JPS5932202A - Device for controlling extension and contraction of motor antenna - Google Patents

Abstract

PURPOSE:To attain the extension and contraction with good accuracy for an antenna element even at an optional intermediate extended position, by forming the titled controller with an electric circuit only. CONSTITUTION:When a power supply ON detecting circuit 11 or a power supply OFF detection circuit 12 is operated, a motor initial driving pulse generating circuit 16 applies a pulse signal to an upward motor driving circuit 18 and a downward motor driving circuit 19. In elevating the antenna element upward, the driving circuit 18 only is made active by an upward command signal from an up/down set circuit 17 and a motor M is rotated. When a pulse from a PG obtained from the rotation of the motor is detected, a motor holding circuit 22 is operated and the active state of the driving circuit 18 is continued. When the pulse of the PG is counted 23 and reaches a set value, the output of the holding circuit 22 releases the active state of the driving circuit 18 and the motor M is stopped. Further, this is the same in case of the descending. Thus, the antenna element is extended and contracted with good accuracy at any optional intermediate position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an expansion/contraction control device for a motor antenna installed in an automobile or the like, and more particularly to a control means for turning on/off the energizing power source of a motor for driving an antenna element expansion/contraction.

As a conventional control means of this type, there is a well-known control means composed of a clutch and a limit switch. In other words, this control means causes the clutch to slip when the load on the simoke exceeds a predetermined value (clutch force) due to the drive cord of the antenna element stopping running when the antenna element completes extension or contraction, and operates after the clutch starts to slip. The limit switch is configured to turn off the energizing power to the motor.

However, since the conventional control means as described above is of a mechanical structure, the period from the completion of the expansion/contraction operation of the antenna element to the activation of the limit switch is not constant and is relatively long.

During this period, that is, during the period when the clutch is slipping, an excessive current continues to flow in the motor in a pulsating manner.

As a result, sparks are likely to occur at the contacts of the limit switch that cuts off this current, and failures such as seizure of the contacts are likely to occur. Therefore, the above-mentioned conventional device had the drawback of lacking reliability.

Further, in the conventional telescopic control device described above, the control mechanism itself has to be complicated and large.

The present invention does not have such conventional drawbacks, and can quickly and appropriately cut off the motor power supply to stop the rotation of the eta upon completion of expansion and contraction of the antenna element, and can also move the antenna element to any intermediate expansion position. To provide an expansion/contraction control device for a motor antenna that can be made compact and lightweight with a simple configuration and can be accurately expanded/contracted.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a block diagram showing the configuration of an expansion/contraction control device that is an embodiment of the present invention. A in FIG. This will be discussed later. Reference numeral B designates a motor antenna unit having a motor M for driving a drive cord for lifting and lowering the rod antenna, and a mechanical element (not shown) for lowering the row of rod antenna elements, such as a drum for feeding and storing the drive cord. The power terminal of the motor M is connected to the output terminals of the upper motor drive circuit 18 and the lower motor drive circuit 19 of the control circuit A through lead wires l1 and l2, and is connected to the rotor shaft of the motor. An output lead l3 of the rotational pulse generator PG is connected to an input terminal of an amplifier 20 in a control circuit A, which will be described later. In this embodiment, this rotating pulse generator PG uses a well-known reflective photocoupler, and has two bright and dark parts at equal intervals in the circumferential direction of the rotor shaft (not shown) of the motor M. It is arranged to generate two pulses per rotation.

Note that the rotating pulse generator PG is not limited to the above-mentioned photocoupler; for example, it may be configured to detect the oscillating current generated each time the brush of the DC motor passes the two electrodes of the commutator of the armature. However, various rotary pulse generators themselves have been proposed, and since they are not the gist of the present invention, detailed explanations thereof will be omitted.

Next, the control circuit A, which is the main part of this embodiment, will be explained. The terminal 10 is a terminal connected so that the power supply voltage Vc appears when the power switch of a communication device such as a radio receiver is turned on, and a power-on detection circuit 11 is connected to this terminal 10.
The power-off detection circuit 12 is connected to the power-off detection circuit 12, and the power-on detection circuit 11 has a rising differentiation circuit composed of, for example, a capacitor and a resistor. When a power supply voltage appears at the terminal 10, the rising edge is differentiated and a positive trigger is generated. Send a signal.

