JP5561970B2 - Connector for coaxial cable - Google Patents

Description

  The present invention relates to a coaxial cable connector used for connection of wiring of an electronic device installed in an automobile or the like.

  A high-frequency shielded electric wire is used to transmit a high-frequency electrical signal. In addition, with the increasing frequency of transmitted electrical signals, connectors with shielded wires (coaxial connectors) that connect shielded wires to each other so as to relay the electrical signals transmitted through this shielded wire are also required to support high frequencies. Is growing.

  As this shielded wire structure, for example, there is a so-called coaxial cable. This coaxial cable has a central conductor (core wire) bundled with a plurality of metal strands as a transmission path for electrical signals and the like, and a shield conductor (external conductor) consisting of a braided wire formed by braiding a plurality of strands. An insulator (inner coating) is interposed. Further, the outer periphery of the shield conductor is covered with an insulating sheath (external coating), and the shield conductor covers the outer periphery of the insulator to shield the central conductor electromagnetically.

  On the other hand, in the coaxial connector that relays and connects a high-frequency signal through a coaxial cable, if there is a deviation in impedance between the connected coaxial cable and the mating coaxial connector and the coaxial connector, the transmitted electrical Affects the signal. In particular, the influence is large in a high-frequency electric signal of several GHz. For this reason, in the coaxial connector, impedance matching between the connected coaxial cable and the mating coaxial connector to be fitted is achieved.

  By the way, the outer diameter of the crimping portion connected to the central conductor of the coaxial cable may be different from the outer diameter of the connecting portion connected to the central conductor conducting terminal of the counterpart coaxial connector. In the coaxial connector, there may be a region where the ratio between the outer diameter of the central conductor conducting terminal and the inner diameter of the shield terminal is different.

  In such a case, for example, the inner diameter of the shield terminal is adjusted in accordance with the change in the outer diameter of the center conductor conducting terminal, and the ratio of the outer diameter of the center conductor conducting terminal to the inner diameter of the shield terminal is made constant. It is conceivable to match the impedance in the coaxial connector.

  However, when the miniaturization of the coaxial connector is required, the size and shape of the central conductor conducting terminal and the shield terminal may be limited. In the conventional coaxial connector, the coaxial connector generated in such a case It may not be possible to cope with the impedance deviation.

  On the other hand, an inner conductor terminal (center conductor conduction terminal) connected to the signal conductor (center conductor) of the coaxial cable, an outer conductor terminal (shield terminal) connected to the shield conductor of the coaxial cable, and an inner conductor terminal A plurality of coaxial connectors having different inner and outer diameter ratios defined by a ratio of an outer diameter of the inner conductor terminal and an inner diameter of the outer conductor terminal. The dielectric is formed of materials having different dielectric constants between portions in a plurality of regions having different inner / outer diameter ratios so that the impedance of the entire coaxial connector matches. A coaxial connector is disclosed (for example, see Patent Document 1).

  According to this coaxial cable, when there are multiple regions where the ratio between the outer diameter of the inner conductor terminal and the inner diameter of the outer conductor terminal is different, a part of the dielectric is formed of a material having a different dielectric constant from the other parts. By doing so, it is said that the impedance in each region can be adjusted to match the impedance in the entire coaxial connector.

JP 2008-146882 A

The conventional coaxial cable connector described above has the following problems to be solved.
That is, the outer conductor terminal is obtained by press-molding a conductive metal plate into a predetermined shape and size, and there are parts where the cross-sectional area becomes larger or smaller due to the reason for assembly and molding of the coaxial connector. There is. If there is a difference in the ratio between the outer diameter of the inner conductor terminal and the inner diameter of the outer conductor terminal at the part where the cross-sectional area is different, use the dielectric materials with different dielectric constants as described above to match the impedance of the entire coaxial connector. Even if it can be taken, the current path becomes narrow in the portion where the cross-sectional area of the outer conductor terminal (shield terminal) becomes small, and as a result, there is a disadvantage that the shielding performance in this portion is lowered.

  Further, in order to improve the shielding performance, there may be a method in which a specially shaped lid member made of a conductive material is connected to a portion having a small cross-sectional area such as an open portion of the outer conductor terminal. The construction of the system is complicated, and there is a disadvantage that the material cost and the assembly cost are high.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a coaxial cable connector capable of obtaining sufficient shielding performance when impedance matching is performed for the entire coaxial connector. .

