JP6025511B2 - Coaxial connector and board connection structure thereof - Google Patents

Description

  The present invention relates to a coaxial connector that is connected to a printed wiring board with a simple structure while maintaining impedance matching, and a substrate connection structure thereof.

  When connecting a coaxial transmission line such as a coaxial cable and a signal wiring pattern provided on a printed wiring board in the horizontal direction, for example, a conventional coaxial connector as disclosed in Patent Document 1 (FIG. 2). Is composed of a coaxial structure portion and a substrate connection portion, and the coaxial structure portion is constituted by a central conductor, an outer conductor having a cylindrical shape surrounding the central conductor, and an insulator filling between the central conductor and the outer conductor.

  On the other hand, the board connection part is composed of a signal terminal with the central conductor of the coaxial structure part extended, and a GND terminal used for fixing to the printed wiring board and connection of the return current path, and is formed on the surface layer of the printed wiring board. Soldering the signal wiring pattern and the signal terminal of the coaxial connector together, and soldering the GND pattern formed on the surface layer or the back surface layer of the printed wiring board and the GND terminal of the coaxial connector, the surface layer or the back surface layer When the GND pattern is not directly connected to the GND layer serving as a return path of the signal wiring, a structure in which the GND layer is connected to the GND layer of the front surface layer, the back surface layer, or the inner layer using a GND via or the like is common. .

However, if the return path of the signal wiring pattern formed on the surface layer of the printed wiring board cannot be directly connected to the GND terminal of the coaxial connector at the inner GND layer, the parasitic capacitance is caused by the GND pattern formed on the same surface layer as the signal pattern. In some cases, impedance mismatch may occur due to the occurrence of an inductance component or an increase in an inductance component due to a GND via for connection to the inner GND layer.
On the other hand, for example, Patent Document 2 proposes a structure in which a GND conductor plate is provided in which a flange that contacts a printed wiring board end face of a coaxial connector is provided with a sharp protrusion toward the end face of the printed wiring board.

JP 2007-165944 A JP 2011-65886 A

As described above, in the conventional coaxial connector disclosed in Patent Document 1, the reference of the signal wiring pattern formed on the surface layer of the printed wiring board cannot be directly connected to the GND terminal of the coaxial connector in the inner layer GND. There is a problem that impedance mismatch may occur due to a parasitic capacitance caused by the GND pattern formed on the same surface layer as the signal pattern or an increase in the inductance component due to the GND via for connection to the GND pattern of the inner layer. was there.
The coaxial connector disclosed in Patent Document 2 is one method for solving such a problem. However, the GND conductor board provided with a protrusion sharpened toward the end face of the printed wiring board or the end face of the printed wiring board. There has been a problem that the structure of the coaxial connector is complicated, such as the need for a screwing structure for biting into the connector.

  The present invention has been made in order to solve the above-described problems. With a simple connection structure, the impedance of the outer conductor of the coaxial structure portion of the coaxial connector and the GND layer of the inner layer of the printed wiring board is maintained. The purpose is to connect securely.

A coaxial connector according to the present invention is a conductor integrated with an outer conductor of the coaxial connector in a coaxial connector for horizontally connecting a coaxial transmission line such as a coaxial cable to a printed wiring board, and the coaxial connector is connected to the coaxial connector. A flange provided so as to be in contact with an end face of the printed wiring board, and a connecting member for electrically connecting the GND pad provided on the end face of the printed wiring board and the flange is inserted into the flange. A notch portion is provided for this purpose .

  According to the coaxial connector and the board connection structure of the present invention, the coaxial connector and the printed wiring board can be more reliably connected with a simple connection structure. Further, unnecessary increase in impedance can be prevented, and the coaxial connector and the printed wiring board can be connected while maintaining impedance matching.