The power-on detection circuit 12 similarly has a falling differential circuit consisting of a capacitor and a resistor, an inverter for polarity reversal, etc., and when the electric current voltage appearing at the terminal 10 disappears, it differentiates the falling voltage. Then, the polarity is inverted and a positive trigger signal is sent out.

The power supply voltage Vc is applied to the power-on detection circuit 11 via a push-button raising switch SW1 at a suitable time, so that the detection circuit 11 can be operated at a suitable time. Further, the power-off detection circuit 12 is provided with an installation potential via a push-button lowering switch SW2, so that the detection circuit 12 can be activated at a proper time.

The output trigger signal S1 of the power-on detection circuit 11 is input to the power-on detection circuit 11 and the power-on detection rotating motor control pulse generation circuit 13 by OR logic, and the output trigger signal S1 of the power-on detection circuit 11 is supplied to the delay gate circuit 14, The output trigger signal S2 is supplied to the delay gate circuit 15.

When the control pulse generation circuit 13 is triggered by the output trigger signal S1 of the power-on detection circuit 11 or the output trigger signal S2 of the power-off detection circuit 120, the control pulse generation circuit 13 generates a one-shot pulse with a predetermined pulse width as a control pulse S3 and outputs it to the delay gate circuit 14. .15 and are sent to a motor initial drive pulse generation circuit 16, a counter reset circuit 25, and a motor rotation holding circuit 22, which will be described later. Note that the pulse width of the control pulse S3 of the control pulse generation circuit 13 is set in advance to a predetermined pulse width so that a motor drive circuit, which will be described later, will not malfunction.

The delay gate circuit 14 is connected to the motor control pulse generation circuit 13.
When the control pulse S3 is given as a gate signal, the trigger signal S1 from the power-on detection circuit 11 is slightly delayed, and the delayed output signal S4 is supplied to the rise/fall setting circuit 17 as a rise command signal.

The delay gate circuit 15 is connected to the motor control pulse generation circuit 13.
When the control pulse S3 is given as a gate signal, the trigger signal S2 from the power-off detection circuit 12 is slightly delayed, and the delayed output signal S5 is supplied to the rise/fall setting circuit 17 as a fall command signal.

The rise/fall setting circuit 17 is constituted by, for example, an RS flip-flop, and when supplied with the rise command signal S4 from the delay gate circuit 14, the rise/fall setting circuit 17 sets the rise direction corresponding to the extension direction of the Ambuna element to the rise direction motor drive circuit 18. When the signal S7a is sent out and the descending command signal S5 is supplied from the delay gate circuit 15, a descending setting signal S7b corresponding to the reduction force surface of the antenna element is sent to the descending direction motor drive circuit 19.

The motor initial drive pulse generation circuit 16 is triggered at the falling edge of the control pulse S3 from the motor control pulse generation circuit 13, and outputs an output signal as an initial drive pulse S6 to an upward direction motor drive circuit 18 and a downward direction motor drive circuit 19. supply each.

The upper one-way motor drive circuit 18 and the one-lower direction motor drive circuit 19 are composed of, for example, a bridge circuit in which transistors are bridge-connected, and this drive circuit 18.19
When the initial drive pulse S6 is supplied from the motor initial drive pulse generation circuit 16, either the drive circuit 18 or 19 is activated in accordance with the setting signal S7a or S7b of the rise/fall setting circuit 17, and the motor M is activated. Drive to rotate in a predetermined direction. Incidentally, since the initial drive pulse S6 is output with a slight delay from the above-mentioned rise and fall setting signals S7a and S7b, the motor drive circuits 18 and 19 are not activated at the same time by the initial drive pulse S6.

On the other hand, the rotational pulse SPG from the rotational pulse generator PG obtained by the rotation of the motor M is amplified to a predetermined level by an amplifier 20, and then converted into DC by a rotational pulse detection circuit 21, and then sent to a motor rotation holding circuit 22, which will be described later. Supplied.

