JP3712590B2 - Cable connector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cable connector used for connecting a shielded wire or a coaxial wire.
[0002]
[Prior art]
The prior art will be described taking a board connector used for a wiring board as an example.
[0003]
As shown in FIGS. 8 to 10, the board connector (shown here as a square connector having a square cross section) A has a dielectric 3 attached to the outer periphery of an inner conductor terminal (male terminal) 2 connected to the wiring board 1. In addition, the dielectric 3 is fitted into the outer conductor shell 4, and the male terminal 2 is connected to the inner conductor terminal (female terminal) 5 of the wire side connector B, and the outer conductor shell 4 is also connected to the outer conductor terminal 6 respectively. Plugged in and connected.
[0004]
9 and 10, 7 is a dielectric provided between the female terminal 5 and the outer conductor terminal 6 of the wire side connector B, 8 is an inner conductor of the cable C, 9 is an intermediate insulator, 10 is an outer conductor, Reference numeral 11 denotes an outer cover, and reference numeral 12 in FIG. 10 denotes a connector housing that covers the connecting portions of both connectors A and B.
[0005]
In this type of connector, there is no problem when the frequency of the transmission line used is relatively low, but when used in a high frequency band of several GHz or more, if the impedance of the connector itself does not match that of the transmission line, As shown in FIG. 11, VSWR (voltage standing wave ratio) increases due to signal reflection and the like, and transmission loss occurs. For this reason, it is necessary to adjust the impedance of the connector to achieve impedance matching with the transmission line.
[0006]
Here, when the same dielectric is used for the impedance of the connector A, the cross-sectional ratio X = D / d (d is the cross-section of the terminal 2) between the inner conductor terminal 2 and the outer conductor shell 4 shown in FIGS. The outer dimension, D, is determined by the inner dimension of the outer conductor shell 4 in the cross section. (To be precise, the impedance of the entire connector is obtained by the total impedance determined by the cross-sectional dimension ratio of each portion of the terminal 2 and the outer conductor shell 4.
[0007]
Therefore, for example, if you want to reduce the impedance to match the transmission path,
( i ) Increase d with D = constant
( ii ) Any method of decreasing D with d = constant can be used.
[0008]
[Problems to be solved by the invention]
As a means for carrying out the method ( i ) , the terminal 2 has a box structure as shown in FIG. 13 to increase the cross section, and as a means for carrying out the method ( ii ) , a dielectric as shown in FIG. While reducing the cross section of the body 3, it is conceivable to form the outer conductor shell 4 in the shape of a stepped cylinder having a small diameter portion 4a that matches the dielectric 3.
[0009]
However, by any means, the structure of the terminal 2 or the outer conductor shell 4 becomes complicated, and in particular, the means of FIG.
[0010]
For this reason, the connector A is conventionally designed in consideration of impedance matching in the frequency range to be used. However, when a connector corresponding to a higher frequency is required, a new one is redesigned. There was a need.
[0011]
The present invention is to provide terminal, a cable connctor capable of easily adjusting the impedance with the dielectric and the outer conductor of the common parts.
[0012]
[Means for Solving the Problems]
The invention according to claim 1, the dielectric is mounted on the outer periphery of the terminal, the cable connctor this dielectric is fitted into the outer conductor, for adjusting the impedance of the connector by changing the cross-section ratio of the terminal and the outer conductor The adapter is configured by attaching a heat-shrinkable tube to the outer periphery of the conductive metal foil, and heat-shrinks the tube with the adapter fitted on the outer periphery of the dielectric. Thus, the adapter is configured to be attached to the outer periphery of the dielectric, and the electrical connection means for electrically connecting the metal foil of the adapter and the outer conductor is provided .
[0013]
According to a second aspect of the present invention, in the configuration of the first aspect, the outer periphery of the dielectric is provided with a convex portion as a spacer that forms a gap that can accommodate the adapter with the outer conductor .
[0014]
According to a third aspect of the present invention, in the configuration of the first or second aspect, as an electrical connecting means, a clip having a spring property is mounted across the metal foil of the adapter and the outer conductor .
