JPH07135037A - Coaxial cable connecting board and manufacture thereof - Google Patents

Abstract

PURPOSE:To connect a coaxial cable stably by positioning it accurately without enlarging the land parts. CONSTITUTION:A central conductor groove 11 having at least a part of a central conductor 4 of a coaxial cable 2 inside is formed in one land part 9, and an external conductor groove 12 having at least a part of an external conductor 5 of the coaxial cable 2 inside with a width and a depth larger than the central conductor groove 11 is formed in the other land part 10, so as to extend respectively in the arranging direction of the land parts 9 and 10. The central conductor 4 of the coaxial cable 2 is soldered in a condition where at least the part is arranged in the central conductor groove 11 of one land part 9, and the external conductor 5 is soldered in a condition where at least the part is arranged in the external conductor groove 12 of the other land part 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate for connecting a coaxial cable used in electronic equipment such as a computer and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a substrate for connecting a coaxial cable,
The configuration shown in FIG. 9 is adopted. This connects a coaxial cable 33 having a center conductor 31 and an outer conductor 32 which is coaxial with the center conductor 31 and is provided on the outside. The center conductor 31 and the outer conductor 32 are individually connected. The land portions 35 and 36 are arranged at a predetermined distance from each other. In particular, when connecting a thin coaxial cable having an outermost diameter of about 1 mm, the center conductor 31 and the outer conductor 32 are directly soldered to the corresponding land portions 35 and 36 because the connector is difficult to use. It is designed to let you. Here, conventionally, the land portion 35,
An upper surface of 36, which connects the central conductor 31 and the outer conductor 32, is formed in a planar shape.

[0003]

In the coaxial cable connecting substrate having the above-described structure, since the upper surface of the land portion is formed in a flat shape, the center conductor and the outer conductor having a circular cross section are formed on the upper surface of the land portion. There is a problem that it rolls easily, and it is difficult to stably solder at a fixed position. Therefore, it is possible to increase the size of the land portion, but this causes a problem that the substrate area increases. Therefore, an object of the present invention is to provide a coaxial cable connecting substrate and a manufacturing method thereof that can accurately position and stably connect a coaxial cable having a center conductor and an outer conductor without enlarging the land portion. It is to be.

[0004]

In order to achieve the above object, a coaxial cable connecting substrate of the present invention comprises a center conductor,
A coaxial cable having an outer conductor coaxial with the central conductor and provided on the outside, in which a plurality of lands for individually connecting the central conductor and the outer conductor are arranged at a predetermined distance from each other. The one land portion has a center conductor groove for arranging at least a part of the center conductor inside, and the other land portion has at least a part of an outer conductor arranged inside. The outer conductor groove having a width and depth larger than that of the center conductor groove is formed so as to extend along the arrangement direction of the land portions.

A method of manufacturing a coaxial cable connecting substrate according to the present invention comprises a center conductor and an outer conductor of a coaxial cable having a center conductor and an outer conductor coaxially arranged with the center conductor. A method for manufacturing a coaxial cable connecting substrate, in which a plurality of individually connected land portions are arranged at a predetermined distance from each other, wherein a resist layer is provided on a conductive layer provided on the substrate body, and the resist layer is provided on the conductive layer. It is characterized in that openings having different widths are arranged in series at a predetermined distance from each other and etching is performed.

[0006]

According to the coaxial cable connecting substrate of the present invention, a central conductor groove for arranging at least a part of the central conductor therein is provided in one land portion, and an outer conductor is provided inside the other land portion. Outer conductor grooves having a width and a depth larger than those of the center conductor groove, in which at least a part of the above are arranged, are formed to extend along the arrangement direction of the land portions. Therefore,
When soldering a coaxial cable, at least a part of the center conductor of the coaxial cable is disposed in the center conductor groove of one land portion, and the outer conductor is at least part of the center conductor groove of the other land portion. Since a part of the coaxial cable is soldered in a state where it is arranged, the coaxial cable having the center conductor and the outer conductor can be accurately positioned and stably connected without increasing the size of the land portion.