This motor rotation holding circuit 22 is in an ON state during the period when it is supplied with the DC output from the rotation pulse detector 21, and transmits the holding output signal S22 to the upward direction motor drive circuit 1.
8 and the downward direction motor drive circuit 19.

Therefore, even if the initial drive pulse 86 from the motor initial drive pulse generation circuit 16 is cut off after a predetermined period of time (the width of the pulse S6 is about 100 m5), the motor drive circuits 18 and 19 continue using the holding output signal S22. The device is kept in working condition. Note that the motor rotation holding circuit 22 is turned off when the rotation pulse SPG is removed from the rotation pulse generator PG and the DC output from the rotation pulse detector 21 is cut off. Further, when the control pulse S3 of the motor control pulse generation circuit 13 and the output signal from the rotation measurement counter 23 described below are applied, the operation is prohibited even if the rotation pulse detection circuit 21 supplies a DC output.

The rotation measurement counter 23 is a binary counter that measures the amount of rotation of the motor M using the rotation pulse SPG amplified to a predetermined level by the amplifier 20 as a clock input. When the rotation of the motor M reaches the set value given to the terminal 24, the force sensor 23 supplies a rotation stop signal S23 to the motor rotation holding circuit 22, cuts off the holding output S22, and stops driving the motor M. In addition to prohibiting the clock from being set manually. Further, the rotation measurement counter 23 is reset-controlled by a reset signal S25 from a counter reset circuit 25, and when this counter reset circuit 25 is given a control pulse S3 from the motor control pulse generation circuit 13, it communicates with the terminal 10'. It is triggered when a machine power off signal is given, and supplies a reset signal S25 to the measurement counter 23.

The operation of this embodiment configured as described above is shown in Figure 2 (
The explanation will be based on A) and (B).

FIGS. 2(A) and 2(B) are timing charts explaining the operation of this embodiment. FIG. 2(A) is a diagram showing the input/output timing of each block when the antenna element is extended, and FIG. ) is a diagram showing the input/output timing of each block when the antenna element is reduced.

First, the operation and operation for intermediately extending the antenna element will be described. When the power source of a communication device such as a radio or transceiver is turned on at time t1 in FIG. The generated trigger signal S1a is manually input to the motor control pulse generation circuit 13 and the delay dart circuit 14. The motor control pulse generation circuit 13 is triggered at approximately the same time t1 by this trigger signal S1a, and outputs a control pulse S3 having a predetermined pulse width. Due to this control pulse S3, a rise command signal S4 is manually input from the delay gate circuit 14 to the rise/fall setting circuit 17 at time t2, which is delayed by time Tb from time t1.

The rise/fall setting circuit 17 changes the rise setting output S7a from the LOW level to the H level at time t2 in response to the rise command signal S4.
IGH (inverted to level, rising direction motor drive circuit 18
A HIGH level rise setting output S7a is supplied to set the rotation direction of the motor M to be in the middle length (rise) direction of the antenna element.

On the other hand, the control pulse S3 activates the motor initial drive pulse generation circuit 16 at a time t corresponding to the falling edge of the control pulse S3.
3, the motor initial drive pulse generation circuit 1
6 to the initial drive pulse S6 to the upper row direction motor trunk circuit 1.
8 and a downward direction motor drive circuit 19. This initial drive pulse S6 causes the rise/fall setting circuit 17 to
Only the upward direction motor rotation circuit 18 to which the IGH level increase setting output S7a is applied becomes active, and outputs the upward direction rotational drive signal S8 to the motor M through the lead wire l1. Motor M receives this rotational drive signal S8
The antenna element is initially driven in the extending (rising) direction by the antenna element, and the antenna element is extended through the drive cord.

Also, due to the rotation of this motor M, a rotation pulse generator PG
Two rotational pulses SPG are generated per rotation of the motor M, and are amplified to a predetermined level by the amplifier 20 through the lead wire l3.

