JP3491808B2 - Glass antenna for automobile - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass antenna provided on a side window glass for a vehicle such as an automobile, and more particularly to an F antenna.
The present invention relates to a glass antenna suitable for receiving radio waves of M radio broadcast waves and AM radio broadcast waves.

[0002]

2. Description of the Related Art Conventionally, as a glass antenna for a vehicle, an antenna provided in an upper margin portion or a lower margin portion of a conductive wire for heating a rear window glass and an antenna provided with a filament antenna in a front window glass have been used. It is known and has been put to practical use, but in the former case, since the space is originally small and there is a risk of obstructing the field of view, the antenna occupying area becomes small and sufficient reception gain is not always obtained. There wasn't.

Further, the latter antenna provided on the front window glass has a relatively high reception gain, but has a restriction on the mounting place more than the rear window glass so as not to hinder the driver's view.
Therefore, the antenna provided on the side window glass has been attracting attention due to the widespread use of RVs and the like, which have almost no such restrictions and have a relatively large area side window glass. 61509, JP-A-61-265
Many applications such as 904 have also been filed.

[0004]

However, most of the proposals relate to antennas for receiving TV broadcast waves, and few proposals have been made for antennas for receiving FM radio broadcast waves and AM radio broadcast waves.

In particular, in the case of RV vehicles, the rear window glass can be opened and closed in many cases, and even if it is a type that does not open and close, the size of the rear window glass is small and the mounting angle is close to vertical, so that it is heated for anti-fogging The area occupied by the antenna in the upper or lower margin of the wire is small, and even if an antenna wire is provided in this area, sufficient reception gain cannot be obtained. Especially, AM radio broadcast waves and FM radio broadcasts with low reception frequencies This is remarkable in the case of an antenna wire for receiving waves. In recent years, there has been a demand for an antenna for receiving a radio broadcast provided on a side window glass, but a proposal has hardly been made. .

Moreover, when a method of providing a plurality of antennas and receiving by switching to one with a higher reception gain when receiving radio waves in the ultra-high frequency band such as FM radio broadcast waves, the gain of a single antenna is set in the direction of the gain. It was possible to use a strong directional pattern with a dip.
The reality is that such a diversity antenna cannot be put to practical use without diversity reception.

The present invention has been made in view of the above circumstances, and by improving the directional characteristics, not only can FM radio broadcast waves be suitably received, but also AM radio broadcast wave radio waves can be received alone. An object of the present invention is to provide a glass antenna in which an antenna wire that can be used is effectively arranged on a side window glass.

[0008]

In order to solve the above-mentioned problems, the structure of claim 1 of the present invention has a glass antenna for an automobile, in which a plurality of conductive wires are arranged on a side window glass for a vehicle. In the first side of the four sides of the window glass, the first conductive wire extending from the power supply portion disposed on any one of the four sides of the window glass to the substantially central portion along the side, and the window glass connected to the first conductive wire. Of the second conductive wire that extends to almost the central portion of the second conductive line, and a third conductive line that is connected to the second conductive wire and that extends to approximately the central portion of the second side that is one of the sides adjacent to the first side. A line and a fourth conductive line connected to the third conductive line and extending toward a corner of the second side toward a third side facing the first side; and a fourth conductive line A fifth conductive wire that is connected to the strip and extends along the third side facing the first side to approximately the center of the side, and a fifth conductive wire. A sixth conductive wire that is connected to the wire and extends to almost the center of the window glass, and a seventh wire that is connected to the sixth wire and extends to about the center of the fourth side that faces the second side. Connected to the seventh conductive line and the eighth conductive line and extending to either corner along the fourth side.
At least conductive lines, all of the conductive lines are formed by one conductive line, and the conductive lines are formed along a plurality of sides.
From the line that extends to the center and almost the center of the sides
Conductive wire that extends almost in the center of the window glass, and from the center
Combine conductive wires that extend to the center of either side,
FM which has improved the directional characteristics for the FM radio broadcast wave
Suitable for receiving radio waves of radio broadcast waves and AM radio broadcast waves
It is a suitable glass antenna for automobiles .

