JPS63155573A - Earth connector for plug-in coaxial connector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a plug-in type coaxial connector, and in particular, connects the ground of the coaxial connector and an arm of a device body with low impedance to prevent noise. The present invention relates to a ground connection method for a plug-in coaxial connector suitable for reducing characteristic deterioration of the device.

[Conventional technology]

Plug-in type coaxial connectors have been developed in recent years, and their specific configuration was introduced, for example, in the 1985 IEICE Communications Division National Conference 54-2R Plug-in Optical Connectors.

Although the plug-in optical connector was introduced above, the plug-in coaxial connector has the same configuration except for the difference in the plug-in jack.

As shown in FIG. 5, the aforementioned plug-in optical connector is connected to a back wiring board (Back Wiring B) which forms a part of the device body.

ard) (hereinafter referred to as BWB) 1 is formed from a BW B side connector 2 arranged coaxially on both sides of 1, and an electronic circuit package (hereinafter referred to as PKG) 5 side connector 3, and the BWB side connector 2 is A resin housing 201 is fastened to one side of the BWB 1 by a screw 4 with a gap, and two angular shaped pieces are loosely fitted and supported in parallel with each other at a distance from each other. The PKG side connector 3 is formed from a plug 202, and the PKG side connector 3 includes an outer resin housing 30 having a U-shaped cross section and having an open end that is fastened to the other side of the BWBI with the screw 4.
1, an inner resin housing 303 mounted on the printed circuit board 501 forming the PKG 5, and having one end (BWBl side) outer circumferential portion 302 loosely fitted and supported within the outer resin housing 301, and this inner resin housing 303, and one end (BWB1 side) is inserted into the other end of the two plugs 202.

In addition, the two plugs 202 and the two jacks 30
4 is a center conductor installed at the center (not shown)
constitutes a signal line, and an external conductor (not shown) installed on each outer surface constitutes a ground.

[Problem that the invention seeks to solve]

In the prior art, the two plugs 202 and the two jacks 304 each have an insulating resin housing 20.
1.301, supported by BWB 1 via 303 and 2
Since the external conductors of the two plugs 202 and the two jacks 304 and the BWB 1 are not directly connected to ground,
Depending on the device, there is a problem in that the impedance of the ground becomes so large that the ground cannot sufficiently absorb noise generated in the PKG 5 and other parts, resulting in deterioration of the characteristics of the device.

In order to solve this problem, it is necessary to connect the external conductors of the BWB side connector 2 and the PKG connector 3 to the BWB1 directly to ground.

As a proposal, a resin housing 201 that supports two plugs 202 and two jacks 304, respectively.
, 3 (11, 302) may be made of conductive material, thereby grounding the external conductors of the two plugs 202 and the two jacks 305 and the BWB 1.

Therefore, as mentioned above, the resin housing 201°301
．． According to the results of experiments with conductive connectors 302, it was found that the ground between the two connectors 2 and 3 and the BWBI must be connected to an extremely low impedance.

For that purpose, the resin housings 201 and 30i are required.

302 must be formed of a metal with excellent conductivity.

However, when the housing is made of a highly conductive metal, new problems arise, such as an increase in the weight of the housing and a rise in price.

In addition, the two plugs 202 and the two jacks 3
04 and the housing, the contact position and contact force may change each time the two plugs 202 and the two jacks 304 are loosely fitted into the housing, and although the contact is stable, Therefore, the method of grounding the two plugs 202 and the two jacks 304 and the BWBI through the housing is impractical.

Another method may be to connect the two plugs 202 and the two jacks 304 to the BWBI with a conductive wire.

However, with this method, when the two plugs 202 and the two jacks 304 are taken out of the housing due to a failure or other reason, the work of taking out the conductor wires is added each time, so the number of connectors 2.3 is reduced. If there are many conductors, the number of conducting wires will naturally increase, and the back side of the BWB 1 will become cluttered, making maintenance work on the back side of the BWB 1 difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a ground connection device for a plug-in coaxial connector that solves the problems of the prior art described above, improves the noise resistance of the device, and reduces characteristic deterioration due to noise.

[Means for solving problems]

The above purpose is to connect a connector consisting of a plug and a jack, and an insulating housing that loosely fits and supports these plugs and jacks, into a plug that is coaxially supported on both sides of a BWB that forms part of the connector housing. In the coaxial connector, a conductive pattern is provided on the connector side surface of the BWB that supports the plug, and a conductive pattern is provided to connect the BWB to earth, and a hole in the conductive pattern into which the plug is movably and loosely fitted is provided. This is achieved by providing a conductive contact piece on the wall surface that connects the plug to earth using elastic force.

[Effect]

The present invention interposes a conductive pattern formed by superposing a conductive metal fitting made of a plate-shaped copper alloy for springs and a conductive ground pattern between a BWB and a connector into which a plug is loosely fitted. When the connector that loosely fits and supports the plug on both sides of the BWB and the connector that loosely fits and supports the jack 7 are tightened with screws, the conductive pattern and the BWB are grounded, and at the same time the plug is connected to the When the conductive metal fitting is loosely fitted in a movable direction, the tip of the conductive contact piece fixed to the wall of the hole connects to the plug with elastic force, so it is not affected by the shape of the plug. The plug and the BWB can be grounded without restricting the movement of the plug and the inner housing on the jack side.

