JP2003257560A - Shield connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield connector matching the impedance in a connector, has little transmission loss of signals caused by reflection, and is excellent in terminal processing for a cable. <P>SOLUTION: With the shield connector of a structure in which, in mounting an inner conductor terminal 11 crimped and connected to a signal conductor Wa of a shielded cable W with the use of a space (an opening 13b) with a top face of an outer conductor terminal 13 opened, a crimped part 11c that is a connecting part the signal conductor Wa and the inner conductor terminal 11 is exposed inside the opening 13b, a convex wall 15 is set at an inner bottom face of the opening 13b close to the crimped part 11c exposing the opening 13b, and characteristics impedance of the connector is made to match even in the vicinity of the crimped part 11c. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to connecting a cable such as a wire harness to an electric device or the like of an automobile,
In particular, it relates to a shield connector connection structure for relay-connecting a shield cable to a printed circuit board or an antenna in the electric device.

[0002]

2. Description of the Related Art In recent years, electric signals transmitted to a control printed circuit board on which electronic parts, ICs (integrated circuits) and the like built in electric devices of automobiles such as car navigation systems are mounted have become faster (higher frequency). In addition, the board pattern of the printed board is also densely packed and densified. Generally, high-frequency compatible shielded cables are used to transmit such high-frequency electrical signals,
As the frequency of transmitted electric signals becomes higher, there is also a demand for miniaturization of the shielded connector for relay-connecting this shielded cable.

As a structure of the shielded cable, there is, for example, a so-called coaxial cable. In this cable, an insulator is usually interposed between a signal conductor in which a plurality of metal wires are twisted and bundled as a transmission path for electric signals and a shield conductor formed of a braided wire in which a plurality of wires are braided, It has a coaxial structure in which the outer circumference is also covered with an insulating sheath, and the shield conductor covers the outer circumference of the signal conductor at regular intervals with no gap, making it suitable for transmission of high-frequency electrical signals. Has become.

Generally, in a shielded connector having built-in terminals connected to both ends of a coaxial cable for transmitting such a high frequency signal, an inner conductor terminal connected to a signal conductor of the cable and a shield such as a braided wire. An outer conductor terminal that is connected to a conductor and that electromagnetically shields by covering the outer periphery of the inner conductor terminal; and a dielectric body having a predetermined dielectric constant provided between the inner conductor terminal and the outer conductor terminal. It is provided and is electrically connected individually to the signal conductor and the shield conductor exposed by stripping off the insulator and the sheath of the cable end to be connected.

An example of this shielded connector is disclosed in Japanese Utility Model Laid-Open No. 3-80982. FIG. 7A is a vertical cross section of the shield connector 70,
(B) is the figure which showed the BB cross section. In the shield connector 70 shown in the figure, the insulation conductor Wb and the sheath We of the coaxial cable W are stripped off to expose the signal conductor Wa and the shield conductor Wd. Position of the crimping portion 72a of the inner conductor terminal 72 and the crimping portion 73a of the outer conductor terminal 73 to which the conductor terminal 72 is assembled and the signal conductor Wa and the shield conductor Wd exposed by a predetermined length are crimp-connected. Place on. Then, by the crimping jig 75, both crimping portions 72
The connection is completed by collectively crimping a and 73a.

In this case, the crimp portion 72a of the inner conductor terminal 72
In order to crimp the signal conductor Wa to the outer conductor terminal 73, the opening 73 is opened at the upper and lower positions of the inner conductor terminal crimping portion 72a of the outer conductor terminal 73.
Since b and 73b are formed, it is possible to collectively crimp-connect the shield conductor Wd together with the shield conductor Wd, and automation of crimping connection by a machine is facilitated.

