JP3500695B2 - Rear glass antenna for car broadcast reception - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear glass antenna for receiving car broadcasts, which can optimally receive radio broadcasts and television broadcasts, and in particular, can receive television broadcasts over the entire television broadcast band with flat reception sensitivity characteristics. .

[0002]

2. Description of the Related Art As shown in FIG. 5, in a conventional glass antenna, a defogger consisting of a heater wire H and bus bars B1, B2, B3 is usually provided on a glass plate 71 of a rear window of an automobile, and a heater wire H In order not to interfere with each other, an antenna conductor A4, an antenna conductor 61, and an antenna conductor 62 used for diversity reception for FM broadcast wave reception are provided in the upper and lower margins of the glass plate 71 of the rear window. The antenna conductor A4 provided in the margin above the defogger of the glass plate 71 is also used for receiving AM broadcast waves.

Further, as a television broadcast receiving glass antenna, a plurality of feeding points for television broadcast reception are provided on any of bus bars B1, B2 and B3 provided on the left and right of the defogger so that the defogger serves as an antenna. ,
The antenna conductors 61 and 62 for receiving television broadcasts, which mainly receive the VHF Low band (90 MHz to 110 MHz) and are provided on the lower margin glass plate surface of the defogger, are mainly VH.
A device that receives the FHigh band (170 MHz to 220 MHz) has been proposed. In this conventional example, the antenna conductor 62 is not connected to the defogger. Note that FIG.
In, the antenna conductor 63 is for receiving FM broadcast.

Although not shown in FIG. 5, in this conventional example, in order to prevent the high-frequency current of the broadcast wave excited by the defogger from leaking to the ground, one bus bar and the positive electrode of the battery are connected. A choke coil is inserted and connected in series to at least one of the space and another bus bar and the ground.

[0005]

However, in such a conventional glass antenna, the VHFHigh band is VHFLo.
The receiving sensitivity is insufficient as compared with the w band. Even when trying to eliminate this drawback, the bandwidth of the VHF High band is 50 MHz compared with the bandwidth of the VHF Low band of 20 MHz.
Since it is wide, it is difficult to improve the reception sensitivity in the entire VHF band and make it flat.

[0006]

The present invention has been made to solve the above-mentioned problems, and is provided with a defogger consisting of a heater wire and a bus bar provided on a glass plate of a rear window of an automobile, and a blank glass plate. In a rear glass antenna for receiving a broadcast wave for receiving broadcast waves by a plurality of antenna conductors provided in, a plurality of antenna conductors include a television broadcast antenna conductor and a radio broadcast antenna conductor , and the television broadcast antenna conductor is a radio broadcast antenna conductor. And a television broadcasting antenna conductor are electrically connected to the defogger, and a choke coil is serially connected to at least one of the bus bar and the positive electrode of the battery and the other bus bar and the ground. A rear glass antenna for receiving a car broadcast, which is characterized by being inserted and connected to a rear glass antenna.

[0007] consists of a sub-element television broadcasting antenna conductor is attached to the main element and the main element, the main element provides the automobile broadcast receiving rear glass antenna coupled antenna conductor and the capacitance Radio To do.

Further, as shown in FIG. 1, radio broadcast antenna conductor (21) comprises an element (23), television broadcast antenna conductor (41) and the television broadcast antenna conductor (51) and the element (23) is disposed so as to sandwich the, element (23) provides the automobile broadcast receiving rear glass antenna that is capacitively coupled in proximity to the heater line (H).

That is, in the conventional example, since the radio broadcasting antenna conductor is provided in the margin above the glass plate defogger, the television broadcasting antenna conductor is disposed in the bottom margin. However, some or all of the put that television broadcast antenna conductor to the present invention is disposed above the margin glass plate from defogger, and a sub-element provided as the main element and necessary.

[0010] If the radio broadcast antenna conductor is provided in the lower portion of the margin from the defogger of the glass plate, part or all of the put that television broadcast antenna conductor to the present invention, the bottom margin portion from the defogger It is arranged on a glass plate. That is, some or all of the television broadcast antenna conductor that put the present invention is disposed in the margin portion glass plate on the side where the radio antenna conductor is arranged.

In the present invention, the television broadcasting antenna conductor needs to be capacitively coupled to the radio broadcasting antenna conductor. This capacitive coupling is performed by bringing at least one of the main element and the sub element and the radio broadcasting antenna conductor close to the main element of the television broadcasting antenna conductor or when the TV broadcasting antenna conductor has a sub element. . The capacitive coupling, kill a high-frequency current induced in the radio broadcast antenna conductor television broadcast wave at a profit.

