JP6919642B2 - Electrical connector - Google Patents

Description

The present invention relates to an electrical connector that connects to a shielded cable having an outer conductor and an inner conductor.

Conventionally, there are known electric connectors that connect to a shielded cable and reduce signal transmission loss due to reflection or the like by matching the characteristic impedance. The shield cable connected to such an electric connector includes an inner conductor, an inner insulator that covers the outer periphery of the inner conductor, an outer conductor that covers the outer periphery of the insulator, and an outer insulator that covers the outer periphery of the outer conductor. It is equipped with an external conductor that blocks electrical influences from the outside, enabling high-frequency propagation. Further, the electric connector connected to such a shielded connector includes a shell connected to the outer conductor of the shielded cable, a terminal connected to the inner conductor of the shielded cable, and a dielectric material that holds the terminal and is housed in the shell. It has.

Further, since the connection portion between the terminal of the electric connector and the inner conductor of the shielded cable has a size and shape that prioritizes electrical connection reliability, the transmission line and the characteristic impedance may be inconsistent. In this case, the transmitted electrical signal is reflected or radiated, causing problems such as the signal not being transmitted correctly or causing noise, and this tendency is particularly remarkable in the transmission of high-frequency signals. Become.

On the other hand, Patent Document 1 is a shield connector having a dielectric 12 in which the inner conductor terminal 11 is housed, an outer conductor terminal 13 in which the dielectric 12 is housed, and a small diameter body 14 attached to the dielectric 12. Is disclosed. In the shield connector of Patent Document 1, by providing the small diameter body 14 around the crimping portion 11c, the characteristic impedance matching with the shielded cable can be achieved in the crimping portion 11c which is the mismatched portion of the characteristic impedance.

Japanese Unexamined Patent Publication No. 2003-163058

However, in Patent Document 1, since the upper part of the crimping portion 11c is not covered by the outer conductor terminal 13 and the small diameter portion 14, it is exposed to the outside, and the shielding property is inferior and the characteristic impedance is sufficiently matched. Has the problem of not being able to. Further, Patent Document 1 does not mention a configuration in which various shielded cables having different thicknesses or the number of signal lines can be connected while matching the characteristic impedance without increasing the cost, and is improved in this respect. There is room for.

An object of the present invention is to obtain good shielding performance, to sufficiently match the characteristic impedance, and to suppress an increase in cost even when connecting different types of cables. Is to provide an electrical connector that can.

The electric connector according to the present invention is an electric connector that connects to a shield cable having an outer conductor and an inner conductor, and has a conductive contact that connects to the inner conductor and an insulating holding member that holds the contact. An inner shield member provided on the outer periphery of the holding member and having conductivity connected to the outer conductor, and an inner shield member provided between the outer shield member and the holding member. The inner shield member includes a tubular main body portion that covers the holding member, and a pressure contact portion that extends outward from the main body portion and presses against the outer shield member. ..

The pressure contact portion of the inner shield member is pressed by the outer shield member between the holding member and the outer shield member to elastically deform, and is connected to the outer shield member to be connected to the inner conductor of the shielded cable. The terminal is shielded by an outer shield member and an inner shield member connected to the outer conductor of the shielded cable.

According to the present invention, good shielding performance can be obtained, characteristic impedance can be sufficiently matched, and cost increase can be suppressed even when different types of cables are connected. Can be done.

It is an exploded perspective view of the electric connector which concerns on embodiment of this invention. It is sectional drawing of the electric connector which concerns on embodiment of this invention. It is sectional drawing side view of the electric connector which concerns on embodiment of this invention. It is a top view of the holder of the electric connector which concerns on embodiment of this invention. It is a side view of the holder of the electric connector which concerns on embodiment of this invention. FIG. 4 is a cross-sectional view taken along the line AA of FIG. It is a side view of the insulator of the electric connector which concerns on embodiment of this invention. It is a top view of the insulator of the electric connector which concerns on embodiment of this invention. It is a side view of the shield contact of the electric connector which concerns on embodiment of this invention. It is a front view of the shield contact of the electric connector which concerns on embodiment of this invention. FIG. 10 is a cross-sectional view taken along the line BB of FIG. It is a top view of the shield case of the electric connector which concerns on embodiment of this invention. FIG. 12 is a cross-sectional view taken along the line CC of FIG.

Hereinafter, the electric connector according to the embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the figure, the x-axis, y-axis, and z-axis form a three-axis Cartesian coordinate system, with the positive direction of the y-axis being the forward direction, the negative direction of the y-axis being the backward direction, the positive direction of the x-axis being the left direction, and x. The negative direction of the axis will be described as the right direction, the positive direction of the z-axis will be described as the upward direction, and the negative direction of the z-axis will be described as the downward direction.