Further, there is one disclosed in Japanese Patent Laid-Open No. 2000-173725. 8A is a vertical cross section of the shield connector 80, and FIG. 8B is a view showing a CC cross section thereof. In the illustrated shield connector 80, the insulation conductor Wb of the coaxial cable W and the signal conductor Wa from which the sheath We is stripped off and the shield conductor Wb are first connected to the signal conductor Wa exposed by a predetermined length as an inner conductor. The crimp portion 82a of the terminal 82 is crimped and connected. After that, the inner conductor terminal 82 connected to the previous cable is pushed into the insertion hole 84a of the dielectric 84 previously assembled in the outer conductor terminal 83 to be mounted, and the inverted shield conductor Wd is placed on the sheath We of the cable. The outer conductor terminal 83 is placed on the crimp portion 83a. The connection is completed by crimping and fixing the sheath We and the shield conductor Wd together with a crimping jig (not shown).

In this case, the crimp portion 83a of the outer conductor terminal 83
When the inner conductor terminal 82 is attached to the dielectric body 84, which is the step before crimping and fixing the cable W by, the inner conductor terminal 82 is utilized by using the opening 83b opened in the outer conductor terminal 83 as a working space. It is possible to easily carry out the step of mounting the dielectric body 84 housed in the outer conductor terminal 83 using a pushing jig, and the assembly by a machine can be easily automated.

If the characteristic impedance of the shielded cable in the transmission of high-frequency electric signals does not match the input impedance of the circuits connected to both ends of this cable, signal reflection occurs. Since reflection causes noise and wastes energy transmission, the impedance of the transmission circuit is designed to be the same.
This is called impedance matching (impedance matching). Normally, the impedance is matched to the circuit board or the cable of the electric device by setting the impedance to 50Ω, for example, but the impedance is naturally matched to the shielded connector which is a part connecting the cables to each other or the board and the cable. Must have been done. If there is a part of the shielded connector where the impedance of the shield does not match the transmission path, there is a problem such as a decrease in transmission efficiency due to signal reflection at the unmatched part and the occurrence of noise and crosstalk. Will happen.

The characteristic impedance of a shielded connector is generally adjusted by adjusting the "ratio of inner diameter of outer conductor terminal to outer diameter of inner conductor terminal" and "relative permittivity of dielectric".
Although impedance matching with a shielded cable which is a transmission line is achieved, the diameters of the crimping portions 72a and 82a after crimping the inner conductor terminals 72 and 82 shown in FIGS. Since the size and shape give priority to the electrical connection reliability with the conductor Wa, the diameter is usually smaller than the diameter of the portion mounted on the dielectric. Therefore, in this crimp portion, the "ratio of the inner diameter of the outer conductor terminal to the outer diameter of the inner conductor terminal" is not the set ratio. Further, since the outer conductor terminals at these crimping portion positions have openings 73b and 83b opened for use as working spaces such as a crimping jig for the inner conductor terminal and a pushing jig, the crimping portion 72a , 82a are the outer conductor terminals or the dielectrics for shielding and are not covered in all directions and have a dielectric constant ε.
It has been opened to the air of = 1. Therefore, the characteristic impedance of this portion is higher than the impedance of the transmission line, and the characteristics are not matched.

In such a portion where the characteristic impedance of the shielded connector is not equal to that of the shielded cable, the electric signal transmitted as described above is reflected or radiated, so that the signal is not properly transmitted or is transmitted to other equipment. It may cause noise. In particular, this tendency is remarkable in the transmission of a high frequency signal of several GHz, and it is difficult for the structure of these shielded connectors to cope with a higher frequency.

As an improvement, in order to lower the characteristic impedance at the crimping portion of the inner conductor terminal so as to match the characteristic impedance of the shield cable and other portions of the connector, the crimping portion diameter of the inner conductor terminal after crimping is set. There is a method in which the impedance is matched by making it thick so that it can be used for transmission of higher frequency electric signals. Conventionally,
As a method of increasing the diameter of the pressure-bonding portion, a method of separately winding a metal tape around the pressure-bonding portion after pressure bonding or a method of further pressure-bonding a tubular metal sleeve from above has been adopted.

[0013]

However, the process of winding a metal tape to increase the diameter of the crimping portion is a manual operation, and in the case of a small connector, the crimping portion of the small inner conductor terminal after the crimping is extremely fine. Since it is performed for the above, the work is very complicated, the processing accuracy is not obtained, and it is difficult to reduce the cost by shortening the time for manufacturing the connector. In addition, if the metal tape should come off, it may come into contact with the outer conductor terminal and cause a short circuit, which makes it difficult to use in a severe environment.