It is a block diagram which shows the structure of the coaxial connector which concerns on Embodiment 1 of this invention. 1 is a structural diagram of a printed wiring board that connects coaxial connectors according to Embodiment 1 of the present invention. FIG. It is a perspective view from the upper surface and lower surface of the state which connected the coaxial connector and printed wiring board which concern on Embodiment 1 of this invention. It is sectional drawing of the state which connected the coaxial connector and printed wiring board which concern on Embodiment 1 of this invention. It is a block diagram which shows the structure of the coaxial connector which concerns on Embodiment 2 of this invention. It is a figure which shows the example which packed the conductor piece in the connection of a coaxial connector and a printed wiring board. It is a block diagram which shows the structure of the coaxial connector which concerns on Embodiment 3 of this invention. It is a block diagram which shows the structure of the coaxial connector which concerns on Embodiment 4 of this invention. It is a block diagram which shows the structure of the coaxial connector which concerns on Embodiment 5 of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
1 is a block diagram showing the structure of a coaxial connector according to Embodiment 1 of the present invention.
In FIG. 1, the coaxial connector 8 includes a coaxial portion 1, a flange 2, a signal terminal 3, an upper surface fixing plate 4 a, a back surface fixing plate 4 b, and a notch portion 5.
The coaxial part 1 is for connecting a coaxial transmission line such as a coaxial cable, and has a convex pin or concave socket-shaped central conductor and a cylindrical outer conductor corresponding to the coaxial transmission line to be connected. The outer conductor is filled with an insulator. Although not shown, the outer surface of the coaxial part 1 is often threaded so that it can be screwed.
The flange 2 is a conductor integrated with the outer conductor of the coaxial portion 1 of the coaxial connector 8 and is provided so as to contact the end face of the printed wiring board to which the coaxial connector is connected.
Inside the flange 2, a cylindrical hole continuing from the coaxial portion 1 and a central conductor, and an insulator filling the gap between them are contained.
The signal terminal 3 is a signal for connecting a central conductor of the coaxial portion 1 of the coaxial connector 8 and a signal wiring pattern formed on a printed wiring board 10 (see FIG. 2, which will be described later). Terminal.

The upper surface fixing plate 4 a is for fixing the coaxial connector 8 to the printed wiring board 10. The coaxial connector 8 is fixed by screwing or soldering to the printed wiring board using the holes provided in the upper surface fixing plate 4a.
The back surface fixing plate 4b is also for fixing the coaxial connector 8 to the printed wiring board 10 like the top surface fixing plate 4a. The back surface fixing plate 4b fixes the coaxial connector 8 to the printed wiring board 10 by sandwiching the printed wiring board 10 together with the upper surface fixing plate 4a and soldering.

  In the conventional coaxial connector 8, the upper surface fixing plate 4 a and the rear surface fixing plate 4 b fix the coaxial connector 8 to the printed wiring board 10, the outer conductor through which the return current of the coaxial connector 8 flows, and the printed wiring board 10. In many cases, the signal wiring pattern 11 is provided to connect the GND pattern through which the return current flows. However, in the first embodiment, it is shown only for the purpose of fixing the coaxial connector 8 to the printed wiring board 10. It may be in a different form or not at all. For example, one of the upper surface fixing plate 4a and the rear surface fixing plate 4b (for example, the rear surface fixing plate 4b) is eliminated, and only the other fixing plate (the upper surface fixing plate 4a) is used. The board 4 a) may be provided only on one side of the printed wiring board 10 so that the coaxial connector 8 can be connected to the printed wiring board 10 regardless of the thickness of the printed wiring board 10.

The notch 5 is provided on the flange 2 and is coaxially connected to a GND pad 13 provided on the end surface of the printed wiring board 10 and connected to the inner GND layer 12 when the coaxial connector 8 is connected to the printed wiring board 10. It is used for directly soldering the flange 2 which is a part of the outer conductor of the connector 8 from the back surface.
Further, the cutout portion 5 has a shape in which a surface facing the end face of the printed wiring board 10 is cut out obliquely.

