JPS5923764B2 - ultrasonic insect repellent - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in ultrasonic insect repellents.

Ultrasonic insect repellents are known that use ultrasonic waves to drive away mosquitoes and other pests, but these known ultrasonic insect repellents are only effective when operated at fairly high sound pressure levels. Not only does it consume a lot of power and generate heat, but it also has the problem of being almost ineffective at sound pressure levels that are completely harmless to the human body, dogs and cats, other livestock, and poultry.

In addition, such ultrasonic waves are used not only to exterminate pests, but also to exterminate harmful animals such as rats and weasles.

Therefore, in addition to continuous and uniform ultrasonic waves, these harmful animal extermination devices use continuous sawtooth waves that are continuously generated with a period of several seconds to tens of seconds, or the above-mentioned sawtooth waves that are generated every other cycle. Ultrasonic waves that are frequency-modulated by intermittent sawtooth waves are used.

However, such a modulated wave or intermittent modulated wave method is
Not only does it require a complicated circuit, but it also causes greater harm to the human body, dogs, cats, other livestock, and poultry, so it cannot be applied to insect repellents that are normally used only near humans and livestock. Furthermore, even with this method, a considerably high sound pressure level is required to effectively exterminate mosquitoes and other pests, and it has been difficult to sufficiently reduce power consumption and heat generation.

However, this ultrasonic insect repellent has many advantages, such as it does not obstruct visibility or ventilation, is convenient to carry, does not require the use of open flames, and can be used in open spaces. There is.

The present invention has been made based on the above-mentioned viewpoints, and its object is to provide an ultrasonic insect repellent that operates effectively even at low sound pressure levels.

Therefore, the gist is that 0.1 to 10
Intermittently at frequencies in the range of 0.105 seconds to 0.010 seconds.
The purpose is to emit ultrasonic waves with an instantaneous sound pressure level of 50 to 100 dB or less for about 5 seconds.

With this configuration, compared to the case where ultrasonic waves of the same sound pressure level are continuously emitted, not only the insect repellent effect is further improved, but also the average sound pressure level is lowered, reducing the impact on the human body and useful plants and animals. This results in a significant reduction in power consumption and heat generation.

Hereinafter, the details of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of an ultrasonic insect repellent according to the present invention, and FIG. 2 is an electric circuit diagram thereof.

Therefore, in Fig. 1, 1 is an ultrasonic insect repellent, 2 is its casing,
3 is an ultrasonic emission window through which ultrasonic waves are emitted, 4 is a power switch, 5 is a transformer, 6 is a rectifier circuit, and 7 is a power switch.
8 is a low frequency oscillation circuit for intermittent ultrasonic waves, 8 is a high frequency oscillator circuit for generating ultrasonic waves, 9 is a switching transistor, 10
is an ultrasonic oscillator.

Therefore, in FIG. 2, when switch 4 is turned on,
The low frequency oscillation circuit 7 starts oscillating at a low frequency of around several Hz,
Switching transistor 9 is opened and closed.

Therefore, the switching transistor 9 has a frequency of 15 Hz or less,
It is preferably opened and closed at a frequency in the range of 0.1 to 10 Hz, and its conduction time is preferably in the range of 0.05 to 0.5 seconds, and its duty factor is preferably 0. The low frequency oscillation circuit 7 is configured so that the ratio is 1 to 0.25.

Therefore, when the switching transistor 9 becomes conductive, the high frequency oscillation circuit 8 starts immediately, and the high frequency oscillation circuit 8 starts to generate a frequency of 30 to 50 KHz.
The ultrasonic oscillator 10 is operated to generate ultrasonic waves.

This ultrasonic oscillator 10 is placed inside the casing 2 immediately after the ultrasonic emission window 3, so that the ultrasonic waves are radiated to the outside from the ultrasonic emission window 3.

This emission of ultrasonic waves is performed intermittently in synchronization with the opening and closing of the switching transistor 9, and the duty factor of the opening and closing operations of the switching transistor 9 is 0.1 to 0.25 as described above. Therefore, the power required to generate the ultrasonic waves, the average sound pressure level, and the heat generation of the ultrasonic irradiated surface are all reduced to 10 to 25 times lower than that of the continuous wave type.

However, the above advantages are rather secondary;
The greatest effect of intermittent ultrasonic emission is the increased insect repellent effect and its sustainability.

Although it is difficult to quantitatively demonstrate these insect repellent effects,
50d lower instantaneous sound pressure level than conventional continuous radiation type
Even if low ultrasonic waves are used around B, the same insect repellent effect can be obtained, and the insect repellent effect lasts for a longer period of time.

Note that if the intermittent frequency of ultrasound is set to 10 Hz or higher, this continuous frequency may enter the audible range for some people, causing inconveniences such as hearing unpleasant sounds.
If it is less than z, the insect repellent effect will decrease.

Therefore, it is recommended that this intermittent frequency be within the range of 0.1 to 10 Hz, more preferably several Hz.

Further, the duration of the ultrasonic wave is set to 0.5 seconds or more,
If the intermittent duty factor is set to 0.25 or more, power consumption and other harmful effects will increase, but the insect control effect will not improve.On the contrary, if the duration becomes 0.05 seconds or less, the duty factor When it is less than 0.1, the insect repellent effect is reduced.

Since the present invention is configured in a sloping manner, it is possible to provide an ultrasonic insect repellent that consumes less power and has less negative impact on others, and has a large insect repellent effect.

Note that the configuration of the present invention is not limited to the diagonal embodiment (the shape of the casing, the power supply, the ultrasonic oscillator and its control circuit, etc. may be freely modified within the scope of the present invention). It is possible to change the design by using things, for example, it can be made portable or integrated with various ornaments, utensils, and furniture, and the present invention encompasses all of these.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of an ultrasonic insect repellent according to the present invention, and FIG. 2 is an electric circuit diagram thereof. 1... Ultrasonic insect repellent, 2... Housing, 3
... Ultrasonic emission window, 4 ... Power switch, 5 ... Transformer, 6 ... Rectifier circuit, 7 ... Low frequency oscillation circuit , 8...--High frequency oscillation circuit, 9... Switching transistor,
10... Ultrasonic oscillator.

Claims (1)

[Claims] 1 The ultrasonic oscillator and the above ultrasonic oscillator are intermittently operated at a frequency of 0.1 Hz or more and 10 Hz or less for 0.05 seconds or 0.
．． An ultrasonic insect repellent comprising a control circuit that operates for 5 seconds.