been. The rib 54 is disposed at the rear end of the front partition 37F (a position slightly forward of the rear guide edge 52R). In a plan view, the rib 54 projects so as to approach the rear end of the box-shaped connection portion 16 from the left and right directions.

<Assembling of the first member 23 and the second member 34>
When assembling the first member 23 and the second member 34, the pair of female-side inner conductors 15 are placed on the upper wall portion 24 of the first member 23 which is turned upside down. The pair of female-side inner conductors 15 are arranged adjacent to each other with the receiving groove 51 interposed therebetween. The first member 23 and the second member 34 are divided in a vertical direction perpendicular to the longitudinal direction of the female-side inner conductor 15 and the axis of the front end of the electric wire 20, and are combined in the vertical direction.

  Accordingly, the female inner conductor 15 can be placed while being displaced downward (in a direction orthogonal to the length direction of the female inner conductor 15) with respect to the first member 23. Thereby, at the front ends of the two electric wires 20 constituting the twisted pair wire 21, the length of untwisting of the electric wire 20 can be suppressed as short as possible, so that the noise reduction function caused by untwisting of the electric wire 20 is achieved. Can be avoided.

  When the pair of female-side inner conductors 15 is placed on the first member 23, the front end of the box-shaped connecting portion 16 abuts or approaches the rear surface of the front wall portion 25 to face the box-shaped connecting portion 16. The stepped portion 18 is locked from the front with respect to the retaining portion 28, so that the female inner conductor 15 is positioned with respect to the first member 23 in a state where relative displacement in the front-rear direction is regulated. In addition, the female-side inner conductor 15 is prevented from being displaced and inclined in the left-right direction by the front end of the box-shaped connecting portion 16 being sandwiched between the front side wall 30 and the front partitioning portion 31. . Further, the female-side inner conductor 15 is prevented from being displaced and inclined in the left-right direction by sandwiching the rear end of the crimping portion 19 between the rear side wall 32 and the rear partition wall 33.

  After attaching the pair of female inner conductors 15 to the first member 23, the second member 34 turned upside down with respect to the first member 23 is assembled so as to be united from above. In the process of combining the first member 23 and the second member 34, the front guide edge 52F and the rear guide edge 52R of the second member 34 are respectively connected to the front guide groove 50F and the rear guide groove 50F of the first member 23. 50R fits into sliding contact. Thus, it is possible to prevent the front partition 37F from being displaced to the left and right and interfering with the box-shaped connecting portion 16.

  When the first member 23 and the second member 34 are united, the female dielectric 22 is formed, and at the same time, the pair of female inner conductors 15 are accommodated in the female dielectric 22. In the combined state, the front and rear guide edges 52F and 52R are kept fitted in the front and rear guide grooves 50F and 50R, and the fitting edge 53 is fitted in the receiving groove 51 of the first member 23. In addition, unauthorized deformation of the front partition 37F in the left-right direction is prevented. The combined first member 23 and second member 34 are held in a combined state by the locking of the lock portion 38 and the lock projection 29. Thus, the assembly of the terminal unit 13 is completed.

  In a state where the first member 23 and the second member 34 are united, the front side wall 30, the side wall portion 36, and the rear side wall 32 are arranged so as to be arranged in series in a front and rear direction, and the front partition portion 31 and the front partition wall portion 37F are arranged. , The central partition wall 27, the rear partition wall 37R, and the rear partition wall 33 are arranged so as to be arranged in a series in the front-rear direction. Thus, a pair of left and right conductor accommodating chambers 39 is formed inside the female dielectric 22. A pair of female inner conductors 15 are individually accommodated in the pair of conductor accommodation chambers 39 in a state where they are arranged side by side.

<Outer conductor 14>
The terminal unit 13 is surrounded by a rectangular cylindrical outer conductor 14 made of a metal material. The outer conductor 14 includes an upper shell 55 and a lower shell 56. In the upper shell 55, a first locking recess 57A, a second locking recess 57B, a third locking recess 57C, and the barrel portion 40 are formed. When assembling the outer conductor 14 to the terminal unit 13, the upper shell 55 and the lower shell 56 are fitted and united so as to sandwich the terminal unit 13 from above and below.

  When the outer conductor 14 is attached to the terminal unit 13, the shield terminal 12 is configured. In a state where the outer conductor 14 is assembled to the terminal unit 13, the first locking recess 57 </ b> A, the second locking recess 57 </ b> B, and the third locking recess 57 </ b> C of the upper shell 55 are respectively connected to the first locking portion of the first member 23. The upper shell 55 is held in an assembled state with respect to the terminal unit 13 (the first member 23) by separately locking to the 49A, the second locking portion 49B, and the third locking portion 49C. The barrel portion 40 is fixed to the braided wire 41 of the twisted pair wire 21. The shield terminal 12 fixed to the twisted pair wire 21 is inserted into the housing 11 from behind and assembled.