<Electrical connector configuration>
The configuration of the electric connector 1 according to the embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 13.

The electric connector 1 is connected to the shielded cable 100. The shielded cable 100 has a plurality of signal lines 101, an outer conductor 102 that covers the plurality of signal lines 101, and an outer insulator 103 that covers the outer conductor 102. Each of the plurality of signal lines 101 has an inner conductor 104 and an internal insulator 105 that covers the inner conductor 104.

Specifically, the electric connector 1 has a holder 10, an insulator 20, a terminal 30, a sleeve 40, a shield cover 50, a shield case 60, a shield contact 70, and a housing 80. ..

The holder 10 is made of an insulating material. The holder 10 includes a front portion 11 and a rear portion 12 provided behind the front portion 11, and a recess 13 is provided at the rear end by providing the rear portion 12 with a step with respect to the front portion 11. Is forming. The recess 13 is recessed toward the crimping portion 32 around the crimping portion 32 described later.

The front portion 11 includes an insertion groove 111, a locking groove 112, and a positioning hole 113.

The insertion groove 111 is recessed in the upper surface of the holder 10 and extends in the front-rear direction from the front end to the rear end of the holder 10. A plurality of insertion grooves 111 are provided in parallel with each other, and are arranged so as to be spaced apart from each other in the left-right direction.

The locking groove 112 is recessed in each of the facing side walls constituting the insertion groove 111, and the locking piece 31 of the terminal 30 is locked.

The positioning hole 113 is recessed between the insertion grooves 111 adjacent to each other on the upper surface of the holder 10.

The rear portion 12 includes a holding portion 121 that is recessed in the upper surface and communicates with the insertion groove 111, and a positioning hole 122 that is provided between the holding portions 121 that are adjacent to each other. The positioning hole 122 has a shape different from that of the positioning hole 113.

The insulator 20 is made of an insulating material. The insulator 20 includes a front portion 21 that sandwiches the terminal 30 with the front portion 11 of the holder 10, and a rear portion 22 that is provided behind the front portion 21 and faces the rear portion 12 of the holder 10. , The position determination protrusion 24 that protrudes downward from the lower surface of the insulator 20 and fits into the position determination hole 113 of the holder 10, and the position determination that protrudes downward from the lower surface of the insulator 20 and fits into the position determination hole 122 of the holder 10. A recess 23 is formed at the rear end by providing the protruding portion 25 and the rear portion 22 with a step with respect to the front portion 21. The recess 23 is recessed toward the crimping portion 32 around the crimping portion 32 described later.

The rear portion 12 and the rear portion 22 form a covering portion that covers the crimping portion 32 of the terminal 30.

The terminal 30 is inserted into the insertion groove 111 of the holder 10 and is sandwiched and held by the holder 10 as a holding member and the insulator 20. The terminal 30 includes a locking piece 31 and a crimping portion 32.

A pair of locking pieces 31 are provided in the front-rear direction, and the side walls of the terminal 30 are cut up and raised outward, and the locking pieces 31 are locked in the locking groove 112 in the front-rear direction of the terminal 30 with respect to the holder 10. It regulates the movement of.

The crimping portion 32 is provided at the rear end of the terminal 30 and is crimped to the inner conductor of the shielded cable 100. The crimping portion 32 is covered by the rear portion 12 and the rear portion 22, and is held in the space between the holding portion 121 of the holder 10 and the insulator 20.

The sleeve 40 is made of a conductive material and has a tubular shape, and is provided between the outer conductor 101 of the shielded cable 100 and the insulator 102 and is connected to the outer conductor 101.

The shield cover 50 is made of a conductive material, covers the rear end of the shield case 60, and is connected to the shield case 60.

The shield case 60 as an outer shield member is formed of a conductive material and has a rectangular tubular shape, and houses a holder 10, an insulator 20, a terminal 30, a sleeve 40, and a shield contact 70. The shield case 60 includes a protruding portion 61, a tubular portion 62, a constricted portion 63, and a crimping portion 64.

The protruding portions 61 project forward from the front end of the side wall portion 623 of the tubular portion 62, and are provided in pairs. The protruding portion 61 is provided with an engaging piece 611 that engages with an engaging portion (not shown) of the housing 80 by cutting it inward.

The tubular portion 62 covers the periphery of the holder 10 and the insulator 20 by the upper wall portion 621, the lower wall portion 622, and the side wall portion 623.