In order to achieve the above-described object, the coaxial cable connector according to the present invention is characterized by the following (1) to (2).
(1) A center conductor conducting terminal connected to the center conductor of the shielded wire, a shield terminal connected to the shield conductor of the shielded wire, and an insulating member interposed between the center conductor conducting terminal and the shield terminal A coaxial cable connector comprising:
The shield terminal includes a bottom plate portion, a first crimp barrel portion erected from an end in the width direction of the bottom plate portion, and holding the insulation member by crimping the insulation member, and the shield conductor. A second crimping barrel portion that is connected to the shield conductor by caulking and is erected from an end portion in the width direction of the bottom plate portion, an end portion of the first crimping barrel portion, and the second crimping portion A linking piece that bridges the end of the barrel portion,
When the first crimping barrel portion and the second crimping barrel portion are crimped, the connecting piece is continuously provided on a substantially vertical connection portion between the center conductor and the center conductor conduction terminal, Covering the central conductor conduction terminal and the central conductor of the shielded wire exposed between the first crimp barrel part and the second crimp barrel part,
about.
(2) A coaxial cable connector configured as described in (1) above,
The shield terminal is formed with an open portion surrounded by the bottom plate portion, the first crimp barrel portion, the second crimp barrel portion, and the connecting piece.
about.

According to the coaxial cable connector configured as described in (1) above, the connecting piece covers the central conductor conduction terminal and the central conductor of the shielded wire that are exposed between the first crimp barrel portion and the second crimp barrel portion. The connecting piece can perform a shielding function. As a result, this shield improvement effect can be realized with an inexpensive and simple configuration.
According to the coaxial cable connector having the configuration (2), the connection state between the central conductor conduction terminal covered with the connecting piece and the core wire of the shielded electric wire can be visually confirmed through the open portion.

  According to the coaxial cable connector of the present invention, sufficient shielding performance can be obtained when impedance matching is performed in the entire coaxial connector.

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

It is a disassembled perspective view which shows the connector for coaxial cables of embodiment of this invention. It is a perspective view which shows the connector for coaxial cables in FIG. It is a top view which shows the shape before shaping | molding of the shield terminal in FIG.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
FIG. 1 is an exploded perspective view of the coaxial cable connector, FIG. 2 is a perspective view showing a completed state of the coaxial cable connector, and FIG. 3 is a plan view before molding the shield terminal shown in FIG.

  As shown in FIG. 1, a coaxial cable (shielded wire) W connected to the coaxial cable connector of the present embodiment includes a core wire W1 that is an internal conductor and the longitudinal direction of the core wire W1 while surrounding the outer peripheral surface of the core wire W1. An insulator (dielectric or inner coating) W2 extending in the direction, a shield conductor (shield member) W3 extending in the longitudinal direction while surrounding the outer peripheral surface of the insulator W2, and an outer peripheral surface of the shield conductor W3 And a sheath W4 (external coating) extended in the longitudinal direction.

  Further, the coaxial cable connector 10 of the present embodiment is a connector for a shielded electric wire W, and includes a center conductor conduction terminal 20 connected to the core wire W1 and a center conductor conduction terminal 20 electrically connected to the core wire W1. Are provided in the receiving hole 31, and a shield terminal 40 to which the insulating member 30 is crimped and to which the shield conductor W3 is connected is provided.

  The center conductor conduction terminal 20 has an electrical connection portion 21 electrically connected to the core wire of the shielded electric wire on the connection partner side on the forward side in the insertion direction to the insulating member 30, and on the other hand, the insertion direction to the insulating member 30. On the opposite side, a core wire connection portion (not shown) that is electrically connected to the core wire W1 of the shielded electric wire W is provided.

  The shield terminal 40 is formed by press-molding a conductive metal plate. As shown in FIG. 1, the shield terminal 40 has an insulating member 30 (provided that the insulating member 30 is a central conductor conduction terminal 20) at one end of a bottom plate portion 41 that is long along the axial direction of the shielded electric wire W. A cylindrical portion 42 is provided, and the other end portion is electrically connected to the shield conductor W3 of the shielded electric wire W. The shield conductor connecting portion 43 to be operated is provided as the second crimp barrel portion.