According to a second aspect of the present invention, the first conductive wire is removed from the configuration according to the first aspect, and the power feeding portion is arranged in the central portion of any one side, and the second conductive wire is provided. The first conductive wire to the eighth conductive wire have the same configuration as that of the first conductive wire to the eighth conductive wire starting from the linear wire to the eighth conductive wire. lower down, multiple repeat a conductive filament
Lines and multiple sides that extend along the sides of the
Conductive wire extending from approximately the center of the window to approximately the center of the window glass
And a conductive wire extending from the central part to the central part of either side
By combining the features, the direction characteristics of FM radio waves
Of FM and AM radio broadcast waves with improved performance
It is a glass antenna for automobiles suitable for receiving waves.
It

According to a third aspect of the present invention, in the configuration according to the first aspect, further, between the first conductive wire and the power feeding section,
The structure is such that a conductive wire is added to an adjacent side to feed power from this conductive wire, and a wire corresponding to the eighth conductive wire is not necessarily required. In the case of reference numerals, the added conductive wire is the first conductive wire, and the first conductive wire to the seventh conductive wire in claim 1 are the second conductive wire to the eighth conductive wire. And a line that extends along multiple sides to almost the center of the line
Extends from approximately the center of multiple sides to approximately the center of the window glass
Conductive wire that extends from the center to either side of the center
Combined with the conductive wires that are used for FM radio wave
FM radio broadcast wave and AM radio with improved directional characteristics
A glass antenna for automobiles suitable for receiving transmitted radio waves
It's na.

Further, a U-shaped folded portion connecting the ends of the two parallel wires may be inserted into a part of the feeding portion or the antenna. Further, all the conductive wires may be formed by one conductive wire, or all or part of the conductive wires may be formed by two or more conductive wires.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The power feeding portion, which is the starting point of the antenna of the present invention, may be provided on any of the four sides of the side window glass. It may be a corner portion of the side as shown in FIG. 3, a central portion of the side as shown in the third embodiment, or a corner and a central portion of the side as shown in the second and fourth embodiments, and may be appropriately selected depending on the vehicle type. Good.

With respect to the structure of the antenna, the structure shown in claim 1 is a case where the feeding portion is arranged not at the central portion of any side but at the corner portion or between the corner portions, The first conductive wire is a wire that extends to the center of the side (first side), and is hereinafter connected to the first conductive wire and extends to almost the center of the window glass. Line, a third conductive line connected to the second conductive line, and extending to almost the center of the second side, which is one of the sides adjacent to the first side, and the third conductive line. Connected to the article, the second
To the corner of the side of the fourth conductive wire that extends toward the third side facing the first side, and to the third side that is connected to the fourth conductive wire and that faces the first side. A fifth conductive wire strip extending along substantially the center of the side, a sixth conductive wire strip connected to the fifth conductive wire and extending up to the substantially central part of the window glass, and a sixth conductive wire strip. A seventh conductive wire that is connected and extends to approximately the center of the fourth side that faces the second side, and to a corner that is connected to the seventh conductive wire and that extends along the fourth side. At least an eighth conductive wire extending
Then, all of the conductive wires are formed by one conductive wire .

According to a second aspect of the present invention, the power feeding portion is arranged at the center of any one of the sides, and the second conductive wire to the seventh conductive wire of the first aspect are arranged. It has the same structure as, and is referred to as a first conductive wire to a seventh conductive wire.

According to a third aspect of the present invention, in the structure according to the first aspect, a conductive wire is further added to an adjacent side between the first conductive wire and the power feeding portion, and power is fed from this conductive wire. In addition to the structure described above, the corresponding conductive strip corresponding to the eighth conductive strip is not necessarily required. In this case, the added conductive strip is used as the first conductive strip. The first conductive wire to the seventh conductive wire in claim 1 are referred to as the second conductive wire to the eighth conductive wire.