  The shield terminal 12 and the terminal unit 13 according to the first embodiment are used for a high-speed communication circuit. The female inner conductor 15 and the male inner conductor 48 are connected by inserting a tab 48T into the box-shaped connection portion 16. The portion where the tab 48T is inserted in the box-shaped connection portion 16 has a lower impedance than the other portion (the crimp portion 19 of the female-side inner conductor 15 connected to the electric wire 20) because the metal overlaps. . In order to improve the reliability of the communication performance, it is necessary to match the impedance of the connection portion between the box-shaped connection portion 16 and the tab 48T with the impedance of other portions.

  In the first embodiment, the dielectric constant of the front partition 37F interposed between the pair of box-shaped connecting portions 16 is reduced as the impedance matching means. However, since a resin material having a low dielectric constant and high mechanical strength is generally expensive, molding the entire female-side inner conductor 15 with a resin material having a low dielectric constant and high mechanical strength reduces the material cost. Get higher. Thus, in the first embodiment, the female dielectric 22 is divided into two members, a first member 23 and a second member 34, and the material of the second member 34 on which the front partition wall portion 37F is formed has a dielectric constant of The first member 23 is made of polypropylene having a low mechanical strength, and polybutylene terephthalate, which is a relatively inexpensive material having a higher dielectric constant than the second member 34, is used. As a result, material costs are reduced.

  Further, since the front partition 37F has a tapered shape (wedge shape) that gradually becomes narrower upward, there is a gap between the outer surface of the front partition 37F and the outer surface of the box-shaped connection portion 16. An air layer 58 is formed. Since the air has a very low dielectric constant, the air layer 58 is arranged so as to correspond to the box-shaped connection portion 16, so that the impedance at the connection portion between the box-shaped connection portion 16 and the tab 48T is increased. I have.

  If there is an air layer 58 between the front partition 37F and the box-shaped connecting portion 16, there is a concern that the female inner conductor 15 is displaced so as to be inclined toward the front partition 37F. However, since the rib 54 protruding toward the box-shaped connecting portion 16 is formed in the front partition 37F, there is no possibility that the female inner conductor 15 is inclined toward the front partition 37F.

  Further, since the upper wall portion 24 of the first member 23 having a high dielectric constant is close to and opposes the upper surface of the box-shaped connection portion 16, there is a concern that the impedance may be reduced. As a countermeasure, a pair of left and right front first air chambers 42 is formed at the front end of the upper wall portion 24, and a pair of left and right rear first air chambers are provided at positions near the rear of the pair of front first air chambers 42 on the upper wall portion 24. A first side air chamber 43 is formed.

  Each of the first air chambers 42 and 43 is located in a region corresponding to the box-shaped connection portion 16 in the front-rear direction (the length direction of the female-side inner conductor 15). A region of the upper wall portion 24 between the front first air chamber 42 and the rear first air chamber 43 has a function as a reinforcing portion 44.

  A pair of left and right front second air chambers 45 is formed at the front end of the substrate portion 35 of the second member 34, and a pair of left and right front air chambers 45 is provided at positions near the rear of the pair of front second air chambers 45 in the substrate portion 35. The rear second air chamber 46 is formed. Each of the second air chambers 45 and 46 is located in a region corresponding to the box-shaped connection portion 16 in the length direction of the female-side inner conductor 15. A region between the front second air chamber 45 and the rear second air chamber 46 in the substrate portion 35 has a function as a reinforcing portion 47.

  The shield terminal 12 according to the first embodiment includes a pair of female-side inner conductors 15 and a female-side dielectric 22. Each female inner conductor 15 has a box-shaped connection portion 16 into which the tab 48T of the male inner conductor 48 is inserted. The female dielectric member 22 is configured by combining a first member 23 and a second member 34 made of a material or a material having a lower dielectric constant than the first member 23. A pair of female-side inner conductors 15 are accommodated in the female-side dielectric 22 so as to be arranged side by side on the left and right.

  After dividing the female dielectric 22 into a first member 23 and a second member 34 having different dielectric constants, a front partition 37F was formed on the second member 34 having a lower dielectric constant. The front partition 37F is arranged so as to partition between the pair of box-shaped connecting portions 16, thereby increasing the impedance at the connecting portion between the box-shaped connecting portion 16 and the tab 48T, and increasing the total length of the female-side inner conductor 15. The impedance is matched over the range. According to this configuration, the material cost can be reduced as compared with the case where the second member 34 is made of a resin material or a material having a low dielectric constant and a high mechanical strength. In general, a resin material having a high dielectric constant has a relatively high mechanical strength. Therefore, by using the first member 23 having a higher dielectric constant than the second member 34, the strength of the entire female-side dielectric 22 is ensured. ing. Since the portion requiring mechanical strength to hold the female inner conductor 15 is formed in the first member 23, the female inner conductor 15 can be held reliably.

