JPH0584681B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an on-vehicle receiving device that allows a vehicle to receive satellite broadcasting.

Conventional configuration and its problems Conventionally, as a device for receiving television broadcasts in a car, a diversity antenna composed of a combination of monopole antennas is attached to the roof side of the car, and this allows television broadcasts in the VHF band to be received. The device that receives the information is used.

However, with such conventional devices, there is a lot of ghost interference in urban areas and mountainous areas, making it difficult to obtain a good reception image, and in areas far from the broadcasting antenna or with mountains, etc. along the way, the electric field strength is weak. However, there were many limitations, such as poor reception conditions.

OBJECTS OF THE INVENTION An object of the present invention is to provide an in-vehicle receiving device that eliminates such conventional drawbacks, is less restricted by the reception location, and can always receive television broadcasts etc. satisfactorily in a car. That is.

Structure of the Invention In the present invention, in consideration of the characteristic of automobiles that the receiving location always changes, the automobile receives a satellite broadcasting signal that can receive direct waves well regardless of the receiving location. The receiving antenna is provided so that it can be tilted and rotated freely, and the tilting and rotation of the antenna is driven by a motor, and the reception status of the satellite broadcasting signal is detected and the antenna is always directed in the direction of the satellite. The feature is that it can be controlled to point it correctly.

DESCRIPTION OF THE EMBODIMENTS An embodiment in which the present invention is implemented for satellite television broadcast reception will be described below with reference to the accompanying drawings.

FIG. 1 shows a state in which a parabolic antenna 1 for receiving satellite television broadcasting is installed on the roof 3 of an automobile 2. In this device, a pair of bearings 4 are provided on a roof 3, between which a support member 5 for raising and lowering is rotatably supported, and a bolt 6 for adjusting inclination is rotatably provided therein. 7 is a motor for driving the support member 5 to raise and lower, and 8 is a motor for driving the bolt 6 to rotate. The support member 5 is provided with a pair of support plates 5a,
A somewhat vertically elongated through hole is provided at its tip, through which the support shaft 9 is inserted, to rotatably support the pole 10a. The base of the pole 10a is rotatably attached to a nut 11 fitted to the bolt 6.

On the other hand, a coupling box 15 is attached to the tip member of the pole 10a.
Attach the pole 10b to which is fixed rotatably,
The frame 17 of the reflector 16 of the parabolic antenna 1 is rotatably attached to the coupling box 15 by a support shaft 18. The frame 17 is provided with a weight 19 and a scale 20 for indicating the elevation angle. A support plate 21 is fixed to the pole 10a, and a motor 22 for rotating the antenna is attached to the pole 10a, so that the parabolic antenna 1 can be rotated via gears 23a and 23b. Combine box 1
A motor 24 for adjusting the elevation angle is installed inside the parabolic antenna 1 through gears 25a and 25b.
to be able to adjust the elevation angle of the 26 is arm 2
7 is the primary radiator and SHF converter attached to the parabolic antenna.

Next, the operation of the receiving apparatus configured as described above will be explained.

First, when driving a car 2, it is dangerous to have the parabolic antenna 1 up because excessive wind pressure is applied, so the parabolic antenna 1 is placed face down on the roof 3 as shown in Figure 1. keep it in condition.

Next, when the car 2 is stopped and a satellite television broadcast signal is to be transmitted, the motor 7 is operated by a switch installed inside the car to raise the support member 5, and the parabolic antenna 1 is raised as shown in FIG. .
In this state, the base of the pole 10a is adjusted to the left and right by operating the motor 8 and rotating the bolt 6 using a switch provided inside the vehicle. By controlling these two motors 7 and 8, the poles 10a and 10b are adjusted to be vertical.

4 and 5 show means for detecting whether the poles 10a, 10b are vertical. In this structure, a weight 30 is suspended inside a pole 10a via a universal joint 29, and pressure sensors 31a to 31d are provided in four directions around the weight.As shown in FIG. The outputs of the pole 10a are applied to two sets of differential amplifiers 32 and 33, and the inclination state of the pole 10a is displayed on meters 34 and 35 according to the balanced state of those outputs. For example, the meter 34 indicates the horizontal inclination of the pole 10a, and the meter 35 indicates the longitudinal inclination. Therefore, the motors 7 and 8 are adjusted so that the indications on the meters 34 and 35 are both centered, and the poles 10a and 10b are made vertical.

