JP5094492B2 - Flat ion generating electrode - Google Patents

Description

  The present invention relates to a plate-like ion generating electrode that generates ions by discharge.

  Examples of this type of ion generating electrode include those described in Patent Document 1 (Japanese Patent Laid-Open No. 2004-363088) (hereinafter referred to as “Conventional Example 1”) and Patent Document 2 (provided by the present applicant) ( Japanese Patent No. 2622821) (hereinafter referred to as “conventional example 2”).

  In Conventional Example 1, at least one first discharge part for generating positive ions and second discharge part for generating negative ions are separated and independent from each other on a single plate-like dielectric. Provided. The first and second discharge parts include first and second induction electrodes embedded in the plate-shaped dielectric, and first and second discharge electrodes provided on the surface of the plate-shaped dielectric. Each pair is formed as a pair. These first and second discharge electrodes are formed on the surface of the plate-like dielectric by printing, and a plurality of sharp portions are integrally projected.

  In Conventional Example 2, a plate-shaped or foil-shaped ground electrode having a plurality of pointed portions is formed on a printed circuit board that is an insulator by a conductive pattern, while a wire-shaped or plate-shaped high voltage electrode is embedded in the printed circuit board. Then, only the tip of the ground electrode is opposed in parallel through a part of the printed circuit board.

  By the way, in an electrode that generates ions by electric discharge, a migration phenomenon occurs in which the metal component of the electrode moves on or in the insulator (nonmetal) that supports the electrode due to the influence of an electric field, and is discharged for a long time. As the migration grows and the electrode deteriorates due to poor insulation or metal corrosion, the metal component of the electrode penetrates into the insulator, increasing the capacitance, and increasing the discharge performance (ion generation performance). Not only does it decrease, it also leads to electrode breakage and peeling.

  In the above-described conventional example 1, the first and second discharge electrodes of the first and second discharge portions that generate plus and minus ions are formed on the surface of the plate dielectric by printing, and the conventional example In Fig. 2, the ground electrode is formed on the printed circuit board with a conductive pattern. However, even if printing is performed, the migration phenomenon is unavoidable. The metal component penetrates into the inside of the plate-like dielectric and not only the discharge performance (ion generation performance) is lowered, but also the electrode is damaged or peeled off. In particular, in Conventional Example 1, the first and second discharge electrodes to which a high voltage is applied are printed and exposed on the surface of the plate-like dielectric, and the exposed first and second discharge electrodes are exposed. Since the discharge is directed toward the internal induction electrode, the first and second discharge electrodes are liable to migrate due to their own electric shock or external factors.

Furthermore, in Conventional Example 1, since positive and negative ions are generated separately, the first and second discharge portions are provided on the plate-like dielectric material apart from each other, and a discharge electrode and an induction electrode are provided for each of them. Since it is provided inside and outside the plate-like dielectric, there is a problem that the electrode structure becomes complicated and the entire plane area becomes large.
JP 2004-363088 A Japanese Patent No. 2622821

  The first problem of the present invention is that the migration of the thin plate-like surface electrode formed on the surface of the dielectric substrate is reduced, the electrode is less deteriorated even when discharged for a long time, the durability is high, and the discharge performance (ion It is an object of the present invention to provide a plate-like ion generating electrode in which a decrease in the generation performance over time is small.

  A second problem of the present invention is that when a thin plate-like surface electrode formed on the surface of a dielectric substrate and an internal electrode embedded in the dielectric substrate are paired, the thin plate-like surface electrode is a ground electrode, and the internal electrode is An object of the present invention is to provide a flat plate ion generating electrode that can minimize migration of a thin plate surface electrode as much as possible by using the discharge electrode, and can reduce the entire plane area.

  The third object of the present invention is to provide a flat ion generating electrode with high discharge directivity and discharge efficiency when a thin plate-like surface electrode is a ground electrode and an internal electrode is a discharge electrode.

  In order to achieve the first object, the present invention according to claim 1 is characterized in that the conductive fiber is oriented in the sheet thickness direction and is formed into a thin plate shape by an anisotropic conductive adhesive sheet having conductivity only in the sheet thickness direction. The surface electrode is adhered to the surface of the dielectric substrate.