The constricted portion 63 is provided behind the tubular portion 62, and the width of the tubular portion 62 in the left-right width direction is narrowed to constrict. The constricted portion 63 is U-shaped when viewed from the front, and the upper portion is open to the outside.

The crimping portion 64 is crimped to the outer conductor of the shielded cable 100.

The shield contact 70 as the inner shield member is formed of a conductive material and has a rectangular shape. The shield contact 70 is provided between the holder 10 and the insulator 20 and the shield case 60, is provided on the outer peripheral side of the rear portion 12 and the rear portion 22, and is provided in the recess 13 of the holder 10 and the recess of the insulator 20. It is provided in 23. The shield contact 70 includes a main body portion 71, a pressure contact portion 72, a side regulation portion 73, a front regulation portion 74, and a connection portion 75.

The main body 71 has a tubular shape and covers the rear portion 12 of the holder 10 and the rear portion 22 of the insulator 20.

The pressure contact portion 72 is folded forward from the rear end of the main body portion 71 and extends forward and outward, and is in a cantilever state. The pressure contact portion 72 is provided so as to overlap the main body portion 71 when viewed from above or below. The pressure contact portion 72 is connected to the upper wall portion 70a of the main body portion 71 and is provided above the main body portion 71, and is connected to the lower wall portion 70b of the main body portion 71 to be below the main body portion 71. It is composed of a lower pressure contact portion 72b provided in the above.

The upper pressure contact portion 72a faces the upper wall portion 70a, and the tip side is in the upward direction opposite to the pressing direction of the shield case 60 against the upper pressure contact portion 72a from the side regulation portion 73 and the front regulation portion 74. Is also prominent. The lower pressure contact portion 72b faces the lower wall portion 70b, and the tip side is in the downward direction opposite to the pressing direction of the shield case 60 against the lower pressure contact portion 72b from the side regulation portion 73 and the front regulation portion 74. Is also prominent. The upper pressure contact portion 72a includes a curved portion 721a having a convex shape upward toward the tip end side. The lower pressure contact portion 72b is provided with a curved portion 721b having a convex shape downward toward the tip end side.

The side regulation portions 73 are erected upward from the upper wall portion 70a of the main body portion 71 and downward from the lower wall portion 70b of the main body portion 71 on the left and right sides of the pressure contact portion 72. In a state where the pressure contact portion 72 is not pressed, the pressure contact portion 72 is provided inward (on the main body portion 71 side) of the tip side of the pressure contact portion 72.

The front regulating portion 74 is provided at the front end of the shield contact 70 in front of the pressure contact portion 72. The front regulating portion 74 includes an upper front regulating portion 74a erected upward from the upper wall portion 70a of the main body portion 71 and a lower portion erected downward from the lower wall portion 70b of the main body portion 71. It is composed of a front regulation unit 74b and a front regulation unit 74b.

The connecting portion 75 projects inward from the inner wall surface of the upper wall portion 70a of the main body portion 71 and the inner wall surface of the lower wall portion 70b, and is in pressure contact with the holder 10 and the insulator 20.

The housing 80 is made of an insulating material and houses a holder 10, an insulator 20, a terminal 30, a sleeve 40, a shield cover 50, a shield case 60, and a shield contact 70.

<How to assemble an electrical connector>
The method of assembling the electric connector 1 according to the embodiment of the present invention will be described in detail below.

First, after inserting the shielded cable 100 into the shielded case 60, the outer insulator 103 at the end of the shielded cable 100 is removed to expose the inner conductor 102, and the inner conductor 102 is folded back on the outer insulator 103.

Next, the inner conductor 104 of the signal line 101 is crimped to the crimping portion 32 of the terminal 30.

Next, the shield case 60 in which the terminal 30 is crimped is inserted into the shield contact 70.

Next, the terminal 30 is inserted into the insertion groove 111 of the holder 10 from above. At this time, the locking piece 31 of the terminal 30 engages with the locking groove 112 of the holder 10 to restrict the movement of the terminal 30 in the insertion groove 111 in the front-rear direction.

Next, the insulator 20 is put on the upper surface of the holder 10 from above, the positioning protrusion 24 of the insulator 20 is fitted into the positioning hole 113 of the holder 10, and the positioning protrusion 25 of the insulator 20 is fitted to the holder 10. By fitting into the positioning hole 122, the terminal 30 is sandwiched between the holder 10 and the insulator 20. At this time, the position determination hole 113 and the position determination hole 122 have different shapes, and the position determination protrusion 24 and the position determination protrusion 25 have different shapes, so that the insulator 20 is erroneously attached to the holder 10. It is possible to prevent the cover from being covered in the vertical direction. Further, the terminal 30 having the pair of locking pieces 31 can be easily held by the holder 10 and the insulator 20.

