JPH10215109A - Motor-driven antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven antenna device for not amplifying sound on a radio receiver side and not generating an unpleasant feeling by noise while elevating an antenna element. SOLUTION: The antenna element 10 is elevated and lowered by the drive control of a motor 14 and signals received by the antenna element 10 are amplified in an amplification means 26 and transmitted to the radio receiver side. A Geneva contact point switch 18 is connected to the motor 14 and the drive control of the motor 14 is performed by it. The Geneva contact point switch 18 is provided with an AMP switch to be closed when the antenna element 10 reaches an elevation end, a driving voltage +B is supplied to the voltage terminal of the amplification means 26 through the AMP switch and the amplification means 26 is turned to an operation state by closure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-driven antenna device in which sound is not loudspeaked from a radio receiver while an antenna element is being raised, and is loudspeaked when the antenna element reaches a rising end. It is.

[0002]

2. Description of the Related Art In a conventional motor-driven antenna device for a vehicle for receiving an AM / FM signal, when an antenna element is extended and ascended, the length becomes about 1 m. Therefore, there is a problem that the long antenna element is easily damaged and other objects are easily damaged. Also, it is not very desirable in design that an antenna element as long as about 1 m protrudes from the vehicle body.

Under these circumstances, the present applicant has already proposed an antenna element using a helical coil, whose effective length is about 1 m but whose physical length is as short as about 15 cm. With this short antenna element, the FM signal can resonate and no particular deterioration in antenna characteristics is observed,
With respect to the AM signal, the level of the received signal is reduced by the shorter physical length. In order to compensate for the small received signal level, the stray capacitance of the external load impedance is reduced as much as possible, so that the external impedance is increased to suppress the attenuation of the received signal.

[0004]

SUMMARY OF THE INVENTION In the antenna element having a short physical length proposed by the present applicant, sufficient practical characteristics are obtained when the antenna element is at the rising end. However, when the antenna element is not ascending to the rising end and is in the middle of ascending, the physical length acting as an antenna is further shortened, and the level of the AM reception signal is extremely small. Therefore, if this AM reception signal is amplified on the radio receiver side, there is a possibility that loud noise is generated and discomfort is caused. Further, when the antenna element reaches the rising end, in a structure in which the base end of the antenna element elastically contacts the feeding member, a reception signal is not given to the amplification means until the antenna element reaches the rising end, and the amplification means There is a risk of outputting noise.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a motor driven antenna apparatus in which a received signal is not amplified by a radio receiver until an antenna element reaches a rising end. With the goal.

[0006]

In order to achieve the above object, a motor driving antenna device of the present invention raises and lowers an antenna element by controlling driving of a motor, and amplifies a signal received by the antenna element by an amplifying means. A motor-driven antenna device for amplifying and outputting, comprising a control unit for setting the amplifying unit to an operating state when detecting that the antenna element is at a rising end.

Also, a motor drive antenna device for raising and lowering an antenna element by drive control of a motor, amplifying a signal received by the antenna element by an amplifying means, and outputting the amplified signal, wherein the amplified signal of the amplifying means is output. A muting means for muting a signal path to be muted, and a control means for canceling muting by the muting means when detecting that the antenna element is at the rising end.

A motor drive antenna device for raising and lowering an antenna element by drive control of a motor, amplifying a signal received by the antenna element by an amplifying means, and outputting the amplified signal. Signal path opening / closing means for conducting / interrupting a signal path to be connected, and control means for switching the signal path opening / closing means from interruption to conduction when detecting that the antenna element is at the rising end.

A motor drive antenna device for raising and lowering an antenna element by drive control of a motor, amplifying a signal received by the antenna element by an amplifying means, and outputting the amplified signal, wherein the antenna element is at a rising end. A control means for outputting a detection signal to the radio receiver when detecting the fact may be provided.

[0010] Further, it is possible to detect that the antenna element is at the rising end by opening and closing a Geneva contact switch that rotates while being connected to the motor.

Further, one contact switch of the Geneva contact switch which is connected to the motor and rotates is opened when the antenna element rises to the rising end, and the drive voltage is cut off by opening the contact switch. The driving of the motor may be stopped, and the potential difference between the terminals of the opened contact switch may be detected to detect that the antenna element is at the rising end.

[0012]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a configuration diagram of a first embodiment of the motor driving antenna device of the present invention. FIG.
Shows an example of a Geneva contact switch used in FIG.
(A) is a rising edge, (b) is rising or falling, (c)
Indicates the state of the falling edge.