According to the method for manufacturing a coaxial cable connecting substrate of the present invention, a resist layer is provided on the conductive layer provided on the substrate body, and openings of different widths are separated from each other in series in the resist layer. It will be arranged and formed, and etching will be applied,
Since the openings have different widths, the conductive layers facing these openings have different etching rates, and the grooves formed in the conductive layers have different widths and depths. That is, the central conductor groove having a small width and depth is formed by the opening having a small width, and the external conductor groove having a large width and depth is formed by the opening having a large width by one etching.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A coaxial cable connecting board according to an embodiment of the present invention will be described below with reference to the drawings. Figure 1
In the figure, reference numeral 1 denotes a coaxial cable connecting substrate of this embodiment, and reference numeral 2 denotes a coaxial cable connected to the coaxial cable connecting substrate 1. The coaxial cable 2 is of a thin wire type having an outermost diameter of about 1 mm, and has a cylindrical central conductor 4, a cylindrical inner insulating portion (not shown) covering the central conductor 4 all around, and the central conductor. A cylindrical outer conductor 5 coaxial with 4 and provided outside the inner insulating portion,
And an outer insulating portion 6 that covers the outside of the outer conductor 5. Then, in order to perform the connection, the outer conductor 5 and the inner insulating portion (not shown) are projected to the outer side of the outer insulating portion 6 by the same length at the end portion in the axial direction, and the center conductor 4 is extended to the outer side by the predetermined length. It is in a projected state.

The coaxial cable connecting substrate 1 has a plate-shaped substrate body 8 on which a land portion for a central conductor made of a conductive material such as copper foil and having substantially the same height is formed. 9 and the land portion 10 for the outer conductor, and a circuit portion (not shown) made of a conductive material such as copper foil connected to the land portion 9 for the center conductor and the land portion 10 for the outer conductor. Here, the land portion 9 for the central conductor is the coaxial cable 2
Is a portion to which the central conductor 4 of is connected by soldering,
The outer conductor land portion 10 is the outer conductor 5 of the coaxial cable 2.
Is a portion to be connected by soldering, and the center conductor land portion 9 and the outer conductor land portion 10 are arranged at a predetermined distance from each other. The outer conductor land portion 10 constitutes, for example, a part of an earth circuit.

In the present embodiment, as shown in FIG. 2, the center conductor groove 11 is provided on the upper surface of the center conductor land portion 9, and the center conductor land portion 9 and the outer conductor land portion 10 are arranged. It is formed at the center position in the width direction (direction orthogonal to the arrangement direction) so as to extend along the direction. The center conductor groove 11 has a substantially semicircular cross section in a direction orthogonal to the extending direction and is recessed. Further, the outer conductor groove 12 is formed on the upper surface of the outer conductor land portion 10.
It is formed at a substantially central position in the width direction so as to extend along the arrangement direction of the center conductor land portion 9 and the outer conductor land portion 10. The outer conductor groove 12 has a substantially semicircular cross section in a direction orthogonal to the extending direction. Here, for example, the diameter of the outer conductor groove 12 is formed to be substantially the same as the diameter of the outer conductor 5, and the diameter of the center conductor groove 11 is smaller than the diameter of the outer conductor groove 12 by a predetermined amount. The diameter of the center conductor 4 is slightly larger than that of the center conductor 4.
1 and the outer conductor groove 12 are formed to be substantially coaxial. Since the land portion 9 for the center conductor and the land portion 10 for the outer conductor have substantially the same height, the groove 12 for the outer conductor is larger in diameter, width and depth than the groove 11 for the center conductor. .