FIG. 2 is a structural diagram of the printed wiring board 10 to which the coaxial connector 8 according to Embodiment 1 of the present invention is connected.
In FIG. 2, the printed wiring board 10 includes a signal wiring pattern 11, a GND layer 12, a GND pad 13, and a conductor pad 14.
The signal wiring pattern 11 is formed on the surface layer of the upper surface of the printed wiring board 10.
The GND layer 12 is provided in the inner layer of the printed wiring board 10 and serves as a return current path for signals flowing through the signal wiring pattern 11.
In the first embodiment, for simplicity of explanation, the signal wiring pattern 11 is a single straight line, and the upper right of the printed wiring board 10 in FIG. 2 is cut off at the end of the printed wiring board 10. However, it is originally connected to a necessary connection destination through an appropriate route.

The GND pad 13 is provided on the end face of the printed wiring board 10 and is connected to the inner GND layer 12. The GND pad 13 is positioned so that it can be soldered at the notch 5 of the coaxial connector 8.
The conductor pad 14 is for fixing the upper surface fixing plate 4a of the coaxial connector 8 by soldering. In FIG. 2, a hole aligned with the screw hole of the upper surface fixing plate 4 a of the coaxial connector 8 is provided, and the coaxial connector 8 and the printed wiring are necessary as needed, such as screwing only, soldering only, screwing and soldering. The plate 10 can be fixed. However, as described above, the upper surface fixing plate 4a of the coaxial connector 8 is shown only for the purpose of fixing the coaxial connector 8 to the printed wiring board 10, so that the screw holes may have other shapes. Or none at all.

FIG. 3 is a perspective view from the upper and lower surfaces in a state where the coaxial connector 8 and the printed wiring board 10 according to Embodiment 1 of the present invention are connected.
FIG. 4 is a cross-sectional view of the state where the coaxial connector 8 and the printed wiring board 10 according to Embodiment 1 of the present invention are connected.
3 and 4, the same components as those described in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description is omitted.
In FIG. 4, the signal wiring pattern 11 of the printed wiring board 10 and the inner GND layer 12 may appear to be short-circuited by the GND pad 13 provided on the end surface of the printed wiring board 10. As shown in FIG. 5, the signal wiring pattern 11 and the GND pad 13 are not in a short circuit because they are out of position.

The GND pad 13 (see FIG. 2) provided on the end face of the printed wiring board 10 is pre-aligned with the notch portion 5 of the coaxial connector 8, so that a soldering iron is inserted into the notch portion 5 and the notch The part 5 and the GND pad 13 of the printed wiring board 10 are soldered (in FIG. 4, the solder 6 indicates the solder that is soldered). In this way, the outer conductor 1 of the coaxial connector 8 and the inner GND layer 12 serving as a return current path of the signal wiring pattern 11 of the printed wiring board 10 are directly connected.
It is assumed that the signal terminal 3 of the coaxial connector 8 is also connected to the signal wiring pattern 11 on the printed wiring board 10 by soldering or the like.

  As described above, according to the first embodiment, the notch 5 for soldering to the end face of the printed wiring board 10 is provided on the flange 2 of the coaxial connector 8, and the signal wiring is provided on the printed wiring board 10 side. A GND pad 13 connected to the inner GND layer 12 serving as the reference GND of the pattern 11 is provided on the end surface of the printed wiring board 10 in accordance with the notch position of the coaxial connector 8, and the notch 5 and the GND pad 13 are soldered. By attaching, the outer conductor of the coaxial connector 8 and the reference GND of the signal wiring pattern 11 are directly connected, so that the return current path at the connection portion of the coaxial line structure and the microstrip line structure is optimally connected. Can do. This enables a good signal connection without impedance mismatch. Moreover, since the notch 5 has a shape in which the surface facing the end surface of the printed wiring board 10 is obliquely cut out, it is easy to insert a soldering iron from the direction perpendicular to the end surface of the printed wiring board 10 and soldering is easy. It becomes.