In the invention according to claim 2, which is an embodiment thereof, the conductive fibers of the anisotropic conductive adhesive sheet are nickel fibers.
Similarly, in the invention according to claim 3, the material of the thin plate-like surface electrode is titanium, and the material of the dielectric substrate is ceramic.
In the invention according to claim 4, the internal electrode facing the thin plate-like surface electrode is embedded in the dielectric substrate.

In order to achieve the second object, the invention according to claim 5 is characterized in that the thin plate-like surface electrode is a ground electrode to be grounded, and the internal electrode is directed to the thin plate-like surface electrode by applying a high voltage. A discharge electrode that generates discharge is used.

In order to achieve the third problem, the invention according to claim 6 as an embodiment thereof forms a plurality of sharpened portions integrally projecting on the thin plate-like surface electrode, and these sharpened portions are opposed to the internal electrodes.

Similarly, in the invention according to claim 7 , long grooves are formed on the surface of the dielectric substrate, and the sharp edges of the plurality of sharp portions of the thin plate-like surface electrode are arranged along the side edges of the long grooves.
Similarly, in the invention according to claim 8 , the thin plate-like surface electrode is provided with long plate-like side portions on both sides parallel to each other across the long groove of the dielectric substrate, and a plurality of sharp edges are formed from the long plate-like side portions on both sides toward the long groove. Protrusions are formed.
Similarly, in the invention according to claim 9 , a terminal portion for externally connecting the thin plate-like surface electrode and the internal electrode is provided on the back surface of the dielectric substrate.

  The plate-like ion generating electrode according to the present invention has a thin plate-like surface electrode which is made of an anisotropic conductive adhesive sheet having a conductive fiber oriented in the sheet thickness direction and having conductivity only in the sheet thickness direction. Since it is bonded to the surface, the migration between the thin plate-like surface electrode and the surface of the dielectric substrate diffuses to the surface of the dielectric substrate and further penetrates into the dielectric substrate. It can be suppressed by the conductive fibers of the sheet, and even if it is discharged for a long time, there is little deterioration of the electrode and increase in capacitance, high durability, and a decrease in discharge performance (ion generation performance) with time.

In the invention according to claim 2, since the conductive fiber of the anisotropic conductive adhesive sheet is a nickel fiber, it can be joined at a low pressure and can be continuously connected to the path. Sex can be obtained.
In the invention according to claim 3, since the material of the thin plate-like surface electrode is titanium which is a metal having high corrosion resistance, and the material of the dielectric substrate is ceramic which is a dielectric having high resistance to ozone and ultraviolet rays, Durability can also be improved in terms of material.

In the invention according to claim 4, since the internal electrode facing the thin plate-like surface electrode is embedded in the dielectric substrate, the migration by the thin plate-like surface electrode is suppressed as described above, while the internal electrode is made of a dielectric material. It is protected with a substrate, and a dielectric barrier discharge between these electrodes can be stably generated.

In the invention according to claim 5 , since the thin plate surface electrode is a ground electrode to be grounded, and the internal electrode is a discharge electrode that generates a dielectric barrier discharge toward the thin plate surface electrode when a high voltage is applied. Compared to the conventional case where a discharge electrode to which a voltage is applied is formed and exposed on the surface of the dielectric substrate, the discharge electrode is safe and the deterioration of the electrode is much less.

Since the plate-like ion generating electrode according to the present invention becomes a capacitor load when connected to a high-voltage power supply, in order to reduce the load on the power supply, the internal electrode embedded in the dielectric substrate is a dielectric substrate. It is better that the area facing the thin plate-like surface electrode is as small as possible. In view of this, the invention according to claim 6 takes this point into consideration and integrally forms a plurality of sharpened portions on the thin plate-like surface electrode, and these sharpened portions are opposed to the internal electrodes. However, since it discharges with the small capacitor | condenser load toward the point of several sharp parts of the thin plate-like surface electrode used as a ground electrode, it has a favorable discharge characteristic.

In the invention according to claim 7 , since the long groove is formed on the surface of the dielectric substrate, and the sharp edges of the plurality of sharp portions of the thin plate-like surface electrode are along the side edges of the long groove, sufficient ions are formed around the sharp edges. Since the directivity of discharge can be improved while securing the generation space, the ion generation efficiency is improved.

