SU674634A1 - Electret Making Device - Google Patents

Description

Union of Soviet

Socialist

Republics

DESCRIPTION

Inventions

TO AUTHOR'S CERTIFICATE

n) 674634 (72) Authors of the invention (71) Applicant (61) Additional to ed. certificate-wu - (22) Declared 15.12.76 (21) 2429092 / 18-21 with the addition of application No. - (23) Priority -

Published 02.28.82. Bulletin j \ o S

Date of publication of the description 02.28.82 (51) M. Cl. ³

H 01 G 13/00

H 01 G 7/02 (53) UDC 621.319.4 (088.8)

V. G. Boytsov, V. P. Druzhinin, M. G. Gonchar, -.

N. A. Kuznetsov, A. S. Skugarev, B. A. Tazenkov v <

and K. A. Melikov "|

Leningrad Order of the Red Banner of Labor) / У ??;? -; /; State Pedagogical Institute A. Herzen ”(54) DEVICE FOR THE PRODUCTION OF ELECTRETHES

The invention is intended for use in the radio industry, in particular for the manufacture of electret membranes of microphones.

A device for the manufacture of electrets is known, comprising a cassette for the device in it of dielectric films, serving simultaneously as a metal substrate, a thermostat for drying films after removing a random charge (zeroing) by water, and an ERA-1 processor with wire electrodes for polarizing the films. Films glued to microphone rings are loaded into a cassette; each film is watered with distilled water for 10 s for zeroing, dried in a thermostat at 100 ° C for 20 min, and polarized in the processor of the ERA-1 apparatus [1].

The disadvantage of this device is the low performance and the presence of a large number of different devices.

The closest technical solution to the invention is a device for the manufacture of electrets, containing a node for neutralizing dielectrics, made in the form of an electrode enclosed in a metal casing, an electrode for their polarization, made in the form of a corona needle connected to a voltage source, and located above the rotary cassette of dielectric, on the circumference of which the nests are milled, in the latter there are metal substrates for arranging dielectrics. In addition, under the rotary cartridge installed other contacts for interaction with a metal substrate [2].

The disadvantage of this device is 10 low stability of the charge of dielectric films due to the uneven distribution of charge on the surface of the dielectric film and insufficient performance.

The aim of the invention is to increase the stability of the charge of electrets and the performance of the device.

To achieve this goal, in a device containing a rotatable cassette with dielectric strips on it, n a dielectric neutralization unit located above it, made in the form of a needle enclosed in a metal casing and connected to an alternating voltage source, n electrode for polarizing dielectrics made in in the form of a needle connected to a constant voltage source, the electrode for polarization is equipped with a metal casing with a grid located between the electrode and the rotary cassette and connected!) e a stabilized voltage source, and the metal casing of the neutralization unit is equipped with a grid located between the needle and the rotary cartridge and connected to the cartridge.

In FIG. 1 shows a diagram of the proposed device; in FIG. 2 - placement in space of the main nodes.

A device for the manufacture of electrets consists of a grounded rotary cassette 1 made of stainless steel, a fixing lining 2 of D16T alloy mounted on it, having twenty-nine grooves made in the shape and size of the microphone rings 3 with dielectric films glued on them. Above the overlay. 2, a corona tungsten needle 4 of a dielectric neutralization device connected to a source of temporary voltage of 2.5 kV (IVN) is located. The needle 4 is enclosed in a metal casing 5, the lower base of which is made in the form of a metal mesh 6 connected to the body. The distance between the needle 4 and the net '6, as well as between the microphone ring 3 and the net 6 is 2 mm. A tungsten electrode 7 for polarization is also located above the plate 2 and connected to a source of high constant voltage 3.8 kV (IVN). The tungsten electrode 7 for polarization is enclosed in a metal casing 8, the lower base of which is made in the form of a metal grid 9. The distance between the electrode 7 and the grid 9, as well as between the ring 3 and the grid 9 is 2 mm. The casing 8 with the grid 9 is connected to a stabilized voltage source (ISN) with a value equal to the potential obtained on the dielectric film of the microphone ring 3.

The device operates as follows.