In any case, it is preferable that the conductive wire extending along each side is arranged at least 10 mm away from the body so that the receiving gain does not decrease due to the influence of the metal body.

In the antenna according to the present invention, the linear strip thus extending along the plurality of sides to the substantially central portion thereof, the conductive strip extending from the substantially central portion of the plurality of sides to the substantially central portion of the window glass, and the central portion. From the side to the center of any of the sides, by combining the upper and lower sides and one of the three horizontal lines provided in the center with one side of the vertical line to form an E-shape Since the entire surface of the glass can be effectively used as compared to the pattern of No. 1 or the pattern of making one round all around, it is possible to further increase the reception gain for AM radio broadcast waves and FM radio broadcast waves. Further, since the receiving area of the antenna can be increased by forming a part or all of the conductive wires in a doubled manner, it is possible to improve the receiving gain for the AM radio broadcast wave. It can be.

Further, in particular, in order to improve the reception gain for FM radio broadcast waves or to improve the directivity characteristics,
Or to adjust the impedance, a horizontal line,
Vertical stripes, or L-shaped combination of these, T
It is possible to add various auxiliary elements such as letter shape and U shape. When receiving FM radio broadcast wave, AM radio broadcast wave, long wave or short wave, add impedance matching circuit, preamplifier circuit etc. as external circuit. May be.

Further, the antenna of the present invention can be provided independently on either the left or right side window glass to receive independently when receiving AM radio broadcast waves or FM radio broadcast waves, but when receiving FM radio broadcast waves. A glass antenna for receiving FM radio broadcast waves provided on the other side window glass (an antenna having the configuration of the present invention is preferable, but glass antennas having other configurations may of course be used), or an FM radio provided on the rear window glass. Of course, diversity reception may be performed in combination with a glass antenna for receiving broadcast waves, a glass antenna provided on the front window glass, a hop antenna, or the like.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. 1 to 4 are front views of the antennas of Examples 1 to 4 mounted on one side windowpane as seen from the outside of the vehicle, and FIGS.
It is a directional characteristic figure in 4 MHz.

Embodiment 1 This is an example corresponding to claim 1 and in which the first side is the left side,
As shown in FIG. 1, on a vehicle interior surface of a glass sheet 1 mounted on one side window glass for a vehicle, a power feeding portion 2 and a left side which is a first side from the power feeding portion 2 A first conductive wire strip 31 having a length of 150 mm extending to the center of the side;
A second conductive wire 32 having a length of 270 mm which is connected to the first conductive wire and extends to approximately the center of the window glass;
And a third conductive wire 33 having a length of 180 mm that is connected to the conductive wire and extends to almost the center of the side adjacent to the first side (the lower side in this example). Connected to the fourth conductive wire strip 34 having a length of 270 mm extending toward the third side (right side) facing the first side up to almost the corners along the lower side. The fifth conductive wire 35 having a length of 180 mm that extends along the third side (right side) opposite to the first side to almost the center of the side.
And a sixth conductive wire 36 having a length of 250 mm connected to the fifth conductive wire and extending to almost the central portion of the window glass, and connected to the sixth conductive wire and facing the second side. The seventh conductive wire strip 37 having a length of 180 mm extending to almost the center of the fourth side (upper side) and the third conductive line strip 37 connected to the seventh conductive line strip up to the corner along the fourth side (upper side) Of the glass antenna 3 for receiving the AM radio broadcast wave and the FM radio broadcast wave according to the present invention, which is composed of the eighth conductive wire strip having a length of 230 mm, which extends toward the side (right side) of the glass screen before bending. Then, it is formed by firing at the same time as bending.

The dimensions of the plate glass 1 thus obtained are A = 630 mm, A ′ = 630 mm and B = 450 m.
m, B '= 430 mm, installed on the side window glass of an automobile, which is almost the center of the domestic FM radio broadcasting wave band 84
When radio waves in the FM radio band of MHz were received and their directional characteristics were measured, the results are as shown in FIG.