In FIG. 1, a rack cord 12 on which a rack is engraved extends downward from a base end of an antenna element 10 having a short physical length using a helical coil.
A pinion gear 16 connected to a motor 14 meshes with the rack of the rack cord 12. Therefore, the motor 14
, The antenna element 10 is controlled to move up and down from the lower end shown by the solid line in FIG. 1 to the upper end shown by the broken line in FIG. Further, a Geneva contact switch 18 is connected to the motor 14, and the contact switch controls the driving of the motor 14 for raising or lowering the antenna element 10. Then, the received signal is supplied to the amplifying means 26 via the power supply member 28 elastically contacting the base end of the antenna element 10 at the rising end, and the amplified output is output to the radio receiver side via the signal path.

Here, for the Geneva contact switch 18,
This will be described with reference to FIG. An appropriately shaped terminal plate 18b made of a conductor is integrally provided on a Geneva gear 18a made of an insulating resin connected to the motor 14 by a gear. A common terminal 18c, an UP terminal 18d, a DOWN terminal 18e and an AMP terminal 18f are provided corresponding to the terminal plate 18b. The contact switch is controlled to open and close according to the position of the antenna element 10 by the shape of the terminal plate 18b and the positional relationship between the terminals 18c to 18f. More specifically, the common terminal 18c is always in elastic contact with the terminal plate 18b, the UP terminal 18d is apart from the terminal plate 18b at the position where the antenna element 10 is at the rising end, and is in elastic contact with the terminal element at other positions.
The N terminal 18e is separated from the terminal plate 18b at the position where the antenna element 10 is at the lower end, and resiliently contacts at other positions.
f is configured such that the antenna element 10 is elastically contacted with the terminal plate 18b at the rising end and is apart from the other at the rising end. Thus, the UP switch 20 is formed between the common terminal 18c and the UP terminal 18d, the DOWN switch 22 is formed between the common terminal 18c and the DOWN terminal 18e, and the AMP switch 24 is formed between the common terminal 18c and the AMP 18f. You.

Referring back to FIG. 1, a circuit structure for controlling the driving of the motor 14 will be described. When the power switch on the radio receiver side is turned on, a voltage is applied to one end of the coil 30a of the relay 30, and the other end of the coil 30a is grounded. By driving the coil 30a, the two relay contacts 30b and 30c are switched. The common terminal of the relay contact 30b is connected to the other grounded end of the coil 30a, and the normally closed contact is connected to the normally open contact of the other relay contact 30c and the common terminal 18c of the Geneva contact switch 18. The normally open contact of the relay contact 30b is connected to the normally closed contact of the other relay contact 30c and to one input terminal of the motor 14. The drive voltage + B is applied to the common terminal of the other relay contact 30c. The other input terminal of the motor 14, DOW the DOWN switch 22 via the diode D ₁ in the forward direction
Is connected to the N terminal 18e, it is connected to the UP terminal 18d of the UP switch 20 through a diode D ₂ in the reverse direction. Also, the AMP terminal 18 of the AMP switch 24
f is connected to the voltage terminal of the amplification means 26.

In such a configuration, the contact state of each switch shown in FIG. 1 is a state in which the antenna element 10 is at the lower end, and no voltage is applied to the amplifying means 26, which is a non-operating state. Here, when the power switch is turned on on the radio receiver side, a voltage is applied to the coil 30a of the relay 30 to be driven, and the relay contacts 30b and 30c are switched. Then, the drive voltage + B is changed to a state where the UP switch 20 and the diode D are closed except for the relay contact 30c and the rising end.
The input is applied to the other input terminal of the motor 14 via the _{second terminal 2} , one input terminal is grounded via the relay contact 30b, and the motor 10 is driven to rotate in a direction to raise the antenna element 10. When the antenna element 10 reaches the rising end, U
The P switch 20 is opened and the drive voltage to the motor 14 is increased.
The application of B is cut off, and the driving of the motor 14 is stopped. At the same time, the AMP switch 24 is closed from the open state, and the drive voltage + B is applied to the voltage terminal of the amplifying means 26 to be brought into the operating state.

When the power switch on the radio receiver side is turned off and the voltage application to the coil 30a of the relay 30 is stopped, the relay contacts 30b and 30c are switched back to the original state, and the driving voltage + B is changed to the relay contact. 30c
It is applied to one input terminal of the motor 14 via, DOW the other input terminal of the closed state except the falling edge and diodes D ₁
Grounded via the N-switch 22 and the relay contact 30b, the motor 10 is driven to rotate in a direction to lower the antenna element 10. At the same time, the switching of the relay contact 30c cuts off the driving voltage + B to the amplifying means 26, and the amplifying means 26 is brought into a non-operating state. And the antenna element 1
When 0 reaches the falling end, the DOWN switch 22 is opened, the driving voltage + B to the motor 14 is cut off, and the driving of the motor 14 is stopped.