  The front partition 37F has a cantilevered shape extending from the substrate 35 forming the second member 34. The first member 23 has an extended end portion (fitting edge) of the front partition 37F. The receiving groove 51 for fitting the portion 53) is formed. Since a material having a low dielectric constant generally has low mechanical strength, there is a concern that the front partition 37F may be deformed by interference with the female-side inner conductor 15.

  However, since the extended end portion (fitting edge 53) of the front partition 37F is fitted in the receiving groove 51 of the first member 23 having relatively high mechanical strength, the left-right direction of the front partition 37F is set. Unauthorized deformation can be prevented. Further, the creepage distance between the female-side inner conductors 15 is increased by the area where the outer surface of the front partition 37F and the inner surface of the receiving groove 51 face each other, so that the insulation performance is also excellent.

  The front partition 37F extends from the substrate 35 forming the second member 34 in the direction in which the first member 23 is combined with the first member 23. Thus, a front guide groove 50F and a rear guide groove 50R for slidingly contacting the front partition wall 37F are formed. According to this configuration, in the process of combining the first member 23 and the second member 34, the front and rear guide edges 52F, 52R of the front partition wall 37F are slidably contacted with the front and rear guide grooves 50F, 50R. Unauthorized deformation of the partition wall 37F can be prevented.

  The front partition 37F extends in a cantilever manner from the substrate 35 forming the second member 34 in the direction of uniting with the first member 23, and the thickness gradually decreases in the extending direction. is there. According to this configuration, it is possible to prevent the front partition 37F from interfering with the box-shaped connecting portion 16 in the process of combining the first member 23 and the second member 34. In addition, since the air layer 58 having a low dielectric constant is formed between the front partition 37F and the box-shaped connection part 16, the impedance of the box-shaped connection part 16 is increased.

  In addition, when the air layer 58 exists between the front partition 37F and the box-shaped connecting portion 16, there is a concern that the female inner conductor 15 may be incorrectly inclined toward the front partition 37F. Therefore, a rib 54 is formed on the front partition 37F so as to protrude from the surface of the front partition 37F facing the box-shaped connection portion 16 toward the female inner conductor 15. Accordingly, even if the female inner conductor 15 is inclined toward the front partition 37F, the inclination of the female inner conductor 15 can be suppressed by contact with the rib 54. Further, the strength of the front partition 37F is increased by the ribs 54.

  The insertion hole 26 into which the tab 48T of the male inner conductor 48 is inserted is formed in the front wall portion 25 of the female dielectric 22. However, when the tab 48T is displaced vertically and horizontally, the tab 48T is moved. It is feared that it will stick into the front surface of the front wall 25. Therefore, focusing on the fact that the first member 23 made of a material having a higher dielectric constant than the second member 34 also has higher mechanical strength than the second member 34, the first wall 23 is made of the first member 23. 23. Thereby, the mechanical strength of the front wall 25 is increased, so that even if the tab 48T displaced from the insertion opening 26 abuts against the front wall 25, there is no possibility that the tab 48T will pierce the front wall 25.

  The first member 23 is formed with locking portions 49A, 49B, and 49C that lock the female conductor 22 and the outer conductor 14 in an assembled state by locking with the outer conductor 14 (upper shell 55). ing. Since the first member 23 on which the locking portions 49A, 49B, 49C are formed has high mechanical strength, the locking portions 49A, 49B, 49C are locked to the outer conductor 14 (upper shell 55) made of a metal material. However, there is no danger of unauthorized deformation. As a result, the female dielectric 22 and the outer conductor 14 can be reliably held in the assembled state.

  As means for increasing the impedance of the connection portion between the box-shaped connection portion 16 and the tab 48T, air chambers 42, 43, and 43 are provided on the upper wall portion 24 and the substrate portion 35 that constitute the conductor accommodating chamber 39 of the female dielectric 22. 45 and 46 were formed. Since the dielectric constant of air is lower than that of the synthetic resin that is the material of the female dielectric 22, the formation of the air chambers 42, 43, 45, and 46 realizes an increase in impedance.

  Further, the front first air chamber 42 and the rear first air chamber 43 of the upper wall portion 24 are located in a region of the upper wall portion 24 that is located forward of the retaining portion 28 (that is, corresponds to the box-shaped connection portion 16 in the front-rear direction). Area). Thereby, after forming the retaining portion 28 serving as retaining means for the female inner conductor 15 on the upper wall portion 24, the air chambers 42 and 43 are arranged in the region corresponding to the box-shaped connecting portion 16. It was realized.