  As shown in FIG. 1, the shield conductor connecting portion 43 of the shield terminal 40 is electrically connected to the shield conductor W3 by crimping the shield conductor W3 at one end of the shielded electric wire W. The shield conductor connecting portion 43 has a shape in which the side wall portions 43A and 43B located at the left and right ends (both ends in the width direction) of the bottom plate portion 41 are raised in a U shape upward.

  In the shield terminal 40, a crimp barrel portion (first crimp barrel portion) 44 is formed between the cylindrical portion 42 and the shield conductor connection portion 43. The pressure-bonding barrel portion 44 includes side wall portions 44A and 44C located at both left and right ends of the bottom plate portion 41, and ceiling wall portions 44B and 44D extending from the side wall portions 44A and 44C, respectively. In order to fix the insulating member 30, which is an insulator, to the shield terminal 40, the side wall portions 44 </ b> A and 44 </ b> C and the ceiling wall portions 44 </ b> B and 44 </ b> D are bent inward so as to wrap the insulating member 30, so It is crimped by crimping.

  In addition, a rear end of the crimping barrel portion 44 (an end portion on the forward side in the insertion direction) is provided between the crimping barrel portion (first crimping barrel portion) 44 and the shield conductor connection portion (second crimping barrel portion) 43. ) And the front end of the shield conductor connecting portion 43 (the end on the opposite side of the shield conductor connecting portion) are connected to the crimping barrel portion 44 and the shield conductor connecting portion 43 integrally. ing. More specifically, the connecting piece 45 has one end connected to the ceiling wall portion 44 </ b> B constituting the crimping barrel portion 44 and the other end connected to the side wall portion 43 </ b> A constituting the shield conductor connecting portion 43. As shown in FIG. 2, the connecting piece 45 is connected to the crimping barrel portion 44 and the shield conductor connecting portion 43 at a position where the crimping barrel portion 44 is connected to the insulating member 30 and each shield conductor connecting portion 43. In the state in which each of the shield conductors W3 is crimped, it is desirable that the center portion of the bottom plate portion 41 is substantially vertical, that is, the connection portion between the core wire W1 and the central conductor conduction terminal 20 is substantially vertical. When in this positional relationship, the connecting piece 45 covers the central conductor conduction terminal 20 and the core wire W <b> 1 of the shielded electric wire W that are exposed between the crimp barrel portion 44 and the shield conductor connection portion 43. In addition, as long as the connecting piece 45 is located on the opposite side of the core plate W1 from the bottom plate portion 41, the shielding performance can be improved.

  In addition, the shield terminal 40 is formed with a connecting piece 45, whereby a bottom plate portion 41, a crimp barrel portion 44, a shield conductor connecting portion 43, and an open portion 47 that is a hole surrounded by the connecting piece 45. Is formed. In the present invention, the opening 47 is not essential, that is, a metal plate may be provided so as to fill the opening 47 (in other words, the end in the width direction of the connecting piece 45 extends to the bottom plate 41 and is integrated. May be.) However, when the connecting piece 45 is provided in a state where the open portion 47 is buried, after crimping the crimping barrel portion 44 and the shield conductor connection portion 43, the center conductor conduction terminal 20 and the core wire W1 of the shielded electric wire W are connected to each other. The connection state cannot be visually recognized. For this reason, the open part 47 is provided in order to visually recognize the connection state after the assembly of the coaxial cable connector 10 and the shielded electric wire W. In addition, the bottom plate portion 41 is provided with an opening hole 49 as a work space. The opening hole 49 is also used for visually confirming the connection state after the coaxial cable connector 10 and the shielded electric wire W are assembled.

  The connecting piece 45 is formed in a width dimension and a form (for example, a bent portion) in which the shielding effect with respect to the core wire W1 and the center conductor conducting terminal 20 exposed between the crimp barrel portion 44 and the shield conductor connection portion 43 is optimal. Is done. Also, a plurality of connecting pieces 45 can be provided.

