JP2008172424A - Glass antenna for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ground the outside conductor of a coaxial cable to a car body in a simple structure with no use of an earth wire when grounding the car body to an antenna pattern that is connected to the outside conductor of the coaxial cable, and to provide flexibility in arrangement of a coaxial connector. <P>SOLUTION: There are provided an antenna pattern 27 and an earth pattern 21 which are pasted on the glass surface of an automobile, a coaxial cable 28 wired in a car body, a coaxial connector 23 which connects an inside conductor 28b of the coaxial cable 28 to the antenna pattern 27 while connects an outside conductor 28a of the coaxial cable 28 to the earth pattern 21, and a grounding connecting plate 22 consisting of a metal plate that is attached to the car body and comprises a protruding part 22a that contacts to the earth pattern. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a glass antenna for an automobile, and more particularly, to improve a grounding structure in a glass antenna connected to a receiver in a vehicle via a coaxial cable.

Recently, glass antennas are often used for radio / TV antennas mounted on automobiles for reasons of appearance. For the connection from the antenna pattern of the glass antenna to the receiver, a coaxial cable or a coaxial connector is often used to prevent noise from entering the signal line. In this case, the outer conductor of the coaxial connector is connected to the ground pattern to form a ground wire, and the ground wire is connected to the vehicle body and grounded.
Depending on the length of the grounding wire to the vehicle body grounding position and the wiring position, the antenna performance may be affected and the antenna performance may be changed. Therefore, the grounding grounding structure is important for enhancing the antenna performance.

For this reason, various antenna grounding structures have been provided.
For example, in Japanese Patent Laid-Open No. 2006-173658 (Patent Document 1), an antenna module that does not have a ground pattern is mounted on glass, and a coaxial connector is connected in the middle of routing of a coaxial cable connected to the antenna module. The outer conductor of the coaxial connector is fixed and electrically connected to the pillar portion via a fixing bracket to ground the antenna.

JP 2006-173658 A

In the structure of Patent Document 1, an antenna module is attached to a glass surface, and a feeding point of the antenna module is connected to a coaxial cable. However, a special technique is required for this configuration, and productivity is poor. And the coaxial cable connected to the antenna module is only fixed to the glass at the feeding point at the end of the glass surface, and the coaxial cable itself is not fixed to the glass. There is a problem that gets in the way.
In addition, when connecting the outer conductor of the coaxial cable to the vehicle body via a fixing bracket,
Since it is necessary to provide a screw-fastening hole in the car body (pillar) in advance, the coaxial connector must be fitted to the screw-fastening hole in the correct position and there is no freedom in the arrangement of the coaxial connector. There's a problem.

  The present invention has been made in view of the above problems, and it is possible to connect the ground pattern of the glass antenna connected to the outer conductor of the coaxial cable to the vehicle body without going through the wiring, thereby improving the productivity and the antenna. The challenge is to create a grounding structure that does not affect performance.

In order to solve the above problems, the present invention provides an antenna pattern and a ground pattern that are attached to the surface of an automotive glass,
A coaxial cable routed into the car body,
A coaxial connector connected to one end of the coaxial cable, connecting the antenna pattern and the inner conductor of the coaxial cable and connecting the ground pattern and the outer conductor of the coaxial cable;
A grounding coupling plate made of a metal plate that is attached to the vehicle body and has a protrusion that is brought into contact with the ground pattern;
A glass antenna for an automobile is provided.

  In the present invention, as described above, the ground pattern to be bonded to the glass surface is not connected to the vehicle body via the ground wire by connecting to the outer conductor of the coaxial cable, but is welded to the vehicle body to the ground pattern on the glass surface. Since the earth ground coupling plate is in direct contact, the antenna can be grounded with a simple structure. Further, since the ground wire is not routed unnecessarily, noise does not enter from the ground wire, and the antenna performance can be improved.

Specifically, the antenna pattern and the ground pattern are made of a conductor, and the ground pattern is disposed along the periphery of the glass,
The coupling plate is L-shaped, the tip of one side thereof is attached to the vehicle body on the periphery of the glass and the other side is disposed on the ground pattern side of the glass surface, and protrudes from the inner surface of the other side. The tip of the protrusion is in contact with the ground pattern.

As described above, since it is only necessary to bring the protrusion of the coupling plate that takes the body ground (vehicle body ground) into contact with the ground pattern made of a conductor, by increasing the ground pattern to some extent, mounting accuracy is not required, and The body earth can be surely taken.
That is, there is no need to arrange the coaxial connector in accordance with the position of the screw fixing hole provided in the vehicle body in advance as in Patent Document 1, and there is a degree of freedom in the arrangement of the coaxial connector and the ground pattern. The workability can be improved.
In addition, by arranging the antenna pattern in the vicinity of the ground pattern, the antenna can be grounded at a position closest to the antenna pattern, and noise can hardly enter and the antenna performance can be improved.