Note that this rotation pulse SPG occurs or disappears with a slight delay from time t3 or time t4 due to the rotation delay and stop delay of the motor M. The rotation pulse SPG amplified to a predetermined level by the amplifier 20 is sent to a rotation pulse detection circuit 21,
The rotation pulses SPG supplied to the rotation measurement counter 23 and input to the rotation pulse detection circuit 21 are converted into a DC voltage output signal S21, and the motor rotation holding circuit 22
supplied to The motor rotation holding circuit 22 is turned on by the DC output signal S21 from the rotation pulse detection circuit 21, and outputs the motor rotation holding signal S22 to the upward direction motor drive circuit 18 and the downward direction motor drive circuit 19 to drive the upward direction motor. The ac-dig state of the circuit 19 is maintained continuously. Note that the holding circuit 22 receives at least the control pulse S3 from the motor control pulse generation circuit 13.
It will not turn on while the power is on. With this motor rotation holding signal S22, the motor M, which was initially driven by the initial drive pulse S6 from the initial drive pulse generation circuit 16, continues to rotate in the direction in which the antenna element extends, and the rotation pulse generator PG generates a rotation pulse. SP
Generate G continuously.

On the other hand, the rotation pulse S supplied to the rotation measurement counter 23
PG is counted as a clock input.

Note that the rotation measurement counter 23 receives a reset signal S2 from the counter reset circuit 25, which is triggered by the control pulse S3 of the motor control pulse generation circuit 13 at time t1.
5, it is in a reset state in advance. In this way, the rotation pulse SPG, that is, the tachometer of the motor M, changes at time t4.
When the set value corresponding to the intermediate extended position of the antenna element is reached, the rotation measurement counter 23 outputs a rotation stop signal S23.
is output and supplied to the motor rotation holding circuit S22, and inhibits clock input of the rotation pulse SPG. This rotation stop signal S23 causes the motor rotation holding circuit S2 to
2 is turned off, the active state of the upward direction motor drive circuit 18 is released, and the rotation of the motor M is stopped.

Incidentally, at this time, the motor M is delayed at time t4 due to the rotation stop delay.
It will stop a little later than that.

Therefore, when the rotation of the motor M is stopped, the antenna element stops extending at the intermediate extended position, making it possible to receive a predetermined broadcast wave.

Next, a brief description will be given of the type of desired broadcast wave (for example, FM wave) and the operation and operation when fully extending the antenna element when the transmitting/receiving electric field strength is weak. Since the power source of the communication device is already in the on state, at time t5 in FIG. 2(A), the rise switch SW1 is pressed to turn it on. Then, the power-on detection circuit 11 detects the power supply voltage Vc again and supplies the signal S1b to the motor control pulse generation circuit 13 and the delay gate circuit 14.

Thereafter, the motor M rotates in the direction in which the antenna element extends through a series of operations similar to those described above in response to the trigger signal S1b. Then, when the antenna element reaches the full extension position at time t6, the drive cord stops running, causing the motor M to be in a locked state, and the rotation pulse generator PG stops generating the rotation pulse SPG.

Due to the disappearance of the rotation pulse SPG, the motor rotation holding circuit S22 receives the rotation pulse SPG from the rotation pulse detection circuit 21.
21 is cut off, the active state of the upward direction motor drive circuit 18 is released, and the drive current to the motor M is cut off.

In this case, for convenience of explanation, it is assumed that the motor M stops rotating before the rotation stop signal S23 from the rotation measurement counter 23 is supplied to the motor rotation holding circuit 22.

Next, a case will be described in which the antenna element in the slightly extended position as described above is reduced (lowered) to an intermediate extended position.

At time t11 in FIG. 2(B), when the down switch SW2 is pressed and turned on while the power supply of the communication device is in the on state, the ground potential is momentarily applied to the power off detection circuit 12.
A trigger signal S2b is supplied from this off detection circuit 12 to a motor control pulse generation circuit 13 and a delay gate circuit 15. This trigger causes the motor control pulse generation circuit 13 to be triggered at approximately the same time (t11) by the signal S2b.
Control pulse S3 is output. By applying this control pulse S3 to the delay gate circuit 15, the descending command signal S2 of the power-off detection circuit 12 is supplied to the ascending/descending setting circuit 17 at time t12 with a slight delay time, and the setting circuit 17 is set to the descending mode. Set to . As a result, a descending setting signal S7b is sent from the ascending/descending setting circuit 17 at time t12, and this is transmitted to the descending direction motor drive circuit 1.
given to 9.