According to the coaxial cable connecting substrate 1 having such a configuration, the central conductor land portion 9 is provided with the central conductor groove 11 for the central conductor 4 having a substantially semicircular cross section. 9 and the outer conductor land portion 10 are formed to extend along the arrangement direction, and the outer conductor land portion 10 includes:
Groove 1 for outer conductor 5 having a substantially semicircular cross section and having a center conductor
Groove 12 for outer conductor having a diameter, width and depth larger than 1
, The center conductor land portion 9 and the outer conductor land portion 1
It is formed so as to extend along the arrangement direction of 0. Therefore, when soldering the coaxial cable 2,
The outer conductor 5 is placed in the outer conductor groove 12 of the outer conductor land portion 10 in a substantially fitted state, and the central conductor 4 is partly arranged in the central conductor groove 11 and soldered. It will be. Therefore, the coaxial cable 2 having the center conductor 4 and the outer conductor 5 can be accurately positioned and stably connected without increasing the size of the center conductor land portion 9 and the outer conductor land portion 10. Therefore, even when applied to the thin coaxial cable 2, it is possible to realize a highly accurate connection with high positioning accuracy.

Moreover, in the coaxial cable connecting substrate 1 of this embodiment, the diameter of the outer conductor groove 12 is formed to be substantially the same as the diameter of the outer conductor 5, and the diameter of the center conductor groove 11 is set to the center conductor. Since the outer conductor groove 12 and the center conductor groove 11 are formed to have a diameter slightly larger than the diameter of 4, the outer conductor 5 of the coaxial cable 2 is connected to the outer conductor groove 12.
It is placed in the fitted state without difficulty in the
Can be located in the center conductor groove 11. Therefore, highly accurate positioning of the coaxial cable 2 can be easily performed.

The cross-sectional shapes of the center conductor groove 11 and the outer conductor groove 12 may be, for example, substantially arcuate or substantially rectangular, even if they are not substantially semicircular. The width and depth of the outer conductor groove 12 may be set to be larger than that of the center conductor groove 11. However,
Since the central conductor 4 and the outer conductor 5 have a circular cross section, the cross sectional shape is preferably substantially semicircular. Further, the outer conductor groove 12 is arranged to place the outer conductor 5 in a fitted state. However, at least a part of the outer conductor 5 is the outer conductor in order to achieve a purpose such as highly accurate positioning. It suffices that the center conductor 4 is located in the groove 12 for use and at least a part of the center conductor 4 is located in the groove 11 for use in the center conductor. However, it is preferable to adopt the configuration of this embodiment because the positioning becomes more accurate. In addition, the diameter of the center conductor groove 11 can be set to be substantially the same as the diameter of the center conductor 4, and these can also be fitted. Further, when the coaxial cable 2 has a plurality of outer conductors 5, the outer conductor land portion 10 and the outer conductor groove 1 are formed in accordance with the increased outer conductors 5.
You can increase 2.

Next, a method of manufacturing the coaxial cable connecting substrate 1 having the above-described structure will be described step by step. In the following description, the formation of the central conductor land portion 9 and the outer conductor land portion 10 according to the present invention will be mainly described, and the description of the portions such as the circuit portion formed in the conventional manner will be omitted. . First, as shown in FIG. 3, a copper-clad laminate 15 in which a copper foil 14 is laminated as a conductive layer on the substrate body 8 is prepared. Then, a photosensitive resist layer 16 is formed on the copper foil 14 of the copper-clad laminate 15.

Next, by exposing using a mask, as shown in FIG. 4, a substantially rectangular shape having a predetermined width and a predetermined length is formed in the vicinity of the edge of the resist layer 16 and penetrates in the layer thickness direction. A large opening 17 is formed, and a substantially rectangular shape having a predetermined width smaller than the large opening 17 and a predetermined length is penetrated through the resist layer 16 on the inner side at a predetermined distance from the large opening 17 in the layer thickness direction. The small width opening 18 is formed so as to be separated from the large diameter opening 17 by a predetermined distance. Where these large openings 1
7 and the narrow width opening 18 are arranged in series so that the center lines that divide the width direction into two equal parts are located substantially on the same straight line.