Next, the shield contact 70 is attached to the recess 13 of the holder 10 and the recess 23 of the insulator 20, and the rear portion 11 of the holder 10 and the rear portion 12 of the insulator 20 are covered by the main body 71 of the shield contact 70.

Next, after the sleeve 40 is put on the outer conductor 105 of the signal line 101 and crimped, the inner conductor 102 folded back on the outer insulator 103 is put on the sleeve 40.

Next, the shield case 60 is placed on the holder 10, the insulator 20, and the shield contact 70. At this time, the pressure contact portion 72 of the shield contact 70 is pressed by the shield case 60 and elastically deforms inward, and is pressed against the shield case 60 by its own spring property.

Here, by providing the side regulating portion 73 and the front regulating portion 74 on the shield contact 70, when a large load is applied to the pressure contact portion 72, the shield case 60 is moved to the side regulating portion 73 or the front regulating portion 73. Since the load applied from the shield case 60 to the shield contact 70 is regulated in contact with the 74, plastic deformation or breakage of the pressure contact portion 72 can be prevented. Further, by providing the pressure contact portion 72 so as to overlap the main body portion 71 when viewed from above or below, the shield contact 70 can be made compact, so that the increase in size of the electric connector 1 can be suppressed. Further, since the spring span having a sufficient length can be obtained by making the pressure contact portion 72 in a cantilever state, the pressure contact portion 72 can be brought into contact with the shield case 60 with a desired pressure contact force.

Next, after the shield cover 50 is attached to the shield case 60, the shield cover 50, the shield case 60, and the shield cable 100 are crimped together. As a result, the mounting strength of the shield cover 50 with respect to the shield case 60 can be improved, and the electrical connection reliability can be ensured.

Next, the housing 80 is put on the shield cover 50 and the shield case 60 to complete the assembly.

<Electrical characteristics of electrical connectors>
In the electric connector 1 having the above configuration, the connection portion between the inner conductor 104 of the shielded cable 100 and the crimping portion 32 of the terminal 30 has a size and shape that prioritizes electrical connection reliability, but this connection. The shielded cable 100 is provided by providing a shield contact 70 in the recess 13 around the rear portion 12 and the recess 23 around the rear portion 22 where the portion is located, and covering the entire circumference of the rear portion 12 and the rear portion 22 with the shield contact 70. It is possible to sufficiently match the characteristic impedance with and to obtain good shielding performance.

Here, when the shield contact 70 is not provided, the shield case is narrowed down in order to match the characteristic impedance in a place where the characteristic impedance is likely to be discontinuous, such as a place where the internal conductor 104 is crimped to the terminal 30. This complicates the shape of the shield case. On the other hand, in the present embodiment, by providing the shield contact 70, it is possible to eliminate the need for the shield case 60 to have a narrowed shape, and the shield case 60 has a simple tubular structure with less unevenness. be able to.

Further, since the terminal 30 is sandwiched between the holder 10 and the insulator 20, the gap between the terminal 30 and the holder 10 and the gap between the terminal 30 and the insulator 20 can be minimized, and the shielded cable 100 can be minimized. The matching of the characteristic impedance with and can be improved. In particular, in the crimping portion 32 where the internal conductor 104 having a complicated shape is crimped, the gap between the holder 10 and the insulator 20 can be minimized, and the matching of the characteristic impedance with the shielded cable 100 is improved. Can be done.

Further, even if the shape of the shield case is changed when the shield case has to be enlarged for some purpose, the shield case 70 can be provided to connect to the shield case. It is possible to make the shape of the cable into a tubular shape with less unevenness without complicating the shape of the cable, and it is possible to improve the matching of the characteristic impedance with the shielded cable 100 without changing the shape of other members.

Further, by covering the entire circumference of the connection portion between the inner conductor 104 of the shielded cable 100 and the crimping portion 32 of the terminal 30 with the rear portion 12 of the holder 10 and the rear portion 22 of the insulator 20, the matching of the characteristic impedance is good. Can be.

Further, even when connecting to various shielded cables having a thickness different from that of the shielded cable 100 or the number of signal lines, it can be absorbed by the amount of elastic deformation of the pressure contact portion 72 of the shield contact 70, so that the shield can be shielded. Since it is not necessary to change the size and shape of the case 60 and it is not necessary to change the size and shape of the shield contact 70, the cost can be reduced.

