JPH09181514A - Glass antenna for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass antenna which is capable of simultaneously receiving an FM radio broadcasting (sound information) and an FM character broadcasting (information except sound) without requiring a branching filter and has little loss in antenna reception gain. SOLUTION: On the upper blank part of the conductive wire 2 for heating a rear window glass for vehicle, two antennas 3, 4 are provided, and on the lower blank part, at least an antenna 5, 6 is provided. By the one antenna 3 of the upper blank part and the one antenna 5 provided on the lower blank part, a diversity reception is performed for the sound information on an FM broadcasting wave. By the other antenna 4 of the upper blank part and the other antenna 6 of the lower blank part or the antenna provided on an other place, the diversity reception is performed for the information except the sound of the FM broadcasting wave. Conversely, the diversity reception is performed for information except the sound of the FM broadcasting wave by the antenna 3 and the antenna 5. By the antenna 4 and the antenna 6 or the antenna provided on the other place, the diversity reception may be performed for the sound information on the FM broadcasting wave.

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 rear window glass of an automobile or the like for receiving audio information of FM radio broadcast waves and other information such as character information.

[0002]

2. Description of the Related Art In recent years, FM multiplex broadcasting has been put into practical use, in which not only FM radio broadcast waves dedicated to audio information but also audio information as analog signals and information other than voice such as text information as digital signals are put into practical use. Some receivers are equipped with both voice information and text information.

When such information is received by a glass antenna, there is no conventional dedicated antenna, but a radio receiving antenna receives it, and the demultiplexer demultiplexes it and inputs it to each tuner. The current situation.

[0004]

However, the method of receiving by demultiplexing with the demultiplexer requires the demultiplexer, which not only increases the cost, but also increases the reception gain of the antenna by the demultiplexer. There are losses and sometimes an amplifier is needed to make up for them.

The present invention has been made in view of the above circumstances, and it is possible to simultaneously receive an FM radio broadcast (voice information) and an FM text broadcast (information other than voice) without using a duplexer. It is an object of the present invention to provide a glass antenna that can be manufactured and has a small loss of reception gain.

[0006]

In order to solve the above-mentioned problems, the present invention provides two antennas in the upper margin of the heating conductive wire of the rear window glass for vehicles, and at least in the lower margin. One antenna is provided, and one antenna provided in the upper margin portion and one antenna provided in the lower margin portion receive the audio information of the FM broadcast wave by diversity reception, and the other antenna in the upper margin portion and the other antenna in the lower margin portion are received. F through the antenna or an antenna installed in another place
Diversity reception of information other than the sound of M broadcast waves, or conversely, diversity reception of information other than the sound of FM broadcast waves by one antenna of the upper margin part and one antenna provided in the lower margin part, and the upper margin Diversity reception of audio information of FM broadcast waves by the other antenna of the section and the other antenna of the lower margin or an antenna provided in another place, and the antenna for receiving the audio information and the character information other than the audio information Since the antennas for receiving the etc. are separated, the duplexer is of course unnecessary, and the audio information from the broadcasting station A that simultaneously transmits the audio information and the text information is heard and the text information from the broadcasting station is viewed. Of course, while watching the character information from the A broadcasting station that is transmitting the voice information and the character information at the same time, another voice information and the character information can be simultaneously processed. You can listen to audio information from the B broadcasting station transmitting only or audio information is signal.

Further, the antenna occupying area of the upper portion of the heating conductive wire strip is larger than that of the lower portion of the rear window glass, the side window glass, and the like, and since the position is high and the effective height is high, it is larger than the TV broadcast wave. FM that requires an occupied area
It is suitable for receiving broadcasts, and therefore, two antennas for receiving FM broadcasts are provided in the upper margin part, and these two antennas have similar characteristics in reception gain and directivity to FM broadcast waves. Therefore, although this antenna receives the same FM broadcast wave, it is divided into voice information and information other than voice, and diversity reception is performed with an antenna provided in a lower margin portion having a different directional characteristic or an antenna provided in another place. The effect of can be expected.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The two antennas provided in the upper margin of the heating conductive wire of the rear window glass for a vehicle need the length of the horizontal wire, so one side edge of the glass to the other In order to effectively use the length up to the side edge, the horizontal length is ensured by dividing the upper and lower parts into two instead of dividing the left and right parts into two.

The number of antennas provided in the lower margin of the heating conductive wire may be one or two, and when two antennas are provided, they may be separately arranged on the left and right. In one case, it is necessary to provide an antenna provided in another place, a whip antenna, a pillar antenna, or a glass antenna provided in another windshield or side glass.

Regarding diversity reception, the antenna information of the FM broadcast wave is diversity-received by one antenna in the upper margin portion and one antenna provided in the lower margin portion,
The other antenna of the upper margin and the other antenna of the lower margin or an antenna provided in another place receives information other than the voice of the FM broadcast wave, such as character information, for diversity reception, or conversely, one of the upper margins. Information other than the audio information of the FM broadcast wave is diversity-received by the above antenna and one antenna provided in the lower margin, and the other antenna in the upper margin and the other antenna in the lower margin are provided or in another place. Therefore, the voice information of the FM teletext may be received by diversity.