  The shield terminal 40 is formed by punching a conductive metal plate 40A with a press as shown in FIG. The conductive metal plate 40A is formed with a flat portion 42A on the left side of FIG. 3, and the cylindrical portion 42 is formed by rounding the flat portion 42A in a cylindrical shape in the left-right direction (in the width direction). A concave portion 42B and a convex portion 42C that are fitted to each other are formed at both ends in the width direction of the flat portion 42A. In addition, a bottom plate portion 41 is formed on the right side of FIG. 3 in the conductive metal plate 40 </ b> A, and a crimp barrel portion 44 and a shield conductor connection portion 43 are formed at both ends in the width direction of the bottom plate portion 41. Further, between the crimp barrel portion 44 and the shield conductor connection portion 43, the rear end (end portion on the forward side in the insertion direction) of the crimp barrel portion 44 and the front end of the shield conductor connection portion 43 (on the opposite side of the shield conductor connection portion). The connecting piece 45 is provided so as to bridge the end portion. Further, the shield terminal 40 is formed with an open portion 47 that is a hole surrounded by a bottom plate portion 41, a crimp barrel portion 44, a shield conductor connection portion 43, and a connecting piece 45. Further, the bottom plate portion 41 has an opening hole 49 in the center thereof.

  The crimp barrel portion 44 of the shield terminal 40 of the present embodiment is applied to the insulating member 30 by subjecting a pair of crimp barrel portions formed in a complementary shape and having a point-symmetrical relationship to each other to a predetermined bending process. Before the crimping, as shown in FIG. 1, it has a substantially C-shaped cross section that expands upward from each other. After the crimping, as shown in FIG. 2, the top end side ceiling wall portions 44 </ b> B and 44 </ b> D are formed. By bending and closing each other up to a right angle with respect to the side wall portions 44A and 44C, the ceiling wall portions 44B and 44D are connected horizontally without interfering with each other.

  Here, the pressure-bonding barrel portion of the pressure-bonding barrel portion 44 immediately before the pressure bonding will be further described. As shown in FIG. 1, a pair of side wall portions 44A and 44C rising from the bottom plate portion 41 and the side wall portions 44A, respectively. 44C, a pair of ceiling wall portions 44B and 44D inclined inward from the upper end of 44C, and the crimping method of the present invention to be described later is reliably applied to the boundary portion between the side wall portion 44A and the ceiling wall portion 44B. A concave groove 44E is provided in order to execute the desired action.

  The side wall portions 44A and 44C rise upward from both sides of the bottom plate portion 41 inward by a predetermined first angle (a predetermined angle inward with respect to the horizontal direction parallel to the bottom plate portion 41). In this case, it is bent so as to be perpendicular to the bottom plate portion 41.

  The ceiling wall portions 44B and 44D are centered on the grooves formed at portions separated from the respective boundary portions of the bottom plate portion 41 and the side wall portions 44A and 44C by a predetermined length toward the front end direction of the side wall portions 44A and 44C. Thus, they are formed to be bent so as to be inclined at a predetermined angle toward the opposite side wall portions 44A and 44C. The bending process for forming the ceiling wall portions 44B and 44D is performed in advance until immediately before performing the crimping process, but in the subsequent crimping process, as shown in FIG. Further bending processing is additionally performed so as to be in a horizontal state parallel to the bottom plate portion 41.

  On the other hand, the shield conductor connecting portion 43 as the second crimping barrel portion is curved so that the side wall portions 43A and 43B are raised upward in the U shape at the left and right ends of the bottom plate portion 41 as described above. . In this bending process, the side wall portions 43A and 43B are pressed onto the shield conductor W3 so as to overlap each other at the top.

Next, a procedure for attaching the shield terminal 40 to the insulating member 30 and the coaxial cable W will be described.
First, the side walls 44 </ b> A and 44 </ b> C are bent so that the bottom plate 41 of the shield terminal 40 stands up from both sides in the left-right direction (width direction) by a predetermined angle. Further, the concave groove (or a recess may be provided) at a portion returned from the distal end of the side wall portions 44A, 44C in the proximal direction by a certain length (for example, slightly longer than half of the width in the width direction of the bottom plate portion 41). , And the other side walls 44A and 44C are bent toward each other in a closing direction by a predetermined angle. In addition, ceiling wall portions 44B and 44D are formed in advance on the front end sides of the side wall portions 44A and 44C. Thereby, the shield terminal 40 in the state as shown in FIG. 1 is formed.

