JPH0223083B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a timer circuit for driving an antenna expansion and contraction used in car radios and the like.

It is known that the antenna of a car radio or the like installed in an automobile is configured to be extendable and retractable using a motor, but in the past, the motor was a machine that turned on and off a forward/reverse switch using a gear cam mechanism. It is designed to be driven by a drive device based on physical means. For this reason, there was a problem that not only the mechanical mechanism part is prone to failure and reliability is low, but also the number of parts increases, making it expensive.

In order to eliminate these drawbacks, timer circuits using electrical means instead of mechanical means have been proposed.
This timer circuit controls the expansion and contraction operation of the antenna by setting the time required for the antenna to fully extend and fully contract as the operating time of the timer circuit.

Figure 1 shows the operating status of the above-mentioned timer circuit in relation to the timer time (the time when the antenna is energized), and A shows the case where the antenna is extended over its entire length L and at the same time the energization is cut off. , B
shows the case where the timer switch is turned from on to off and then turned on again at point b when the antenna is extended halfway. In this case, since the timer operation is newly started from point b, energization is continued for an extra time even if the total length L of the antenna is exceeded. Further, C shows the case where the timer switch is switched from on to off at point c, and even in this case, even if the antenna is completely reduced, the current continues for an extra period of time.

In this way, in conventional timer circuits, if the timer switch is turned from on to off in the middle of antenna expansion/contraction operation, and then turned on again, it continues to be energized for a while even if the antenna is fully extended or fully contracted. As a result, there is a problem that power is wasted and the antenna is not extended or contracted efficiently.

The present invention has been made in response to the above problems, and is configured to differentiate the overall length of the antenna by the number of pulses generated by an oscillator, and to control the expansion and contraction operation of the antenna by counting the number of pulses. An object of the present invention is to provide an antenna extension/contraction drive control device that eliminates the conventional drawbacks. Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic diagram for explaining the present invention. If the time required for full extension and contraction over the entire length L of the antenna ANT is a second, an oscillator generates n pulses in a second. By counting the number of pulses, the expansion and contraction operations of the antenna are controlled. That is, the antenna length is differentiated with respect to time (number of pulses), and the differentiated time is counted to control the expansion and contraction operation of the antenna.

FIG. 3 is a block diagram showing a timer circuit for driving the antenna to extend and retract according to an embodiment of the present invention. The timer circuit 1 is generated by a motor M for driving the antenna to extend and contract, a decoder 2 for setting an arbitrary count number, and an oscillation circuit. counter 3 for counting pulses;
A comparator 4 for comparing the output of the decoder 2 and the output of the counter 3, an oscillation circuit 5 for generating a set count number of pulses, and a motor M for driving the antenna extension/retraction controlled by the comparator 4. It includes a control circuit 6 for controlling the operation. S is the starter terminal, R is the radio terminal,
F and H are antenna switching terminals that are switched by the switch SW, and when switched to F or H,
A count number of full extension or half extension of the antenna is set for the decoder 2. , is the power terminal.

Figure 4 shows the specific configuration of Figure 3.
A is a decoder, 3A is a counter, 4A is a comparator, 5A is an oscillation circuit, and 6A is a control circuit.

The control circuit 6A includes first and second relays R _e1 ,
_Re2 includes transistors T _r1 and T _r2 for operating these relays. _S1 to _S4 are switches for setting the count according to the oscillation frequency of the oscillation circuit 5 and the antenna length.

I is an inverter, R ₁ to R ₃ are resistors, and C is a capacitor.

In the above configuration, when the radio circuit is turned on, the count number preset by the switches _S1 to _S4 depending on the switch positions of the antenna switching terminals F and H is output from the decoder 2A and added to the comparator 4A. If the radio circuit is off, 0 is output. Comparator 4A is 3 pins, 12 pins, 13 pins
It has three output pins, and an output appears on each corresponding pin according to the comparison result between the decoder 2A and the counter 3A. Since the output of the counter 3A is 0 until immediately before operation, the comparison of the outputs of the decoder 2A and the counter 3A in the comparator 4A is A>B
Therefore, the output of comparator 4A appears at pin 13 and becomes high [H] level. This turns on the transistor T _r1 of the control circuit 6A, so the first
Since the relay R _e1 operates, the motor M operates to extend the antenna.

At the same time, pin 3 of comparator 4A is low [L]
This is applied as a high level to the oscillation circuit 5A via the inverter I, so that the oscillation circuit 5A operates. The counter 3A counts the pulses generated by the oscillation circuit 5A up to a preset count number. When the pulse reaches the set count number, A=B, so comparator 4
Since the output (high level) of A changes from pin 13 to pin 3, the transistor T _r1 of the control circuit 6A is turned off and the operation of the motor M is stopped. At the same time, a high level appears at pin 3, which is changed to a low level by the inverter I, so that the operation of the oscillation circuit 5A is also stopped.