According to an eighth aspect of the present invention, a thin plate-like surface electrode is provided with long plate-like side portions on both sides parallel to each other across the long groove of the dielectric substrate, and a plurality of sharp portions are formed from the long plate-like side portions on both sides toward the long groove. Thus, the number of discharge points per unit area can be increased, and the amount of generated ions can be increased.

In the invention according to claim 9 , since the terminal portion for externally connecting the internal electrode is provided on the back surface of the dielectric substrate, a high voltage can be applied from the back side of the dielectric substrate, which is safe.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 6, the plate-like ion generating electrode of this example is between the front dielectric substrate 1 that is a ceramic long plate and the back dielectric substrate 2 that is a ceramic long plate, Laminated and integrated with an internal electrode 3 which is a metal thin plate such as stainless steel or copper, and a thin plate-like surface electrode 4 which is a titanium thin plate is bonded to the surface of the front dielectric substrate 1 by an anisotropic conductive adhesive sheet 5 It is.

  As shown in FIG. 7, the anisotropic conductive adhesive sheet 5 has a structure having conductivity only in the sheet thickness direction by orienting the conductive fibers 6 in the sheet thickness direction. As such an anisotropic conductive adhesive sheet 5, for example, an anisotropic conductive adhesive film (ACF) provided by Btech, USA is suitable. In this film, nickel fibers are oriented in the thickness direction up to a maximum volume ratio of 40%, and light pressure is applied from both the upper and lower surfaces, so that the upper and lower ends of the fibers are placed between the thin plate-like surface electrode 4 and the front-side dielectric substrate 1. Can be contacted. In addition, it is possible to join at a low pressure compared to a normal anisotropic conductive adhesive film, and since the conductive filler is filled not in particles but in a fibrous form, it is possible to conduct without a break in the path, Conductivity similar to that of solder (Z direction: <150 μohm, 1.5 cm2, 100 μm thickness).

A long groove 7 that does not reach the back surface is formed in the center of the front surface of the front dielectric substrate 1.
The thin plate-like surface electrode 4 is integrally formed by connecting the long plate-like side portions 4a and 4b on both sides parallel to each other with the long groove 7 therebetween at the continuous end portion 4c. Further, the sharp portions 4d and 4e on both sides protruding from the long plate-like side portions 4a and 4b on both sides toward the long groove 7 are provided at a plurality of positions at intervals in the longitudinal direction, and the sharp ends of the sharp portions 4d and 4e. Are integrally formed along the side edge of the long groove 7. Connected to the continuous end 4c is a grounding terminal 9 fitted in the terminal hole 8 of the front and back dielectric substrates 1 and 2. The front end surface of the ground terminal 9 is exposed on the back surface of the dielectric substrate 2 on the back side. The entire surface of the thin plate-like surface electrode 4 is coated with a silicon film.

  The internal electrode 3 has a long plate shape as a whole, but in order to oppose the sharp portions 4d and 4e at a plurality of locations on the thin plate-like surface electrode 4, a counter electrode portion 3a having a circular area is formed at a plurality of locations. In addition, a terminal connection portion 3b having a smaller circle and a larger area is formed. Each counter electrode portion 3a is opposed to a required area including the sharp ends of the sharp portions 4d and 4e at each location. A high voltage applying terminal 11 fitted in the terminal hole 10 of the back side dielectric substrate 2 is connected to the terminal connecting portion 3b. The front end surface of the high voltage application terminal 11 is also exposed on the back surface of the dielectric substrate 2 on the back side.

  The plate-like ion generating electrode configured as described above has the internal electrode 3 as a discharge electrode by connecting the high voltage applying terminal 11 to a high voltage power source and applying a positive or negative high voltage to the internal electrode 3. In addition, the ground terminal 9 is connected to the ground, and the thin plate surface electrode 4 is used as the ground electrode.

  When a plus / minus high voltage is applied to the internal electrode 3, the facing dielectric substrate 1 is moved from each counter electrode portion 3 a toward the tip of the sharp portions 4 d and 4 e on both sides of the thin plate-like surface electrode 4 that is grounded. A dielectric barrier discharge is generated, and positive and negative ions are generated around the tips of the sharp portions 4d and 4e. In the front-side dielectric substrate 1, the thickness of the portion where the long groove 7 is formed is thin, and the sharp portions 4d and 4e on both sides extend to the side edges of the long groove 7, so that the sharp portions 4d and 4e on both sides are formed. The directivity of the discharge toward the tip is good, and a sufficient ion generation space can be secured around the tip.