  Thereafter, the shielded electric wire W to which the central conductor conducting terminal 20 and the insulating member 30 shown in FIG. 1 are attached is set at a predetermined position of the shield terminal 40. In particular, the distal end portion of the insulating member 30 is inserted into a predetermined position of the cylindrical portion 42. Next, the crimp barrel portion 44 and the shield conductor connection portion 43 are respectively placed on the upper surface of each prepared anvil (not shown), and the anvil on which the crimp barrel portion 44 and the shield conductor connection portion 43 are mounted is mounted. Lower the crimper as a crimping tool.

  Thereby, the side wall portions 44A and 44C are bent, and the side wall portions 43A and 43B are curved. At this time, the side walls 44 </ b> A and 44 </ b> C are bent to a state in which the side walls 44 </ b> A and 44 </ b> C are bent at approximately 90 degrees with respect to the bottom plate 41 in the horizontal direction parallel thereto. On the other hand, the side wall portions 43A and 43B are curved into a substantially U shape together with the bottom plate portion 41.

  Next, the ceiling wall portions 44B and 44D are bent while being pressed until they come into contact with the insulating member 30 to be crimped by the crimper. Thereby, both ceiling wall parts 44B and 44D are in contact with the insulating member 30, and are bent to an angle substantially perpendicular to the side wall parts 44A and 44C. On the other hand, when the distal ends of the side wall portions 43A and 43B of the shield conductor connecting portion 43 are bent by another crimper, the distal ends are bent so as to overlap each other.

  Further, the portions that come into contact with the insulating member 30 and the shield conductor W3 are bent and bent in a direction in which they are crimped. Thus, a series of caulking and crimping operations so far are completed. That is, a series of caulking and crimping operations so far are finished when the tip ends of the ceiling wall portions 44B and 44D are slightly bent downward.

  Thus, the coaxial cable W and the shield terminal 40 are assembled as shown in FIG. 2 to complete the coaxial cable connector. In this assembling operation, since the crimping barrel portion 44 and the shield conductor connecting portion 43 are connected to the connecting piece 45, the side wall portions 44A and 44C, the ceiling wall portions 44B and 44D, the side wall portions 43A and 43B, Are simultaneously pressed and curved by the corresponding anvils and crimpers.

  As described above, according to the present invention, the connecting piece 45 connected between the two crimping barrel portions 44 and 43 for crimping the insulating member (dielectric material) 30 and the shield conductor W3 is connected to the crimping barrel portion 44 and the shield conductor connecting portion. By covering the central conductor conducting terminal 20 exposed between the core wires 43 and the core wire W1 of the shielded electric wire W, a shielding function can be achieved.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

DESCRIPTION OF SYMBOLS 10 Connector for coaxial cables 20 Center conductor conduction | electrical_connection terminal 21 Electrical connection part 30 Insulation member 40 Shield terminal 41 Bottom plate part 42 Cylindrical part 43 Shield conductor connection part (2nd crimping barrel part)
44 Crimp barrel (first crimp barrel)
44A, 44C Side wall 44B, 44D Ceiling wall 44E Groove (or depression)
45 Connecting piece W Coaxial cable (shielded wire)
W1 core wire (center conductor)
W2 Insulator W3 Shield conductor

Claims (2)

A central conductor conducting terminal connected to the central conductor of the shielded electric wire; a shield terminal connected to the shield conductor of the shielded electric wire; and an insulating member interposed between the central conductor conducting terminal and the shield terminal. A coaxial cable connector,
The shield terminal includes a bottom plate portion, a first crimp barrel portion erected from an end in the width direction of the bottom plate portion, and holding the insulation member by crimping the insulation member, and the shield conductor. A second crimping barrel portion that is connected to the shield conductor by caulking and is erected from an end portion in the width direction of the bottom plate portion, an end portion of the first crimping barrel portion, and the second crimping portion A linking piece that bridges the end of the barrel portion,
When the first crimping barrel portion and the second crimping barrel portion are crimped, the connecting piece is continuously provided on a substantially vertical connection portion between the center conductor and the center conductor conduction terminal, Covering the central conductor conduction terminal and the central conductor of the shielded wire exposed between the first crimp barrel part and the second crimp barrel part,
A coaxial cable connector characterized by the above. The shield terminal is formed with an open portion surrounded by the bottom plate portion, the first crimp barrel portion, the second crimp barrel portion, and the connecting piece.
The coaxial cable connector according to claim 1.

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