Then, etching is performed. Here, as the etching liquid, one having viscosity is used. Then, as shown in FIG.
As shown in (a) and (b), the large opening 17 and the narrow opening 18 have different widths, and the etching solution has viscosity, so that the etching solution circulates poorly in the narrow opening 18 and the etching rate is slow. On the other hand, in the large opening 17, the etching solution is sufficiently circulated and the etching rate is increased. As a result, in the portion of the copper foil 14 that is etched from the narrow opening 18, the central conductor groove 11 having a small diameter, width, and depth is formed in the portion of the copper foil 14 that is largely etched from the opening 17. The outer conductor groove 12 having a large diameter, width and depth is formed.

As described above, the etching amount can be controlled by the difference in the widths of the small width opening 18 and the large opening 17, whereby the center conductor groove 11 and the outer conductor groove 12 having different diameters, widths and depths can be formed. , Can be formed on the same substrate by one etching (see FIG. 6). Here, the widths of the small width opening 17 and the large opening 18 are appropriately set so that the diameters of the center conductor groove 11 and the outer conductor groove 12 become the above-described diameters. next,
As shown in FIG. 6, the resist layer 16 is removed. Then, as shown in FIG. 7, a resist layer 20 is again coated with electrodeposition or liquid resist on the copper foil 14 and covers a predetermined range including the center conductor groove 11 and the outer conductor groove 12.
To provide.

By exposing using a mask, as shown in FIGS. 7 and 8A and 8B, a resist layer 20a covering the center conductor groove 11 and the resist layer 20a.
Layer 20 covering the outer conductor groove 12 separated from the
b and remain, and other resist layers are removed. here,
The resist layer 20a is substantially overlapped with the center conductor groove 11 in the longitudinal direction of the center conductor groove 11, and in the width direction of the center conductor groove 11, the bisector in the width direction is the center conductor groove 11 of the center conductor groove 11. It is almost overlapped with the bisector in the width direction. Similarly, the resist layer 20b is overlapped with the outer conductor groove 12 in the longitudinal direction of the outer conductor groove 12, and in the width direction of the outer conductor groove 12, the bisector in the width direction is the outer conductor groove. Twelve widthwise bisectors are overlapped. Then, etching is performed, and thereafter, the resist layers 20a, 2
Remove 0b. As a result, the center conductor land portion 9 having the center conductor groove 11 and the outer conductor land portion 10 having the outer conductor groove 12 are formed.
Further, the center conductor land portion 9 and the outer conductor land portion 10 are subjected to solder plating or the like, if necessary.

As described above, the coaxial cable connecting substrate 1 having the above-described structure shown in FIG. 2 is formed. Then, as shown in FIG. 1, the outer conductor 5 is placed in the outer conductor groove 12 of the outer conductor land portion 10 in a fitted state, and the center conductor 4 is placed in the center conductor groove 11 of the center conductor land portion 9. These are soldered while being placed inside. According to the above manufacturing method, the small-width opening 18 allows the center conductor groove 11 having a small diameter, width, and depth to be formed, and the large opening 17 allows the center conductor groove 11 to have an outside diameter, width, and depth larger than that of the center conductor. The conductor groove 12 can be formed by one etching. In the above embodiment, the center conductor groove 1
1 and the etching for forming the outer conductor groove 12 are performed in advance, and after that, the etching for forming the center conductor land portion 9 and the outer conductor land portion 10 is performed. It is also possible to perform the etching at the same time at the same time. However, when the etching is performed separately as in the present embodiment, the center conductor groove 11,
This is advantageous because the outer conductor groove 12, the center conductor land portion 9, and the outer conductor land portion 10 can be accurately formed.