The process of further crimping the cylindrical metal sleeve from above and increasing the diameter of the crimped portion after crimping can be carried out automatically by mechanizing the crimping process of the sleeve, so that it can be carried out at low cost. Although it seems possible, crimping of this metal sleeve will naturally be performed when processing the cable end when connecting the cable to the connector, so processing for exclusive use of crimping the metal sleeve is performed for each processing line at the automated cable end processing factory. It is necessary to prepare an additional machine separately, which in turn increases the cost. In addition, an increase in cost due to an increase in the number of parts and an increase in the number of processes is unavoidable.

Furthermore, since the thickness of the signal conductor changes depending on the type of cable and the thickness of the crimping piece of the inner conductor terminal crimped thereto also changes, the cross-sectional size of the crimping portion after crimping also changes. It is also necessary to change the size of the metal sleeve to be crimped, and it is difficult to achieve an appropriate impedance for various types of cables.

Further, in order to fix the dielectric body of the connector described in the prior art in the outer conductor terminal and prevent the connector from being pulled back and forth, a cut-and-raised portion for locking formed on the inner surface of the outer conductor terminal. The pieces 73c and 83c also had a problem. In particular, the locking cut-and-raised piece 83c on the lower side of the shield connector 80 shown in FIG. 8 disturbs impedance matching when the tip of the cut-and-raised piece approaches the inner conductor terminal 82 as shown in the drawing. Further, the opening 85 formed by cutting and raising also becomes a factor that disturbs impedance matching.
In other words, in order to make these shielded connectors compatible with the transmission of higher frequency electrical signals, it is necessary to eliminate such irregularities for locking the outer conductor terminals and the dielectric and to make the characteristic impedance of the connector uniform. I needed to.

The problem to be solved by the present invention is to improve the impedance matching of the connector to reduce the noise radiation amount, the reflection loss of the signal, and the like, and also to provide a shielded connector which is easily assembled to the cable end. Is to provide.

[0018]

In order to solve this problem, a shield connector according to a first aspect of the present invention is a shield in which a signal conductor and a shield conductor are integrally covered with a sheath via an insulator. A shield connector in which an inner conductor terminal is connected to the signal conductor of the cable, the inner conductor terminal is accommodated in a substantially cylindrical outer conductor terminal via a dielectric, and the shield conductor is connected to the outer conductor terminal. In the above, an opening is formed on one side of the outer conductor terminal to accommodate the inner conductor terminal, and the connection portion between the signal conductor of the shielded cable and the inner conductor terminal is exposed and accommodated in the opening. In addition, a convex wall is formed on the inner bottom surface of the opening so as to bulge toward the connection side of the inner diameter of the opening with the inner conductor terminal of the signal conductor of the shield cable exposed and accommodated in the opening. The It is intended to be subject matter of.

In the shielded connector having the above structure, the outer diameter of the connecting portion between the signal conductor of the shielded cable and the inner conductor terminal connected thereto is not increased in accordance with the inner diameter of the outer conductor terminal, but the portion Impedance matching is achieved by reducing the inner diameter of the outer conductor terminal to match the outer diameter of the connection part of the signal conductor with the inner conductor terminal. The opening is formed so that the connection between the signal conductor of the shielded cable and the inner conductor terminal is exposed, and at that time the opening is reduced in diameter by the convex wall formed on the inner bottom surface. 8, the inner conductor terminal after being connected to the signal conductor of the shielded cable can be attached to the dielectric body previously housed inside the outer conductor terminal by utilizing the opening of the outer conductor terminal. In addition to being able to do the same, the formed convex wall reduces the diameter of the opening of the outer conductor terminal, so that the vicinity of the connection part between the signal conductor and the inner conductor terminal of the shielded cable that has been opened to the air High characteristic impedance can be lowered to match the impedance.