[0015]
According to a fourth aspect of the present invention, in the configuration of the first or second aspect , as the electrical connection means, the adapter is partially exposed on the outer peripheral side of the adapter to form a conductive portion while the adapter is inserted into the outer conductor. The contact piece which contacts the said electroconductive part is provided .
[0016]
As above SL, it is possible to adjust the impedance by attaching the adapter as needed between the dielectric and the outer conductor. For this reason, the impedance can be easily adjusted according to the frequency band.
[0017]
In this case , it is not necessary to change the structure of the terminal, the dielectric, and the outer conductor according to the impedance to be obtained by using the adapter type, and these are common parts.
[0018]
These points are particularly useful in a male connector (for example, a board connector exemplified in the section of the prior art) where impedance adjustment is highly necessary.
[0019]
In addition, the adapter can be firmly attached to the outer periphery of the dielectric as a substantially integral part.
[0020]
In this case , according to the configuration of the second aspect, the dielectric can be fitted into the outer conductor in an appropriate state by the convex portion even when the adapter is not attached, and there is no trouble in inserting another spacer component at this time. .
[0021]
In addition, since the modification of the dielectric structure is minimal with the addition of convex portions, these can be easily manufactured.
[0022]
Further, according to the configuration of claim 3 using a clip as electrical connection means, extra processing for electrical connection to the adapter side is unnecessary.
[0023]
On the other hand, according to the configuration of the fourth aspect , the adapter and the outer conductor can be automatically connected by the contact piece and the conductive portion, so that neither a separate part for connection nor a separate operation is required.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0025]
In the following embodiments, a board rectangular connector is used as an application object in accordance with the description of the prior art.
[0026]
1st Embodiment (refer FIGS. 1-3 )
21 is an inner conductor terminal (male terminal), 22 is a dielectric into which the terminal 21 is inserted, 23 is an outer conductor shell into which the dielectric 22 is fitted, and the connector D is basically constituted by these, and is used as a transmission line. In addition, the adapter 24 is added when it is desired to reduce the impedance.
[0027]
The adapter 24 is formed in a U-shaped plate shape as shown in the figure by a conductive material (metal plate or conductive resin), and is fitted into the outer periphery of the dielectric 22 from the outer peripheral side (upper side).
[0028]
As shown in FIG. 3A, the dielectric 22 has a cross-sectional shape so that when the adapter is fitted into the outer conductor shell 23 in an attached state, the outer peripheral surface of the adapter is substantially in close contact with the inner peripheral surface of the outer conductor shell 23. And the size is set.
[0029]
In other words, when the adapter 24 is not attached as shown in FIG. 3B, a gap (air layer) that can accommodate the adapter 24 between the outer peripheral surface of the dielectric 22 and the inner peripheral surface of the outer conductor shell 23. ) The cross-sectional shape and size of the dielectric 22 are set so that α is formed.
[0030]
In addition, a convex portion 22a that protrudes in a square shape over the entire circumference at one end portion in the length direction of the dielectric 22 and a convex portion 22b that partially protrudes toward the outer peripheral side at the four corners of the other end portion are integrated. 3, the protrusions 22 a and 22 b abut against the inner surface of the outer conductor shell 23 to perform a spacer function in a state in which the adapter is not attached as shown in FIG. Is configured to be held.
[0031]
Further, elastic contact portions 24 a having spring properties are provided on both opposite side walls of the adapter 24 so as to protrude outward in a curved shape, and the elastic contact portions 24 a elastically contact the inner surface of the outer conductor shell 23. By doing so, the adapter 24 and the outer conductor shell 23 are electrically connected.
[0032]
Also, projections 22c projecting outward are provided on two side surfaces of the dielectric 22, and the elastic contact portion 24a is engaged with the projection 22c in a state where the adapter 24 is mounted on the dielectric 22 as shown in FIG. Match. As a result, the adapter 24 is prevented from coming off by the dielectric 22 in each direction.
[0033]
This retaining means may be provided on another side surface, or may be changed to another retaining structure. Although not shown, normally, means for preventing the dielectric 22 from coming off from the outer conductor shell 23 (for example, a protrusion on the outer peripheral surface of the dielectric 22 and a protruding piece locked to the outer conductor shell 23) is provided. .