[0020]

According to the coaxial cable connecting substrate of the present invention, the center conductor groove for arranging at least a part of the center conductor inside is formed in one land portion, and the other land portion is formed inside. Outer conductor grooves having a width and a depth larger than those of the center conductor groove, in which at least a part of the outer conductors are arranged, are formed so as to extend along the arrangement direction of the lands. Therefore, when soldering a coaxial cable, at least a part of the center conductor of the coaxial cable is arranged in the groove for the central conductor of one land portion, and the outer conductor is arranged in the groove for the outer conductor of the other land portion. Since at least a part of the coaxial cable will be soldered in the arranged state, the coaxial cable having the center conductor and the outer conductor can be accurately positioned and stably connected without increasing the size of the land portion. it can. Therefore, even if it is applied to a thin coaxial cable, it is possible to realize a highly accurate connection with high positioning accuracy.

According to the method of manufacturing the coaxial cable connecting substrate of the present invention, the resist layer is provided on the conductive layer provided on the substrate body, and openings of different widths are separated from each other by a predetermined distance in the resist layer. Since the openings are arranged and formed in series and the widths of the openings are different, the etching rates of the conductive layers facing these openings are different, and the grooves formed in the conductive layers have a width and a depth of But different. That is, it is possible to form the central conductor groove having a small width and depth by the opening having a small width, and the external conductor groove having a large width and depth by the etching having a large width by one etching.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state before soldering in which a coaxial cable is connected to a coaxial cable connecting substrate according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state after formation of a land portion of the coaxial cable connecting substrate according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a copper-clad laminate of a substrate for connecting a coaxial cable according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a coaxial cable connecting substrate according to an embodiment of the present invention in which a resist layer formed on a copper-clad laminate is provided with openings having different widths.

FIG. 5 is a cross-sectional view showing a state in which a copper-clad laminate is etched from openings having different widths, in the coaxial cable connecting substrate according to one embodiment of the present invention, and FIG. , (B) show a large opening side.

FIG. 6 is a perspective view showing a state in which a groove is formed in a copper-clad laminate by etching in a coaxial cable connecting substrate according to an embodiment of the present invention.

FIG. 7 is a perspective view showing a state in which a resist layer is formed on the copper-clad laminate of the coaxial cable connecting substrate according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a state in which a resist layer including a groove is left in a copper-clad laminate of a coaxial cable connecting substrate according to an embodiment of the present invention, and (a) is a center conductor groove side. (B) shows the outer conductor groove side.

FIG. 9 is a perspective view showing a state immediately before soldering a coaxial cable to a conventional coaxial cable connecting substrate.

[Explanation of symbols]

1 ... Coaxial cable connection substrate, 2 ... Coaxial cable, 4 ...
Central conductor, 5 ... External conductor, 8 ... Substrate body, 9, 10 ... Land portion, 11 ... Central conductor groove, 12 ... External conductor groove, 1
4 ... Copper foil (conductive layer), 16, 20 ... Resist layer

Claims (2)

[Claims] 1. A center conductor (4) of a coaxial cable (2) having a center conductor (4) and an outer conductor (5) provided coaxially with the center conductor (4) and provided outside the center conductor (4). In a coaxial cable connecting board in which a plurality of lands (9, 10) for individually connecting to the outer conductor (5) are arranged at a predetermined distance from each other, one land part (9) has an inner side. The center conductor groove (11) for disposing at least a part of the center conductor (4) in the other land part (10) disposes at least a part of the outer conductor (5) inside, The outer conductor groove (12), which is wider and deeper than the conductor groove (11), is the land part (9, 10).
A coaxial cable connecting substrate, which is formed so as to extend along the arrangement direction of. 2. The center conductor (4) of a coaxial cable (2) having a center conductor (4) and an outer conductor (5) provided coaxially with the center conductor (4) and provided on the outside. A method for manufacturing a coaxial cable connecting board, comprising a plurality of lands (9, 10) which are individually connected to an outer conductor (5) and are spaced apart from each other by a predetermined distance. The resist layer (1
6) is provided, openings (17, 18) of different widths are arranged in series in the resist layer (16) at a predetermined distance from each other, and are etched, and a coaxial cable connecting substrate is characterized by being etched. Production method.