JPH0564482B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vehicle-mounted receiving device that allows a vehicle such as an automobile 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, it is difficult to obtain good reception images in urban areas or mountainous areas due to a lot of ghost interference, and in areas far from the broadcasting antenna or where there are mountains etc. along the way, the electrolytic strength is weak. However, there were many limitations, such as poor reception conditions.

OBJECT OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional technology, and can always receive television broadcasts well in vehicles such as automobiles without being subject to restrictions depending on the reception situation. It is an object of the present invention to provide an on-vehicle receiver that can be easily adjusted.

Structure of the Invention In view of the characteristic of vehicles such as automobiles that the receiving location always changes, the present invention is designed to allow a vehicle to receive satellite broadcasting signals that can receive direct waves satisfactorily regardless of the receiving location. The receiving antenna is installed so that it can be raised and rotated freely so as not to interfere with the running of the vehicle, and when adjusting the direction of the antenna, the antenna is placed in the direction where it can receive signals from satellite broadcasting with maximum sensitivity. By providing a display element near the antenna to indicate which direction the satellite is facing, the antenna can be easily adjusted in the direction of a predetermined broadcasting satellite.

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 its adjustment knob. A pair of support plates 8 are provided on the support member 5, and a somewhat vertically elongated through hole is provided at the tip of the support plate 8, through which a support shaft 9 is inserted, and a pole 10 is rotatably supported. Paul 1
The base of 0 is rotatably attached to a nut 11 fitted to a bolt 6. Further, a pair of rails 12 is attached to the upper surface of the roof 3 of the automobile 2 as shown in FIG. Rotatably attach to the back of the tip of No.5. This adjustment member 13 consists of two metal rods 13a, 1
3b, with threads facing in opposite directions cut in the abutting portions of the central portion, and fitted with adjustment bolts 14 to enable adjustment of the overall length.

On the other hand, a coupling box 15 is rotatably attached to the tip of the pole 10, and a frame 17 of a reflector 16 of the parabolic antenna 1 is rotatably attached to this via a support shaft 18. The frame 17 is provided with a weight 19 and a scale 20 for indicating the angle of depression.

21 is a primary radiator and SHF converter attached to a parabolic antenna by an arm 22;
23 is a bolt for preventing rotation.

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

First, when driving the car 2, it is dangerous to raise the parabolic antenna 1 because excessive wind pressure will be applied to it. Leave it upside down.

Next, when the car 2 is stopped and satellite television broadcasting is to be received, one end of the adjustment member 13 is first slid along the rail 12 and clamped into the hole 24 of the rail 12 as shown in FIG. Raise the support member 5 and raise the parabolic antenna 1 as shown in FIGS. 2, 4, and 5. In this state, by rotating the bolt 6 with the knob 7, the pole 1
Adjust the base of 0 left and right, and adjust the adjustment bolt 14
By rotating the support member 5, the angle of the support member 5 is adjusted so that the pole 10 is vertical.
Means for detecting whether the pole 10 has become vertical is shown in FIGS. 6 and 7. This is done by inserting a weight 26 into the inside of the pole 10 via a universal joint 25.
is suspended, and pressure sensors 27a are placed around it in four directions.
As shown in FIG. 7, the output of each pressure sensor 27a to 27d is applied to two sets of differential amplifiers 28 and 29, and meters 30 and 31 are used depending on the balance state of those outputs. The inclination state of the pole 10 is displayed. For example, the meter 30 indicates the horizontal inclination of the pole 10,
The meter 31 indicates the inclination in the front-rear direction. Therefore, the knob 7 and adjustment bolt 4 are adjusted so that the readings on the meters 30 and 31 are both centered, and the pole 10 is made vertical.

Next, in this vertical state, the frame 1 is moved so that the reflector 16 of the parabolic antenna 1 is at a predetermined elevation angle.
7 is rotated relative to the coupling box 15. Since the angle at which the broadcasting satellite is viewed differs depending on the area in the country, the angle of elevation is determined by checking the manual, reading the elevation angle using the weight 18 hanging vertically and the scale 19, and adjusting the elevation angle to the specified elevation angle. adjust.

