JPS6142443B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an anti-fog plate glass equipped with an omnidirectional receiving antenna, particularly a heating conductive wire which is installed in the vertical center of a rear window glass of an automobile and which is installed on the upper glass surface of a heating conductive wire that also serves as an antenna. The present invention relates to the above-mentioned anti-fog plate glass, which is provided with an omnidirectional receiving antenna for ultra-high frequency reception electrically connected to the heating conductive wire.

Conventionally, anti-fog sheet glass for use as a rear window glass of an automobile is known, which is equipped with a heating conductive wire that also serves as a receiving antenna, and an ultra-high frequency receiving antenna is connected to the conductive wire by a stub above or below the conductive wire. .

This type of window glass removes fogging from the glass surface by heating the conductive wires by energizing multiple heating conductive wires on the glass surface, and receives AM broadcasts in the medium wave band using the heating conductive wires. It is possible to simultaneously receive FM broadcasts in the ultra-high frequency band using an ultra-high frequency receiving antenna.

However, in the ultra-high frequency band, this ultra-high-frequency receiving antenna has a directional characteristic in which the gain is minimum for radio waves arriving from the front and rear directions of the vehicle, and the reception gain is maximum for radio waves arriving from the side of the vehicle, and the difference in gain is extremely large. are doing. Therefore, when receiving FM broadcasts in the ultra-high frequency band in a place with weak electric field strength, the S/N ratio will deteriorate if a car faces in the direction in which the radio waves are traveling, and even weak incoming radio waves due to reflections will have a negative impact on reception. It will bring about.

In order to solve the above-mentioned drawbacks, the present inventor invented a heating plate glass and receiving antenna, and the present applicant filed a patent application for this invention in Japanese Patent Application No. 54-9523 and Japanese Patent Application Laid-open No. 55-102903. As shown in FIG.
Heating conductive wire 1 between 3, 13a and the common current collector wire 12
heating area 10,10 of a transparent glass plate 1 comprising:
In the area outside a, an ultrashort wave receiving antenna 15 extending approximately parallel to the heating conductive wire starting from a position corresponding to the longitudinal center of the heating conductive wire and being bent back at the edge; a coupling element 16 having at least one parallel line 17 for the conductive wire, which is located between the heating conductive wire and the receiving antenna and is close to the heating conductive wire; A stub 19 is provided integrally with the glass and extends on the opposite side to the receiving antenna, connecting the lead wire and one point 18 of the filament of the coupling element. In the drawing, 20 and 20a are auxiliary elements in which the filament 17 is folded back in parallel, and 21 is an auxiliary filament whose both ends are close to the open ends of the elements 20 and 20a.

This plate glass ultra-high frequency receiving antenna is coupled with a heating conductive wire via a stub and a coupling element, which improves the reception gain in the ultra-high frequency band and has omnidirectional characteristics over a wide range of domestic FM broadcast wave bands from 76MHz to 90MHz. was gotten.

The superpower received primarily by the heating conductive wire and induced in said conductive wire is guided to the circuit with the stub via the coupling element and connected to the lead wire 14'.
Since the signal flows from the terminal 14 to the receiver via a coaxial cable (not shown), even when receiving medium-wave AM using the heating conductive wire, it is possible to obtain considerably excellent receiving sensitivity in areas where the electric field strength is moderate. It will be done. However, in places where the electric field strength is extremely weak, sufficient receiving sensitivity cannot be obtained and the S/N ratio decreases.

The present inventor considered this point, and left the above-mentioned inductive coupling as it is, and connected the starting point to the heating conductive wire with or without the power supply bus or the common current collection line, thereby improving the FM of the antenna.
We were able to maintain the directional characteristics with almost the same broadcast reception gain and improve the AM broadcast reception gain. That is, the present invention provides a position corresponding to the longitudinal center of the heating conductive wire on the upper glass surface outside the area where the heating conductive wire is stretched, of a transparent plate glass on which the heating conductive wire is stretched in the horizontal direction. an ultra-high frequency receiving antenna that extends substantially parallel to the conductive wire with a starting point thereof and is bent at the edge; A coupling element having a filament and close to the conductive wire, and a starting point of the receiving antenna, or a lead wire connected to the starting point, and one point of the filament of the coupling element are connected to each other on the opposite side to the receiving antenna. The starting point is a fog-proof glass pane with an extending stub and an omnidirectional receiving antenna connected to the conductive wire.