As is clear from this result, there is almost no drop (dip) in the reception gain due to the difference in the arrival direction of the radio waves, and it is clear that the directional characteristic is extremely good. In addition, the radio waves in the AM radio band of 530 KHz to 1600 KHz are received by the antenna 3'installed on the other window glass, and a conductive wire strip is provided around the window glass from the corner power feeding section to the side window glass of approximately the same size. Compared with an antenna that makes almost one turn (hereinafter referred to as a comparative example), it is improved by about 2 dB over almost the entire area, and it can be seen that this is a good antenna.

Example 2 to Example 4 Example 2 shown in FIG. 2 corresponds to claim 1 and claim 5 , and the sixth conductive wire and the seventh conductive wire are two conductive wires. This is an example in which an auxiliary element is added while being formed.

The antenna 3 has a length of 80 extending from the feeding portion 2 along the left side which is the first side to the center of the side.
mm first conductive wire 31 and a length of 250 mm connected to the first conductive wire and extending to almost the center of the window glass
Connected to the second conductive wire 32 of
A third conductive wire strip 33 having a length of 180 mm and extending to almost the center of a side adjacent to the first side (lower side in this example);
A fourth conductive wire 34 connected to the third conductive wire and having a length of 300 mm extending along the lower side toward the third side (right side) facing the first side to almost the corner, A length of 1 along a third side (right side) that is connected to the fourth conductive wire and faces the first side, and extends to almost the center of the side.
The 80 mm fifth conductive wire 35 and a length of 280 m connected to the fifth conductive wire 35 and extending to almost the center of the window glass
The length of 180 mm and the length of 160 mm which are connected to the sixth conductive wire 36 of m and the fourth side (upper side) which is connected to the sixth conductive wire and which faces the second side and which extends to almost the center The 7th
Conductive wire 37, 37 'and the seventh conductive wire 37, 37'
And an eighth conductive wire 38, 38 'having a length of 270 mm and a length of 250 mm extending along the fourth side (upper side) to the corner toward the third side (right side). As shown in the figure, the basic conductive wire has a length of 60 m.
Inverted L-shaped auxiliary element 4 consisting of a vertical filament of m and a horizontal filament of 170 mm and a length of 180 mm
The auxiliary element 5 and the auxiliary element 6 having a length of 60 mm are added, and the other configurations such as the size of the plate glass are the same as those in the first embodiment.

The third embodiment shown in FIG. 3 is defined by claims 2 and 3.
5) , the first side is the lower side, the first conductive wire to the sixth conductive wire are double-formed, and the seventh conductive wire is separately arranged and further extended. Filaments 38, 38 ',
The auxiliary element 7 is added.

The antenna 3 has a length of 140 mm and a length of 160 mm of the first conductive wire 3 extending from the feeding portion 2 arranged at the center of the lower side, which is the first side, to almost the center of the window glass.
No. 1, 31 'and a second conductive wire having a length of 270 mm and 270 mm that is connected to the first conductive wire and extends to almost the center of a side adjacent to the first side (left side in this example). Three
2, 32 ', and second lengths of 220 mm and 180 mm which are connected to the second conductive wire and extend to the third side (upper side) facing the first side along the left side to almost the corner. The third conductive wire 33, 33 'and the third conductive wire are connected to the third conductive wire, and the length extending along the third side (upper side) facing the first side to almost the center of the side is 290mm and 250
mm of the fourth conductive wire 34, 34 'and a length of 16 connected to the fourth conductive wire and extending to almost the center of the window glass.
0 mm and 160 mm fifth conductive wire 35, 35 ',
The length is 250 mm, which is connected to the fifth conductive wire and extends to almost the center of the fourth side (right side) facing the second side.
And a sixth conductive wire 36, 36 'of 270 mm, and a seventh conductive wire 37 of length 160 mm connected to the sixth conductive wire 36 and extending along the fourth side to the upper right corner,
A seventh conductive wire strip 37 'having a length of 180 mm which is connected to the sixth conductive wire strip 36' and extends along the fourth side to the lower right corner is used as a basic configuration. The extension wire 38 having a length of 200 mm and the extension wire 38 ′ having a length of 180 mm connected to the seventh conductive wire 37 ′, respectively, and the length of 120 mm as shown in the figure. The auxiliary element 7 is added.

