SU1442161A1 - Arrangement for protecting from insects - Google Patents

Abstract

The invention relates to the design of protective devices, for example, against mosquitoes, for individual use. The purpose of the invention is to simplify the design, reduce the size, and weight of the device. When a power source is connected to the multivibrator, oscillations are excited in the latter. During the operation of the multivibrator, periodic recharging of the sections of the piezoelectric elements 4 and 5 occurs, and the time of the driving capacitors is performed. The change in voltage on the electrodes of the piezoelectric element 3 leads to its linear deformation, in phase with the oscillation frequency of the multivibrator. The piezoelectric element 3 is rigidly connected (glued) to the membrane 1; therefore, the linear deformations of the piezoelectric element 3 cause bending vibrations of the membrane 1. In this case, the acoustic oscillations change with a frequency of oscillations equal to the frequency of oscillations of the multivibrator, 2 or more. with $ (L with:

Description

  TO)

1

This invention relates to the field of designing insect repellent devices, namely mosquitoes, for individual use.

The purpose of the invention is to simplify the design, reduce the size and weight of the device.

Fig, 1 shows a variant of the design of the acoustic emitter; Fig, 2 is a variant of the circuit of the multivibrator.

The acoustic emitter contains a dielectric membrane 1 fixed in case 2 and piezoelectric element 3 Piezo element 3 is rigidly connected to membrane 1 by one side, for example. Glued. Piezoelement electrodes 3 are divided into two pairs of sections 4 and 5, which are included in the multivibrator circuit .

The multivibrator contains two transistors 6 each, two base resistors 7 each, and two 8o load resistors each. Two sections 4 and 5 of the piezoelectric element of the acoustic emitter are used as master capacitors. At the same time, a point near the piezoelectric electrode indicates the direction of the polarization vector, Ili-i- thaws the multivibrator from the power source 9,

The device works as follows.

When the power source 9 is connected to the multivibrator, oscillations are determined in the latter, determined by the ratio of resistors 7 and 8 and the capacitance of sections 4 and 5. By selecting a resistor 7, the oscillation frequency is chosen

VNIIPI Order 6323/4

Random polygons pr-tie, Uzhgorod, st. Project, 4

equal to 12, .0 14 kHz. During operation of the multivibrator, periodic recharging of sections 4 and 5 of the piezoelectric element occurs. The voltage on sections 4 and 5 has a form that is close to triangular, with a magnitude equal to the supply voltage.

The voltage variation on the electrodes of the piezoelectric element 3 leads to its linear deformation, in-phase with the oscillation frequency of the multivibrator. The piezoelectric element 3 is rigidly connected (glued) to the membrane 1, therefore the linear deformations of the piezoelectric element 3 cause bending oscillations of the membrane 1. Radiation of acoustic oscillations with frequency oscillations equal to the oscillation frequency of the multivibrtor.

Claims (1)

Invention Formula The insect protection device, containing a high-frequency generator and an acoustic emitter, is due to the fact that, in order to simplify the 1I design, reduce the size and weight of the device, the high-frequency generator is made in the form of a multivibrator, and the acoustic emitter is equipped with a piezoelectric element with both sides with two pairs of electrodes, each pair of electrodes being connected to the corresponding multifibrator full feedback circuit, and the piezoelectric element is rigidly fixed to the acoustic radiation membrane tel. FIG. g Circulation 519 Subscription