  As described above, in the glass antenna for automobiles of the present invention, the protrusion of the coupling plate welded to the vehicle body is directly brought into contact with the ground pattern to be attached to the glass surface, so that the vehicle body is grounded. The ground connection structure can be provided very easily as compared with the case of interposing and connecting to the vehicle body. Further, since the ground wire is not routed unnecessarily, noise does not enter from the ground wire, and the antenna performance can be improved.

Embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention.
FIG. 1 shows a glass antenna device 20 attached to the surface of a rear glass 12 of an automobile. In the present embodiment, two glass antenna devices 20A and 20B are arranged in the width direction X of the vehicle body 13, one glass antenna device 20A is for receiving radio signals, and the other glass antenna device 20B is for receiving TV signals.
A ground pattern 21 made of a strip-shaped conductor is disposed in the width direction X of the vehicle body along the upper peripheral edge of the interior surface of the rear glass 12. An antenna pattern 27 made of a conductor is arranged on the surface of the rear glass 12.

A coaxial connector 23 is disposed between the ground pattern 21 and the antenna pattern 27. The male connector 24 of the coaxial connector 23 includes a ground contact portion 24 a and a signal connection portion 24 b, and the ground contact portion 24 a is connected to the ground pattern 21 via a conductor pattern 29. The signal connection portion 24b is connected to an antenna pattern 27 made of a conductor via a land portion 26.
The female connector 25 connected to one end of the coaxial cable 28 is fitted to the male connector 24, the outer conductor 28a of the coaxial cable 28 is connected to the ground pattern 21, and the center conductor 28b of the coaxial cable 28 is connected to the antenna pattern 27. is doing.

The grounding coupling plate 22 is made of a metal plate, has an L-shaped cross section, and has substantially the same length as the ground pattern 21 in the width direction X of the vehicle body 13. The front end 22c of the one side portion 22g is welded to the vehicle body 13 on the periphery of the glass, and the other side portion 22f is disposed on the ground pattern 21 side of the glass surface. On the surface facing the vehicle body 13 that is the inner surface 22d of the other side portion 22f of the coupling plate 22, an inverted conical projection 22a having a flat tip is projected by welding.
When the rear glass 12 is attached to the vehicle body 13, the rear glass 12 is sandwiched between the vehicle body 13 and the coupling plate 22, and the rear glass 12 is fixed so that the end of the rear glass 12 is in contact with one side portion 22 g of the coupling plate 22. The ground pattern 21 provided in the contact with the tip of the protrusion 22a.
Note that the protrusion 22 a is not limited to a conical shape, and may be any shape that can contact the ground pattern 21, and may be integrally formed with the coupling plate 22.

The coaxial connector 23 includes a male connector 24 and a female connector 25. The male connector 24 has a ground contact portion 24a and a signal connection portion 24b projecting from the side surface of the housing 24e, the signal connection portion 24b is soldered to the land portion 26 of the antenna pattern 27, and the ground contact portion 24a is grounded. It is fixed to the glass surface of the rear glass 12 by soldering to a conductor pattern 29 connected to the pattern 21.
The signal connection portion 24b is connected to a male signal terminal 24c projecting from the bottom surface of the housing 24e, and the ground contact portion 24a is connected to the ground terminal 24d inside the side surface of the housing 24e through the bottom surface of the housing 24e. is doing.

  The female connector 25 is connected to one end of the coaxial cable 28, the outer conductor 28a of the coaxial cable 28 is connected to the ground contact portion 25a of the female connector 25, and the center conductor 28b of the coaxial cable 28 is the female signal terminal 25b. The female signal terminal 25b is provided to face the male signal terminal 24c of the male connector 24 in a direction Z that is 90 degrees downward with respect to the length direction Y of the coaxial cable 28.

  When the female connector 25 is fitted from above the male connector 24, the female signal terminal 25 b and the male signal terminal 24 c come into contact with each other, and the central conductor 28 b of the coaxial cable 28 is connected to the antenna pattern 27. Further, the ground contact portion 25 a of the female connector 25 is connected to the ground terminal 24 d of the male connector 24, and the outer conductor 28 a of the coaxial cable 28 is connected to the ground pattern 21, via the protrusion 22 a of the coupling plate 22. Grounded to the vehicle body 13.

The coaxial cable 28 is routed from above the rear glass 12 along the pillar portion 12a on the side surface side of the rear glass 12, is connected to a receiver (not shown), and transmits a signal received by the antenna pattern 27 to the receiver. Yes.
Further, the cover 14 is covered from the vehicle body 13 side to the glass surface so that the glass antenna device 20 cannot be seen from the passenger compartment.