[0012] The length of the main element is a 1/4 wavelength × 0.64 of VHFHigh band wave (glass fractional shortening) 280
Although it should preferably be approximately equivalent to mm to 220 mm, an error occurs due to the stray capacitance of the Defogger and the like, and in reality, 1/4 wavelength × 0.64 × error (0.8 to 2. The range of 560 mm to 176 mm, which is 0), is a preferable range. The length of the main element, the size adjustment described above, preferably the most easily receive dimensions approximately the center frequency 200MHz in VHFHigh band. Regarding the capacitive coupling between the main element and the antenna conductor for radio broadcasting, both are usually 0.2 mm to 30 mm.
It is done by approaching at intervals of .

The sub-element is attached to the main element as required, and when attached, it is partially connected to the main element and usually has a T- shape or L-shape. Further, the main element and the sub element may form a U-shape or a loop shape. The sub-element has a function of flattening the reception sensitivity characteristic and contributing to widening the band.

Further, it is possible to widen the band by appropriately dimensioned adjust the distance between the main element and the secondary element. The distance between the sub element and the main element is preferably about 5 mm to 100 mm.

Although the main element alone may provide good reception sensitivity in a desired frequency band, normally, the high and low frequencies of the desired frequency band tend to have insufficient reception sensitivity. Therefore, by attaching the sub-element to the main element with a certain interval, it is possible to eliminate the unevenness of the reception sensitivity characteristic and to broaden the band.

The television broadcast antenna conductor is connected to the de Fogga, so that utilizes a high-frequency current of the television broadcast waves induced in the defogger. That is, the television broadcast antenna conductor uses the high frequency current of the television broadcast wave induced in both the radio broadcast antenna conductor and the defogger. As for the connecting means between the television broadcasting antenna conductor and the defogger, it is desirable to connect them directly with the connecting conductors from the viewpoint of improving the receiving sensitivity, but capacitive coupling can also be used.

[0017] The position of the connection or capacitive coupling with the television broadcast antenna conductor and the defogger is not particularly limited, the upper portion of the bus bar, central portion in the bus bar, the lower <br/> unit or the heater wire and television broadcasting of the bus bar The antenna conductor may be connected or capacitively coupled. For example, if the radio antenna conductor in the margin of the top than the defogger of the glass plate is provided, the position of the connection or capacitive coupling,
1) central portion in the bus bar, 2) the lower portion of the bus bar, or,
3) Heating lines other than the uppermost line, the if, television broadcast antenna conductor to be extended to the vicinity of an antenna conductor for radio broadcasting, even those areas of the glass plate is small longer actual length of the television broadcast antenna conductor can do.

[0018] If the radio broadcast antenna conductor in the margin of the lower than defogger of the glass plate is provided, the position of the connection or capacitive coupling, 1) in the bus bar
Central unit, 2) the upper portion of the bus bar, or, 3) if the heater wire, other than the bottom line, since the antenna conductor for television broadcasting is extended to the vicinity of an antenna conductor for radio broadcasting, those areas of the glass plate is small However, the actual length of the antenna conductor for TV broadcasting can be increased.

Further, in the present invention, since the defogger is used as an antenna, it is necessary to prevent the high frequency current of the broadcast wave excited by the defogger from leaking to the ground. A choke coil is inserted and connected in series with at least one of the positive electrode and the other bus bar and the ground.

Defogger antenna conductor for TV broadcasting
More by disposing the glass plate of the upper margin, the glass plate of the bottom margin portion from the defogger, for example kill Telephone glass antenna, the other glass antennas such as GPS glass antenna arrangement.

In the present invention, one antenna conductor for television broadcasting may be provided, or two or more antenna conductors may be provided. When two or more are provided, normally, diversity reception using the antenna conductor for television broadcasting having a stronger received signal is adopted.

[0022]

In the present invention, the main element is brought into close proximity to the radio broadcasting antenna conductor and capacitively coupled, and the high frequency current of the television broadcasting wave induced in the radio broadcasting antenna conductor is used, so that the receiving sensitivity in the VHF High band is improved. To do. Further, when the sub-element is additionally provided, the effect of widening the band of the sub-element facilitates the improvement of the reception sensitivity in the VHF High band.