Next, when the radio circuit is turned off, the output of the decoder 2A becomes 0, while the output of the counter 3A becomes the preset count number, so the output comparison is B<
A, and the output of comparator 4A appears on pin 12. As a result, the transistor of control circuit 6A
Since T _r2 is turned on, the second relay R _e2 operates, so the motor M operates in the opposite direction to reduce the antenna.

At the same time, a low level appears at pin 3 of the comparator 4A, so the oscillation circuit 5A operates.

At this time, the counter 3A operates to subtract 0 from the preset count of pulses from the oscillation circuit 5A. When it becomes 0, A=B, so the output of the comparator 4A changes from pin 13 to pin 3, so the transistor T _r2 is turned off and the operation of the motor M is stopped. At the same time, since a high level appears on pin 3, the operation of the oscillation circuit 5A also stops.

In the oscillation circuit 5A, the pulse oscillation period can be varied by changing the values of the resistors _R1 to _R3 and the capacitor C.

In the above, the number of pulses generated by the oscillation circuit 5A is controlled to the count number set in advance by the decoder 2A, so if the timer switch is switched from on to off during the antenna expansion/contraction operation, the number of pulses up to the point of switching is being counted, so when it is turned on again, the antenna will expand and contract until the remaining count is reached. Therefore, energization is not continued for an extra period of time after full extension or full contraction.

Furthermore, it is also possible to stop the expansion and contraction operation of the antenna at an arbitrary position, such as in a two-stop antenna, without providing a switch on the antenna side. That is, a manually operated antenna can be easily changed to a fully automatic antenna, and moreover, it can be operated as a timer circuit with less error (excess energization time).

In the present invention, especially when the oscillation circuit 5A is constituted by a voltage controlled oscillator (VCO), the relationship between the control voltage V and the oscillation frequency is proportional as shown in FIG. As the oscillation frequency increases, the oscillation frequency also increases. As a result, when the count number set by the decoder is constant as described above, the pulse period time is shortened, so the timer operation time can be shortened as well. Therefore, the timer operation can be performed in proportion to the antenna operation (motor operation).

As is clear from the above description, according to the present invention, the overall length of the antenna is differentiated by the number of pulses generated by the oscillator, and the expansion and contraction operation of the antenna is controlled by counting the number of pulses. This prevents the antenna from continuing to be energized even after it is fully extended or fully contracted.

Therefore, unnecessary consumption of power can be eliminated and the antenna can be expanded and contracted efficiently.

[Brief explanation of drawings]

Figure 1 is a schematic diagram for explaining the conventional example, Figure 2 is a schematic diagram for explaining the conventional example;
5 and 5 are schematic diagrams and characteristic diagrams for explaining the present invention, and FIGS. 3 and 4 are block diagrams and circuit diagrams showing embodiments of the present invention. M...Motor for antenna expansion/contraction drive, 2,2A...
...Decoder, 3,3A...Counter, 4,4A...
...Comparator, 5,5A...Oscillation circuit, 6,6
A...Control circuit.

Claims (1)

[Claims] 1. A decoder connected to a radio circuit for setting an arbitrary count number, a counter for counting pulses generated in an oscillation circuit, and an output of the decoder and an output of the counter. It includes a comparator for comparison, an oscillation circuit that is controlled by the comparator to generate pulses of the set count number, and a control circuit that operates the antenna telescoping drive motor, and turns on the radio circuit. When this happens, the oscillation circuit and the control circuit are operated by the output of the comparator, and when the set number of pulses generated by the oscillation circuit are counted by the counter, the operation of the oscillation circuit and the control circuit is stopped. When the radio circuit is turned off, the oscillation circuit and control circuit are operated by the output of the comparator, and when the pulses generated by the oscillation circuit are subtracted by the counter from the set count number to 0, the oscillation starts. An electric antenna expansion/contraction drive control device characterized by being configured to stop the operation of a circuit and a control circuit. 2. The electric antenna telescoping drive control device according to claim 1, wherein the control circuit includes first and second relays that operate when the radio is on and off, respectively. 3. The electric antenna extension/contraction drive control device according to claim 1 or 2, wherein the oscillation circuit includes a voltage-controlled oscillator. 4. The electric antenna extension/contraction drive control device according to any one of claims 1 to 3, further comprising means for selectively setting a count number corresponding to full extension or half extension of the antenna in the decoder.