JP2003008317A - Antenna assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna holder and an antenna assembly which is easily mountable on a windshield. SOLUTION: An antenna 2 is housed in an antenna bracket 5 composed of an upper and lower cases 3, 5. The upper case 3 at the windshield side has a bracket board 7 inserted and fixed between the windshield and the head lining. The lower case 4 has a holder 10 available for setting the antenna 2 at a desired angle for transmitting/receiving radio waves, different from the inclination angle of the windshield.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device mounted on a flat surface or a curved surface, and more particularly to an antenna device mounted on a window glass of a vehicle and connected to an on-vehicle device of an automatic toll collection system.

[0002]

2. Description of the Related Art A conventional antenna device installed in a vehicle for receiving or transmitting radio waves is installed on a dashboard of a vehicle or the like and transmits or receives radio waves transmitted through a window glass of the vehicle. Was there.

[0003]

However, in recent vehicles, airbags and the like are mounted on the dashboard, and there are restrictions on the installation position of the antenna device on the dashboard, and in order to improve the appearance. There is also a demand not to install an antenna device etc. on the dashboard.

Further, the window glass is processed to have an effect of preventing transmission of ultraviolet rays (for preventing fading in the vehicle and sunburn of people in the vehicle) and preventing transmission of infrared rays (for preventing temperature rise in the vehicle). Broken glass is often used, and glass processed in such a manner is also a radio wave impermeable glass having a property of not transmitting (or not transmitting) radio waves in most cases. In the case of such a window glass, it is difficult to transmit and receive radio waves with the antenna device on the dashboard, and it is possible to transmit a part of the window glass as a propagation path of the radio waves to the antenna device. In the antenna device of, the distance from the window glass is large, and in order to enable the propagation path of the radio wave to correspond to a wide range of angles, it is necessary to provide a wide portion for transmitting the radio wave. The effect as glass decreases.

The present invention solves the above-mentioned conventional problems and provides an antenna device which can be easily installed on a window glass of a vehicle.

[0006]

The antenna device of the present invention is provided with a protrusion on the outer periphery of the antenna bracket in which the antenna part is housed, and the protrusion is provided at the end of the transmission surface through which radio waves pass. It was configured to be inserted and fixed in the gap. Therefore, it becomes easy to install the antenna device on the outer periphery of the surface through which radio waves can pass.

In the antenna device of the present invention, the end of the transparent surface is the end of the window glass of the vehicle, and the protrusion is inserted into the gap provided at the end of the window glass of the vehicle. It was configured. Therefore, it becomes easy to install it on the outer periphery which is the end portion of the window glass along the window glass of the vehicle.

Also, in the antenna device of the present invention, the gap provided at the end of the window glass of the vehicle is different from that of the window glass.
A gap is formed between the head lining on the inner side of the vehicle near the roof of the vehicle.

Therefore, it is possible to use, as a radio wave propagation path, a space at a high position in the window glass of a vehicle where the transmission or reception sensitivity is high, and which is open in the traveling direction of the vehicle away from both side surfaces of the vehicle. It is possible to fix the antenna device at a position where there is little influence of attenuation of radio waves due to obstacles such as buildings on the side of the vehicle.

Further, in the antenna device of the present invention, the gap provided at the end portion of the window glass of the vehicle is a gap between the roof of the vehicle and the headlining inside the vehicle near the roof. And

Therefore, even when the gap between the window glass and the headlining is narrow or absent, the antenna device can be fixed in the gap between the roof and the headlining.

Further, the antenna device of the present invention is configured such that the transmitting / receiving antenna of the automatic fee collection system is used for the antenna section.

Therefore, the transmission / reception frequency of radio waves is 5.8G.
It is as high as Hz and can be used for an on-vehicle antenna device of an automatic toll collection system that transmits and receives to and from a roadside antenna device installed above the vehicle at a gate through which the vehicle passes.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an antenna device of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the antenna device of the present invention, and FIG. 2 is an exploded sectional view of the embodiment of the antenna device of the present invention.

In FIG. 1, an antenna device 1 is an automatic toll collection system (Electronic Toll C).
An antenna device for transmitting and receiving radio waves to and from an in-vehicle device in an collection system (hereinafter abbreviated as ETC) and an antenna device connected to a roadside device of ETC installed in a tollgate of a highway. The antenna section 2 for transmitting and receiving radio waves is held inside an antenna bracket 6 in which an upper case 3 and a lower case 4 are fixed with screws 5. A top view of the upper case 3 is shown in FIG. 3, and a top view of the lower case 4 is shown in FIG.

Here, the upper case 3 is arranged on the side of the windshield of the vehicle, which is in front of the traveling direction and is inclined, on the side to be attached from the inside of the vehicle (upper side in the vertical direction at the time of installation). The lower case 4 is arranged on the side viewed from the inside of the vehicle (the lower side in the vertical direction when installed).