[0034]
In addition, when the adapter 24 and the outer conductor shell 23 are sufficiently electrically connected to the opposing peripheral surfaces, the elastic contact portion 24a is not necessarily provided.
[0035]
According to this connector D, the impedance is adjusted by attaching the adapter 24 to the outer periphery of the dielectric 22 (the gap α between the dielectric 22 and the outer conductor shell 23) as necessary as shown in FIG. can do.
[0036]
That is, with the adapter 24 attached, the cross-sectional ratio (X = D / d) between the outer conductor shell 4 (23) and the dielectric 3 (22) described in FIG. When the adapter is not attached, the cross-sectional ratio increases and the impedance increases.
[0037]
Therefore, when this connector D is used in a relatively low frequency band (especially when there is no need for impedance adjustment), the adapter 24 in FIG. If it is necessary to reduce the impedance, the adapter 24 may be attached.
[0038]
By adopting this adapter type configuration, each component of the terminal 21, the dielectric 22, and the outer conductor shell 23 can be handled as a common component through different frequency bands.
[0039]
In addition, since the modification of the structure is minimal, mainly by adding the convex portions 22a and 22b as spacers to the dielectric 22, these can be manufactured easily.
[0040]
Second and third embodiments (see FIGS. 4 to 7)
In the following embodiments, only differences from the first embodiment will be described.
[0041]
In both the second and third embodiments, a heat-shrinkable tube 26 is attached to the outer periphery of the conductive metal foil 25 to form an adapter 27, and the adapter 27 is heated while being fitted on the outer periphery of the dielectric 22. The entire adapter 27 is integrated with the dielectric 22 by heat shrinking.
[0042]
Here, as an electrical connection means for electrically connecting the metal foil 25 and the outer conductor shell 23, in the second embodiment shown in FIGS. 4 to 6, a conductive clip 28 having a spring property is connected to the inner surface of the metal foil 25. The outer conductor shell 23 is attached across the outer surface.
[0043]
In addition, in order to stabilize the electrical connection state between the clip 28 and the outer conductor shell 23, an engagement hole 29 into which the distal end portion of the clip 23 is fitted is provided in the outer conductor shell 23.
[0044]
On the other hand, in the third embodiment shown in FIG. 7, the conductive portion 25 a is formed by partially notching the tube 26 of the adapter 27 to expose the metal foil 25, and the elastic contact piece 30 provided on the outer conductor shell 23 is provided. The metal foil 25 and the outer conductor shell 23 are electrically connected by elastic contact with the conductive portion 25a.
[0045]
The elastic contact piece 30 may be formed by cutting and raising a part of the side wall of the outer conductor shell 23 in the shape of a leaf spring as shown, or may be formed by attaching a leaf spring material to the inner surface of the shell side wall. . Moreover, the contact piece 30 should just contact the electrically conductive part 25a automatically and reliably, and if it can fulfill | perform this function, it does not necessarily need to give elasticity.
[0046]
According to both the second and third embodiments, the adapter 27 can be firmly attached to the outer periphery of the dielectric as a substantially integral part.
[0047]
Other Embodiments (1) As a modification of the first embodiment, the adapter 24 may be fitted into the dielectric 22 from the side or the bottom instead of from above.
[0048]
Alternatively, the adapter 24 may be formed in a cylindrical shape instead of a U shape, and fitted into the dielectric 22 from the length direction. In this case, since it is necessary to omit at least one of the both side protrusions 22a and 22b as a spacer of the dielectric 22, it is necessary to add a spacer member instead of this when the adapter is not attached.
[0049]
(2) The adapter is not limited to the above-described fitting type, and may be configured such that a plurality of plate-like pieces are mounted on the outer periphery of the dielectric.
[0050]
(3) The present invention can be applied not only to the rectangular connector having a rectangular cross section described in the above embodiment, but also to a round connector having a circular cross section.
[0051]
(4) The present invention is particularly suitable for a male connector (substrate connector) having a high need for impedance adjustment, but is also applicable to a female connector (wire connector) C shown in FIGS. is there.
[0052]
【The invention's effect】
When according to the invention as described above, as above SL, it is possible to adjust the impedance by attaching the adapter as needed between the dielectric and the outer conductor. For this reason, the impedance can be easily adjusted according to the frequency band.
