JPH0644167Y2 - Electric telescopic antenna drive controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a drive control device for an electric telescopic antenna, which is widely used, for example, as an antenna for an automobile.

[Conventional technology]

Generally, this type of electric telescopic antenna drive control device turns on the operation switch etc. to extend and retract the antenna element.
If it is turned off, the DC power is supplied to the motor with a predetermined polarity, the motor rotates forward or backward, and the antenna element expands or contracts accordingly. The mechanism works and the motor side and the antenna side are separated, and immediately after that, the upper limit switch or the lower limit switch is turned off, and the power supply to the motor is cut off.

[Problems to be solved by the device]

The conventional electric telescopic antenna drive controller having the above structure has the following problems. That is, the upper limit switch and the lower limit switch are generally composed of mechanical elements such as leaf spring contacts. Further, the drive means for turning the limit switch ON or OFF is also constituted by a pure mechanical mechanism such as a rotary step mechanism interlocked with a motor. Therefore, the movable parts such as the rotary step mechanism and the limit switch are easily worn or damaged. If such wear or damage occurs, for example, in the drive force transmitting portion between the rotary step mechanism and the limit switch, the limit switch will not operate or will malfunction, and the DC power supply will be cut off properly when the expansion and contraction of the antenna element is completed. There is a problem that you can not do it. In addition, since the limit switch function, that is, the function of shutting off the motor power when the expansion or contraction of the antenna element is completed, has a large number of constituent parts, the cost is high and the reliability is high. There were many problems in terms of.

Therefore, an object of the present invention is to appropriately shut off the motor power supply when the antenna element is completely extended or contracted without the risk of limit switch function failure due to mechanical wear or damage of moving parts. It is possible to provide a transmission and expansion antenna drive control device that can achieve stable operation over a long period of time, and can be reduced in cost and improved in reliability.

[Means for Solving the Problems]

In order to solve the above problems and achieve the object, an electric telescopic antenna drive control device of the present invention uses a motor provided so as to rotate in a forward or reverse direction by being supplied with a DC power source, and a rotational force of the motor. Means for extending or contracting the telescopic antenna element, a displacement body that is displaced by the expansion or contraction operation of the insulating telescopic antenna element by this means, and a side path of the displacement path of the displacement body. And the Hall element disposed in the Hall element and facing each other at a constant interval with respect to the Hall element, and a magnetic bias is applied to the Hall element so that the Hall element is normally turned on, and the Hall element is moved along the displacement path. When the displacement body is displaced to a position corresponding to the extension completion position or the contraction completion position of the antenna element, a non-contact state is formed between the Hall element and the magnetic bias means. In interposed OFF the Hall element
A magnetic shield attached to the displacement body so as to operate, and a semiconductor switching circuit that cuts off power supply to the motor when the Hall element is turned off by the magnetic shield.

[Action]

 As a result of taking the above means, the following operational effects are obtained.

(A) As an antenna element expansion / contraction information detecting means for detecting the completion of expansion or contraction of the antenna element to cut off the motor power, that is, a limit switch function, a hall element, a magnetic bias means, a magnetic element Since magnetic detection means consisting of a shield etc. is adopted, the antenna element side and the limit switch side are in a completely non-contact state, and the conventional mechanical driving force transmission means is interposed between them. Presents the state of not doing. Moreover, since the semiconductor switching circuit is used as the limit switch itself, so-called non-contact is realized. Therefore, no mechanical wear or damage of the driving force transmitting means or the mechanically movable portion of the mechanical contact portion, which has been a problem in the related art, occurs at all, and troubles resulting from this do not occur. Thus, stable operation can be expected over a long period of time, and the number of mechanical parts can be significantly reduced, so that cost reduction and reliability improvement can be achieved.

(B) When the antenna element is displaced to a position corresponding to the extension completion position or the contraction completion position, the magnetic shield attached to the displacement body is inserted between the hall element and the magnetic bias means, and the hall element is turned off. Since it is configured to operate, the operation of the hall element from ON to OFRF is extremely accurately performed. Incidentally, for example, in the case where a magnetically responsive switch such as a reed switch is configured to turn on when a permanent magnet attached to the displacement body approaches, the magnetic influence of the permanent magnet on the reed switch is accompanied by the displacement amount of the displacement body. While the magnetic shielding effect by the magnetic shield suddenly occurs when the displacement body reaches the position corresponding to the extension completion position or the contraction completion position of the antenna element, its magnetic effect is reduced. Rapid (0N
To OFF). As a result, the Hall element is turned off.
The operation is performed stably, the operation timing becomes constant, and the variation is small. Therefore, the motor power supply can be cut off stably and accurately when the extension or the reduction of the antenna element is completed.