On the other hand, at the falling time t13 of the control pulse S3, the initial drive pulse generator 16 sends out the same as in the case described above, and this pulse is applied to the ascending and descending direction motor drive circuits 18 and 19. Therefore, the downward direction motor drive circuit 19 becomes active and rotates the motor M in the downward direction. The rotational holding of the motor M and the stopping operation by the counter 23 when the antenna element is lowered to the intermediate position are exactly the same as those described above, and everything is stopped at time t14.

Next, a case will be described in which the transmitter is also turned off when the antenna element is in the fully extended or intermediately extended position.

When the communication device power is turned off at time t15 in FIG. 2(B), the power off detection circuit 12 detects this and outputs a trigger signal S2h. Hereinafter, the above-mentioned lowering switch S
The motor M rotates in the downward direction through a series of operations similar to those when W2 is turned on.

On the other hand, since the power supply voltage Vc from the terminal 10' is cut off, the counter reset circuit 25 resets the rotation measurement counter 23.
to remain in a reset state.

As a result, the rotation measurement counter 23 does not count rotations even if the rotation pulse SPG of the motor M is input.

Therefore, when the antenna element is in the fully contracted position, that is, completely housed in the vehicle body, the drive cord stops running, causing the motor M to be locked, and the generation of the rotation pulse SPG is stopped. By stopping the generation of the rotation pulse SPG, the motor rotation holding circuit 22 is turned off in the same way as when the antenna element is fully extended as described above, and the drive current to the motor M is cut off at time t16.

In the above embodiment, the rotation pulses sent out from the rotation pulse generator attached to the motor M, for example, a pulse generator using a reflective photocoupler, are counted by the rotation measurement counter 23, and the counted value is calculated. When the set value is reached, the rotation of the motor M is stopped. Therefore, if the set value is set to a predetermined value, for example, 1/2 of the fully extended state, the motor M will automatically stop when the antenna element reaches the intestine extended position, and the antenna element will be in the intermediate extended state. Furthermore, since the motor M is configured to maintain rotation only while the rotation pulse is being obtained, the motor M automatically stops rotating when the antenna element reaches a fully extended state or a fully contracted state.

Specifically, the following expansion and contraction operations can be performed.

- When the radio receiver installed in the car is powered on, the rod antenna element automatically rises, and when it reaches the specified intermediate position, it automatically stops and is held at the intermediate position.

(2) If the rise switch SW7 is turned on when the rod antenna element is at a specific intermediate position, the antenna element will rise further and automatically stop when it reaches the rise completion position.

(2) If the lowering switch SW2 is turned on when the rod antenna element is at the completed raising position, when the rod antenna element reaches the specified intermediate position, it will automatically stop and be held at this position.

(2) If the power switch of the receiver is turned off when the rod antenna element is in the raised position, it will move downward and automatically stop when it reaches the lowered position.

As described above, according to this embodiment, the antenna element is automatically raised or lowered by turning on and off the power of the communication device, and in particular, the rotation measurement counter 23 allows the antenna element to be precisely set at a specific intermediate position. I can do it. Furthermore, when the reception strength is weak, the antenna element can be fully extended by operating the switch SW7.

Note that in this embodiment, the operation of the motor rotation holding circuit 22 is prohibited by the control pulse S3 from the control pulse generation circuit 13, so if, for example, the lowering switch SW2 is turned on during the raising operation of the rod antenna element, ,
In other words, even if the raising and lowering settings are switched while the motor is being driven, excessive current can be prevented from flowing through the motor M. Therefore, it is possible to safely turn on and off the power switch of the radio receiver, etc., and turn on and off the up/down switches SW1 and SW2. In the above embodiment, an example was described in which the motor drive circuits 18 and 19 were configured by a bridge connection of transistors, but for example, as shown in FIG. 3(A), a transistor Tr1 or Tr
2 and a coil RY1 or RY2 may be connected and arranged to switch and control the motor M in the upward and downward directions, and as shown in FIG. 3(B), the motor M may be controlled by a transistor drive circuit Tr5. The relay circuit RY may be driven by a relay circuit RY which is driven by a setting signal S7 of a rising/lowering setting circuit J7.