Embodiment 2. FIG.
In the first embodiment, the cutout portion 5 of the coaxial connector 8 is shown in a form in which the surface facing the end face of the printed wiring board 10 is cut obliquely. Next, an embodiment having another cutout structure will be described. Show.
FIG. 5 is a block diagram showing the structure of the coaxial connector 8 according to Embodiment 2 of the present invention.
In addition, about the structure similar to what was demonstrated in FIG. 1, the overlapping description is abbreviate | omitted. Only the shape of the notch 5 is different from the coaxial connector 8 shown in FIG.
In FIG. 5, the cutout portion 5 has a structure in which the opposing surface and the vertical surface of the end face of the printed wiring board 10 are all cut out vertically.
By making the three surfaces vertical, not only soldering but also a conductor piece that substantially matches the shape of the notch hole is packed, and the coaxial connector 8 and the printed wiring board 10 can be easily connected by soldering. it can. The term “vertical” as used herein does not have to be completely 90 degrees vertical as long as the coaxial connector 8 and the printed wiring board 10 can be connected by a conductor piece pushed in there. Including vertical ones.

FIG. 6 is a diagram illustrating an example in which conductor pieces are packed into the connection between the coaxial connector 8 and the printed wiring board 10.
For example, as shown in FIG. 6, a spring-like conductor piece 7 is inserted between the GND pad 13 on the end face of the printed wiring board 10 and the opposite face of the end face of the printed wiring board 10 in the notch portion 5, and the spring force is applied. If the outer conductor of the coaxial connector 8 and the GND pad 13 are connected and the spring-like conductor piece 7 is held, the coaxial connector 8 and the printed wiring board 10 can be easily connected by soldering.
In the case of connecting with the spring-like conductor piece 7, if the coil shape is used, the path through which the return current flows is narrow and long and becomes an inductance component. A shape that can be connected to the GND pad 13 at the end of the printed wiring board 10 is desirable.

  As described above, according to the second embodiment, the coaxial connector 8 and the printed wiring board 10 can be connected more easily than when soldering.

Embodiment 3 FIG.
FIG. 7 is a block diagram showing the structure of the coaxial connector 8 according to Embodiment 3 of the present invention.
In addition, the overlapping description is abbreviate | omitted about the structure similar to what was demonstrated in FIG. 1, FIG. Only the shape of the notch 5 is different from the coaxial connector 8 shown in FIGS.
Compared with the cutout portion 5 in FIG. 5, the cutout portion 5 in FIG. 7 has a structure in which both the right and left vertical surfaces are cut obliquely with respect to the end face of the printed wiring board 10.

  As described above, according to the third embodiment of the present invention, it is easy to insert the soldering iron from the left and right in the horizontal direction with respect to the end surface of the printed wiring board 10, and soldering from the horizontal direction is facilitated. .

Embodiment 4 FIG.
FIG. 8 is a block diagram showing the structure of the coaxial connector 8 according to Embodiment 4 of the present invention.
In addition, the overlapping description is abbreviate | omitted about the structure similar to what was demonstrated in FIG.1, FIG5 and FIG.7. Only the shape of the notch 5 is different from the coaxial connector 8 shown in FIGS.
In FIG. 8, the cutout portion 5 has a structure in which the opposing surface of the end surface of the printed wiring board 10 and the left and right vertical surfaces are all cut out obliquely.

  As described above, according to the fourth embodiment of the present invention, the soldering iron can be viewed from either the left or right direction in the horizontal direction with respect to the end surface of the printed wiring board 10 or from the direction perpendicular to the end surface of the printed wiring board 10. It is easy to insert the solder and soldering is easy from both horizontal and vertical directions.