The glass antenna of the present invention is preferably formed by printing and firing a silver paste because it is easy to feed power, but when the rear window glass is laminated glass, a copper wire or the like is formed on the intermediate film. It may be formed by embedding the thin metal wire.

[0012]

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.
FIGS. 5 to 8 are directional characteristic diagrams of 84 MHz when an FM broadcast wave is received by the glass antenna according to the first embodiment. One antenna of the upper margin portion and the other antenna of the upper margin portion are respectively shown. , One antenna of the lower margin, and the other antenna.

Embodiment 1 An antenna will be exemplified in which there is no pole antenna such as a whip antenna and only a glass antenna is used to receive FM broadcast waves and AM radio broadcast waves.

As shown in FIG. 1, on the inside surface of a glass sheet 1 mounted on a rear window glass for a vehicle, there are heating conductive wires 2, 2, ... A book provided with an antenna 3 (feeding portion 3 ₁ ), the other antenna 4 (feeding portion 4 ₁ ), and one antenna 5 (feeding portion 5 ₁ ) and the other antenna 6 (feeding portion 6 ₁ ) in the lower margin. The glass antenna of the invention is formed by printing and firing with a silver paste.

The plate glass thus obtained is mounted on a rear window glass of an automobile, and an FM broadcast wave of 76 MHz to 90 MHz is received by the antenna of the present invention.
Expressed as a gain difference (hereinafter, abbreviated as dipole ratio) when the reception gain of a standard dipole antenna is 0 dB, one antenna 3 in the upper margin and the other antenna 4 are -18.3 dB on average, respectively. -18.9 dB, the one antenna 5 and the other antenna 6 in the lower blank portion are -20.5 dB and -21.3 dB, respectively, and the directional characteristics of the respective antennas are shown in FIGS. 5, 6, 7, and 8.
It became as shown in.

As is clear from these results, the antennas 3 and 4 in the upper margin have similar average reception gains and directivity characteristics, and the antennas 5 and 6 in the lower margin also have average reception gain and directivity characteristics. , And the directional characteristics of the antenna in the upper margin are slightly dip (reception gain drop) before and after the direction of travel of the car, while the antenna in the lower margin is Since it is located approximately 90 degrees away from the traveling direction, the antenna information of the FM broadcast wave is diversity-received by the antenna 3 of the upper margin portion and the antenna 5 of the lower margin portion, and the antenna 4 of the upper margin portion and the lower margin portion are received. Diversity reception of character information of FM broadcast waves by the antenna 6 is preferable because it complements each other's dips.

The antennas 3 and 5 may receive the character information and the antennas 4 and 6 may receive the voice information. Of course, the antennas 3 and 6 receive the character information or the voice information, and the antennas Voice information or text information may be received by the antenna 4 and the antenna 5.

Further, in the antenna having such a structure, the AM radio broadcast can be received by the antenna 3, and a pole antenna such as a whip antenna is unnecessary. Example 2 This is an example in which a whip antenna (not shown) is provided and this antenna is also one of the antennas for diversity reception when receiving FM broadcast waves.

The antennas 3 (feeding portion 3 ₁ ) and 4 (feeding portion 4 ₁ ) in the upper margin portion and the antenna 5 (feeding portion 5 ₁ ) in the lower margin portion are all patterns suitable for receiving FM broadcast waves. It is formed by printing and firing a silver paste as in Example 1, and the antennas 3 and 4 in the upper margin part are formed.
Is similar to the antennas 3 and 4 of the first embodiment in average reception gain and directional characteristics, and the antenna 5 in the lower margin is the first embodiment.
It was confirmed that the average reception gain and the directional characteristics are similar to the antennas 5 and 6 of.

When receiving the audio information of the FM broadcast wave with such an antenna, diversity reception is performed by the antenna 3 in the upper margin and the antenna 5 in the lower margin or the whip antenna, or the antenna 4 and the whip antenna or the antenna 5. Diversity reception can be performed by, and when receiving text information, an antenna that does not perform diversity reception of voice information,
That is, diversity reception may be performed by the antenna in the upper margin and the antenna in the lower margin or the whip antenna.

In this case, the AM radio broadcast wave can be received by the whip antenna. Example 3 An example of an antenna that receives a TV broadcast wave in addition to an FM broadcast wave and an AM radio broadcast wave by using only a glass antenna will be illustrated.

As shown in FIG. 3, one antenna 3 (feeding portion 3 ₁₎ and the other antenna 4 (feeding portion 4 ₁ ) are provided in the upper blank portion of the heating conductive wire 2 and one antenna 3 is provided in the lower blank portion. The antenna 5 (feeding portion 5 ₁ ) and the other antenna 6 (feeding portion 6 ₁ ) are used as the antennas of the present invention, and a TV antenna 7 and a TV antenna 8 for receiving TV broadcast waves are printed and baked with silver paste. The antenna 3 and the antenna 4 in the upper margin are the antenna 3 of the first embodiment.
It is confirmed that the average reception gain and the directional characteristics are close to 4 and 4, and the average reception gain and the directivity characteristics of the antennas 5 and 6 in the lower margin are also close to the antennas 5 and 6 of the first embodiment. did.