Example 4 shown in FIG. 4 is an example corresponding to claim 3, claim 4 and claim 5 , in which the first side is the right side and the fifth conductive line to the eighth conductive line. The double line is formed up to the line, the extension lines are connected to each line, and the U-shaped folded portion 3A connecting the ends of the two parallel lines is inserted into a part of the antenna. Is added.

The antenna 3 includes a first conductive wire strip 31 extending from the power feeding portion 2 disposed on the right side which is the first side to almost any corner along the side, and a first conductive wire strip. Connected to the second side strip 32 extending to the central portion along the second side adjacent to the first side, the folded portion 3A connected to the second conductive line, and the folded portion 3A. , A third conductive wire 33 extending to almost the center of the window glass, and a fourth conductive wire connected to the third conductive wire and extending to almost the center of the side (left side) facing the first side. A line 34 and two fifth conductive lines 35, 35 'connected to the fourth conductive line and extending along the first side to the upper left corner portion;
Two sixth conductive wire strips 36, 36 'and a sixth conductive wire connected to the fifth conductive wire strip and extending to the central portion along a fourth side (upper side) opposite to the second side Two seventh conductive wire strips 37, 37 'connected to the strip and extending to the center of the window glass
And an extension line that is connected to the seventh conductive wire and has two basic conductive wires that extend to the center of the first side (right side) and that is further connected to the eighth conductive wire. Article 39, 39 '
And the auxiliary element 8 arranged along the first conductive wire strip 31 and the second conductive wire strip 32 is added.

The glass antennas 3 of Examples 2 to 4 obtained in this way also have the same level of reception performance for FM radio broadcast waves as the antenna 3 of Example 1, etc. It was confirmed that both had better reception performance than that of Example 1 with respect to broadcast waves.

[0031]

As described above, even if the glass antenna of the present invention is an antenna provided on a side window glass,
Not only can FM radio broadcast waves and AM radio broadcast waves be received with a high gain, but especially for FM radio broadcast waves, their directional characteristics are nearly omnidirectional and can be received independently.

[Brief description of drawings]

FIG. 1 is a front view of the antenna according to the first embodiment provided on one side window glass as viewed from outside the vehicle.

FIG. 2 is a front view showing a second embodiment in which the glass antenna of the present invention is provided on one side window glass for an automobile.

FIG. 3 is a front view showing a third embodiment in which the glass antenna of the present invention is provided on one side window glass for an automobile.

FIG. 4 is a front view showing a fourth embodiment in which the glass antenna of the present invention is provided on one side window glass for an automobile.

FIG. 5 is a directional characteristic diagram when an 84 MHz radio wave in the FM radio band is received by the antenna in the first embodiment.

[Explanation of symbols]

1 plate glass 2 power supply 3 Glass antenna of the present invention 4-9 Auxiliary element

Continuation of the front page (56) Reference JP-A-8-265029 (JP, A) Actual development 2-811 (JP, U) JP 61-42443 (JP, B1) JP 1-57843 (JP , B2) Japanese Patent Publication No. 3-63843 (JP, B2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01Q 1/32

Claims (5)

