JPH11284421A - On-glass antenna for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the impedance of the antenna by placing a loop element to an upper or lower space of a defogger, connecting directly the ele ment to part of the defogger and feeding the antenna via this element. SOLUTION: A defogger consisting of a heating conductor wire 2 and bus bars 3, 3', a loop element 4 consisting of horizontal and vertical wires connecting both ends to each other, and a feeding section 5 are all formed on an inner face of a plate glass 1 as a vehicle rear window glass. Furthermore, conductor wires connecting the loop element 4 to the bus bar 3, conductor wires connecting the feed section to the loop element and feed sections for antennas 6, 7, 8, 9, 10 are respectively formed by printing and baking with conductive paste. The reception gain with respect to FM radio broadcasting waves and TV broadcasting waves is improved by the use of this antenna and the antenna can also receive AM radio broadcasting waves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AM radio wave, an FM radio wave, etc.
The present invention relates to a glass antenna for receiving TV broadcast waves and the like, and particularly to a glass antenna suitable for receiving FM radio broadcast waves and TV radio broadcast waves.

[0002]

2. Description of the Related Art Conventionally, as a glass antenna for a vehicle, an antenna provided on a rear window glass is generally employed because if it is provided on a front window glass, it obstructs the view of a driver or the like. In recent years, there have been many applications using a heating conductive wire (defogger) as an antenna for a glass antenna for FM radio broadcast waves and an antenna for TV broadcast waves as Japanese Utility Model Publication No. 2-7791 and Japanese Patent Application Laid-Open No. Hei 7-263933. Filed.

[0003] Among them, an antenna in which a conductive wire is orthogonally connected to a conductive wire for heating and used as an antenna, a part of an antenna provided in an upper margin portion of the conductive wire for heating is partially connected to the conductive wire for heating. Japanese Patent Application Laid-Open No. 56-424, orthogonal to and connected to the filament
No. 01 is known, and as an antenna provided with a vertical wire extending outside the heating conductive wire (bus bar),
The present applicant has also proposed an antenna consisting of a short and horizontally extending wire from the tip of a wire extending vertically along the bus bar to the upper margin of the conductive wire for heating, as disclosed in Japanese Patent Application No. 60-262690 (Japanese Patent Application Laid-Open No. 62-123803). And Japanese Patent Application No. 1-220238 (JP-A-3-85004).

[0004]

However, in any case, the receiving sensitivity and impedance of the antenna tend to be determined by the size of the heating conductive wire occupying most of the rear window glass. And it was difficult to further increase the receiving sensitivity.

The antenna disclosed in Japanese Patent Application No. Sho 60-262690 has a small occupied area, but in this case also, the antenna is high for radio waves over an extremely wide band from AM radio broadcast waves to TV broadcast waves. It was difficult to gain.

[0006] The present invention has been made in view of such a point, and when the defogger is used as an antenna, the impedance can be easily adjusted, and as a result, especially for FM radio broadcast waves and TV broadcast waves. It is an object of the present invention to provide a glass antenna capable of improving reception gain and receiving AM radio broadcast waves.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of conductive wires for heating disposed on a rear window glass for a vehicle and a plurality of conductive wires for heating outside the window. In a glass antenna for a vehicle using a defogger composed of an arranged bus bar as an antenna, a loop element is disposed in an upper or lower margin of the defogger,
This element is directly connected to a part of the defogger, and power is supplied from the element.

Further, an auxiliary element may be added to a part of the defogger, or an auxiliary element may be added to a conductive wire connecting the defogger and the loop element or a conductive wire connecting the loop element and the power supply portion.

According to the present invention, a loop element such as a square having both ends of a parallel horizontal line connected to a vertical line is connected between a defogger and a power supply portion, and the length of two horizontal lines of the element is set. By changing the interval between the horizontal lines, the impedance can be adjusted within a larger range than when power is supplied directly from the defogger when receiving FM radio broadcast waves or TV broadcast waves, and as a result, the reception sensitivity is improved. Can be.

This loop element has a length of 200 mm to 600 mm and an interval of 10 mm, depending on the type of vehicle.
The impedance can be adjusted within a range of up to 60 mm, so that the occupied area is relatively small. Even if another antenna is provided in the upper margin as well as in the lower corner, it is provided in the upper margin. be able to.

To simply adjust the impedance, a U-shaped element in which one end of two horizontal wires is connected by a vertical wire is inserted between the defogger and the feeding portion, and the length of the horizontal wire is adjusted. Although it is possible to some extent by changing the interval between the horizontal streaks, the rectangular loop element of the present invention can improve the receiving sensitivity more than this element.