The promotion of improvement of the reception sensitivity in the VHF Low band is as follows.
This is done by connecting the television broadcasting antenna conductor to the defogger and utilizing the high frequency current of the television broadcasting wave induced in the defogger. This is because the width of the defogger is usually within the range of 500 mm to 2000 mm, and this range is 1/4 wavelength of VHF Low band × glass shortening rate 0.64 × error (0.8 to 2.0) = 1060 mm.
This is because it overlaps with the range of ˜352 mm.

[0024]

EXAMPLES Example 1 FIG. 1 shows a rear glass antenna for receiving a car broadcast of Example 1. In FIG. 1, 1 is a glass plate of a rear window of an automobile,
21 is a radio broadcasting antenna conductor for both FM and AM, 2
2 is an element of the antenna conductor 21 for radio broadcasting, and 23
Is an element of the antenna conductor 21 for radio broadcasting, 41,
Reference numeral 51 is a television broadcasting antenna conductor, 42 is a main element, 44 is a feeding point of the television broadcasting antenna conductor 41, 4
5 is a branch point between the main element 42 and the sub element 43,
46 is a connection conductor, B1, B2 and B3 are bus bars, 31 is an FM broadcast antenna conductor, and H is a heater wire. In addition, in Example 1, the sub-element 43 was not provided.

[0025] In Example 1, the heater wire H constituting the defogger for defogging near center of the glass plate 1 of an automobile rear window and is arranged, the upper part of <br/> margin glass than defogger a plurality of antenna conductor in a predetermined pattern having a line width of 0.7mm was baked printed by a plate 1 of the surface and the defogger from the bottom of the margin surface of the glass plate 1 conductive paste (example 1, silver paste) is disposed There is.

The radio broadcasting antenna conductor 21 and the FM broadcasting antenna conductor 31 shown in the first embodiment are used for diversity reception for radio.

In the first embodiment, apart from the radio broadcasting antenna conductor 21 and the FM broadcasting antenna conductor 31, the television broadcasting antenna conductors 41 and 51 are arranged near the radio broadcasting antenna conductor 21 and the defogger. did. Further, the element 23 which is a part of the radio broadcasting antenna conductor 21 is sandwiched between the television broadcasting antenna conductor 41 and the television broadcasting antenna conductor 51.

The element 23 is capacitively coupled in the vicinity of the heater line H and utilizes the high frequency current of radio broadcasting induced in the defogger.

The television broadcasting antenna conductor 41 has a main element 42. The main element 42 is the element 22 that extends in the left-right lateral direction of the radio broadcast antenna conductor 21.
The antenna conductors 21 for radio broadcasting are close to each other at 10 mm intervals.
The high frequency current induced in the antenna is guided to the feeding point 44 of the television broadcasting antenna conductor 41 by using capacitive coupling.

[0030] As described above, it is possible to improve the reception sensitivity of VHFHigh band by performing the appropriate dimension adjusting the length of the main element 42 <br/> the range of 560Mm～176mm. Main element 42 in the first embodiment
The length (distance from the right end to the tip of the feeding point 44) was set to 400 mm as a result of appropriate dimension adjustment.

In the first embodiment, the feeding point 44 and the bus bar B1 are connected to each other by the connecting conductor 46 having a line width of 0.7 mm as shown in FIG. 1, and not only the VHF High band but also the VHF Lo.
We also aimed to improve the receiving sensitivity in the w band.

In Example 1, the horizontal dimension of the heater wire H was 1240 mm in actual length.

The television broadcasting antenna conductor 51 of the first embodiment has the same effects as the television broadcasting antenna conductor 41.

FIG. 4 shows the receiving sensitivity characteristics of the television broadcasting antenna conductor 41 of the first embodiment and the conventional television broadcasting antenna conductor 61. As can be seen from FIG. 4, VHFHi
In the gh band, the television broadcasting antenna conductor 41 of Example 1 exhibits flat reception sensitivity characteristics as compared with the conventional television broadcasting antenna conductor 61 shown in FIG.

Regarding the reception sensitivity characteristic in the VHF Low band, the television broadcasting antenna conductor 41 of Example 1 exhibits almost the same characteristics as the conventional television broadcasting antenna conductor 61, and the reception sensitivity is in the range of 45 dBμV ± 3 dBμV. .

In the first embodiment, since the television broadcast antenna conductors 41 and 51 are symmetrical with respect to the center of the glass plate 1 and have a simple shape, they are excellent in design.