  Since the thin plate-like surface electrode 4 is adhered to the surface of the dielectric substrate by the anisotropic conductive adhesive sheet 5 having conductivity only in the sheet thickness direction, the thin plate-like surface electrode 4 and the surface of the dielectric substrate 1 are The conductive fibers 6 of the anisotropic conductive adhesive sheet 5 can suppress the migration between them from diffusing to the surface of the dielectric substrate 1 and further penetrating into the dielectric substrate 1.

  For comparison, a thin plate-like surface electrode 4 bonded to the surface of a ceramic dielectric substrate 1 with a silver paste was prototyped and subjected to a discharge test in which a high voltage was continuously applied for one month. As silver diffused on the surface of the dielectric substrate 1 and penetrated into the interior, significant migration was confirmed. When the change in capacitance was measured, the capacitance increased with time. In addition to the silver paste, a discharge test was conducted in the same manner on an adhesive bonded with nickel particles, which are said to have relatively little migration, but migration was confirmed even if not as much as the silver paste. It was.

  On the other hand, as a result of conducting a discharge test in the same manner as the anisotropic conductive adhesive sheet 5 using the above-mentioned anisotropic conductive adhesive film manufactured by Btech in the United States, the progress of migration has elapsed for one month. It was not confirmed later. When the change in capacitance was measured, the increase in capacitance was negligible compared to the case of silver paste and nickel particle adhesive. Further, when the plus / minus ion current was measured, the plus / minus ion balance was also good.

  The flat plate ion generating electrode according to the present invention can be widely used as an electrode for a static eliminator, a charger, an ion generator or the like.

It is a top view of the flat ion generating electrode which is an Example of this invention. It is the side view. FIG. It is the sectional view on the AA line of FIG. It is a BB line sectional view similarly. It is a CC sectional view similarly. It is a schematic diagram of an anisotropic conductive adhesive sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front side dielectric substrate 2 Back side dielectric substrate 3 Internal electrode 4 Thin plate-like surface electrode 4a * 4b Long plate-like side part 4c Continuous edge part 4d * 4e Sharp part 5 Anisotropic conductive adhesive sheet 6 Conductive fiber 7 Long groove 8 Terminal Hole 9 Ground terminal 10 Terminal hole 11 High voltage application terminal

Claims (9)

  A plate-like ion characterized in that conductive fibers are oriented in the sheet thickness direction and a thin plate-like surface electrode is adhered to the surface of the dielectric substrate by an anisotropic conductive adhesive sheet having conductivity only in the sheet thickness direction. Generating electrode.   The plate-like ion generating electrode according to claim 1, wherein the conductive fibers of the anisotropic conductive adhesive sheet are nickel fibers.   3. The flat plate ion generating electrode according to claim 1, wherein the material of the thin plate surface electrode is titanium and the material of the dielectric substrate is ceramic. Tabular ion generating electrode according to any of claims 1 to 3 internal electrode facing the thin plate surface electrode is characterized in that it is embedded in the dielectric substrate. A ground electrode which is grounded lamellar surface electrodes, the internal electrodes, according to claim 4, characterized in that the application of a high voltage to the discharge electrode toward the laminar surfaces electrodes produce a dielectric barrier discharge Flat ion generating electrode. 6. The flat plate ion generating electrode according to claim 4 or 5 , wherein a plurality of sharpened portions are integrally formed on the thin plate-like surface electrode so as to face the internal electrode. Forming a long groove into the surface of the dielectric substrate, flat plate according to a plurality of tip of the pointed portion of the thin plate surface electrodes, in any one of claims 4 to 6, characterized in that along a side edge of the long groove Ion generating electrode. The thin plate-like surface electrode is provided with long plate-like side portions on both sides parallel to each other across the long groove of the dielectric substrate, and a plurality of sharp portions project from the long plate-like side portions on both sides toward the long groove. The flat ion generating electrode according to claim 7 . The back surface of the dielectric substrate, tabular ion generating electrode according to any one of claims 4 to 8, characterized in that a terminal portion for external connection lamellar surface electrode and the internal electrode.

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