〔Example〕

FIG. 1 is a diagram showing the configuration of an embodiment in which the present invention is applied to an electric telescopic antenna for automobiles. In FIG. 1, reference numeral 1 denotes an on-vehicle battery, and a DC power source + B supplied from the on-vehicle battery 1 is smoothed by a smoothing circuit 2 including a diode D and a capacitor C, and then supplied to the circuit described below.

Reference numeral 3 denotes an antenna expansion / contraction control switch, which is a power switch of the radio, a switch interlocked with the power switch, or a switch manually operated. When this switch 3 is turned on to listen to a radio broadcast or the like, extension drive control of an antenna element (not shown) is automatically performed. That is, when the switch 3 is turned on, the exciting coil 4c of the relay 4 is energized, and the pair of switching contacts 4a and 4b of the relay 4 are switched from the solid line state to the broken line state.
By doing so, the DC power source + B is connected to the UP side terminal of the relay contact 4a through a first semiconductor switching circuit 11 described later.
The fuse 5 to the motor 6 to the UP-side terminal of the relay contact 4b to the ground are supplied to the path to rotate the motor 6 forward. Therefore, along with this, the antenna element (not shown) expands. When the extension of the antenna element is completed, a clutch mechanism (not shown) is activated to disconnect the motor side from the antenna side, and immediately after that, the semiconductor switching circuit 11 as the upper limit switch is operated by the hall element 21 described later. In response to, the power is turned off and the power supply to the motor 6 is cut off.

Switch 3 to stop listening to radio broadcasts, etc.
When set to F, reduction drive control of the antenna element (not shown) is automatically performed. That is, when the switch 3 is turned off, the energization of the exciting coil 4c of the relay 4 is cut off, and the pair of switching contacts 4a and 4b of the relay 4 are switched from the broken line state to the solid line state. Then, the DC power supply + B passes through a second semiconductor switching circuit 12 described later, and the DN side terminal of the relay contact 4b-motor 6-fuse 5-relay contact 4a.
The motor 6 rotates in the reverse direction by being supplied to the path from the DN side terminal to the ground. Therefore, the antenna element (not shown) is reduced accordingly. When the reduction of the antenna element is completed, a clutch mechanism (not shown) is activated to disconnect the motor side and the antenna side, and immediately after that, the semiconductor switching circuit 12 as the lower source limit switch is
In response to a hall element 22 which will be described later, it is turned off and the power supply to the motor 6 is cut off.

Next, means for exhibiting the limit switch mechanism in the above-mentioned operation, that is, when the extension or the reduction of the antenna element is automatically detected, the semiconductor switching circuit 11 or 12 is turned off to turn on the motor power. The means for cutting off will be described.

In FIG. 1, reference numeral 7 is a rotating body as an example of the displacement body in the present invention. The rotating body 7 is connected via a connecting means 8 such as a reduction gear mechanism of the motor 6. Therefore, the motor 6 rotates in accordance with the rotation of the motor 6, and its rotation angle is changed according to the expansion / contraction operation position of the antenna element. A magnetic shield 25 having a U-shaped cross section, for example, as shown in FIG. 2, is attached to a part of the periphery of the rotating body 7. 180 ° around the rotating body 7
At a different position, a pair of Hall elements 21 and 22 are arranged at an appropriate distance from the outer peripheral surface of the rotating body 7. Permanent magnets 23 and 24 for magnetic bias are arranged to face the hall elements 21 and 22 at predetermined intervals. Thus, the Hall elements 21 and 22 are magnetically biased so as to always be in the ON state.

As described above, the Hall elements 21 and 22 are always in the ON state, but when the antenna element is displaced to the position corresponding to the extension completion position or the contraction completion position, the rotating body that rotates accordingly. Magnetic shield attached to 7
24 is between the Hall element 21 and the magnetic bias permanent magnet 23,
Alternatively, since the Hall element 22 and the magnetic bias permanent magnet 24 are inserted in a non-contact state, the magnetic influence on each Hall element 21, 22 is cut off, and each Hall element 21 or 22 is turned off. It is configured. ON-O of these Hall elements 21 and 22
ON / OFF of the semiconductor switching circuits 11 and 12 depending on FF
The operation is controlled.

That is, the semiconductor switching circuits 11 and 12 are switching circuits including transistors TR1 and TR2 connected in Darlington connection, bias resistors R1 to R3, and a diode d, respectively, and the power supply to the motor 6 is controlled by the ON-OFF operation thereof. It is configured as follows. Thus, when the hall element 21 or 22 is turned off, the semiconductor switching circuits 11 and 12 are turned off accordingly, and the power supply to the motor 6 is stopped.

3 (a) and 3 (b) are explanatory views of the operation of the Hall element of this embodiment. Focusing now on the operation when the antenna element is extended, as shown in (a) of the figure, at the time of starting the extension operation of the antenna element, the hall element 21 receives the magnetic bias H1 from the permanent magnet 23 for magnetic bias. It is in the ON state and outputs the output "1". Therefore, the semiconductor switching circuit 11 is turned on. And the same figure (b)
As shown in, when the extension operation of the antenna element is completed, the Hall element 21 is in the OFF state because the magnetic bias H1 from the magnetic bias permanent magnet 23 is magnetically shielded by the magnetic shield 25, and the output “0” is output. Is sent. Therefore, the semiconductor switching circuit 11 is turned off and the power supply to the motor 6 is cut off.