Assuming that no slip occurs in the antenna element drive mechanism, the setting value of the rotation visual counter 23 is the total length of the antenna element, r is the effective shaft radius of the motor rotating section, and P is the number of pulses per rotation of the motor. Then, the set value CNT is obtained by:

As explained above, according to the present invention, when the power switch of the communication device to which the antenna element is connected is turned on and off, or the lowering operation switch is turned on and off, the on/off state is detected by the detection circuit, and the on/off state is detected. Accordingly, the ascending or descending direction of the antenna element is set, and a motor initial drive pulse of a predetermined width is sent out based on the on/off detection output, and the motor drive circuit becomes active.

As a result, the motor starts rotating in the set direction. When the motor starts rotating, a rotation pulse is sent out, and during the period when this rotation pulse is being obtained, the motor drive circuit is held in an active state by the motor rotation holding means. Therefore, the motor continues to rotate.

The rotation pulses are counted by a counter, and when the counted value reaches a set value, the holding function of the motor rotation holding means is lost and the motor is stopped.

Therefore, if the above set value is set at the intermediate extended position of the antenna element, the antenna element will stop at the intermediate extended position. If an on or off signal is detected again at the intermediate extended position, the motor starts rotating again. When the antenna element reaches a fully extended or fully contracted state, the motor stops and rotation pulses cannot be obtained, so the holding means is reset. , the power supply to the motor is cut off. Therefore, the motor drive stop response time when the antenna element is fully expanded and retracted is shortened, and since a clutch is not used as in the past, it is small, thin and lightweight, and there is no mechanical noise caused by the engagement and disengagement of the clutch, resulting in excellent transmitting and receiving sensitivity. It is possible to provide an excellent motor antenna expansion/contraction control device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a telescopic control device according to an embodiment of the present invention, and FIGS. 2(A) and 2(B) are diagrams explaining the operation of the embodiment of FIG. Figure (A) is an input/output timing chart of each block when the antenna element is extended, Figures 3 (A) and (B) are input/output timing charts of each block when the motor antenna element is contracted, and Figure 3 ( A) and (B) are circuit diagrams showing other embodiments of the motor drive circuit. DESCRIPTION OF SYMBOLS 11... Power-on detection circuit, 12... Power-off detection circuit, 13... Motor control pulse generation circuit, 14, 15
... Delay gate circuit, 16... Motor initial drive pulse generation circuit, 17... Up/down setting circuit, 18... Upper row direction motor drive circuit, 19... Downward direction motor drive circuit, 23... Rotation Measurement counter, 22...Motor rotation holding circuit, PG...Rotation pulse generator.

Claims (1)

[Claims] An on/off detection circuit that detects the on/off status of a power switch or a telescoping operation switch in a communication device to which the antenna element is connected, and a setting circuit that sets the extension or contraction direction of the antenna element based on the detection output signal of this on/off detection circuit. and a motor initial drive pulse generation circuit that sends out a motor initial drive pulse of a predetermined width based on the output signal of the on-off detection circuit; A motor drive circuit that supplies an extension drive signal or a reduction drive signal to the antenna drive motor according to the expansion/contraction setting output of the setting circuit, and a motor drive circuit that supplies an extension drive signal or a reduction drive signal to the antenna drive motor according to the expansion/contraction setting output of the setting circuit, and a motor drive circuit that supplies the antenna drive motor with a rotation amount according to the drive signal of this drive circuit. means for generating a rotational pulse; a motor rotation holding circuit that maintains the motor drive circuit in an active state for a period when the rotation pulse is applied; and a motor rotation holding circuit that counts the rotation pulse as a clock input until a predetermined count value is reached. A counter for disabling the active state of the motor drive circuit caused by the motor rotation holding circuit.