When receiving the audio information of the FM broadcast wave with such an antenna, diversity reception may be performed by the antenna 3 in the upper margin portion and the antenna 5 or the antenna 6 in the lower margin portion. When the character information is received, Diversity reception may be performed by an antenna that does not perform diversity reception of voice information, that is, an antenna in an upper margin portion and an antenna in a lower margin portion.

Further, in this case, the AM radio broadcast wave can be received by the antenna 3 in the upper margin, and when receiving the TV broadcast wave, the TV antenna 7 and the TV antenna 8 receive the FM broadcast audio information. Therefore, the antenna 3 or the antenna 4 of the present invention and the antenna 5 or the antenna 6 may be added to perform diversity reception.

Example 4 This is an example in which a whip antenna (not shown) is provided, and this antenna is also one of the antennas for diversity reception at the time of receiving FM broadcast waves, and it is also possible to receive TV broadcast waves.

As shown in FIG. 4, one antenna 3 (feeding portion 3 ₁ ) is provided in the upper margin of the heating conductive wire 2, and the other antenna 4 (feeding portion 4 ₁ ) is provided in the lower margin. The antenna 5 (feeding portion 5 ₁ ) of the present invention is used as the antenna of the present invention, and in addition, a TV antenna 7, TV for receiving TV broadcast waves.
The antenna 8 is formed by printing and firing with silver paste, and the antenna 3 and the antenna 4 in the upper margin portion are formed.
Is similar to the antennas 3 and 4 of the first embodiment in average reception gain and directional characteristics, and the antenna 5 in the lower margin is the first embodiment.
It was confirmed that the average reception gain and the directional characteristics are similar to the antennas 5 and 6 of.

When receiving the audio information of the FM broadcast wave with such an antenna, the antenna 3 in the upper margin portion and the antenna 5 in the lower margin portion or the whip antenna are used for diversity reception, or the antenna 4 in the upper margin portion. , The whip antenna or the antenna 5 in the lower margin may be used for diversity reception, and when the character information is received, the antenna that does not perform the diversity reception of voice information, that is, the antenna in the upper margin and the antenna in the lower margin or the whip Diversity may be received by the antenna.

Further, in this case, the AM radio broadcast wave can be received by the whip antenna 3, and when receiving the TV broadcast wave, the TV antenna 7 and the TV antenna 8 are received.
In addition, the antenna 3 or the antenna 4 of the present invention for receiving the audio information of the FM broadcast and the antenna 5 may be added to perform diversity reception.

[0029]

As described above, the glass antenna of the present invention does not need a demultiplexer, and therefore there is no loss of antenna reception gain due to the demultiplexer, and FM radio broadcasting (audio information) and FM. It is possible to receive teletext (information other than voice) at the same time.

[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.

FIG. 5: F of one antenna 3 in the upper blank part of the first embodiment
It is a directional characteristic figure in M broadcast wave 84MHz.

FIG. 6 is the F of the other antenna 4 in the upper margin portion of the first embodiment.
It is a directional characteristic figure in M broadcast wave 84MHz.

FIG. 7 is the F of one antenna 5 in the lower blank part of the first embodiment.
It is a directional characteristic figure in M broadcast wave 84MHz.

FIG. 8 is the F of the other antenna 6 in the lower blank area of the first embodiment.
It is a directional characteristic figure in M broadcast wave 84MHz.

[Explanation of symbols]

 1 plate glass 2 conductive wire for heating 3 one antenna in the upper margin part 4 the other antenna in the upper margin part 5 one antenna in the lower margin part 6 the other antenna in the lower margin part 7, 8 TV antenna

Claims (2)

[Claims] 1. A two-antenna is provided in an upper margin portion of a heating conductive wire of a rear window glass for a vehicle, at least one antenna is provided in a lower margin portion, and one antenna of the upper margin portion and a lower margin portion are provided. Diversity reception of FM broadcast wave audio information is performed by one antenna provided on the other side, and information other than FM broadcast wave audio is received by the other antenna in the upper margin part and the other antenna in the lower margin part or an antenna provided in another place. A glass antenna for a vehicle, which is adapted to receive diversity. 2. A heating conductive wire for heating a rear window glass for a vehicle, wherein two antennas are provided in an upper margin portion and at least one antenna is provided in a lower margin portion, and one antenna of the upper margin portion and a lower margin are provided. Diversity reception of information other than the audio information of the FM broadcast wave is performed by one antenna provided in the section, and the FM broadcast wave is received by the other antenna in the upper margin section and the other antenna in the lower margin section or an antenna provided in another place. A glass antenna for a vehicle, which is adapted to receive voice information with diversity.