The action when the antenna element is reduced is basically the same as the action described above. Therefore, its explanation is omitted.

According to this embodiment described above, the following operational effects can be expected.

As the antenna element expansion / contraction small information detecting means for demonstrating the function of shutting off the motor power supply by detecting the completion of expansion or contraction of the antenna element, that is, the limit switch function, hall elements 21, 22, permanent magnet bias Since magnetic detection means consisting of magnets 23, 24, magnetic shield 25, etc. is adopted, there is a completely non-contact state between the antenna element side and the limit switch side, and there is no mechanical contact between them. It exhibits a state in which there is no intervening driving force transmission means. Moreover, since the semiconductor switching circuits 11 and 12 are used as the limit switches themselves, so-called non-contact is realized. Therefore, the driving force transmitting means and the mechanically movable portion of the mechanical contact portion, which have been a problem in the past, are not worn or damaged at all, and no troubles are caused by them. Thus, stable operation can be expected over a long period of time, and the number of mechanical parts can be significantly reduced, so that cost reduction and reliability improvement can be achieved.

When the antenna element is displaced to a position corresponding to the extension completion position or the contraction completion position, the magnetic shield 25 attached to the rotating body 7 is provided between the Hall element 21 and the magnetic bias permanent magnet 23, or the Hall element 22. And the permanent magnet 24 for magnetic biasing, and the Hall elements are configured to be turned off.
The operation of 1,22 from ON to OFF will be performed extremely accurately. By the way, in the case where a magnetically responsive switch such as a reed switch is configured to turn on when a permanent magnet attached to a displacement body such as a rotating body approaches, the magnetic influence of the permanent magnet on the reed switch causes the displacement body to move. The magnetic shield 25
The magnetic shielding effect due to abruptly occurs when the rotating body 7 reaches a position corresponding to the extension completion position or the contraction completion position of the antenna element, so that the magnetic influence thereof suddenly changes (from ON to OFF). . As a result, the Hall elements 21 and 22
The OFF operation is performed stably, the operation timing becomes constant, and the variation is small. Therefore, the motor power supply can be cut off stably and accurately when the extension or the reduction of the antenna element is completed.

The present invention is not limited to the above embodiment. For example, although the rotating body 7 is illustrated as the displacement body in the above embodiment, the displacement body is not limited to this and may be a linear displacement body. Also, the magnetic sensitive element is turned off and the switching circuit is turned off when the extension or reduction of the antenna element is completed, but the magnetic sensitive element is turned on when the extension or reduction of the antenna element is completed. The switching circuit may be turned off. Of course, various modifications can be made without departing from the scope of the present invention.

[Effect of device]

According to the present invention, there is no risk of the limit switch function failure due to wear or damage of mechanical moving parts,
Upon completion of extension or contraction of the antenna element,
It is possible to provide an electric telescopic antenna drive control device that can cut off the motor power source appropriately, can expect stable operation over a long period of time, and can reduce cost and improve reliability.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention, FIG. 2 is a diagram showing a configuration of a main part of the same embodiment, and FIGS. 3 (a) and 3 (b) are operation of a Hall element of the same embodiment. FIG. 1 ... In-vehicle battery, 2 ... Smoothing circuit, 3 ... Expansion / contraction control switch, 4 ... Relay, 6 ... DC motor, 7 ... Rotating body, 11, 12 ... First and second semiconductor switching circuits, 20
...... Magnet, 21,22 …… Hall element, 23, 24 …… Permanent magnet for magnetic bias, 25 …… Magnetic shield, 30 …… Reed switch, 31, 32 …… 1st, 2nd ...... contact, 33 …… Common contact.

Claims (1)

[Scope of utility model registration request] 1. A motor provided with a DC power supply for normal rotation or reverse rotation, means for expanding or contracting an extendable antenna element using the rotational force of the motor, A displacement body provided so as to be displaced along with the expansion or contraction operation of the telescopic antenna element, a hall element disposed on the side of the displacement path of the displacement body, and a constant gap from the hall element. And a magnetic bias means that applies a magnetic bias so as to always turn on the Hall element, and the displacement body that moves along the displacement path and corresponds to the extension completion position or the contraction completion position of the antenna element. When the Hall element is displaced to the position to be inserted, it is inserted in a non-contact state between the Hall element and the magnetic bias means, and the Hall element is OF
A magnetic shield attached to the displacement body for F operation, and a semiconductor switching circuit that cuts off power supply to the motor when the Hall element is turned off by the magnetic shield. Electric telescopic antenna drive controller.