Finally, the coupling box 15 is rotated around the pole 10 to rotate the parabolic antenna 1 to find the direction in which it can receive the television signal from the broadcasting satellite and to point it in the direction of maximum sensitivity. At this time, it is important that the pole 10 is vertical; if it is not vertical, the angle of elevation will change depending on the direction, making it impossible to capture the signal well. In particular, since the body of a car is often tilted depending on where it is stopped, the tilt of the pole 10 is detected by the above-mentioned vertical detection means,
It is effective to be able to adjust the pole 10 vertically regardless of the inclination of the vehicle body.

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

Therefore, in this device, as shown in FIG. 8, a circuit is provided to detect the received signal from the tuner for receiving satellite television signals, and the display element 33 is turned on when the direction is reached where the signal can be received with maximum sensitivity. This display element 33 is mounted near the parabolic antenna 1, for example, in the coupling box 15, to facilitate adjustment. That is, a part of the received signal is extracted from the tuner, detected and amplified by the detection amplification circuit 34. The output becomes a voltage whose magnitude changes depending on the magnitude of the received signal, as shown in FIG. This voltage is applied to the peak hold circuit 35, and the parabolic antenna 1 is
Memorize the maximum voltage when rotating. and,
The parabolic antenna 1 is rotated again, and the comparison circuit 36 compares the detected voltage at that time with the maximum voltage stored in the peak hold circuit 35, and during the rotation, the detected voltage becomes equal to the maximum voltage stored. When the temperature reaches the maximum sensitivity, that is, when the direction is such that reception can be received with maximum sensitivity, an output is generated and the display element 33 is turned on. As a result, the user can
All you have to do is rotate the parabolic antenna 1 while looking at the screen, and when it lights up, stop rotating the parabolic antenna 1 and fix it in that direction, making it very easy to adjust to the optimal direction.

After adjusting the azimuth in this way, reset the peak hold circuit 35 with the reset switch 37, and repeat the same operation for adjusting the elevation angle, so that the elevation angle is also set to the optimum angle (the angle at which maximum sensitivity is obtained). can be adjusted to

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

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, one end of the adjustment member 13 is again slid along the rail 12, inserted into the other hole 32 and clamped, thereby allowing the parabolic antenna 1 to fall onto the roof 3 and 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, an antenna is provided on a vehicle such as an automobile so that it can be raised and rotated freely, and when the direction of the antenna is adjusted, it can be determined that the antenna is oriented in a direction that can receive signals with maximum sensitivity. Since the display is displayed using a display element placed near the antenna, the direction of the antenna can be adjusted very easily to a specified direction, and the direct signal from the broadcasting satellite can be seen no matter where the vehicle is moving. Good reception is possible and high quality broadcast reception can be performed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an in-vehicle receiver according to an embodiment of the present invention in a state in which the antenna is folded down, FIG. 2 is a perspective view in its raised state, FIG. 3 is a cross-sectional side view in its folded state, 4 and 5 are a sectional side view and a sectional front view of the device in its raised state, FIGS. 8 is a circuit diagram of the display circuit used in the device, and FIG. 9 is its output characteristic diagram. 1... parabolic antenna, 2... car, 3...
...Roof, 5... Support member, 6... Bolt, 10...
...Paul, 11...Natsuto, 12...Rail, 1
3... Adjustment member, 14... Adjustment nut, 15...
Combined box, 16...Reflector, 17...Frame, 1
9... Weight, 20... Scale, 21... Primary radiator and converter, 24... Hole, 25... Universal joint, 26... Weight, 27a-27
d...Pressure sensor, 28, 29...Differential amplifier,
30, 31...meter, 32...hole, 33...display element, 34...detection amplifier circuit, 35...peak hold circuit, 36...comparison circuit, 37...reset switch.

Claims (1)

[Claims] 1. A vehicle is provided with an antenna for receiving satellite broadcasting signals that can be raised and rotated freely, and a vertical detection means for detecting the vertical state is provided inside the tilting member that supports the antenna, so that when adjusting the direction of the antenna, An on-vehicle receiving device characterized in that a display element is provided near the antenna to indicate that the antenna is directed in a direction where it can receive satellite broadcasting signals with maximum sensitivity.