Next, in this vertical state, the circuit shown in FIG. 3 controls the control panel 36 with a built-in celsin motor installed inside the vehicle so that the reflector 16 of the parabolic antenna 1 is at a predetermined elevation angle. A motor 24 is operated to rotate the frame 17 relative to the coupling box 15. The angle of elevation differs depending on the region of the country, so check the manual etc. and turn the celsin motor on the control panel 36 to that angle with the knob, so that the motor 24 can be adjusted so that the parabolic antenna 1 Operate it until it reaches the desired angle, and then adjust it to reach the desired elevation angle.

Finally, the control circuit 37 provided inside the vehicle rotates the coupling box 15 around the pole 10a to rotate the parabolic antenna 1, finds the direction in which it can receive the television signal from the broadcasting satellite, and points it in the direction of maximum sensitivity. . At this time, the poles 10a, 1
It is important that 0b is vertical; if it is not vertical, the angle of elevation will change depending on the direction, so you will not be able to capture the signal well. In particular, since the vehicle body of a car is often tilted depending on the location where the vehicle is stopped, the tilt of the pole 10a is detected by the above-mentioned vertical detection means, and the pole 10 is aligned vertically regardless of the tilt of the vehicle body. It is effective to be able to adjust the

In this way, the direction of the parabolic antenna 1 is adjusted, and it may be determined whether or not the parabolic antenna 1 is correctly pointed in the direction of the broadcasting satellite by looking at the screen of the television receiver in the car. , which is very difficult to see and inconvenient.

Therefore, in this device, as shown in FIGS. 3 and 6, a circuit 38 is provided to detect the reception signal of the satellite television signal. 22 is stopped. That is, a part of the received signal from the converter 26 is taken out by the splitter 39, and as shown in FIG. 6, it is detected and amplified by the detection amplification circuit 40. The output becomes a voltage whose magnitude changes depending on the magnitude of the received signal, as shown in FIG. Adding this voltage to the peak hold circuit 41,
The maximum voltage when the parabolic antenna 1 is rotated once is memorized. Then, the parabolic antenna 1 is rotated once again, and the comparison circuit 42 compares the detected voltage at that time with the maximum voltage stored in the peak hold circuit 41, and during the rotation, the detected voltage becomes the maximum voltage stored. When the signal becomes equal to , that is, when the signal reaches a direction in which reception can be performed at maximum sensitivity, an output is generated and the control circuit 37 is controlled to stop the operation of the motor 22. Thereby, the rotation of the parabolic antenna 1 is stopped and fixed in that direction, and it can be automatically adjusted to the optimum direction very easily.

After adjusting the azimuth in this way, the peak hold circuit 41 is reset with the reset switch 43, the switch 44 is switched to the operation panel 36 side, and the same operation is repeated to adjust the elevation angle, so that the elevation angle can also be adjusted. It can be automatically adjusted to the optimal angle (the angle that provides the highest sensitivity).

Note that the most sensitive direction detection means may be other means.

Furthermore, in the devices shown in FIGS. 3 and 6, after the parabolic antenna 1 is once adjusted in a predetermined direction, the angle of elevation may change due to another person getting on the car 2, or the direction of the parabolic antenna 1 may change slightly due to wind. Even in the case where the signal received from the converter 26 becomes smaller, the comparison circuit 42 of the detection circuit 38
Since the detection output is output from the parabolic antenna 1, the control circuit 37 can be controlled again using the output, and the parabolic antenna 1 can be automatically controlled again in the predetermined highest sensitivity direction. Therefore, it is possible to always orient the parabolic antenna 1 in the optimum direction and maintain good reception conditions.