As described above, in the first embodiment, when the antenna element 10 is at the rising end, the amplifying means 26 is activated, so that the level of the received signal is still small when the antenna element 10 is rising. If the base end of the antenna element 10 does not elastically contact the power supply member 28, the sound is not amplified on the radio receiver side, and there is no possibility that discomfort due to noise is caused.

FIG. 3 shows the configuration of a second embodiment of the motor-driven antenna device of the present invention, and is a diagram mainly showing components different from those of the first embodiment. In the second embodiment shown in FIG. 3, the AMP terminal 18f of the AMP switch 24 is connected to one end of the coil 40a of the control relay 40 of the amplifying means 26 and the common terminal of one relay contact 40b. The other end of the coil 40a is grounded. The normally open contact of the relay contact 40b is connected to the voltage terminal of the amplification means 26, and the normally closed contact is not connected to any of them. Also, the other relay contact 40c
Is connected to the signal path to the radio receiver side, the normally open contact is connected to the output terminal of the amplification means 26, and the normally closed contact is grounded.

In this configuration, when the antenna element 10 reaches the rising end and the AMP switch 24 is closed, the driving voltage + B is applied to the coil 40a and the relay contact 40
b and 40c are switched. Then, the relay contact 40
The drive voltage + B is applied to the amplifying means 26 via b, and the amplifying means 26 is brought into an operating state. Also, the relay contact 40
The output terminal of the amplifying means 26 is connected to the signal path to the radio receiver side via c. When the antenna element 10 is rising, the AMP switch 24 is in an open state, the amplifying means 26 is in a non-operating state, its output terminal is cut off from the signal path, and the signal path is muted. State. Here, the relay contact 40
c is a muting means for muting the signal path, and also a signal path opening / closing means for conducting / cutting off the signal path.

FIG. 4 shows the configuration of a third embodiment of the motor-driven antenna device according to the present invention, and is a diagram showing components different from those of the first embodiment. In the third embodiment shown in FIG. 4, the AMP switch 24 in the first embodiment is not provided in the Geneva contact switch 18. In the third embodiment, AMP
Instead of the switch 24, the opening of the UP switch 20 that opens when the antenna element 10 reaches the rising end is electronically detected, and in response to this detection, the drive voltage + B is applied to the amplifying means 26 to bring it into the operating state. It is like that. More specifically, the common terminal 18c of the Geneva contact switch 18 is connected to the emitter of the PNP transistor Tr, and its collector is connected to the voltage terminal of the amplifier 26. The transistor Tr has an emitter and a base connected to a resistor R.
Is connected via a _1, the base is further resistor R ₂ and UP terminal 18 in the forward direction of the diode UP switch 20 via the D ₃
d.

In such a configuration, the antenna element 10
During this rise, the UP switch 20 is closed, there is no potential difference between the emitter and the base of the transistor Tr, and the transistor Tr is non-conductive. And then it reaches the rising end,
When the UP switch 20 is opened, a potential difference is generated between the common terminal 18c forming the UP switch 20 and the UP terminal 18d. Then, this potential difference causes the resistances R ₁ , R ₂
, A potential difference is generated between the emitter and the base of the transistor Tr, and conduction between the emitter and the collector is established.
As a result, the driving voltage + B is applied to the amplifying unit 26 via the transistor Tr, and the amplifier unit 26 enters an operation state.

FIG. 5 shows the configuration of a fourth embodiment of the motor-driven antenna device of the present invention, and is a diagram showing components different from those of the third embodiment. In the embodiment shown in FIG.
The collector of the transistor Tr is appropriately connected to the radio receiver via a cable or the like. And amplifying means 2
The voltage terminal 6 is the common terminal 1 of the Geneva contact switch 18.
8c. Then, when the power switch is turned on on the radio receiver side and the relay contact 30c is switched, the amplifying means 26 is in the operating state. On the radio receiver side, when the transistor Tr is turned on and a voltage as a detection signal is applied, the low-frequency signal amplifying unit and the like are configured to operate.

Even with such a configuration, the antenna element 10
Reaches the rising end and the loudspeaker starts only after the detection signal is transmitted to the radio receiver side.
While the level of the received signal is small while 0 is increasing, no loudspeaking is performed, and no noise is loudspeaked.

In the above embodiment, the control of the amplifying means 26 is performed in connection with the Geneva contact switch 18 which is connected to the motor 14 and controls the driving of the motor 14. However, the present invention is not limited to this. Any structure of detecting means for detecting that 10 is at the rising end may be used. For example, a limit switch, an electromagnetic switch, a photoelectric switch, or the like that operates when the antenna element 10 rises to the rising end may be used, or a pressure switch that is pressed by the antenna element 10 at the rising end to detect this may be used. good. Further, an actuator that detects the movement of the motor 14 that drives the antenna element 10 to the rising end may be used. In the above description, the amplifying unit 26 is operated in a state where the antenna element 10 is at the rising end, but the base end of the antenna element is connected to the feeding member 28 even during the rising. If the received signal level is sufficiently obtained and the antenna element 10 is located near the rising end, the amplifying unit 26 may be set to the operating state or the like. Further, although the present invention has been made to solve the problem of the antenna element 10 having a short physical length, it can be applied to an antenna element of about 1 m in a conventional extended state. When applied to the antenna element of about 1 m, it is useful to prevent noise or the like generated by driving the motor from being amplified on the radio receiver side.