By providing the convex wall in this manner, the impedance of this portion in the connector can be set to match with the other portion, and the mismatch can be eliminated. That is, the reflection and radiation of the signal in the opening are reduced, and it can be applied to the transmission of a higher frequency electric signal. Also, regarding the workability when connecting to the shielded cable end, it requires a separate process such as the diameter expansion of the conventionally used crimping part of the metal tape by hand or the crimping of the metal sleeve. Instead, it is a simple and accurate structure because it uses only the outer conductor terminal having the convex wall.

In this case, as described in claim 2, between the connecting portion of the signal conductor of the shielded cable with the inner conductor terminal and the convex wall formed on the inner bottom surface of the opening of the outer conductor terminal. If a part of the dielectric material to which the inner conductor terminal is mounted is interposed, it becomes easier to set the characteristic impedance of the opening part to match the other part, and the signal impedance in the opening part It can reduce reflections and radiation.

Further, as described in claim 3, the dielectric body interposed between the inner conductor terminal and the outer conductor terminal and the convex wall formed on the inner bottom surface of the opening of the outer conductor terminal are engaged. If the dielectric body is fixed to the outer conductor terminal by being combined with the outer conductor terminal, the cut-and-raised piece for locking 73 as in the prior art is used.
Since the dielectric can be housed and fixed in the outer conductor terminal without providing b, 83b, etc., it is possible to reduce factors that disturb impedance matching. Therefore, the unevenness for locking the outer conductor terminal and the dielectric is eliminated, and the impedance of the connector can be made uniform. As a structure for engaging the dielectric and the convex wall, as described in claim 4, the engaging portion of the dielectric with the convex wall and / or the convex wall is elastically formed, and these members are formed. 6. A structure in which the dielectric and the convex wall engage with each other by elastically deforming, or
As described in (1), the dielectric and the convex wall may be engaged with each other by press-fitting and fixing the convex wall in the insertion hole formed in the engaging portion with the convex wall of the dielectric.

According to a sixth aspect of the present invention, in the structure in which the dielectric body is fixed in the outer conductor terminal by engaging the dielectric body and the convex wall, the substantially cylindrical portion of the outer conductor terminal is further provided. If both the side wall surface and the outer surface of the dielectric located inside the side wall are formed to be substantially flat, the dielectric locking formed on each of the outer conductor terminal and the dielectric as in the prior art. Since there is no unevenness due to, the impedance of the connector becomes more uniform.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION A shield connector according to an embodiment of the present invention will be described in detail below with reference to the drawings. 1 is an exploded perspective view of the shield connector 10, FIG.
3 is a perspective view showing the assembling of the dielectric to the outer conductor terminal, FIG.
(A) is a longitudinal sectional view of the shielded connector after assembly, (b)
Shows its cross-sectional view.

The shield connector 10 shown in FIG. 1 includes a dielectric 12 in which the inner conductor terminal 11 is housed, and the dielectric 12.
And an outer conductor terminal 13 that accommodates. A high frequency signal is transmitted to the inner conductor terminal 11,
The outer conductor terminal 13 is for covering the periphery of the inner conductor terminal 11 and electromagnetically shielding it.

The inner conductor terminal 11 is formed by bending a conductive plate material and is formed into a tapered shape. The inner conductor terminal 11 is connected to the inner conductor terminal of a mating connector (not shown) to transfer an electric signal. The inner conductor terminal 11 in this case has a so-called male terminal shape, and is formed with tab-shaped tab portions 11a extending forward from the upright portions 11b, 11b that are upright from the left and right of the center, The tab portion 11a is electrically connected by mating and contacting with the inner conductor terminal of the other party.

In addition, the upright portions 11b, 1 of the inner conductor terminal 11
A crimping portion 11c is extended rearward from 1b. The crimping portion 11c is provided with crimping pieces 11d, 11d which are crimped and connected to the signal conductor Wa of the shielded cable W,
The inner conductor terminal 11 and the signal conductor Wa are electrically connected by crimping and fixing the signal conductor Wa by the crimping piece 11d.