Embodiment 5. FIG.
FIG. 9 is a block diagram showing the structure of the coaxial connector 8 according to Embodiment 5 of the present invention.
In addition, about the structure similar to what was demonstrated in FIG.1, FIG.5, FIG.7 and FIG. 8, the overlapping description is abbreviate | omitted. Only the shape of the notch 5 is different from the coaxial connector 8 shown in FIGS. 1, 5, 7 and 8.
Compared with the notch portion 5 in FIG. 5, the notch portion 5 in FIG. 9 has a structure in which only the opposing surface of the end face of the printed wiring board 10 and the vertical surface far from the center conductor 3 are obliquely notched.
The return current flowing through the outer conductor of the coaxial connector 8 has the highest density in the vicinity of the cylindrical surface close to the central conductor 3, and therefore, it is preferable to connect at a position as close as possible to the outer conductor cylinder when soldering. Therefore, as shown in FIG. 9, only the opposing surface of the cutout portion 5 at the end of the printed wiring board 10 and the vertical surface far from the central conductor 3 are cut out obliquely.

  As described above, according to the fifth embodiment of the present invention, it becomes easy to perform intensive soldering to a position close to the cylinder of the outer conductor.

  In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .

  DESCRIPTION OF SYMBOLS 1 Coaxial part, 2 flange, 3 Signal terminal, 4a Upper surface fixing plate, 4b Back surface fixing plate, 5 Notch part, 6 Solder, 7 Spring-like conductor piece, 8 Coaxial connector, 10 Printed wiring board, 11 Signal wiring pattern, 12 GND layer, 13 GND pads, 14 conductor pads.

Claims (10)

In a coaxial connector for connecting a coaxial transmission line such as a coaxial cable to a printed wiring board in a horizontal direction,
A conductor integrated with an outer conductor of the coaxial connector, and includes a flange provided so as to contact an end surface of the printed wiring board to which the coaxial connector is connected;
Wherein the flange, coaxial connector, characterized in that notches for inserting the connecting member for electrically connecting the GND pad and the flange provided on the end face of the printed wiring board is provided.   The coaxial connector according to claim 1, wherein the notch has a shape in which a surface facing the end surface of the printed wiring board is obliquely cut.   2. The coaxial connector according to claim 1, wherein the notch has a shape in which all of the opposing surface and the vertical surface of the end face of the printed wiring board are vertically cut out.   2. The coaxial connector according to claim 1, wherein the cutout portion has a shape in which left and right vertical surfaces are cut obliquely with respect to an end surface of the printed wiring board.   2. The coaxial connector according to claim 1, wherein the notch has a shape in which an opposing surface of an end surface of the printed wiring board and a right and left vertical surface are all cut obliquely.   2. The coaxial according to claim 1, wherein the notch has a shape in which only a facing surface of an end surface of the printed wiring board and a vertical surface far from the center conductor of the printed wiring board are cut obliquely. connector. A fixing plate for fixing the coaxial connector to the printed wiring board;
The coaxial connector according to claim 1, wherein the fixing plate is provided only on one side of the printed wiring board. A fixing plate for fixing the coaxial connector to the printed wiring board;
The coaxial connector according to any one of claims 1 to 6, wherein the fixing plate is provided vertically so as to sandwich the printed wiring board. In the board | substrate connection structure which connects the coaxial connector of any one of Claims 1-8, and the said printed wiring board,
The printed wiring board includes a signal wiring pattern on an upper surface layer, a GND layer serving as a return current path of a signal flowing through the signal wiring pattern on an inner layer, and the GND pad connected to the GND layer on an end surface.
The connecting member is solder;
A board connection structure , wherein the flange integrated with an outer conductor of the coaxial connector and provided with the notch and the GND pad are electrically connected by the solder . In the board | substrate connection structure which connects the coaxial connector of any one of Claims 1-8, and the said printed wiring board,
The printed wiring board includes a signal wiring pattern on an upper surface layer, a GND layer serving as a return current path of a signal flowing through the signal wiring pattern on an inner layer, and the GND pad connected to the GND layer on an end surface.
The connecting member is a conductor piece;
The flange integrated with the outer conductor of the coaxial connector and provided with the notch and the GND pad are electrically connected by the conductor piece arranged in the notch. Board connection structure.

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