Here, a stub is any transmission line whose ends are short-circuited, and usually refers to two parallel wires whose ends are short-circuited.

In the present invention, it is preferable that the edge of the ultra-high frequency receiving antenna be bent on the opposite side to the heating conductive wire. Moreover, the open end is folded back parallel to the heating conductive wire, if necessary.

Further, in the present invention, it is preferable that the coupling element is provided with an auxiliary element in which both ends of the parallel filaments are bent toward the heating conductive wire and further folded back parallel to the heating conductive wire, terminating with a gap between them. Furthermore, it is preferable to provide an auxiliary filament whose both ends are close to each other at the end of the auxiliary element.

Furthermore, in the present invention, the conductive wire connecting the starting point and the conductive wire runs from the starting point to the opposite side of the conductive wire and parallel to the heating conductive wire, and then bends to the opposite side of the conductive wire near the edge of the glass. It is preferable that after being bent, it is folded back and extends along the edge of the glass to an upper generatrix connected to the conductive wire.

The present invention connects the ultra-high frequency receiving antenna and a coupling element, or a coupling element and an auxiliary element with a stub, and improves the FM reception gain in the ultra-high frequency band by closely coupling the coupling element and a heating conductive wire. By further electrically connecting the starting point and the conductive wire while maintaining the characteristics, the AM reception gain in the medium wave band can be greatly improved.

The present invention will be described in detail below with reference to FIG. 2 showing an example. In the drawings, the same members as in FIG. 1 are designated by the same numbers.

In FIG. 2, common current collection lines 12 are provided along the edges of the glass on both sides of the surface of the transparent plate glass 1 in the lateral direction.
A pair of upper and lower busbars 13, 13 provided on the opposite side.
A heating conductive wire 11 is stretched horizontally in parallel between the heating conductive wires 10 and 10a, and the heating conductive wire groups 10 and 10a are connected in series by a current collecting wire 12. The conductive wire group 10, 10
From the lead wire 14 connected to the static suppressing end 14 above the center of the glass surface above the heating area a, run parallel to the heating conductive wire 11 and to the right in the direction of the current collecting wire for an appropriate length, and the tip ends with the conductive wire group. is an ultrahigh-frequency receiving antenna 15 bent to the opposite side, a coupling element 16 that couples the heating conductive wire between the receiving antenna and the heating conductive wire 11, and a coupling element 16 that couples the heating conductive wire 11 to the heating conductive wire 11 from the starting point on the lead wire 14'. A stub 19 runs parallel to the left in the generatrix direction and is bent at the tip to form a U-shape.
It is equipped with The other end of the stub is bent toward the heating conductive wire at approximately the midpoint 1 of the parallel filaments 17 of the coupling element.
It is connected to the filament at 8. A portion of the coupling element near the glass side edge includes an auxiliary element 20 in which the filament 17 is bent toward the heating conductive wire 11 and then folded back so as to be parallel to and on the same line as the conductive wire 11.
20a, and an auxiliary filament 2 for improving coupling so that the auxiliary elements are aligned on the same line with a gap between them.
1 is provided. The key point of the embodiment of the present invention is that the starting point on the lead wire 14' is connected to the upper busbar 13a, and the connecting wire 22 extends from the starting point to the right, bends toward the upper edge of the glass, and then folds back. After going left along the upper edge of the glass, it is bent along the left edge and connected to the upper generatrix 13a, and is adjusted to the optimum length by selecting the bending and folding position. Each member to be energized is obtained by simultaneously printing a conductive paste made of fine silver particles, low melting point glass powder, etc. in an organic solvent onto the window glass 1 by a silk screen method or the like, and then baking the paste. The power to the bus 13 is supplied by a negative grounded power source 23.
from the positive pole of the bus 1 through the coil 24.
The feedback current from 3a is grounded through coil 25. Reference numeral 26 is a capacitor for preventing miscellaneous parts of the power supply, and one side is connected to the power supply line between the power supply and the coil 24, and the other side of the capacitor is grounded. The power supply circuit is provided with an external switch and the like, which a person skilled in the art would insert as needed and will be omitted here.