Dielectric 1 into which this inner conductor terminal 11 is inserted
2 is formed of an insulating material made of resin having a predetermined relative permittivity, and is assembled between the inner conductor terminal 11 and the outer conductor terminal 13 so as to insulate both conductor terminals. It is a thing.

An insertion hole 12a into which the inner conductor terminal 11 is inserted is formed in the body 12b so as to be opened in the front and rear. In addition, the lower half of the main body portion 12b extends rearward, and the inserted inner conductor terminal 1
Crimping portion accommodating portion 14 that covers the left and right downward direction of the first crimping portion 11c.
Has become. The inner conductor terminal 11 is pressed into the insertion hole 12a from the rear of the dielectric 12 and fixed by press fitting. At that time, the crimp portion 11c of the fixed inner conductor terminal 11 is positioned in the crimp portion accommodating portion 14 of the dielectric 12,
The lower left and right sides of the crimp portion 11c are covered by the crimp portion accommodating portion 14.

In this case, the bottom portion 14a of the crimp portion accommodating portion 14 is elastically deformable in the up and down direction separately from the left and right side portions 14b and 14b. A locking claw 14c that protrudes downward is formed at the rear end of the bottom portion 14a, and when housed in the outer conductor terminal 13 described later, the rear end of the convex wall 15 provided on the inner bottom surface of the opening 13b. Is adapted to engage with. Therefore, the crimp portion accommodating portion 14 of the dielectric 12 is exposed at the position of the opening 13b of the outer conductor terminal 13.

The outer conductor terminal 13 is formed by bending a conductive plate material into a hollow shape that is open in the front-rear direction, and fixes the shielded cable W and the cylindrical main body portion 13a having upper, lower, left and right walls. A cable crimping portion 13c connected to the shield conductor Wd.

The above-mentioned dielectric 12 can be housed in the housing chamber 13d inside the main body 13a. When the outer conductor terminal of a mating connector (not shown) is fitted into the left and right walls in front of the main body 13a, elastic contact pieces 13e that elastically contact the outer wall surface of the outer conductor terminal are curved inward. Has been formed. Similarly, the upper and lower walls are provided with contact protrusions 13f that are in contact with the outer wall surfaces of the outer conductor terminals on the other side and project inward.

On the rear side of the main body portion 13a, an opening portion 13b having an open upper wall is formed. The opening portion 13b is inserted into the insertion hole 12a of the dielectric body 12 that is housed and fixed in the outer conductor terminal 13 in advance, and the rising portions 11b and 11b of the inner conductor terminal 11 already crimped and connected to the signal conductor 20a of the shielded cable W.
Is opened for use as a space for being hooked by a jig or the like (not shown) and pushed in from the rear. Crimping portion 11 of inner conductor terminal 11 after being inserted into dielectric 12
c is exposed at the position of the opening 13b.

A convex wall 15 is formed on the lower wall of the outer conductor terminal 13 at the position of the opening 13b so as to project inward by shearing. This convex wall 15 is shown in FIG.
As shown in FIG. 3A, it is located below the crimping portion 11c of the inner conductor terminal 11 after being inserted into the dielectric 12, and is indicated by C in FIG.
As shown in the -C cross section, the diameter of the inner wall cross section of the outer conductor terminal 13 is reduced by projecting only this portion inward.

The convex wall 15 is also used for fixing the dielectric 12 in the outer conductor terminal 13 by engaging with the dielectric 12. As shown in FIG. 2, the bottom portion 14a of the dielectric 12 is
When the locking claw 14c formed on the upper end of the vehicle overlies the convex wall 15 and engages with the rear end portion thereof, the dielectric body 12 is fixed in the outer conductor terminal 13 in a non-removable manner.

A pair of crimping pieces 13g and 13g for crimping and fixing the shielded cable W placed thereon are formed on the cable crimping portion 13c extending so as to be narrowed from the rear of the main body 13a of the outer conductor terminal 13. Has been done. In this case, the outer conductor terminal 13 and the shield conductor Wd are electrically connected by crimping and fixing the inverted portion Wf, which is obtained by inverting the shield conductor Wd of the shielded cable W, on the sheath We, which is the jacket.