(57) [Claims] Claim: What is claimed is: 1. A glass antenna for an automobile, wherein a plurality of conductive wire strips are arranged on a side window glass for a vehicle.
A first conductive wire extending from a power feeding portion disposed on one of the first sides to almost the central portion along the side, and to a substantially central portion of the window glass connected to the first conductive wire. A second conductive wire extending and a third wire connected to the second conductive wire and extending to substantially the center of the second side, which is one of the sides adjacent to the first side. , A third conductor connected to the third conductive line and facing the first side up to the corner of the second side
Conductive line extending toward the side of the first conductive line, and a fifth conductive line connected to the fourth conductive line and extending along the third side facing the first side to substantially the center of the side. A wire strip and a sixth wire connected to the fifth conductive wire and extending to almost the center of the window glass
Connected to the sixth conductive wire and the seventh conductive wire that extends to almost the central portion of the fourth side opposite to the second side and the seventh conductive wire. At least an eighth conductive wire extending along either of the fourth sides to almost any corner is provided, all of the conductive wires are formed by one conductive wire, and the conductive wire is formed along a plurality of sides. Extending to its center
From the center of the line and multiple sides to the center of the window glass
Part of the conductive wire that extends from the center to either side of the center
Combined with the conductive wire extending to the FM radio broadcast wave
On the other hand , the FM laser characterized by improving its directional characteristics
Suitable for receiving radio waves of Geo broadcast wave and AM radio broadcast wave
Glass antenna for various automobiles. 2. A glass antenna for an automobile, wherein a plurality of conductive wire strips are arranged on a side window glass for a vehicle.
A first conductive wire extending from a power feeding portion disposed substantially in the center of any one of the sides to a substantially center of the window glass, and connected to the first conductive wire, and the first side A second side extending to almost the center of the second side, which is one of the sides adjacent to
And a third conductive wire that is connected to the second conductive wire and extends toward the third side facing the first side to the corner of the second side, A fourth conductive wire that is connected to the conductive wire and extends along a third side facing the first side to approximately the center of the side, and a window glass that is connected to the fourth conductive wire and that is connected to the fourth conductive wire. A fifth conductive wire extending to the center,
A sixth conductive wire connected to the fifth conductive wire and extending to almost the center of the fourth side facing the second side, and a sixth conductive wire connected to the sixth conductive line and connected to the fourth side. At least a seventh conductive strip extending substantially to either corner, all of said conductive strips being formed by a single conductive strip.
And a line that extends along multiple edges to approximately its center.
Extends from approximately the center of multiple sides to approximately the center of the window glass
Conductive wire that extends from the center to either side of the center
Combined with the conductive wires that are used for FM radio wave
FM radio broadcasting characterized by improving the directional characteristics of
Glass antenna for automobiles, which is suitable for receiving radio waves of radio waves and AM radio broadcast waves . 3. A glass antenna for an automobile, wherein a plurality of conductive wire strips are provided on a side window glass for a vehicle.
A first conductive wire extending from a power supply unit disposed on any one of the first sides to almost any corner along the side, and the first conductive wire connected to the first conductive wire, A second conductive wire extending to the central portion along a second side adjacent to
A third conductive wire that is connected to the second conductive wire and extends to almost the center of the window glass, and a third wire that is connected to the third conductive wire and that faces the first side or the first side. A fourth conductive wire extending to almost the center of the side, and a fifth conductive wire connected to the fourth conductive wire and extending to a corner of the first side or a side opposite to the first side. , A sixth conductive wire connected to the fifth conductive wire and extending to a central portion along a fourth side opposite to the second side, and a sixth conductive wire connected to the sixth conductive wire. A seventh conductive wire extending almost to the center,
And at least an eighth conductive wire extending to the central portion of the third side or the first side.
All of the conductive wires are formed by one conductive wire ,
A plurality of filaments that extend along multiple sides to approximately the center of the line
Guides extending from almost the center of the side of the window to the center of the window glass.
Wire conductors and conductors that extend from the center to either side of the center
Combining electrical wires, the fingers for FM radio waves
FM radio broadcast waves characterized by improved directional characteristics
A glass antenna for automobiles suitable for receiving radio waves of AM radio broadcast waves . 4. The U-shaped folded portion connecting the ends of the parallel two wires is inserted into a part of the feeding portion or the antenna, according to any one of claims 1 to 3. The radio waves of the FM radio broadcast wave and AM radio broadcast wave described
A glass antenna for automobiles suitable for receiving . 5. The FM radio broadcast wave and A according to claim 1, wherein at least one of the conductive wires is formed by a plurality of conductive wires.
Glass antenna for automobiles suitable for receiving radio waves of M radio broadcast waves .