JPH0427203Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention rotates the antenna mounted on a moving object such as a vehicle in order to receive television broadcasts and FM broadcasts in an optimal manner. The present invention relates to an antenna rotation device that searches for a receiving point and fixes an antenna at the best receiving point.

<Prior Art> Conventionally, the above-mentioned antenna rotation device includes one shown in FIG. 4, for example. In the same figure,
Reference numeral 2 denotes an antenna with directivity, and 4 a rotor section, which is composed of a DC motor or the like and rotates the antenna 2. The antenna 2 and the rotor section 4 are
Attached to a moving object, for example the roof of a vehicle. The television broadcast signal received by the antenna 2 is supplied to an input terminal 8 of a power supply and control unit 6 provided in the vehicle, and is supplied to a television receiver 12 in the vehicle through an output terminal 10. . The power supply and control unit 6 is supplied with DC power from a car battery 14, and this DC power is supplied to the rotor unit 4. The power supply and control unit 6 includes
A changeover switch that changes the polarity of the DC power supplied to the DC motor of the rotor section 4 to change the direction of rotation of the antenna 2, and a push button switch that supplies DC power to the DC motor of the rotor section 4 while being pressed. However, it is provided.

Further, a switch is provided in the rotor section 4 to automatically stop the rotation of the antenna 2 when the antenna 2 rotates 360 degrees from a predetermined position.

In this antenna rotation device, the direction of rotation of the antenna 2 is determined by operating a changeover switch, and the antenna 2 is rotated once from a predetermined position by continuing to press the push button switch. After one rotation, the antenna 2 automatically stops. During this time, the television broadcast signal received by antenna 2 is transmitted to television receiver 1.
2, the receiving state of the receiver 12 changes according to the rotation of the antenna 2. Memorize the rotational position of the antenna 2 that provides the best reception during one rotation of the antenna 2, and after completing one rotation, operate the changeover switch to switch the antenna 2.
Reverse the direction of rotation, press the push button switch to rotate the antenna 2 in the opposite direction, and then release the push button switch to stop the antenna 2 at the position for the best reception.

<Problems to be solved by the invention> However, with this antenna rotation device, when radio waves from a broadcasting station arrive from near a predetermined position,
There was a problem. In other words, in order to confirm that this is the best reception point, it is necessary to find the position where the reception was the best after the television receiver's reception became the best, and only when the reception became worse. It can be confirmed that this is the best reception point. However,
If the best reception point is located near the reference position, the antenna 2 will automatically stop before the reception gets worse, making it impossible to confirm the best reception point.

<Means for solving the problem> In order to solve the above problem, this invention is designed so that the antenna rotates more than 360 degrees from the reference position and stops automatically. a rotating shaft that rotates the rotating shaft, a motor that rotates the rotating shaft, a normally closed switch that is interposed between the motor and the power source and is opened when the operating section is pressed, and a normally closed switch that is provided to rotate together with the rotating shaft. It has an arm, and a switch opening member that is provided so as to cross a predetermined position on a circumference drawn by the rotation of a rotating shaft, and one end of which is rotatably provided. A normally closed switch is provided at a position where the switch opening member presses the operating section of the normally closed switch when the switch is rotated by a predetermined angle after contacting the opening member.

<Operation> According to this invention, the rotating shaft rotates in a direction in which the arm moves away from the switch release member from a predetermined position,
The antenna rotates. Eventually, when the antenna rotates once and returns to a predetermined position, the arm comes into contact with the switch release member, and the switch release member rotates together with the arm by a predetermined angle. At this time, the switch opening member presses the operating portion of the normally closed switch to open the normally closed switch. This allows the antenna to
Rotate more than 360° from the specified position and stop.

<Effects> As described above, according to this invention, the antenna can be rotated more than 360 degrees from a predetermined position, so when radio waves are arriving from almost a predetermined position direction, the antenna can be rotated as soon as it passes through the best receiving point. Since the antenna can be rotated to a receiving point that is not the best, the location of the best receiving point can be quickly determined. Therefore, you can immediately set the antenna at the best reception point by reversing the antenna from a position that has been rotated more than 360 degrees.

<Embodiment> Figs. 1 and 2 show a rotor section of an embodiment of this invention, and 20 is a rotating shaft, which is rotatably supported by a bearing (not shown). For example, an antenna (not shown) having the same directivity as the antenna 2 shown in FIG. 4 is attached to the shaft 20.
are combined. A worm wheel 22 is attached to the rotating shaft 20, a worm 24 is engaged with the worm wheel 22, and the worm 24 is connected to a DC motor 26. Therefore, when the DC motor 26 is energized, the rotating shaft 20
rotates.

An arm 28 extending downward is provided on the lower surface of the worm wheel 22 . Also,
An annular body 32 provided at one end of a plate-shaped switch opening member 30 is loosely fitted onto the rotating shaft 20 . Therefore, the switch opening member 30 is rotatable around the rotating shaft 20. In addition, the switch release member 3
The other end of the arm 28 is located outward from the arm 28. Therefore, the switch opening member 30 traverses the circumference that the arm 28 traces as the worm wheel 22 rotates. Note that the switch opening member 30 is
It is in contact with the substrate 34.

On the board 34 are two micro switches 3.
6, 38 are provided. These micro switches 36 and 38 are each configured as a normally closed switch, and operating parts 40 and 42, which open their contacts when pressed, are provided so as to face each other with the switch opening member 30 in between. . A switch release member 30 is attached to these operation parts 40 and 42.
Micro switches 36 and 38 are arranged on the substrate 34 in a positional relationship such that the tips of the micro switches 36 and 38 can come into contact with each other. Note that in order for the switch opening member 30 to abut the operating section 40 and then the operating section 42, the switch opening member 30 needs to be rotated by θ.