Further, guide pieces 13h projecting outward are formed from the upper ends of the left and right walls at the positions of the openings 13b of the outer conductor terminals 13, and are housed in a connector housing (not shown) for housing and fixing the outer conductor terminals 13. In doing so, it is guided in the guide groove formed in the connector housing.

Next, the function and effect of the convex wall 15 in the shield connector 10 having such a configuration will be described with reference to FIG.
Will be explained. FIG. 3A shows a vertical cross section of the shielded connector of FIG. 2, and FIG. 3B shows its AA cross section. As shown in the figure, the crimping portion 11c of the inner conductor terminal 11 is usually a signal conductor Wa of the shielded cable W.
Since the size and shape are prioritized for connection reliability with, the diameter after crimping is generally smaller than that of the standing portion 11b, but the crimping portion 11c of the inner conductor terminal 11 after crimping is formed.
In addition to covering the three directions around the opening 13b with the left and right downward wall surfaces of the opening 13b, the convex wall 15 is provided on the lower wall of the opening 13b so as to project toward the crimp portion 11c.
By partially denting the inner diameter of 3b, the diameter is reduced.

That is, impedance matching is achieved by reducing the diameter of the outer conductor terminal of the opening 13b in accordance with the crimping portion 11c. In the air without being covered with the outer conductor terminal and the dielectric as in the prior art. It becomes possible to change the high impedance near the inner conductor terminal crimping portion 11c to a lower setting due to the fact that it has been opened to the inside, and the convex wall 15 of the convex wall 15 is arranged so as to match the impedance of this portion in the connector with other portions. The misalignment can be resolved by setting the amount of protrusion and the shape.

Therefore, in the structure of the prior art, since the impedance is not matched, a large amount of noise is radiated from the part not covered by the outer conductor terminal, but in this structure, the impedance mismatch of the corresponding part is eliminated. Therefore, it can be applied to electrical signal transmission at higher frequencies, and connectors with excellent characteristics that prevent problems such as crosstalk at that time, reduction in transmission efficiency, and noise due to signal reflection are prevented. Can be

Also, unlike the conventional technique of manually increasing the diameter of the crimped portion of the inner conductor terminal after crimping the inner conductor terminal or the process of separately crimping the metal sleeve to increase the diameter, as in the prior art. Instead of increasing the diameter of the crimped part of the inner conductor terminal after crimping, the inner diameter of the opening of the outer conductor terminal
Since only the outer conductor terminal 13 having the convex wall whose diameter is reduced so as to be matched is used, the manufacturing cost of the connector having extremely excellent high frequency characteristics can be made equal to that of the conventional one.

Further, unlike the prior art, between the crimping portion which is the connection portion of the signal conductor of the shielded cable with the inner conductor terminal and the convex wall formed on the inner bottom surface of the opening of the outer conductor terminal. Also, since a part of the dielectric material is interposed, design parameters for matching the characteristic impedance of the opening portion together with the convex wall with other portions increase, and setting for matching is easy. In addition, since the convex wall is formed by shearing a part of the inner wall of the opening, a new impedance-disturbing impedance such as the opening when the cut-and-raised piece for locking the dielectric described in the prior art is provided. The convex wall can be formed on the inner wall of the opening of the outer conductor terminal without the need for such a large opening.

By adopting the structure in which the dielectric is engaged with the convex wall and fixed in the outer conductor terminal, a cut-and-raised piece dedicated to the dielectric locking as in the prior art is provided on the outer conductor terminal. Since the dielectric can be fixed in the outer conductor terminal without requiring, it is possible to reduce factors that disturb impedance matching. Therefore, since the unevenness for locking the outer conductor terminal and the dielectric as in the prior art is eliminated,
The characteristic impedance of the connector can be uniform.

Next, another embodiment of the present invention will be described with reference to FIGS. It should be noted that the three shielded connectors shown in FIGS. 4 to 6 differ from the shielded connectors of the above-described embodiment only in the structure for engaging the dielectric and the convex wall, and thus the same configurations as those of the above-described embodiment Are denoted by the same reference numerals and the description thereof will be omitted, and different points will be mainly described.