If a shielded cable with a significantly different thickness or number of signal lines from the shielded cable 100 is connected, or if the position of a ground (GND) component such as the shielded case 60 changes, the shape and size of the shielded case 60 Since it can be dealt with only by changing the size of the shield contact 70 without changing the size, the cost can be reduced.

As described above, according to the present embodiment, the tubular main body 71 covers the periphery of the rear portion 12 and the rear portion 22, and the pressure contact portion 72 extending outward from the main body 71 is the shield case 60. Good shielding performance can be obtained by pressure welding to, and the characteristic impedance can be sufficiently matched, and even when connecting different types of cables, the cost is not increased. Good shielding performance can be obtained, and the characteristic impedance can be sufficiently matched.

Further, according to the present embodiment, by elastically contacting the pressure contact portion 72 of the shield contact 70 with the shield case 60, high connection reliability can be obtained against distortion, vibration and stress relaxation due to external force or dimensional deviation. ..

The present invention is not limited to the above-described embodiment in terms of the type, arrangement, number, etc. of the members, and the constituent elements thereof are appropriately replaced with those having the same effect and effect, as long as the gist of the invention is not deviated. Of course, it can be changed as appropriate.

Specifically, in the above embodiment, the shield case 60 and the shield contact 70 are rectangular, but may be circular.

Further, in the above embodiment, although it is connected to the shielded cable 100 having a plurality of signal lines 101, it may be connected to a shielded cable including one signal line 101 or three or more signal lines 101.

Further, in the above embodiment, the shield contact 70 is provided around the crimping portion 32, but the shield contact 70 can be provided at an arbitrary position other than the crimping portion in order to match the characteristic impedance.

Further, in the above embodiment, the terminal 30 is sandwiched and held by the holder 10 and the insulator 20, but the terminal may be inserted into the insulator and held.

Further, in the above embodiment, the terminal 30 is sandwiched from above and below by the holder 10 and the insulator 20, but when only one terminal 30 is provided, the terminal 30 may be sandwiched from the left and right by the holder and the insulator. ..

The electrical connector according to the present invention is suitable for connecting to a shielded cable having an outer conductor and an inner conductor.

1 Electrical connector 10 Holder 11 Front part 12 Rear part 13 Recessed part 20 Insulator 21 Front part 22 Rear part 23 Recessed part 24 Positioning protruding part 25 Positioning protruding part 30 Terminal 31 Locking piece 32 Crimping part 40 Sleeve 50 Shielded cover 60 Shielded case 61 Protruding part 62 Cylindrical part 63 Constriction part 64 Crimping part 70 Shielded contact 71 Main body part 72 Pressure welding part 72a Upper pressure welding part 72b Lower pressure welding part 73 Side regulation part 74 Front regulation part 74a Upper front regulation part 74b Lower front regulation part 75 Connection 80 Housing 100 Shielded cable 101 Signal line 102 External conductor 103 External insulator 104 Internal conductor 105 Internal insulator 111 Insertion groove 112 Locking groove 113 Positioning hole 121 Holding part 122 Positioning hole 611 Engagement piece 621 Upper wall part 622 Lower wall part 623 Side wall part 721a Curved part 721b Curved part

Claims (4)

An electrical connector that connects to a shielded cable that has an outer conductor and an inner conductor.
A conductive terminal connected to the inner conductor,
An insulating holding member that holds the terminal and
A tubular outer shield member provided on the outer circumference of the holding member and having conductivity connected to the outer conductor,
An inner shield member provided between the outer shield member and the holding member,
Have,
The inner shield member is
It includes a tubular main body portion that covers the holding member, and a pressure contact portion that extends outward from the main body portion and presses against the outer shield member.
An electrical connector that features that. The terminal
A crimping portion for crimping to the inner conductor is provided.
The holding member is
A covering portion that covers the crimping portion is provided.
The inner shield member is
Covering the covering
The electric connector according to claim 1. The holding member is
It is composed of two members that sandwich the terminal from above and below or from the left and right.
The electric connector according to claim 1 or 2. The inner shield member is
It has a regulating portion that is erected from the main body portion in a direction opposite to the pressing direction of the outer shield member against the pressure contact portion around the pressure contact portion.
The pressure contact portion is
It is provided so as to overlap the main body portion when viewed from the pressing direction and is in a cantilevered state, and the tip protrudes from the restricting portion in the opposite direction.
The electric connector according to any one of claims 1 to 3.

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