The upper case 3 is provided with a plate-like bracket plate 7 which is a part of the upper case 3 as a projecting portion at a position above the slanted windshield and at a position facing the antenna section 2. Is provided with an opening 9 in which a space is formed and a radio wave can be transmitted (the radio wave is not shielded), and it is easy for the antenna section 2 to transmit and receive a radio wave through the opening 9.

A double-sided adhesive tape 8 as an adhesive material is provided on the upper surface of the upper case 3 which is in contact with the inclined windshield of the upper case 3 to bond the windshield and the antenna device 1 (upper case 3). ing.

Further, the lower case 4 is provided with a holding portion 10 formed in a vertical and horizontal projection shape in order to hold the antenna portion 2 horizontally.
It is provided according to the inclination of the windshield.

A communication cable 11 for transmitting / receiving a transmission / reception signal and a control signal to / from the vehicle-mounted device of the ETC from the antenna part 2 is provided with a cable groove 12 provided near the bracket plate 7 of the upper case 3. And a cable hole 13 formed by the lower case 4 communicates with the outside (equipment mounted on the ETC).

When assembling the antenna device,
Place the antenna part 2 on the holding part 10 of the lower case 4,
The communication cable 11 is provided to the upper case 3 after the communication cable 11 is put out to the outside from the side forming the cable hole 13 and the upper case 3 is placed on the lower case 4 so that the communication cable 11 fits in the cable groove 12. The screw 6 can be screwed to the protrusion 15 provided on the lower case 4 through the screw hole 14. Here, a screw 6 is provided at one place on the lower side of the inclined windshield, and a communication cable is provided at the center on the opposite side of the inclined windshield to the upper side of the inclined windshield for easy wiring. Two parts are fastened with screws 6 so as to sandwich 11. In addition, the projection 15 is preliminarily provided with a hole having a diameter smaller than that of the screw 6 so as to facilitate screwing.

Next, a state in which the antenna device 1 is attached to a vehicle will be described with reference to FIG. 5 which is a sectional view of the antenna device attached state according to the embodiment of the present invention.

A windshield 21 is attached to the vehicle 20 so as to be inclined forward in the traveling direction, and in the vicinity of the roof 22 which is the roof of the vehicle (above the windshield 21), the windshield 21 is located inside the windshield 21. A headlining 23 is provided, and the windshield 21 and the headlining 23 are in contact with each other, but a plate-shaped object can be inserted therein. When the plate-shaped object is inserted, the windshield 21 and the headlining 23 can be inserted. It is sandwiched between 23 and has a structure that is hard to come out.

The bracket plate 7 of the antenna device 1
Is inserted between the windshield 21 and the headlining 23 so as not to come off easily, and the double-sided tape 8 is used to attach the antenna device 1 (upper case 3) to the windshield 21.
Is further bonded.

The communication cable 11 which is connected to the outside through the cable hole 13 is also inserted between the headlining 23 and the windshield 21 and is connected to an ETC vehicle-mounted device (not shown) installed in the vehicle.

Except for a part, the windshield 21 has effects such as prevention of ultraviolet ray transmission (for preventing fading in the vehicle and sunburn of persons in the vehicle) and infrared ray transmission (for preventing temperature rise in the vehicle). Is processed (for example, it is manufactured by mixing lead and the like), and in this case, it has a characteristic that radio waves are not transmitted (shielded). Then, the portion of the windshield 21 to which the antenna device 1 is attached is not integrally processed so as to have a characteristic of not transmitting (shielding) such a radio wave (for example, integrally manufactured so that lead is not mixed into a specific position). Yes, at the position where the antenna device 1 is attached, radio waves can be transmitted and received through the windshield 21.

Therefore, in the antenna device 1 according to the first embodiment of the present invention, by providing the bracket plate 7, the bracket plate 7 is inserted between the windshield 21 and the headlining 23, and the antenna device 1 is installed. The antenna device 1 can be securely fixed at a predetermined position on the windshield 21 (particularly, the movement of the antenna device 1 in the direction away from the windshield 21 can be prevented), and the antenna device 1 is further bonded to the windshield 21 by using the double-sided tape 8. Therefore, it is possible to prevent the bracket plate 7 from moving in the insertion / removal direction between the windshield 21 and the headlining 23, so that the antenna device 1 is less likely to drop from the windshield 21. At the end of the windshield 21,
The bracket plate 7 may be inserted between the roof 22 and the headlining 23 above the windshield 21.

Further, since the antenna device 1 is located in a portion of the windshield 21 where infrared rays and ultraviolet rays are transmitted together with radio waves, infrared rays and ultraviolet rays may be transmitted to the inside of the vehicle rather than the antenna apparatus 1. Since it is not present, fading due to ultraviolet rays and temperature rise due to infrared rays are less likely to occur inside the windshield 21.