According to the above configuration, the ground pattern 21 connected to the outer conductor 28a of the coaxial cable 28 is not directly connected to the vehicle body 13 using the ground wire, but is brought into direct contact with the coupling plate 22 bonded to the vehicle body 13. Therefore, the antenna can be grounded with a simple structure.
The ground pattern 21 is arranged on the glass surface with a predetermined length, and the ground contact portion 24a of the coaxial connector 23 is brought into contact at an arbitrary position so that the outer conductor 28a of the coaxial cable 28 is connected to the ground pattern 21. Therefore, a degree of freedom is generated in the arrangement position of the coaxial connector 23, and the workability of attaching the coaxial connector 23 can be improved.
Furthermore, since the ground point to the antenna pattern 27 and the vehicle body 13 can be brought close to each other, noise does not enter the glass antenna device 20 and the antenna characteristics can be improved.

  In addition, this invention is not limited to this embodiment, The attachment to the vehicle body 13 of the coupling plate 22 for earthing may be screwed instead of welding. A hook part provided with a screw hole is provided at the tip of one side of the grounding connecting plate 22 and a screw hole is provided in the vehicle body. The connecting plate 22 is screwed to the vehicle body, and the connecting plate 22 attaches the rear glass 12 to the vehicle body. When fixed so as to be pressed against the vehicle body 13, the ground pattern 21 comes into contact with the tip of the protrusion 22 a of the coupling plate 22.

FIG. 5 shows a second embodiment of the present invention.
The ground patterns 21 of the two glass antenna devices 20 arranged in the width direction X of the vehicle body 13 are made one continuous, and the coupling plate 22 is made one continuous.
Protrusions 22 a and 22 b projecting from a surface 22 d facing the vehicle body 13 on one side of the coupling plate 22 are provided one by one in the vicinity of each coaxial connector 23.
According to the said structure, even if the several glass antenna apparatus 20 is arrange | positioned, since the earth pattern 21 and the coupling plate 22 should just be attached, the attachment operation | work of the earth pattern 21 and the coupling plate 22 becomes easy.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 6 shows a third embodiment of the present invention.
The protrusion 22a protruding from the facing surface 22d of the coupling plate 22 and the vehicle body 13 is elongated in the width direction X of the vehicle body 13 of the coupling plate 22, and in this embodiment, the vehicle body 13 width direction X of the coupling plate 22 is. The length is almost the same. The protrusion 22a may have a rectangular cross section or an inverted triangular shape.
With the above configuration, since the contact surface between the ground pattern 21 and the protrusion 22a increases, the ground pattern 21 and the protrusion 22a can be reliably brought into contact with each other to ground the glass antenna.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 7 shows a fourth embodiment of the present invention.
The protruding portion 22a is not welded to the coupling plate 22 and protruded, but the coupling plate 22 is bent into a V shape to provide a protruding portion 22a on the surface 22d facing the vehicle body 13 to form the protruding portion 22a. It is in contact.
Since the protrusion 22a is continuously provided in the width direction X of the vehicle body of the coupling plate 22, the contact surface between the ground pattern 21 and the protrusion 22a increases, and the ground pattern 21 and the protrusion 22a are reliably brought into contact with the glass. The antenna can be grounded.

  In addition, this invention is not limited to the said embodiment, The various form within the claim of this invention is included.

It is a perspective view which shows 1st Embodiment of the glass antenna for motor vehicles which is this invention. It is a principal part enlarged view of the glass antenna for motor vehicles. It is AA sectional drawing. It is explanatory drawing of a coaxial connector, (A) is a perspective view, (B) is sectional drawing. It is a figure which shows 2nd Embodiment. It is a figure which shows 3rd Embodiment. It is a figure which shows 4th Embodiment.

Explanation of symbols

20 (20A, 20B) Glass antenna device 21 Ground pattern 22 Coupling plate 22a Protruding portion 23 Coaxial connector 24 Male connector 24a Ground contact portion 24b Signal connection portion 24c Male signal terminal 24d Ground terminal 25 Female connector 25a Ground contact portion 25b Female signal terminal 27 Antenna pattern 28 Coaxial cable 28a Outer conductor 28b Center conductor X Width direction of the vehicle body

Claims (2)

An antenna pattern and a ground pattern that are attached to the glass surface for automobiles,
A coaxial cable routed into the car body,
A coaxial connector connected to one end of the coaxial cable, connecting the antenna pattern and the inner conductor of the coaxial cable and connecting the ground pattern and the outer conductor of the coaxial cable;
A grounding coupling plate made of a metal plate that is attached to the vehicle body and has a protrusion that is brought into contact with the ground pattern;
A glass antenna for an automobile, comprising: While the antenna pattern and the ground pattern are made of a conductor, the ground pattern is disposed along the periphery of the glass,
The coupling plate is L-shaped, the tip of one side thereof is attached to the vehicle body on the periphery of the glass and the other side is disposed on the ground pattern side of the glass surface, and protrudes from the inner surface of the other side. The glass antenna for an automobile according to claim 1, wherein a tip of the protrusion is in contact with the ground pattern.

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