JP2000101324A - Antenna system for transmitter-receiver mounted on construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna system that does not produce noncovmities, such as damages or interference to other devices, even during the construction work in a forest or the like. SOLUTION: The front of a cab 11 of a construction machine is provided with a front window 12, and the rear face of the cab 11 is provided with a rear window 13. Furthermore, an entrance door is provided with a door window 14, the left side face of the cab 11 is provided with a left side window 15, and a right side face of the cab 11 is provided with a right side window. The front window 12 is equipped with a wiper and is installed capable of opening/closing in the vertical directions. Moreover, the door window 14 is opened/closed every time the operator gets on/off the machine. An antenna 18 is provided to one or both of the rear window 13 and the left side window 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an antenna device for a transceiver mounted on a construction machine.

[0002]

2. Description of the Related Art Construction machines are sometimes used in the event of a disaster such as a great earthquake, and traffic restrictions, traffic congestion, accidents,
There are times when you want to know the road conditions such as road surface conditions. In addition, there are cases where it is desired to listen to a radio broadcast even during work. Therefore,
Conventionally, construction machines are also equipped with a receiving device such as a radio, and some are also equipped with telephone equipment and the like.
Radio waves used for receivers such as radios use AM waves of about 1600 kHz or FM waves of about 800 MHz. Radio waves of about 800 MHz or about 1.5 GHz are used for telephones.
An antenna is indispensable for the receiving device, and the antenna catches radio waves flying in the air, and different antennas are used depending on the wavelength of the radio waves to be received. An antenna mounted on a conventional construction machine uses a pole antenna without directivity. It is configured to be able to expand and contract according to the wavelength of the received wave. This antenna is called a whip antenna because it resembles a whip.

FIG. 2 shows a construction machine equipped with a conventional whip antenna. FIG. 2A is a left side view of the operator cab (left side as viewed from the operator).
(B) shows a right side view. As shown in FIG. 2, a whip antenna 12
Is attached. The length of the antenna is related to the wavelength of the radio wave to be received, and in order to transmit and receive a plurality of types of radio waves, it has been conventionally performed to make the length of the antenna 12 extendable. In addition, a plurality of antennas have been provided in accordance with the wavelengths of the transmitted and received waves.

However, if the antenna is extended and lengthened, when working on a farm or in a mountainous area with trees, tree branches and vines may collide with or wrap around the antenna, causing the antenna to be deformed or damaged. Troubles occurred. In addition, if a plurality of antennas are provided close to each other, they may interfere with each other and may not be received properly. Further, when the attachment is moved up and down during the work, there is a problem that the attachment and the antenna interfere with each other and cannot be received properly.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an antenna device which has been made under the above-mentioned background and does not cause any trouble such as breakage or interference. .

[0006]

The present invention employs the following means to solve the above-mentioned problems. That is, claim 1
The described invention is characterized in that the transmitting or receiving antenna of the construction machine is constituted by a printed antenna or a glass antenna, and the antenna is provided on a window glass of an operator cab.

According to a second aspect of the present invention, in the first aspect, the printed antenna or the glass antenna is embedded in the window glass.

According to a third aspect of the present invention, in the first aspect, the printed antenna or the glass antenna is attached to the window glass.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the printed antenna or the glass antenna is provided on a rear window glass of an operator cab.

[0010]

FIG. 1A is a view of the cab as viewed from the front, and FIG. 1B is a view of the cab as viewed from the back. FIGS. 2A to 2C are diagrams showing an example of the configuration of an antenna.
(A)-(C) is a figure which shows the example of the fixing structure of an antenna. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, a front window 12 is provided in front of a cab 11 of a construction machine, and a rear window 13 is provided in a rear surface of the cab 11. In addition, a door window 14 is provided on the entrance door, a left side window 15 is provided on the left side surface of the cab 11, and a right side window (not shown) is provided on the right side surface. Front window 1
Reference numeral 2 denotes a wiper, or a vertically openable / closable wiper. The door window 14 is opened and closed every time the operator gets on and off the vehicle. Therefore, in this embodiment, the antenna is connected to the rear window 13 or the left side window 1.
5, or both.

An antenna 18 is provided in the rear window 13 and is constituted by a single or a plurality of planar antennas. For example, when configuring with multiple antennas,
It may be configured as shown in FIG. FIG. 2A shows an example in which a plurality of antennas are arranged on the same plane, and the directivity of each antenna is optimized by interference between the antennas.
In this example, a smaller medium-sized loop antenna 21b is arranged inside the large loop antenna 21a, and a smaller loop antenna 21c is further arranged inside the medium loop antenna 21b.