Shield connector 4 shown in FIG. 4 (a)
The 0 convex wall 41 is cut and raised from the lower wall of the opening 13b by shearing, and its rear end side can be elastically deformed vertically. When the dielectric 12 is accommodated from the front of the outer conductor terminal 13, the bottom portion 42a of the crimp portion accommodating portion 42 of the dielectric 12 is received.
The downward engaging claw 42b formed on the lower side of the
By overcoming and engaging with the rear end of the convex wall 41, the dielectric 12 is fixed in the outer conductor terminal 13 irremovably (see FIG. 4B).

Shield connector 5 shown in FIG. 5 (a)
The 0 convex wall 51 is cut and raised from the lower wall of the opening 13b by shearing, and in this case, the front end side is vertically elastically deformable. When the dielectric body 12 is housed from the front of the outer conductor terminal 13, the convex wall 51 is press-fitted into the press-fitting hole 52b formed in the bottom plate 52a of the crimping portion housing portion 52 of the dielectric body 12, so that the dielectric body 12 becomes an outer conductor. It is fixed in the terminal 13 so that it cannot be pulled out (see FIG. 5B).

Shield connector 6 shown in FIG. 6 (a)
Similarly, the 0 convex wall 61 is also cut and raised from the lower wall of the opening 13b by shearing, and the front end side can be elastically deformed vertically. Bottom part 62 of crimping part accommodating part 62 of dielectric 12
a On the lower back side, an engaging piece 62c having a locking claw 62b whose tip is elastically deformable vertically is provided, and on both left and right sides of this engaging piece 62c (only one side is shown) An abutment portion 62d that abuts on the front end of the wall 61 and restricts the rearward movement of the dielectric 12 is provided. Therefore, when the dielectric 12 is accommodated from the front of the outer conductor terminal 13, the downward engaging claw 62b engages with the front end portion of the shear opening surface 61a of the convex wall 61, and the stopper portion 62d causes the front end of the convex wall 61 to move. The dielectric 12 is fixed in the outer conductor terminal 13 by being abutted against the outer conductor terminal 13 (see FIG. 6B).

The steps of terminal processing for connecting the shielded connector to the shielded cable described above include i) exposing the signal conductor and the shield conductor by peeling off the shielded cable end (inverting the shield conductor on the sheath if necessary). ), Ii) crimping the inner conductor terminal to the signal conductor, iii) inserting the inner conductor terminal into a dielectric previously housed in the outer conductor terminal, and iv) crimping the outer conductor terminal to the shield conductor. . These steps are the same as those conventionally performed, and by using the outer conductor terminal according to the present invention, the steps for processing the connection terminal to the shielded cable can be made the same as the conventional method, and the terminal processing is actually performed. factory·
There is no need to introduce a new processing machine for each line, and the cost is extremely low compared to conventional products with equivalent performance.

Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and it goes without saying that the present invention can be implemented in various modes without departing from the scope of the present invention. For example, although the convex wall is provided in a flat plate shape in the above-described embodiment, it may be formed in a curved shape, for example, and it may be set so as to eliminate impedance mismatch, and various shapes may be used. it can. The point is that the inner diameter of the opening of the outer conductor terminal is
The convex wall is not limited to the above-mentioned embodiment as long as it is a convex wall whose diameter is reduced toward the connecting portion between the signal conductor exposed in the opening and the inner conductor terminal to achieve impedance matching. Further, although the male type connector is shown in the embodiment, it is also applicable to a female type connector. Further, it is needless to say that the present invention can be applied not only to the connection between the cable connectors but also to a connector for a board which is connected and fixed to a printed board or the like.

