JPS5854940Y2 - rat expulsion device - Google Patents

Description

[Detailed explanation of the invention] This invention emits ultrasonic waves directly to humans or
This invention relates to a rat expulsion device that effectively intimidates and drives away rats that indirectly cause harm.

Conventionally, ultrasonic rat repelling devices intermittently emit ultrasonic waves of a certain frequency to intimidate rats.

If this device is used constantly, the mouse becomes insensitive to ultrasonic waves of the above-mentioned frequency, and the frightening effect of this frequency is reduced.

In addition, in order to eliminate this drawback, ultrasonic waves are continuously varied within a predetermined frequency range, but the electrical circuit configuration becomes complicated and expensive, and the generation changes of ultrasonic waves are periodic. There were drawbacks such as a reduction in the intimidation effect.

This invention uses a simple circuit configuration to asynchronously generate ultrasonic waves of two frequencies, so that rats do not become accustomed to the ultrasonic waves and the intimidating effect is not diminished.

As shown in the drawing, the mouse expelling device of this invention has two oscillation circuits 1 and 4 with different oscillation frequencies, for example, 20 KHz.
1 and 30 KHz 4, two electroacoustic exchangers 3 and 6 that generate ultrasonic waves composed of speakers such as piezoelectric diaphragms and tweeters driven by the outputs of the oscillator circuits 1 and 4, and Two different square wave generation circuits 2, 5, for example 6
Circuit 2 with pulse width 2 seconds at intervals of seconds and pulse width 1 at intervals of 9 seconds
It consists of a second circuit 5.

The two oscillation circuits 1 and 4 generate oscillation signals B and B' at their outputs only during the period when the respective rectangular pulses A and A' of the rectangular wave generation circuits 2 and 5 are applied, and the electroacoustic transducers 3, 6
Generates more ultrasonic waves.

The oscillation frequencies of the two oscillation circuits 1 and 4 are selected to be 15 to 5 QKHz, centered around 20KHz, which rats hate most.

Since the oscillation circuits 1 and 4 and the rectangular wave generation circuits 2 and 5 described above can all be constructed from known circuits, they have been explained using block diagrams in this invention.

The rat expelling device configured in this manner intermittently emits ultrasonic waves of two types of frequencies that are disliked by rats.

Since each intermittent period is different, in the synthesized state, a non-periodic intermittent ultrasonic wave is generated, and a synthesized sound of two frequencies is also generated, making the ultrasonic generation condition complicated. This can be done by generating ultrasonic waves at random intervals, making it difficult for rats to become accustomed to the emitted ultrasonic waves.

As explained above, the rat expelling device of this invention has a simple structure and can emit non-periodic ultrasonic waves that do not weaken the effect of intimidating rats, so it is highly effective in practice.

[Brief explanation of the drawing]

The drawing shows a block diagram of an embodiment of the rat expelling device of this invention. 1.4...Oscillation circuit, 2,5...Square wave generation circuit,
3, 6... Electroacoustic transducer, A, A... Rectangular pulse of the rectangular wave generation circuits 2, 5, output oscillation signal. B. B...Oscillation circuit 1゜

Claims (1)

[Scope of utility model registration request] two oscillation circuits that have a threatening effect on rats and have different oscillation frequencies; two square wave generation circuits that modulate the oscillation frequencies of the oscillation circuits with rectangular waves each having a different period;
A rat expulsion device characterized by comprising a pair of sound generators driven at each of the above modulation frequencies.