FIG. 2B shows two rectangular loop antennas 2.
An example is shown in which 2a and 22b are arranged close to each other to optimize the directivity by mutual interference between antennas. FIG.
(C) shows loop antennas 23a and 2a on different glass planes.
This is an example in which a switch 3b is provided and a changeover switch 24 is provided so as to select a better reception radio wave condition. As described above, when a printed antenna or a glass antenna is used, by providing a plurality of antennas, radio waves having different wavelengths can be received. Note that, here, the printed antenna is a general term for an antenna formed by printing a conductive wire on a resin plate or a glass surface, and the glass antenna is a general term for an antenna formed by attaching a conductive wire to a resin plate or a glass surface by bonding or the like. I do.

FIGS. 3A to 3C show an example of a method for fixing an antenna to a window glass. FIG. 3A shows an example in which an antenna circuit is printed on a transparent resin plate, for example, a transparent plastic plate 28 on the surface of a window glass 27, and is attached with an adhesive or the like. A terminal 29 is provided in the antenna circuit, and a transmitter or a receiver (not shown) is hard-wired to the terminal 29. Note that the induction wire may be formed into a predetermined antenna shape without using a resin plate or the like, and may be directly adhered to the surface of the window glass 27 with an adhesive or the like. The antenna configured in this manner is easy to attach and detach.

FIG. 3B shows an example in which a printed or glass antenna 31a, 31b is sandwiched between window glasses 32, 33 in a sandwich manner. Window glass 3
The reference numerals 2 and 33 may be configured such that the contact surface is brought into a molten state to expel air or the like between the glass surfaces and press-bonded. Alternatively, the window glasses 32 and 33 may be bonded with a transparent adhesive. A transceiver is connected to terminals 34 and 34 'of the antennas 31a and 31b. Since this antenna is sandwiched between two glass plates, the antenna does not rust or peel off.

FIG. 3C shows an example in which the antenna lead wires 36 and 37 are arranged from the beginning, and the antenna lead wire is embedded in the molten glass to form the window glass 38. Terminal 39,
A transceiver is connected to 40. In this configuration, the thickness of the window glass is one, the transparency of the window glass can be maintained, and the antenna can be arranged close to the glass surface.

Since the antenna device of this embodiment is provided with one or more antennas in the rear window 13 and / or the left side window 15 of the operator cab, the antenna device can be used under a tree in a forest or a farm. However, there is no problem that the antenna is damaged or damaged. Further, there is no problem that the directivity and the received radio wave are weakened due to interference due to the operation of raising and lowering the boom. If a plurality of antennas are provided at a plurality of locations and optimally arranged, interference between the antennas can be minimized, and the antenna can be used for a plurality of types of wireless devices (radio, telephone, television). Furthermore, the rear window 13 or the left side window 1
If the number 5 is provided, there is also an effect that it is possible to minimize the hindrance of the visual field during the operation and driving of the operator. Further, by eliminating the pole antenna projecting outside the cab, cleaning of the cab, particularly by a machine, becomes easy.

The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the examples, and the design can be changed without departing from the scope of the present invention. The present invention is included in the present invention even if there are others. For example, the case where an antenna is provided on the windshield 12 is also included in the present invention. Further, the case where the short pole antenna 41 is provided behind the cab and used together with the printed antenna or the glass antenna is also included in the scope of the present invention.

[0019]

As described above, according to the structure of the present invention, even when working under a tree such as a forest or a farm, there is no problem that the antenna is broken or damaged. Is obtained. Further, according to the fourth aspect of the present invention, since there is no radio wave interference with the attachment, there is also an effect that good reception and transmission can be performed.

[Brief description of the drawings]

FIG. 1A is a view of the cab as viewed from the front, and FIG.
Is a view from the back of the cab.

FIGS. 2A to 2C are diagrams illustrating an example of an arrangement configuration of an antenna.

FIGS. 3A to 3C are diagrams illustrating an example of an antenna mounting structure.

FIG. 4 is a diagram showing a conventional antenna device.

[Explanation of symbols]

 13 Rear window 15 Left side window 18, 19 Antenna device 21, 22, 23 Antenna 27, 32, 33, 38 Window glass 29, 34, 39 Input / output terminal

Claims (4)

[Claims] 1. An antenna device for a transceiver mounted on a construction machine, wherein the transmission or reception antenna of the construction machine is constituted by a printed antenna or a glass antenna, and the antenna is provided on a window glass of an operator cab. 2. The antenna device for a transceiver mounted on a construction machine according to claim 1, wherein the printed antenna or the glass antenna is embedded in the window glass. 3. The antenna device for a transceiver mounted on a construction machine according to claim 1, wherein the printed antenna or the glass antenna is attached to the window glass. 4. The antenna device for a transceiver mounted on a construction machine according to claim 1, wherein the printed antenna or the glass antenna is provided on a rear window glass of an operator cab.