[0026]

As described above, since the motor driving antenna device of the present invention is constituted, the following special effects can be obtained.

In any of the motor driven antenna devices according to the first to third aspects, the reception signal is not transmitted to the radio receiver until the antenna element reaches the rising end, and it is detected that the signal is at the rising end. Since the reception signal is transmitted only when the reception is performed, the radio receiver does not amplify the low-level reception signal together with the noise, and does not cause discomfort due to the noise.

Further, in the motor driven antenna device according to the fourth aspect, when the antenna element reaches the rising end, the detection signal is transmitted to the radio receiver side. By setting the low frequency signal amplifying means and the like to the operating state, noise caused by the low level of the received signal is not amplified.

In the motor driving antenna device according to the fifth aspect, the operation of the amplifying means is connected to the Geneva contact switch connected to the motor and controlling the driving of the motor.
By providing a contact switch for controlling non-operation and the like, the configuration of the control means can be simplified.

Further, in the motor driven antenna device according to the present invention, the potential difference between the terminals of the contact switch of the Geneva contact switch which opens when the antenna element reaches the rising end is detected, and the operation of the amplifying means is determined. Since the control means for controlling the operation and the like is configured, the structure of the Geneva contact switch is simple, and the potential difference between the terminals can be detected by a simple electronic circuit.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of a motor-driven antenna device of the present invention.

2A and 2B show an example of a Geneva contact switch used in FIG. 1, wherein FIG. 2A shows a rising end, FIG.
(C) shows the state of the falling end.

FIG. 3 is a diagram illustrating a configuration of a second embodiment of the motor-driven antenna device according to the present invention, and mainly illustrates components different from the first embodiment.

FIG. 4 is a diagram showing a configuration of a third embodiment of the motor-driven antenna device according to the present invention, and showing components different from those of the first embodiment.

FIG. 5 is a diagram showing a configuration of a fourth embodiment of the motor-driven antenna device according to the present invention, and showing components different from those of the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Antenna element 14 Motor 18 Geneva contact switch 20 UP switch 22 DOWN switch 24 AMP switch 26 Amplifying means 30, 40 Relay 30b, 30c, 40b, 40c Relay contact Tr transistor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuichi Kagoshima 1112 Shinnohara, Tomioka City, Gunma Prefecture Inside the Yokoo Tomioka Plant

Claims (6)

[Claims] 1. A motor-driven antenna device which raises and lowers an antenna element by driving control of a motor, amplifies a signal received by the antenna element by an amplifying means, and outputs the amplified signal, wherein the antenna element is at an ascending end. A motor driving antenna device comprising: a control unit for setting the amplifying unit to an operating state when detecting the fact. 2. A motor-driven antenna device which raises and lowers an antenna element by controlling driving of a motor, amplifies a signal received by the antenna element by an amplifying means and outputs the amplified signal, and outputs an amplified signal of the amplifying means. And a control unit for canceling the muting by the muting unit when it detects that the antenna element is at the rising end. Antenna device. 3. A motor-driven antenna device which raises and lowers an antenna element by drive control of a motor, amplifies a signal received by the antenna element by an amplifying means and outputs the amplified signal, and outputs an amplified signal of the amplifying means. Signal path opening / closing means for conducting / cutting off a signal path to be turned on, and control means for switching the signal path opening / closing means from cut-off to conduction when detecting that the antenna element is at the rising end. Motor driven antenna device. 4. A motor-driven antenna device for raising and lowering an antenna element by drive control of a motor, amplifying a signal received by the antenna element by an amplifying means, and outputting the amplified signal, wherein the antenna element is at a rising end. A motor driving antenna device comprising a control means for outputting a detection signal to the radio receiver side when detecting the fact. 5. The motor-driven antenna device according to claim 1, wherein the opening and closing of a Geneva contact switch that rotates in connection with the motor detects that the antenna element is at a rising end. A motor-driven antenna device characterized in that: 6. The motor-driven antenna device according to claim 1, wherein one of the Geneva contact switches rotating in connection with the motor is opened when the antenna element is raised to a rising end. In this manner, the drive voltage is cut off by opening the contact switch to stop driving the motor, and the potential difference between the terminals of the opened contact switch is detected to detect that the antenna element is at the rising end. A motor-driven antenna device configured to detect.