The communication cable 11 connected to the vehicle-mounted device of the ETC (not shown) is exposed to the outside of the antenna device 1 through the cable hole 13 located near the bracket plate 7, so that the communication cable 11 is headlining. The communication cable 11 can be concealed from the visible position by inserting it between the windshield 23 and the windshield 21. Even if the communication cable 11 is not inserted between the headlining 23 and the windshield 21, the communication cable 11 is wired along the end portion of the headlining 23 on the windshield 21 side so that it is not conspicuous and does not block the view in the front. You can also

Further, the antenna unit 2 can be attached by the holding unit 10 at an angle that optimizes the transmission and reception direction of radio waves without being affected by the inclination angle of the windshield 21.

In the embodiment of the present invention, the antenna device 1 used for ETC has been described. However, in order to receive a GPS signal in the positioning system at the current position by the GPS satellite used as a function of car navigation or the like. GPS receiving antenna may be used as the antenna unit 2, a VICS signal receiving antenna also used in car navigation or the like may be used as the antenna unit 2, and an antenna of a wireless device such as a mobile phone may be used as the antenna unit 2. . 5.8G for ETC
Since a radio wave having a high frequency of Hz is used, the radio wave has a strong straight traveling property (a radio wave propagation from other than the radio wave opaque glass is unlikely to occur), and the radio wave attenuation by the radio wave opaque glass also becomes large. The device is particularly effective.

Further, the mounting position of the antenna device 1 has been described by using an example in which it is mounted on the upper side of the windshield 21 where the roof 22 is located, but the lower end portion of the windshield 21 other than the upper end portion or the left and right sides. The bracket plate 7 may be inserted at the end of the vehicle, or the bracket plate 7 of the antenna device 1 may be inserted between the window glass and the wall surface inside the vehicle at the end of the window glass beside or behind the vehicle. May be. Note that the antenna unit 2 is often higher in reception sensitivity at a higher position, and the upper field of the windshield 21 is less likely to obstruct the front field of view even if the antenna device 1 or the like is attached. As described above, it is particularly desirable to mount the antenna device 1 on the upper side of the windshield 21, and in this case, since it can be moved away from the operating range of the wiper (wiper blade), the propagation path of the radio wave is shielded by the wiper during the wiper operation. Nothing. Further, the antenna device 1 should be installed near the center of the upper part of the windshield 21 so that the operation of a sun visor or the like for the sunshade provided near the upper part of the windshield 21 and on the right side or the left side in the vehicle (for the shade) Movement of the position) is difficult to prevent. Also, in this case, it is effective because the traveling direction, which is an open direction, which is away from the left and right of the vehicle where there are many radio wave obstacles such as buildings and where there are no obstacles, is the radio wave propagation path. is there.

Further, in many vehicles, the upper side of the windshield 21 is painted black or the like to take into consideration the appearance design. In that case, the antenna device 1 is also difficult to see from the outside of the vehicle, and therefore the appearance design is not damaged. .

Further, in the antenna device placed on the dashboard, there is a possibility that the antenna device may not be able to receive the radio wave when a radio wave shield is placed on the antenna device (between the antenna device and the windshield 21). However, since the antenna device 1 of the present invention and the windshield 21 are close to or in contact with each other, and there is no object that blocks radio waves, there is no fear of disturbing reception.

[0036]

As described above, according to the present invention, by providing the protruding portion on the outer peripheral portion of the antenna bracket in which the antenna portion is housed, the protruding portion is provided in the gap provided at the end portion of the transmitting surface through which radio waves are transmitted. There is an effect that it becomes easy to insert the part and fix the antenna device.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of an antenna device of the present invention.

FIG. 2 is an exploded sectional view of an embodiment of an antenna device of the present invention.

FIG. 3 is a top view of the upper case of the embodiment of the antenna device of the present invention.

FIG. 4 is a top view of the lower case of the embodiment of the antenna device of the present invention.

FIG. 5 is a sectional view of the antenna device according to the embodiment of the present invention in a mounted state.

[Explanation of symbols]

1 antenna device 2 antenna 3 upper case 4 lower case 5 antenna bracket 6 screws 7 Bracket plate 8 double-sided tape 9 openings 10 Holder 11 Communication cable 12 cable groove 13 cable hole 14 screw holes 15 Projection 20 vehicles 21 windshield 22 roof 23 Headlining

Claims (5)

[Claims] 1. An antenna bracket having an antenna part accommodated therein is provided with a protrusion on an outer peripheral portion thereof, and the protrusion is inserted and fixed in a gap provided at an end of a transmission surface for transmitting radio waves. And antenna device. 2. The end of the transparent surface is an end of a vehicle window glass, and the protrusion is inserted into a gap provided at the end of the vehicle window glass. Item 1
The antenna device according to. 3. A gap provided at an end portion of the window glass of the vehicle is a gap between the window glass and a headlining inside a vehicle near a roof of the vehicle. Item 2. The antenna device according to item 2. 4. The gap provided at the end portion of the window glass of the vehicle is a gap between a roof of the vehicle and a headlining inside the vehicle near the roof. The antenna device according to claim 2 or claim 3. 5. The antenna device according to claim 1, wherein a transmitting and receiving antenna of an automatic toll collection system is used for the antenna unit.