[0012] It is considered that the reason is that the rectangular loop element or the like not only performs the function of adjusting the impedance but also functions as an antenna to improve the reception gain.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The loop element of the present invention is preferably a rectangular shape composed of two horizontal filaments and a vertical filament connecting both ends as a horizontally elongated rectangular shape, and the length of the two horizontal filaments is 200 mm. In the range of ~ 600 mm, the interval between the two horizontal streaks is in the range of 10 mm ~ 60 mm, which may be appropriately selected according to the type of vehicle, but the shape is not limited to a square shape, but a triangular shape, and each straight line is a curve. What formed,
Various loop elements such as an elliptical shape can also be employed.

The loop element itself is preferably arranged at a corner on the upper side or the lower side, but may be arranged closer to the center than in each embodiment. In addition, the draw-out point from the defogger to the loop element may be drawn not only from the bus bar but also from a part of the lowermost or uppermost conductive wire for heating. As shown in the first to third embodiments, the drawer may be a quadrangular vertex, but may be a part of the upper and lower horizontal stripes as shown in the fourth embodiment.

In any case, the distance between the heating conductive wire and one of the adjacent horizontal wires of the loop element may be in the range of 5 mm to 50 mm. The auxiliary element is not necessarily required, but the auxiliary element connected to the defogger (heating conductive wire or bus bar) can change the receiving frequency band, and is very effective depending on the vehicle type.

The impedance may be adjusted by adding an auxiliary element connected to a conductive line connecting the defogger and the loop element or a conductive line connecting the loop element and the power supply unit.

Although the antenna of the present invention can be used alone, other antennas provided on the rear window glass, antennas provided on the front window glass, antennas provided on the side window glass, whip antennas, and the like can be used. Of course, diversity reception may be performed in combination with a pole antenna or the like.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. 1 to 4 show Embodiments 1 to 4 in which the glass antenna of the present invention is provided on a rear window glass for an automobile, respectively.
FIG.

Embodiment 1 A case is described in which a loop element is arranged on the lower side and diversity reception is performed with other antennas provided in an upper margin portion and a lower margin portion of a conductive wire for heating.

As shown in FIG. 1, a heating wire is provided on the inner surface of a glass sheet 1 (upper side length 1100 mm, lower side length 1300 mm, side vertical length 800 mm) mounted on a rear window glass for a vehicle. Defogger consisting of strips 2, 2, ... 2, busbars 3, 3 ', length 500m
a loop element 4, a power supply unit 5, and a conductive wire connecting the loop element and the bus bar, each of which is composed of two horizontal wires of m and 520 mm and vertical wires of 20 mm and 21 mm connecting both ends thereof. ), A conductive line (symbol omitted) for connecting the loop element connecting the feeder and the loop element, an FM broadcast wave receiving antenna 6 disposed in an upper margin of the heating conductive line, and a TV broadcast wave receiving The antenna 7 for receiving the TV broadcast, the antenna 8 for receiving the TV broadcast, the antenna 9 for receiving the TV broadcast arranged in the lower margin of the conductive wire for heating, and the antenna 10 for receiving the FM broadcast wave, It is formed by printing and baking with a conductive paste.

The glazing thus obtained is mounted on the rear window glass of an automobile, and the defogger antenna of the present invention is used to transmit 76 MHz to 90 MHz FM broadcast waves.
TV broadcast wave band (VHF-LOW band) of 1 to 3 channels of MHz to 108 MHz, 170 MHz to 222 MHz
4-12 channel TV broadcast wave (VHF-HIGH
Band) is received from the feeder 5 and the gain difference (hereinafter abbreviated as dipole ratio) when the reception gain of the standard dipole antenna is set to 0 dB is -16.2 dB and -13. 8 dB and -13.3 dB, and the reception gains when the defogger without the conventional loop element is used as an antenna are respectively about -19 dB, about -15 dB, and about -16 in average.
Since it is dB, it can be seen that the reception gain is improved in each band.

A of 520 KHz to 1620 KHz
It has been confirmed that the radio waves in the M radio band can be suitably received.
In the present embodiment, when FM broadcast waves are actually received, diversity reception is performed by the antennas 6 and 10, and when a TV broadcast wave VHF-LOW band is received, TV broadcasts are performed by the defogger antenna and the antenna 8 of the present invention. When receiving the wave VHF-HIGH band, diversity reception is performed by the antenna 7 and the antenna 9 respectively. When the defogger antenna of the present invention receives the FM broadcast wave and the TV broadcast wave VHF-HIGH band, one of the diversity reception is performed. Of course, it can also be used as an antenna.