[0053]
In this case , it is not necessary to change the structure of the terminal, the dielectric, and the outer conductor according to the impedance to be obtained by using the adapter type, and these are common parts.
[0054]
In addition, the adapter can be firmly attached to the outer periphery of the dielectric as a substantially integral part.
[0055]
In this case , according to the second aspect of the present invention, the dielectric can be fitted into the outer conductor in an appropriate state by the convex portion even when the adapter is not mounted, and there is no trouble in inserting another spacer component at this time. .
[0056]
In addition, since the modification of the dielectric structure is minimal with the addition of convex portions, these can be easily manufactured.
[0057]
Further, according to the invention of claim 3 using a clip as electrical connection means, extra processing for electrical connection to the adapter side is unnecessary.
[0058]
On the other hand, according to the invention of claim 4 , since the adapter and the outer conductor can be automatically connected by the contact piece and the conductive portion, separate parts for connection and separate operations become unnecessary.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a connector according to a first embodiment of the present invention.
FIG. 2 is a sectional view of the connector in an assembled state.
3A is an enlarged cross-sectional view taken along line III-III in FIG. 2 in a state in which the adapter is attached to the connector, and FIG. 3B is a state in which the adapter is not attached.
FIG. 4 is an exploded perspective view of a terminal, a dielectric, and an adapter of a connector according to a second embodiment of the present invention.
5 is a perspective view of a state in which an adapter is attached to a dielectric from the state of FIG.
FIG. 6 is a perspective view of the connector in an assembled state.
FIG. 7 is a view corresponding to FIG. 5 of a connector according to a third embodiment of the present invention.
FIG. 8 is an exploded perspective view of a conventional board connector.
FIG. 9 is a cross-sectional view showing the assembled state of the connector together with the wire connector.
FIG. 10 is a sectional view showing a state in which both connectors are coupled.
FIG. 11 is a diagram showing a relationship between a frequency and a voltage standing wave ratio (VSWR) in the connector.
FIGS. 12A and 12B are diagrams for explaining the relationship between the cross-sectional ratio and the impedance in the connector, where FIG. 12A is a cross-sectional view showing a case where the cross-sectional ratio is small and FIG.
FIG. 13 is an exploded perspective view of a terminal having a box-shaped structure as means for adjusting impedance by changing a cross-sectional ratio.
FIG. 14 is an exploded perspective view when the outer conductor shell is formed into a stepped cylindrical shape as another means.
[Explanation of symbols]
21 Terminal 22 Dielectric 22a, 22b Protrusion as spacer 23 Outer conductor shell (outer conductor)
DESCRIPTION OF SYMBOLS 24 Adapter 24a Elastic contact part 25 Metal foil 26 Heat-shrinkable tube 27 Adapter 28 Clip as electrical connection means 25a Conductive part as electrical connection means 30 Same elastic contact piece

Claims (4)

Dielectric is mounted on the outer periphery of the terminal, the cable connctor that the dielectric is inserted into the outer conductor, the adapter having conductivity for adjusting the impedance of the connector by changing the cross-section ratio of the terminal and the outer conductor The adapter is configured by attaching a heat-shrinkable tube to the outer periphery of the conductive metal foil, and the adapter is made of a dielectric material by thermally shrinking the tube with the adapter fitted on the outer periphery of the dielectric. configured for attachment to the outer periphery, and the cable connctor, characterized in that it comprises electrical connection means for electrically connecting the metal foil and the outer conductor of the adapter. The cable connector according to claim 1 , wherein a convex portion as a spacer is provided on the outer periphery of the dielectric so as to form a gap that can accommodate the adapter between the outer conductor and the outer conductor . The cable connector according to claim 1 or 2, wherein a clip having spring property is mounted as an electrical connection means across the metal foil and the outer conductor of the adapter . As an electrical connection means, the adapter is formed by exposing a part of the metal foil to the outer peripheral side of the adapter to form a conductive part, while the outer conductor is provided with a contact piece that comes into contact with the conductive part when the adapter is inserted. The cable connector according to claim 1 or 2 .

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