〔Example〕

1 to 4 showing embodiments of the present invention will be described below. FIG. 1 is a sectional view showing a plug-in coaxial connector according to an embodiment of the present invention, FIG. 2 is a perspective view showing the conductive pattern shown in FIG. 1, and FIG. 3 is an enlarged sectional view of section A in FIG. 1. , FIG. 4 is a comparison diagram of characteristics due to noise between the present invention and the conventional method.

In the present invention, the parts other than the conductive pattern are the same as the conventional ones, so the parts other than the conductive pattern are indicated by the same symbols as in FIG. 5.

As shown in FIGS. 1 to 3, the conductive pattern 6 is formed from a conductive metal fitting 61 and a conductive earth pattern 62 which are superposed, and the conductive metal fitting 61 is made of a spring copper alloy and has a thickness T. is formed into a plate shape of about 0.1 to 0.2 mm,
There are two square holes 611 near the center into which the two plugs 202 are loosely fitted so as to be movable in the axial direction, and each square hole 611 has two square holes 611 at opposing ends so that the tips open and close with elastic holes. It has two fixed contact pieces 612, and has two circular holes 613 at both ends into which the screws 4 are movably loosely fitted, and the conductive earth pattern 62 is in contact with the BWB 1. It is designed to connect to ground when

Since the plug-in coaxial connector according to the present invention is constructed as described above, the plug, jack and BWB
This section describes how to connect to the ground.

First, the resin housing 201 that loosely fits and supports the two plugs 202 is brought into contact with one side of the BWB 1 via the conductive pattern 6, and the resin housing 301 is brought into contact with the other side of the BWB 1 and screwed. 4, the resin housing 201, the conductive pattern 6, and the resin housing 301 are fastened and supported by the BWB 1.

In this case, if the screw 4 is formed with a diameter of 3 mm and the screw 4 is tightened with a torque of 5 kg, the tightening force will be as large as 17 kg. It can be connected mechanically and stably.

When the two plugs 202 are loosely fitted into the square holes 611 at the same time, the contact pieces 612 in each of the square holes 611 press the outer surface of the plugs 202 with elastic force and open, so that the conductive metal fittings 61 and the plugs are released. 202 is connected to ground.

Therefore, when the plug 202 and jack 305 are loosely fitted,
Also, even if there is some error in the position of the plug 202 when the inner resin housing 303 is loosely fitted into the outer resin housing 301, or even if there is some error in the outer diameter dimension of the plug 202, these will be absorbed. The plug 202 and the contact piece 612 come into contact and connect the external conductor of the plug 202 to B via the conductive metal fitting 61 and the conductive ground pattern 62.
Can be grounded to WBI.

In addition, since the tip of the contact piece 612 can be freely moved outward so that it can always be restored inward, the movement of the plug 202 and the outer resin housing 301 and the movement of the plug 202
There is no restriction on attachment and detachment of the resin housing 201.

Furthermore, by forming the conductive metal fitting 61 with gold plating on the surface of a spring copper alloy, the external W body of the plug 202 and the B
WB l can be connected to ground.

In other words, as shown in Figure 5, when comparing the characteristic deterioration due to noise between the conventional method and the present invention, where the horizontal axis represents the frequency and the vertical axis represents the noise level, it is found that a part of the conventional flat characteristic becomes convex due to external noise. This causes deterioration of the characteristics of the device, but it is clear that this is reduced in the present invention.

〔Effect of the invention〕

According to the present invention, since the external conductor of the plug and the BWB can be grounded with low impedance, deterioration of characteristics due to grounding of the device can be reduced.

In addition, the external conductor of the plug and the BWB can be grounded without any restrictions on the shape or size of the plug (and the movement of the plug and resin housing, or the installation and removal of the plug), improving operability. can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a plug-in coaxial connector according to an embodiment of the present invention, FIG. 2 is a perspective view showing the conductive pattern shown in FIG. 1, and FIG. 3 is an enlarged sectional view of section A in FIG. 1. , FIG. 4 is a comparison diagram of characteristics due to noise between the present invention and a conventional one, and FIG. 5 is a sectional view showing a conventional plug-in coaxial connector. ■... Back wiring board (BWB), 2.
...BWB side connector, 3...Electronic circuit package (
PKG) side connector, 4...screw, 5...PKG,
6...4 conductive pattern, 61...conductive metal fitting, 62
...Conductive earth pattern, 612...Contact piece. Agent Patent Attorney Tadashi Akimoto Minoru 1 --- Ha'-774? Rin' Bar 7ri (BWB1
+5・--'4tP1 High 9-72-・B
WB [□1 Corita 6l-IJ
Den, a- 3----, child step buff cage (PKGI
Iij Co-play Kuta 62-ri Monument l1ti Earthha Turf 4・-m-screw 612・
-Dedicated A sentence piece 5 -PKG Figure 4 Shu Jl (MHz)

Claims (1)

[Claims] 1. A plug-in coaxial connector that is coaxially supported on both sides of a back wiring board that forms part of the connector housing, which is a connector consisting of a plug and a jack and an insulating housing that loosely fits and supports these plugs and jacks, respectively. A conductive pattern is provided on the connector side surface of the backboard that supports the plug, and a conductive pattern is provided to connect the backboard to earth, and an elastic force is used on the wall surface of the hole of the conductive pattern into which the plug is loosely fitted. A grounding connection device for a plug-in coaxial connector, characterized in that a conductive contact piece is provided for grounding the plug.