76MHz using the anti-fog glass antenna of the present invention
When receiving the domestic FM broadcast wave band from 90MHz to 90MHz,
When the antenna of the prior invention shown in FIG. 1 and its directional characteristics were investigated using a receiver through the coaxial cable 28 connected to the electrostatic end 14, the results shown in FIG. 5 were obtained. That is, while the example shown in FIG. 1 exhibits the directional characteristics indicated by the broken line, the one according to the present invention exhibits the directional characteristics indicated by the solid line. According to the present invention, although there was a slight drop in the directivity characteristics for incoming radio waves in the longitudinal direction of the automobile, there was no significant influence on reception in actual use. However, compared to the case of using the anti-fogging plate glass provided with the antenna of the example of FIG. 1, the antenna of the present invention shown in the example of FIG. 2 improved the reception gain by 6 to 8 dB in AM reception. The cause of this is that the signal was received by the heating conductive wire and was induced in the same conductive wire.
While the AM reception current flows through the coupling element, the stub, and the static end, there is a large loss between the couplings, whereas the current induced in the conductive wire flows through the busbar 1.
This is thought to be due to the fact that the current flows through the connection line 22 through the connection line 22 to the terminal, and there is no loss therebetween. FIG. 3 shows another embodiment of the present invention, and parts corresponding to the previous embodiment are designated by the numbers shown in FIG. The embodiment shown in FIG. 3 differs from the embodiment shown in FIG. 2 in the wiring of connection lines. That is, the connecting line is represented by 22a, extends to the right from the starting point, bends toward the upper edge of the glass, then turns back and runs left along the upper edge of the glass, then bends along the left edge, and connects to the stub 19. It runs along the edge of the glass outside the coupling element 16, is bent between the coupling element and the heating conductive wire, runs between them, and is connected at the center of the uppermost heating conductive wire 11. be.

FIG. 4 also shows a second and third embodiment of the present invention.
Parts corresponding to the embodiments in the figures are indicated by the same numbers as in the examples in both figures. In the example of FIG. 4, the wiring of the connection line 22b is as follows. The common current collector line 12 extends leftward from the starting point, bends toward the top edge of the glass, then turns back and runs right along the top edge of the glass, bends along the right edge of the glass, and runs along the right edge. It is distinctive in that it is connected to.

Although the present invention has been carried out with the auxiliary filament 21, the filament 21 is not necessarily necessary. It is also possible to carry out the treatment without the striae. Further, other modifications may be made in modes other than the above examples as long as they fall within the scope of the claims of the present invention.

[Brief explanation of the drawing]

Figure 1 shows the anti-fog glass plate of the earlier application which is equipped with a receiving antenna, Figures 2 to 4 are front views of the anti-fog glass plate which is equipped with the reception antenna according to the present invention, and Figure 5 shows the anti-fog glass plate of the earlier application. It is a directional characteristic diagram measured with that of the present invention and that of the present invention. 1: Transparent plate glass, 10, 10a: heating conductive wire group, 12: common current collection wire, 13, 13a: bus bar,
14: Starting point, 15: Very high frequency receiving antenna, 16:
Coupling element, 19: stub, 22: connection line.

Claims (1)

[Scope of Claims] 1. On the upper glass surface of a transparent plate glass on which a heating conductive wire is stretched in the horizontal direction, outside the area where the heating conductive wire is stretched, in the longitudinal center of the heating conductive wire. an ultra-high-frequency receiving antenna extending substantially parallel to the conductive wire starting from a corresponding position and bent at an edge; and at least one ultra-high frequency receiving antenna parallel to the conductive line between the conductive wire and the ultra-high frequency receiving antenna. A coupling element having a main filament and close to the conductive wire, and a starting point of the receiving antenna or a line connected to the starting point and one point of the filament of the coupling element are connected to each other on the opposite side with respect to the receiving antenna. an anti-fog glass plate comprising an omnidirectional receiving antenna, the starting point being connected to the conductive wire; 2. A connecting conductor connecting the starting point and the conductive wire extends from the starting point to the side edge of the sheet glass, runs along the edge opposite to the upper edge of the glass, and then connects to the conductive wire. The anti-fog plate glass described in item 1.