FIG. 3 is a circuit diagram of this embodiment, in which one end of the DC motor 26 is connected to a contact 44a of a changeover switch 44.
The other end of the DC motor 26 is connected to a contact 48a of another changeover switch 48 through a series circuit of a microswitch 36 and a diode 46.
It is connected to the. A series circuit of the micro switch 38 and a diode 50 is connected to the series circuit of the micro switch 36 and the diode 46. Note that the diode 50 is connected in reverse to the diode 46.

One contact 44b of the changeover switch 44 is connected to the positive electrode of the DC power supply 54 via a push button switch 52, and the other contact 44c is connected to the positive electrode of the DC power supply 54.
connected to the negative electrode of. Further, one contact 48b of the changeover switch 48 is connected to the negative electrode of the DC power source 54, and the other contact 48c is connected to the positive electrode of the DC power source 54 via the push button switch 52. The changeover switches 44 and 48 are interlocked, and the contact 44a of the changeover switch 44 is connected to the contact 44.
When the changeover switch 48 is in contact with the contact 48b, the contact 48a of the switch 48 is in contact with the contact 48b, and when the contact 44a is in contact with the contact 44c, the contact 48a is in contact with the contact 48c. Note that at least the changeover switches 44 and 48 are provided in the power supply and control section as in the conventional one shown in FIG. 4, and a car battery is used for the DC power supply 54.

Now, the switch release member 30 is shown at 30 in FIG.
a, the arm 28 is in the position 28a, and the contact 4 is in the position shown in FIG.
4a is in contact with the contact 44b, and the contact 48a is in contact with the contact 48b. In this state, if you keep pressing the push button switch 52, the DC power supply 54, the push button switch 52, and the changeover switch 4 will be turned off.
4. DC current flows through the DC motor 26, micro switch 36, diode 46, and changeover switch 48, causing the rotating shaft 20 and worm wheel 22 to rotate in the direction shown by arrow A in FIG. 2, and the antenna also rotates in the direction shown by arrow A in FIG.
Rotate in the direction. At this time, the switch release member 3
0 does not rotate because the annular body 32 at one end is loosely fitted to the rotating shaft 20. Eventually, arm 28
When the arm 28 rotates once, it comes into contact with the switch opening member 30 at the position indicated by 30a, and the switch opening member 30 rotates together with the arm 28, and when it rotates by θ, the switch opening member 30 rotates to the position indicated by 30b, It comes into contact with the operating section 40 . As a result, the contacts of the microswitch 36 are opened, the power supply to the motor 26 is stopped, and the rotation of the antenna is stopped. Note that since the diode 50 is reverse biased at this time, the micro switch 38 is closed, but no current flows to the motor 26 via the micro switch 38 and the diode 50. In this way, the best reception point is found while the antenna is rotating by 360° + θ.
In particular, when radio waves from a broadcasting station are coming from the direction of extension of the dotted line indicated by the symbol 30a, the direction indicated by the number of points indicated by the symbol 30a is the best receiving point because the antenna has been rotated by θ. Become clear. Then, the contacts 44a, 48a of the changeover switches 44, 48 are switched to contact the contacts 44c, 48c, and the push button switch 52 is kept pressed.
As a result, the DC power supply 54, the push button switch 5
2. Current flows through the changeover switch 48, the diode 50, the microswitch 38, the DC motor 26, and the changeover switch 44, the DC motor 26 reverses, and the antenna rotates in the opposite direction. While rotating in the opposite direction, when the antenna returns to the best reception point, the push-button switch 52 is released to stop energizing the DC motor 26 and stop the antenna.

Note that when the rotating shaft 20 is rotated in the direction opposite to the arrow A while the arm 28 is in the position shown by the symbol 28b and the switch release member 30 is in the position shown by the symbol 30b, the arm 28 rotates once. When it comes into contact with the switch opening member 30, the switch opening member 30 rotates by θ together with the arm 28, comes into contact with the operation part 42 of the micro switch 38, and the DC motor 2
6 stops. That is, the antenna rotates by 360°+θ in either direction.

In the above embodiment, the arm 28 is provided on the lower surface of the worm wheel 22, but it may be attached to a disc provided on the rotating shaft 20 separately from the worm wheel 22. Further, the switch opening member 30 is provided so that the annular body at one end thereof is loosely fitted to the rotating shaft 20, but the annular body provided at one end thereof is loosely fitted to a shaft body provided separately from the rotating shaft 20. It may be provided so that

[Brief explanation of the drawing]

Figure 1 shows one of the antenna rotation devices based on this invention.
A front view of the rotor section of the embodiment, FIG. 2 is A of FIG.
-A sectional view taken along line A, FIG. 3 is an electric circuit diagram of the same embodiment, and FIG. 4 is a schematic configuration diagram of a conventional antenna rotation device. 20...Rotating shaft, 26...DC motor, 28...
...Arm, 30...Switch release member, 36,3
8...Micro switch (normally closed switch), 40,
42...Operation unit, 54...DC power supply.

Claims (1)

[Scope of utility model registration request] A rotating shaft coupled to the antenna, a motor for rotating the rotating shaft, a normally closed switch interposed between the motor and the power supply and opened when the operating section is pressed, and a switch configured to rotate together with the rotating shaft. and a switch opening member that is provided so as to cross a predetermined position on a circumference drawn by the rotation of the rotation axis, and one end of which is rotatably provided. , an antenna characterized in that the normally closed switch is provided at a position where the switch opening member presses the operation part of the normally closed switch when the arm rotates by a predetermined angle after contacting the switch opening member. Rotating device.