Embodiment 2 A case is described in which the loop element is arranged on the upper side, and diversity reception is performed with other antennas provided in the upper margin and lower margin of the conductive wire for heating.

As shown in FIG. 2, on a vehicle interior surface of a glass sheet 1 mounted on a rear window glass for a vehicle, heating conductive wires 2, 2,... A loop element 4 composed of two horizontal filaments having a length of 300 mm and 315 mm and a vertical filament having a length of 15 mm and 16 mm connecting both ends thereof; Reference numerals are omitted), conductive strips connecting the feeder and the loop element (reference numbers are omitted), an antenna 6 for receiving FM broadcast waves, and an antenna 7 for receiving TV broadcast waves arranged in an upper margin of the conductive strip for heating. , An antenna 8 for receiving a TV broadcast, an antenna 9 for receiving an FM broadcast, and a TV, which are arranged in a lower margin of the conductive wire for heating.
The broadcast wave receiving antenna 10 is formed by printing and baking the respective power supply units (reference numerals are omitted) with a conductive paste.

The plate glass thus obtained is mounted on a rear window glass of an automobile, and FM broadcast waves of 76 MHz to 90 MHz, TV broadcast waves of 1 to 3 channels of 90 MHz to 108 MHz (VHF-LOW band), 170MH
Gain differences (hereinafter abbreviated as dipole ratios) when TV broadcast waves (VHF-HIGH band) of 4 to 12 channels of z to 222 MHz are respectively received from the feeding unit 5 and the reception gain of the standard dipole antenna is set to 0 dB. ), -17.1 dB, -13.8 dB,
-13.3 dB, and the reception gains when the defogger without the conventional loop element is used as an antenna are respectively about -19 dB and about -1 as an average value.
Since it is 5 dB and about -16 dB, it can be seen that the reception gain is improved in each band.

In addition, A of 520 KHz to 1620 KHz
It has been confirmed that the radio waves in the M radio band can be suitably received.
In this embodiment, when FM broadcast waves are actually received, diversity reception is performed by the antennas 6 and 10, and when the TV broadcast wave VL band is received, the TV broadcast wave V
When receiving the −H band, diversity reception is performed by the antenna 7 and the antenna 9 respectively. However, the defogger antenna of the present invention uses the FM broadcast wave, the TV broadcast wave V
Of course, it can also be used when receiving the H band.

Embodiment 3 and Embodiment 4 Embodiment 3 shown in FIG. 3 is an L-port connected to a part of the defogger.
This is an example in which an auxiliary element 11 having a V-shape and an auxiliary element 12 composed of a horizontal line are added to a conductive line connecting the defogger and the loop element 4, and the fourth embodiment shown in FIG. This is an example in which the drawing from the loop element 4 to the power supply portion is part of the upper horizontal line of the loop element as the heating conductive line.

As in the first embodiment, it was confirmed that the defogger antenna obtained in this manner has an improved reception gain as compared with the case where there is no loop element.

[0029]

According to the present invention, when power is supplied directly from a defogger as in the prior art, it is difficult to adjust the impedance and the receiving gain may not be increased. However, according to the present invention, it is only necessary to easily adjust the impedance. Instead, by adding a loop element that also functions as an antenna, the reception gain can be improved according to the vehicle type.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment in which a glass antenna of the present invention is provided on a rear window glass for an automobile.

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet glass 2 conductive strip for heating 3, 3 ′ bus bar 4 loop element 5 feeder 6 to 10 other antennas 11, 12 auxiliary element

Claims (3)

[Claims] 1. A glass antenna for a vehicle, wherein a defogger comprising a plurality of conductive wires for heating provided on a rear window glass for a vehicle and a bus bar provided outside the conductive wires for heating is used as an antenna. A glass antenna for a vehicle, wherein a loop element is provided in an upper or lower margin of the defogger, and this element is directly connected to a part of the defogger, and power is supplied from the element. 2. A glass antenna for a vehicle according to claim 1, further comprising an auxiliary element connected to a part of the defogger. 3. The vehicle according to claim 1, further comprising an auxiliary element connected to a conductive wire connecting the defogger and the loop element or a conductive wire connecting the loop element and the power supply portion. Glass antenna.