(Embodiment 2) A sub-element 43 (shown by a broken line) is attached to the main element 42 of the antenna conductor for television broadcasting similar to that of Embodiment 1,
A rear glass antenna for receiving a car broadcast shown in FIG. 1 was created.

The position of the branch point 45 between the main element 42 and the sub element 43 is preferably about 0 to 100 mm on the main element 42 from the right end of the feeding point 44. In Example 2, it was set to 20 mm.

The distance between the sub-element 43 and the main element 42 was 25 mm in the second embodiment. Sub-element 4
Length of 3 (length of the conductor from the branch point 45 to the tip of the sub-element 43) results were appropriately dimensioned 405mm
And

The receiving sensitivity characteristics was as shown in broken line in FIG. 4.

(Embodiment 3) FIG. 2 shows a rear glass antenna for receiving a car broadcast of Embodiment 3. Use 2, same as that of FIG. 1 member of the same sign
I have had. The third embodiment is different only in that the main element 42 and the sub element 43 form a loop shape, and that the position of the connecting conductor 46 is provided between the sub element 43 and the heater wire.

The length of the loop-shaped conductor formed by the main element 42 and the sub-element 43 (not including the length from the right end of the feeding point 44 to the branch point 45) was 810 mm. The dimensions of the other parts were the same as in Example 1. The reception sensitivity characteristic was almost the same as that of the second embodiment.

(Embodiment 4) FIG. 3 shows a rear glass antenna for receiving a car broadcast of Embodiment 4. Use 3, same as that of FIG. 1 member of the same sign
I have had. In the fourth embodiment, the television broadcasting antenna conductor 4 is used.
1 was placed in the margin above the radio broadcast antenna conductor 21 of the glass plate 1.

The branch point 45 is located at an arbitrary position on the main element 42 from the upper end of the feeding point 44 so that a part of the main element 42 extending laterally from the branch point 45 does not contact the radio broadcasting antenna conductor 21. The position can be. The vertical distance between the lateral portion of the main element 42 and the radio broadcast antenna conductor 21 was 10 mm, and both were capacitively coupled. In the fourth embodiment, the main element 42
The length of the (conductor length from the upper end of the feeding point 44 to the tip) is shown as the result 500mm was performed appropriately dimensioned.

The position of the branch point 45 was set to 100 mm above the main element 42 from the upper end of the feeding point 44. The distance between the sub element 43 and the main element 42 is 2 in the fourth embodiment.
It was set to 5 mm. The length of the sub-element 43 ( the length from the branch point 45 to the tip of the sub-element 43) was set to 250 mm as a result of appropriate dimensional adjustment.

The dimensions of the other parts were the same as in Example 1. The reception sensitivity characteristic was almost the same as that of the second embodiment.

(Embodiment 5) FIG. 6 shows a rear glass antenna for receiving a car broadcast of Embodiment 5. Use 6, same as that of FIG. 1 member of the same sign
I have had. In the fifth embodiment, the television broadcasting antenna conductor 6 is used.
1 is connected to a feeding point 64 connected to the lower part of the bus bar B1, and a part of the television broadcasting antenna conductor 61 is connected to the glass plate 1
It was placed in the margin above the Defogger.

The television broadcasting antenna conductor 71 is connected to the feeding point 74 connected to the lower portion of the bus bar B3, and a part of the television broadcasting antenna conductor 71 is provided in the margin above the Defogger on the glass plate 1. did.

With such a configuration, even if the area of the glass plate 1 is small, the antenna conductor 6 for television broadcasting is used.
The actual length of 1, 71 can be increased.

(Sixth Embodiment) FIG. 7 shows a rear glass antenna for receiving a car broadcast of a sixth embodiment. Use 7, same as that of FIG. 6 members the same reference numerals
I have had. In the sixth embodiment, the television broadcasting antenna conductor 6 is used.
1 is composed of a main element 62 and a sub-element 63,
The television broadcasting antenna conductor 71 includes a main element 72 and a sub element 73, and other specifications are the same as those in the fifth embodiment.

(Embodiment 7) FIG. 8 shows a rear glass antenna for receiving a car broadcast of Embodiment 7. Use 8, same as that of FIG. 6 members the same reference numerals
I have had. In the seventh embodiment, the television broadcasting antenna conductor 7 is used.
1 is attached to the feeding point 74, and the sub-element 73 which constitutes 1
The sub element 73 is sandwiched between the two heater wires so that the sub element 73 can be easily provided on the television broadcasting antenna conductor 71 even when the area of the glass plate 1 is small.