When applying a high alternating voltage of 2.5 kV to the corona needle 4 during the passage of the microphone ring 3 under the grid 6 in the space surrounding the needle 4, positive and negative ions arise, which move to the charged dielectric through the grid 6 with zero potential. A drawing field between the grid 6 and the dielectric film of the microphone ring 3 will be as long as there is a potential difference between the grid 6 and the dielectric film of the microphone ring 3. When the surface potential of the dielectric film becomes equal to the potential of the grid 6, the ion motion ceases and the surface of the dielectric neutralized. In the position where the ring 3 is located under the polarizing electrode 7, the dielectric film of the ring 3 is polarized in a constant short discharge. Polarization occurs as long as there is a potential difference between the dielectric film of the microphone ring 3 and grid 9. When the potential of the dielectric film of the microphone ring becomes equal to the potential of grid 6, all ions formed in the short-discharge field are deposited on grid 9, since it is located closer to the polarizing electrode 7 than the microphone ring 3, and polarization ceases.

The device allows you to automatically adjust the polarization process, which allows you to get electrets with a small potential spread. This, in turn, increases the stability of the charge and the yield of products by about 1.5 times in relation to the known device.

Claims (2)

the cassette and connected to the source of stabilized voltage, and the metal casing of the neutralization unit is equipped with a grid, a needle and a turning cassette and connected to the cart. FIG. 1 shows a diagram of the proposed device; in fig. 2 - placement in the space of the main nodes. The device for making electrets consists of a grounded rotary cassette 1 made of stainless steel, a fixing plate 2 installed on it of D16T alloy, having twenty-nine grooves made according to the shape and dimensions of the microphone rings 3 with dielectric films pasted on them. Over the plate. 2 there is a coronating tungsten needle 4 of a device for neutralizing dielectrics, connected to a source of 2.5 kV temporary voltage (IVN). The needle 4 is enclosed in a metal casing 5, the lower base of which is made in the form of a metal mesh 6 connected to the housing. The distance between the needle 4 and the grid 6, as well as between the microphone ring 3 and the grid 6 is 2 mm. The tungsten electrode 7 for polarization is also placed above the strip 2 and is connected to a high constant voltage source of 3.8 kV (IVN). The tungsten electrode 7 for polarization is enclosed in a metal case 8, the lower base of which is made in the form of a metal grid 9. The distance between the electrode 7 and the grid 9, as well as between the ring 3 and the grid 9 is 2 mm. The casing 8 with the grid 9 is connected to a source of stabilized voltage (ICV) equal to the potential obtained on the dielectric film of the microphone ring 3. The device operates as follows. When a high alternating voltage of 2.5 kV is applied to the corona needle 4 during the passage of the microphone ring 3 under the grid 6, positive and negative ions appear in the space surrounding the needle 4, which move to the charged dielectric through the grid 6 with zero potential. The T field between the grid 6 and the dielectric film of the microphone ring 3 will be as long as there is a potential difference between the grid 6 and the dielectric film of the microphone ring 3. When the potential of the surface of the dielectric film becomes equal to the potential of the grid 6, the ion movement ceases and the surface of the dielectric neutralizes . At nostalgia, when the ring 3 is located under the polarizing electrode 7, the dielectric film of the ring 3 is polarized in a constant short discharge. Iolization occurs as long as there is a potential difference between the dielectric film of the microphone ring 3 and the grid 9. When the potential of the dielectric film of the microphone ring becomes equal to the potential of the grid 6, all ions formed in the short-discharge field are deposited on the grid 9, since it is located closer to the polarizing electrode 7 than the microphone ring 3, and the polarization stops. The device allows you to automatically adjust the process of polarization, which allows you to get electrets with a small potential spread. This, in turn, increases the stability of the charge and the yield of products by about 1.5 times in relation to the known device. The invention The device for the manufacture of electrets, containing a rotary cassette with dielectric films placed on it and an assembly for neutralizing dielectrics arranged above it, made in the form of a needle enclosed in a metal casing and connected to an alternating voltage source, and an electrode for polarizing dielectrics made in the form of a needle connected to a source of constant voltage, characterized in that, in order to increase the stability of the electret charge and the performance of the device va, the electrode for polarization is provided with a metal casing with the mesh electrode and located meladu swivel cassette and connected to a source of stabilized voltage x tim and the metal casing is provided with a neutralization assembly grid located meladu needle and the rotatable cassette and connected to this cassette. Information sources and information are given in the attention of experts 1. Report LI 71028727 of the Leningrad State Pedagogical Institute. A.I. Herzen, 1972. 2. Forward N ° 2331150/21, according to which the decision was taken to issue an author's certificate, 10.03.76. -0 mn nsn ir (yen y g