In this way, the parabolic antenna 1 can be easily and precisely adjusted towards the broadcasting satellite, and can directly receive television signals from the broadcasting satellite from anywhere in the country as long as there is no direct obstruction in front of it. be able to. Therefore, even if the user travels by car to a place, such as a mountainous area, where the radio waves of normal television broadcasts cannot reach, it is possible to view television broadcasts. Furthermore, even in urban areas, it is possible to see good television images that are not affected by ghosts caused by buildings, etc.

When viewing is finished, the motors 22 and 24 are returned to their initial states, and the support member 5 is lowered by the motor 7, so that the parabolic antenna 1 can be lowered onto the roof 3 and the vehicle can travel.

Although the above embodiments have been described using a parabolic antenna, various other antennas may be used, such as a planar microwave antenna that applies the theory of a crank-type microstrip antenna. In addition to television broadcasting, PCM is also used as a broadcast signal from broadcasting satellites.
You can also receive audio broadcasts, etc.

Effects of the Invention As described above, according to the present invention, a vehicle such as a car is provided with an antenna for receiving satellite broadcast signals that can be raised and rotated freely, and the reception sensitivity of the broadcast signal is detected to maximize the direction of the antenna. Since the configuration is configured to control the antenna in the direction of sensitivity, it is possible to directly receive signals from the broadcasting satellite and receive high-quality broadcasts no matter where the vehicle moves. It is possible to almost automatically orient the receiver in the optimum direction for maximum sensitivity, and it is possible to maintain good reception conditions at all times.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an in-vehicle receiving device according to an embodiment of the present invention with the antenna folded down, Fig. 2 is a perspective view of the antenna in the upright position, and Fig. 3 is a cross-sectional side view and block diagram of the main parts thereof. , Figures 4a and 4b are a partially cutaway perspective view and a sectional front view of an example of the tilt detection device used in the same device, Figure 5 is its circuit diagram, and Figure 6 is the circuit of the maximum sensitivity detection circuit used in the same device. 7 are output characteristic diagrams thereof. 1... parabolic antenna, 2... car, 3...
...Roof, 5... Support member, 6... Bolt, 7, 8
...Motor, 10a, 10b...Pole, 15...
...Combination box, 16...Reflector, 17...Primary radiator and converter, 22, 24...Motor, 36
... Control panel, 37 ... Control circuit, 38 ... Detection circuit, 39 ... Turnout.

Claims (1)

[Scope of Claims] 1. A first pole that is attached to a vehicle such as an automobile so that one end can be raised and lowered by a motor for tilting and tilting, and a coupling box that has a built-in motor for adjusting the elevation angle is attached to the tip of the first pole. a second pole whose other end is rotatably controlled by a rotary drive motor and rotatably coupled to the other end of the first pole; and the back surface of the reflective surface of the reflective plate of the satellite broadcast signal receiving antenna. a frame that is rotatably attached to and coupled to the coupling box by an elevation adjustment motor disposed on the coupling box; and a frame that is disposed inside the first pole and suspended via a universal joint. Circumference of the weight 4
Displays balanced signal outputs from two sets of differential amplifiers into which four outputs from the vertical state detection means are input as one set of two outputs each. a vertical state display means for controlling the raising/lowering drive motor, the rotation drive motor, and the elevation adjustment motor, respectively; and a control means for controlling the drive motor by the control means to control the movement of the pole. A part of the received signal from the satellite broadcasting signal receiving antenna, whose vertical direction, the direction of the reflector of the parabolic antenna, and the elevation angle are adjusted and controlled, is split by a splitter, and the detection voltage detected by the detection amplifier circuit is peak-holded. and a most sensitive direction detecting means for detecting the most sensitive direction by comparing with the maximum voltage stored in the comparator circuit, and the vertical state displaying means detects the vertical state of the pole driven and controlled to be vertical by the raising/lowering drive motor. to set the vertical state correctly, and when the highest sensitivity is detected by the highest sensitivity direction detection means, the rotation drive motor and the elevation angle adjustment motor, which are drive-controlled by the control means, are stopped. An on-vehicle receiving device characterized in that the direction and elevation angle of the reflector of the satellite broadcast signal receiving antenna are set to optimal positions.