(Embodiment 8) FIG. 9 shows a rear glass antenna for receiving a car broadcast of Embodiment 8. Use 9, same as that of FIG. 6 members the same reference numerals
I have had. In Example 8, the antenna conductor 7 for television broadcasting is used.
1 was placed in the margin above the radio broadcast antenna conductor 21 of the glass plate 1.

In Examples 5 to 8, the receiving sensitivity in the VHF High band and VHF Low band was improved by several dB as compared with the conventional example shown in FIG.

As a modification of the eighth embodiment, the television broadcasting antenna conductor 61 may be arranged in the margin above the radio broadcasting antenna conductor 21 of the glass plate 1.

The present invention is based on FIGS. 1 to 3 and 6 to 9.
It is not limited to the specifications such as the shape shown in. In addition, in FIGS. 1 to 3 and 6 to 9, the defogger is the busbars B1 and B.
It is a so-called U-shaped defogger having three busbars 2 and B3, but is not limited to this and may be a so-called C-shaped defogger having two busbars.

[0056]

According to the present invention, the antenna conductor for television broadcasting is brought into close proximity to the antenna conductor for radio broadcasting and capacitively coupled, and the high frequency current of the television broadcasting wave induced in the antenna conductor for radio broadcasting is utilized, and In order to electrically connect the broadcasting antenna conductor to the defogger, the television broadcasting antenna conductor uses the high frequency current of the television broadcasting wave induced in both the radio broadcasting antenna conductor and the defogger. Therefore, not only make improve the reception sensitivity of VHFLow band, the receiving sensitivity of VHFHigh band
Can also be improved. Further, when the sub-element is attached to the main element, the effect of widening the band of the sub-element promotes the improvement of the reception sensitivity in the VHF High band.

[0057] For improving the promotion of the receiving sensitivity of the VHFLow band, power a television broadcast antenna conductor to the defogger
This is done by making a physical connection and utilizing the high frequency current of the television broadcast wave induced in the Defogger. Thus, the present invention kills with receiving a television broadcasting band throughout a flat receiver sensitivity.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment or a second embodiment.

FIG. 2 is a front view of the third embodiment.

FIG. 3 is a front view of the fourth embodiment.

FIG. 4 is a reception sensitivity characteristic diagram of a conventional example, the first example, and the second example.

FIG. 5 is a front view of a conventional example.

FIG. 6 is a front view of the fifth embodiment.

FIG. 7 is a front view of the sixth embodiment.

FIG. 8 is a front view of the seventh embodiment.

9 is a front view of Example 8. FIG.

[Explanation of symbols]

1: Glass plate on the rear window of the car 21: Radio conductor antenna conductor for both FM and AM 22: Element of the antenna conductor 21 for radio broadcasting 23: Element of antenna conductor 21 for radio broadcasting 41, 51: Antenna conductor for TV broadcasting 42: Main element 43: Sub-element 44: Feeding point of antenna conductor 41 for television broadcasting 45: a branch point between the main element 42 and the sub element 43 46: Connection conductor B1, B2, B3: Bus bar 31: FM broadcast antenna conductor H: heater wire

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01Q 1/32 B60R 11/02

Claims (3)

(57) [Claims] 1. A rear glass antenna for receiving a car broadcast , comprising a defogger consisting of a heater wire and a bus bar provided on a glass plate of a rear window of an automobile, and receiving a broadcast wave by a plurality of antenna conductors provided on a glass plate of a blank portion. in multiple antenna conductor consists of a television broadcast antenna conductor and the radio antenna conductor, TV broadcast antenna conductor is coupled antenna conductor and the capacitance radio, television broadcast antenna conductor electrically connected to the defogger A rear glass antenna for receiving a car broadcast, wherein a choke coil is inserted and connected in series between at least one of the bus bar and the positive electrode of the battery and between the other bus bar and the ground. 2. A television broadcasting antenna conductor comprising a main element and a sub-element attached to the main element,
Automotive broadcast receiving rear glass antenna according to 請 Motomeko 1 that the main element is coupled antenna conductor and capacitor radio. 3. A radio broadcasting antenna conductor (21) comprises a Jer <br/> instrument (23), television broadcast antenna conductor (41) and the television broadcast antenna conductor and (51) of the element (23) It is disposed so as to sandwich the element (23) is a heater wire (H)
To claim 1 or claim 2 that is capacitively coupled in proximity to
The rear glass antenna for receiving the car broadcast described .