[0050]

According to the present invention, the inner conductor terminal connected to the signal conductor of the shielded cable is previously housed inside the outer conductor terminal by utilizing the space (opening) in which the upper surface of the outer conductor terminal is opened. In a shielded connector with a structure in which the connection part between the signal conductor and the inner conductor terminal is exposed in the opening when mounted on the dielectric, the inner bottom surface of the opening is closer to the connection part where the inner diameter of the opening is exposed. The inner conductor terminal was previously opened to the outside from the opening of the outer conductor terminal by providing a convex wall to reduce the diameter and matching the characteristic impedance of the connector even near the connection part. The high impedance in the vicinity of the connection portion with the signal conductor can be lowered to eliminate the impedance mismatch, and in addition, it has the same workability as that of the conventional cable terminal and has high accuracy.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a shield connector according to a first embodiment of the present invention.

FIG. 2 is a diagram showing how the shield connector of FIG. 1 accommodates a dielectric.

3A is a vertical cross-sectional view of the shield connector of FIG. 1 after assembly, and FIG. 3B is a cross-sectional view taken along the line AA.

FIG. 4 (a) is a diagram showing a state in which a shield connector according to a second embodiment of the present invention accommodates a dielectric material, and FIG. 4 (b) is a diagram showing a vertical cross section of the shield connector after assembly. is there.

FIG. 5A is a diagram showing a state in which a shield connector according to a third embodiment of the present invention accommodates a dielectric, and FIG. 5B is a diagram showing a vertical cross section of the shield connector after assembly. is there.

FIG. 6A is a view showing a state of housing a dielectric of a shield connector according to a fourth embodiment of the present invention, and FIG. 6B is a view showing a vertical cross section of the shield connector after assembling. is there.

FIG. 7 is a view showing a vertical cross section and a horizontal cross section of a conventionally generally known shielded connector.

FIG. 8 is a view showing a vertical cross section and a horizontal cross section of another conventionally known shielded connector.

[Explanation of symbols]

10 Shield connector 11 Inner conductor terminal 11c Crimping part 12 Dielectric 12a insertion hole 13 Outer conductor terminal 13b Terminal insertion opening 14 Crimping section housing section 14a bottom 14c Locking claw 15 Convex wall W shielded cable Wa signal conductor Wb insulator Wc shield conductor Wd sheath

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Norifumi Yoshida             1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi             Auto Network Technical Laboratory Co., Ltd. F-term (reference) 5E021 FA03 FB11 FC21 FC23 LA09                       LA12 LA15 LA21

Claims (6)

[Claims] 1. An inner conductor terminal is connected to the signal conductor of a shielded cable in which a signal conductor and a shield conductor are integrally covered with a sheath via an insulator, and the inner conductor terminal is substantially interposed via a dielectric. In a shielded connector housed in a tubular outer conductor terminal and having the shield conductor connected to the outer conductor terminal, one side of the outer conductor terminal is
An opening is formed to accommodate the inner conductor terminal, the connection portion between the signal conductor of the shielded cable and the inner conductor terminal is exposed and accommodated in the opening, and the inner bottom surface of the opening is A shielded connector, wherein a convex wall is formed so that the inner diameter of the opening is exposed to the side of the connection portion of the signal conductor of the shielded cable exposed and accommodated in the opening with the inner conductor terminal. 2. The inner conductor terminal is also mounted between a connecting portion of the signal conductor of the shielded cable with the inner conductor terminal and a convex wall formed on the inner bottom surface of the opening of the outer conductor terminal. The shielded connector according to claim 1, wherein a part of the dielectric is interposed. 3. A dielectric body interposed between the inner conductor terminal and the outer conductor terminal, and a convex wall formed on an inner bottom surface of an opening of the outer conductor terminal are engaged with each other, thereby the dielectric body. 3. The shield connector according to claim 1, wherein the shield connector is fixed in the outer conductor terminal in a non-removable manner. 4. The engaging portion of the dielectric with the convex wall and / or the convex wall is elastically formed, and the dielectric and the convex wall are engaged by elastically deforming these members. The shield connector according to claim 3, wherein: 5. The dielectric and the convex wall engage with each other by press-fitting and fixing the convex wall in an insertion hole formed in an engaging portion of the dielectric with the convex wall. The shielded connector according to claim 3. 6. The side wall surface of the substantially tubular portion of the outer conductor terminal and the outer side surface of the dielectric member located inside thereof are both substantially flat. Shielded connector described in either