JPH0741355Y2 - Bird threatening device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bird threatening device for changing the surrounding magnetic field to keep birds from approaching,
It is suitable for protecting crops from birds.

[0002]

2. Description of the Related Art As a conventional bird threatening device, a device which produces an explosion sound is well known, but it has a drawback that it causes noise pollution near a residential area.

There is another type in which a magnet is fixed to a wind turbine so that the magnet rotates together with the wind turbine to change the surrounding magnetic field. Birds are sensitive to magnetic fields, and their homing instinct is also considered to be based on this property. When a large change occurs in the magnetic field, the bird hates this and keeps away from the device. This one has the advantages that it does not generate noise and does not require power, but it has the drawback that the range of its effect is narrow and that it is ineffective in the absence of wind.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bird threatening device which does not generate noise and is not affected by wind.

[0005]

The bird-throwing device of the present invention is one in which a conducting wire is extended in a loop shape at a place where a bird is not desired to approach, and a pulsed electric current is repeatedly applied to the conducting wire. Is. It is advisable to flow the pulse current intermittently. The current supply source includes a capacitor charged from a power source through a charge choke and the conductor, a thyristor for discharging electric charge accumulated in the capacitor through the conductor, and a pulse generation circuit for sending a trigger pulse to a gate of the thyristor. Can consist of:

[0006]

When the pulse current is periodically applied to the conductor, a fluctuating magnetic field proportional to the strength of the current is generated around the conductor. The fluctuating magnetic field disturbs the sense of direction in birds, and hates this and keeps away from the conductors. If the pulsed current is applied intermittently, the bird becomes more effective in the threatening effect.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 10 is a conductive wire, and reference numeral 20 is a current supply source for supplying a current to the conductive wire 10. Conductor 10
Is spread over several fruit trees 30.

FIG. 2 shows a current supply source 20, which includes a charge choke L, a diode D2, a conductive wire 10,
The capacitor C4 and the resistor R6 are connected in series to the 12V battery B. A thyristor SCR bypasses between the conductor 10 and the resistor R6.

Reference numeral 21 is a pulse generating circuit for sending a trigger pulse to the gate of the saristar SCR. This pulse generation circuit includes two integrated circuits 22 and 22 and an R for timing.
The resistor R2 and the capacitor C2 define the pulse and the pulse time interval of the trigger pulse, and the resistor R3 and the capacitor C3 define the pulse width. As a power source for the integrated circuits 22 and 23, the battery power source B is connected to the resistor R1,
It is supplied after being stepped down by the capacitor C1.

The operation of this circuit will be described with reference to FIG. 3. When the power switch SW1 is turned on, a charging current flows from the battery B through the choke coil L to the capacitor C4. When the voltage of the capacitor C4 rises and reaches its maximum, the pulse generating circuit 21 causes the thyristor SC
A trigger pulse is sent to R and the thyristor becomes conductive. Then, the charge accumulated in the capacitor C4 becomes thyristor S.
Discharge all at once through the CR, and at this time, a large current flows through the conductor 10.

When the electric charge of the capacitor C4 decreases and the current flowing through the thyristor SCR becomes small, the thyristor turns o.
It becomes ff, and the charging current flows through the capacitor C4 again.
The choke coil L and the capacitor C4 form a DC resonance circuit, and theoretically, the capacitor C4 is charged up to twice the power supply voltage. In this way, when the capacitor C4 is charged to the power supply voltage or higher, the diode D2 blocks the reverse current flow from the capacitor C4 to the power supply side.

A diode D is provided in parallel with the thyristor SCR.
The reverse circuit composed of the resistor 3 and the resistor R5 is incorporated in order to prevent the reverse voltage from being applied to the capacitor.

When a large discharge current flows through the conductor wire 10 that has passed through the fruit tree 30, the magnetic field around the conductor wire fluctuates violently, and the bird is reluctant to approach it. In a field test, a maximum discharge current of about 1 A and a discharge cycle of 10 Hz were passed through the conductive wire 10, and the crow was successfully separated from the fruit tree.
It was also effective in getting rid of sparrows.

In order to apply a larger current to the conductor, DC-DC is provided in front of the choke L as shown by the chain line in FIG.
The converter 25 may be provided to boost the power supply voltage several times.

Since birds do not operate at night, it is preferable to incorporate a timer so that the power switch of the device is automatically turned on only during the daytime so that the battery is consumed less.

FIG. 4 shows a modification of the current supply source. A long period oscillator 26 (oscillation frequency is, for example, 1H) is provided between the pulse generation circuit 21 and the thyristor SCR shown in FIG.
z), the mode switch SW2, and the gate circuit 27.

In this circuit, when the mode switch SW2 is turned to the (1) side, the output of the pulse generating circuit 21 is sent to the gate of the thyristor SCR as it is, and the same operation as in the case of FIG. 2 is performed. When the mode switch is turned to the (2) side, as shown in FIG. 5, the output of the pulse generation circuit 21 is taken out from the output side of the gate circuit 27 only when the output of the long-period oscillator 26 is off, and this causes the thyristor SCR to operate. Is ignited, and a pulse current intermittently flows through the lead wire 10. When the electric current is intermittently applied to the conductive wire in this manner, the effect of the bird threatening effect is increased. Of course, battery consumption is also reduced. The duty ratio of the output pulse of the long period oscillator 26 can be adjusted by the potentiometer VR.

[0018]

According to the bird threatening device of the first aspect of the present invention , a conducting wire is extended in a loop at a place where the bird should be kept away , and a pulsed current is passed through the conducting wire. As it is created, the birds dislike this and keep away from it. Especially, the pulsed current was made to flow repeatedly.
, A sudden magnetic field change can be obtained, and the power consumption of the device
It can be small. This device is highly safe for humans because it creates a fluctuating magnetic field that birds dislike, rather than giving an electric shock due to electric shock, and can exert a bird-thwarting effect on a wide area around a conductor. Also,
Since only one electric wire is required for the conducting wire, the wiring work is easy and the scenery is not damaged.

According to the second aspect of the present invention, the pulse current is made to flow intermittently, which has a high bird-damaging effect and low power consumption. In the device of the third aspect, the resonance circuit is formed by the choke coil and the capacitor, and the capacitor can be charged to a voltage higher than the power supply voltage. Therefore, even when the battery is driven, a large current can flow through the conductor.

[Brief description of drawings]

FIG. 1 is an explanatory view of a usage state of a bird threatening device.

FIG. 2 is a circuit diagram of a current supply source.

FIG. 3 is a timing diagram of a current supply source.

FIG. 4 is a circuit diagram of a modified example of a power supply source.

5 is a timing diagram of the circuit of FIG.

[Explanation of symbols]

 10 Conductor 20 Current Supply Source 21 Pulse Generation Circuit B Power Supply L Charge Choke C4 Capacitor SCR Thyristor

Claims (3)

[Scope of utility model registration request] 1. A bird threatening device comprising a closed wire formed by a conducting wire (10) extended in a loop shape at a place where a bird should be kept away and a current supply source (20) for repeatedly applying a pulsed current to the conducting wire. apparatus. 2. The bird threatening device according to claim 1, wherein the current supply source intermittently applies a periodic pulse current to the conductive wire. 3. The current supply source comprises a power supply (B), a charge choke (L), a capacitor (C4) charged from the power supply through the choke and the conductor, and a charge accumulated in the capacitor. 2. The bird threatening device according to claim 1, comprising a thyristor (SCR) for discharging electricity through the conductor, and a pulse generation circuit (21) for sending a trigger pulse to the gate of the thyristor.