[Other embodiments]
The invention is not limited to the embodiments described above and illustrated by the drawings, but is indicated by the claims. The present invention includes the meaning equivalent to the claims and all modifications within the claims, and is intended to include the following embodiments.
(1) In the first embodiment, the partition part is separated into the front partition part and the rear partition part. However, the partition part may have a single wall shape.
(2) In the first embodiment, the receiving groove is formed in the first member. However, the first member may have no receiving groove.
(3) In the first embodiment, the guide groove is formed in the first member. However, the first member may be configured to have no guide groove.
(4) In the first embodiment, the front partition has a thickness gradually reduced in the extending direction. However, the front partition has a constant thickness in all regions in the extending direction. Is also good.
(5) In the first embodiment, the rib is formed on the front partition, but the front partition may have no rib.
(6) In the first embodiment, the front wall is provided on the first member (a member made of a material having a higher dielectric constant than the second member), but the front wall may be formed on the second member.
(7) In the above embodiment, the air chamber is formed in the first member and the second member. However, the first member and the second member may not have the air chamber.
(8) In the first embodiment, the two electric wires connected to the pair of female inner conductors constitute a twisted pair wire. However, in the present invention, the electric wires connected to the female inner conductor constitute a twisted pair wire. Applicable even when not.
(9) In the first embodiment, two female inner conductors are accommodated in one female dielectric, but three or more female inner conductors may be accommodated in one female dielectric.
(10) In the first embodiment, the female dielectric is composed of two parts, the first member and the second member. However, the female dielectric has three or more members including the first member and the second member. It may be a combination of members.
(11) In the first embodiment, the material and material of the first component are polybutylene terephthalate (PBT). However, the material and material of the first component may be other than polybutylene terephthalate.
(12) In the first embodiment, the material and material of the second part are polypropylene (PP), but the material and material of the second part are polyethylene (PE), polystyrene (PS), foamed polybutylene terephthalate, and the like. There may be.
(13) In the first embodiment, the combination of the material or material of the first component and the second component is polybutylene terephthalate and polypropylene, but the combination of the material or material of the first component and the second component is polybutylene. Terephthalate and polyethylene (PE) may be used, and polybutylene terephthalate and foamed polybutylene terephthalate may be used.

DESCRIPTION OF SYMBOLS 10 ... Shield connector 11 ... Housing 12 ... Shield terminal 13 ... Terminal unit 14 ... Outer conductor 15 ... Female inner conductor 16 ... Box-shaped connection part 17 ... Elastic contact piece 18 ... Stepped part 19 ... Crimping part 20 ... Electric wire 21 ... Twisted pair Wire 22 ... female side dielectric 23 ... first member 24 ... upper wall 25 ... front wall 26 ... insertion opening 27 ... central partition wall 28 ... retaining part 29 ... lock projection 30 ... front side wall 31 ... front partition Part 32: rear side wall 33 ... rear partition wall 34 ... second member 35 ... substrate part 36 ... side wall part 37F ... front partition part (partition part)
37R ... rear side partition part 38 ... lock part 39 ... conductor accommodating chamber 40 ... barrel part 41 ... braided wire 42 ... front first air chamber 43 ... rear first air chamber 44 ... reinforcing part 45 ... front second air chamber 46 ... Rear second air chamber 47 ... Reinforcing part 48 ... Male inner conductor 48T ... Tab 49A ... First locking part 49B ... Second locking part 49C ... Third locking part 50F ... Front guide groove 50R ... Rear side Guide groove 51 receiving groove 52F front guide edge 52R rear guide edge 53 fitting edge 54 rib 55 upper shell 56 lower shell 57A first locking recess 57B second locking recess 57C. Third locking recess 58: air layer

Claims (5)

Having a female-side inner conductor and a female-side dielectric made of synthetic resin,
A shield terminal, wherein the female-side dielectric is formed by combining a first member that holds the female-side inner conductor in a positioning state and a second member made of a material having a lower dielectric constant than the first member. The female-side dielectric has a front wall portion in which an insertion port into which a tab of the male-side inner conductor is inserted is formed,
The shield terminal according to claim 1, wherein the front wall portion is formed on the first member. The female inner conductor has a box-shaped connection portion into which a tab of the male inner conductor is inserted,
The female dielectric has a conductor accommodating chamber for accommodating the female inner conductor,
3. The shield terminal according to claim 1, wherein an air chamber is formed in a portion of the female dielectric that forms the conductor accommodating chamber. 4.   The shield terminal according to claim 3, wherein the air chamber is formed only in a portion corresponding to the box-shaped connection portion in a length direction of the female-side inner conductor. The female inner conductor has a box-shaped connection portion into which a tab of the male inner conductor is inserted,
In the female-side dielectric, a pair of the female-side inner conductors are housed in parallel,
The shield terminal according to any one of claims 1 to 4, wherein the second member is formed with a partition wall portion arranged to partition between the pair of box-shaped connection portions.

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