JP2006222019A - Ion generating element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ion generating element having a discharge electrode and a dielectric electrode arranged on an identical plane capable of obtaining larger ion effect, without enlarging an area of an ion generating electrode part. <P>SOLUTION: The discharge electrode 2 and the dielectric electrode 3 constituting an ion generating electrode are arranged on an identical plane, and concave parts 8 are formed on the dielectric electrode 3. Needle-shaped electrode parts 2a of the discharge electrode 2 are made to get into the concave parts 8 and the discharge electrode 2 and the dielectric electrode 3 are covered by an insulation body 4. By the above, a larger ion effect is obtained without enlarging the area of the ion generating electrode part. A minute inter-electrode gap is formed between the discharge electrode 2 and the dielectric electrode 3 by forming a pattern through etching of a conductor, after forming the conductor made of a gold film on a substrate 1 made of an alumina sintered compact. Further, dielectric strength is improved by using crystallized glass as the insulation body 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is intended to inactivate bacteria and viruses with ions, or to increase comfort with ions. For this purpose, an air cleaner, an air conditioner, a humidifier, a dehumidifier, and a vacuum cleaner or refrigerator It is related with the ion generating element mounted in electric equipments, such as.

  As a method of generating ions, there are a method of generating ions by applying a Leonard effect by giving an impact to water, and a method of generating ions electrically by applying a high voltage to the electrodes. The method of generating ions by the Leonard effect has the disadvantage that only negative ions can be generated and positive ions cannot be generated, the air is humidified, or the apparatus is enlarged.

  On the other hand, the method of generating ions by applying a high voltage to the electrode can be basically realized by a similar electrode structure, and a high voltage is applied between the needle-shaped electrode and the dielectric electrode facing the electrode. By applying, ions can be generated. In this high voltage application method, the creeping discharge method in which a voltage is applied between, for example, the back surface and the front surface of a dielectric material uses a dielectric material having a dielectric constant higher than that of air, so a voltage is applied between electrodes in the air. Compared with the system, there is an advantage that ions can be generated generally at a low voltage. In addition, the high voltage application method has an advantage that the amount of generated ion species can be changed by adjusting the discharge energy applied to the air.

  Thus, among the high voltage application methods, the creeping discharge method has the advantage that ions can be generated at a relatively low voltage and that the entire system can be reduced in size compared with other methods even if peripheral circuits are included.

  However, in order to increase the effect of removing harmful microorganisms such as bacteria, fungi and viruses by ions, it was necessary to increase the ion concentration. In addition, ions usually have a lifetime of about 5 seconds, and the ions decrease with time. Therefore, in order to spread the effect of ions throughout the room, it was necessary to increase the concentration of ions generated from the ion generating element. .

Further, as disclosed in Patent Document 1, the ion generating electrode in the creeping discharge method has a structure in which electrodes are provided on the upper and lower sides of a dielectric film or a dielectric substrate, and Patent Document 2 and Patent Document 3 As disclosed in the above, there is a structure in which electrodes are arranged in the same plane on a substrate. In either case, ions are generated by applying a voltage between both electrodes with an insulator (dielectric) in between.
JP 2003-47651 A JP-A-8-82980 JP 2004-35379 A

  However, in the structure in which electrodes are arranged above and below a dielectric as shown in Patent Document 1, it is difficult to significantly increase the ion generation efficiency, and in order to increase the amount of ions, the area of the discharge electrode must be increased. There was a need to do. For this reason, the installation space for attaching to an apparatus became large, the apparatus enlarged, and also became a factor of cost increase.

  Further, in the structure in which the discharge electrode and the dielectric electrode are arranged in the same plane as shown in Patent Documents 2 and 3, the structure in which the linear discharge electrode and the linear dielectric electrode are alternately arranged Is disclosed, but no device has been devised to increase the amount of ions generated with a compact structure.

  In view of the above, the present invention has a structure in which a discharge electrode and a dielectric electrode as ion generation electrodes are arranged on the same plane, and can obtain a larger ion effect without increasing the area of the ion generation electrode portion. An object of the present invention is to provide an ion generating element capable of performing the above. Another object of the present invention is to provide an ion generating element that can generate ions at a low voltage. Another object of the present invention is to provide an ion generating element with stable quality that does not cause dielectric breakdown.

  In order to achieve the above object, according to the present invention, in a creeping discharge type ion generating element, a discharge electrode and a dielectric electrode constituting the ion generating electrode are arranged to face each other on the same surface, and the dielectric electrode has a recess. The needle electrode portion of the discharge electrode is interposed in the recess, and the discharge electrode and the dielectric electrode are covered with an insulator.

  FIG. 1 is a schematic sectional view showing an ion generating element according to the present invention, and FIG. 2 is a schematic plan view of the ion generating element according to the present invention. In the ion generating element according to the present invention, as shown in FIG. 1, the electrodes 2 and 3 are arranged on the same surface on the substrate 1 and a voltage is applied between the electrodes 2 and 3, so An area 7 where 6 spreads in the air is enlarged.

  On the other hand, FIG. 3 is a schematic cross-sectional view of a comparative example of an ion generating element that schematically illustrates a conventional method of applying a voltage between the upper conductor 102 and the lower conductor 103 with a dielectric interposed therebetween, as in Patent Document 1. 4 shows the plane schematic diagram. As shown in FIG. 3, the ion generating element of the comparative example is a system in which a voltage is applied between the upper discharge electrode 102 and the lower dielectric electrode 103 with a dielectric in between, and the electric lines of force 106 are the upper discharge electrode. 102 and the lower dielectric electrode 103 are connected to each other, and accordingly, a region 107 (dark ink portion) that spreads in the air of the electric lines of force 106 is reduced. In the figure, reference numeral 104 denotes a dielectric for insulating coating, and 105 denotes a power supply circuit.

  As described above, compared to the comparative example shown in FIG. 3, in the present invention, in which the electric field lines are wide in the air, the region 7 where ions are generated is widened, and ions can be generated efficiently. .

  The present invention is characterized in that in the arrangement structure of the ion generating electrodes within the same plane as described above, a concave portion is formed in the dielectric electrode, and a needle-like electrode portion of the discharge electrode is interposed in the concave portion.

  In the above configuration, by interposing the needle electrode portion of the discharge electrode in the concave portion of the dielectric electrode, the discharge electrode and the dielectric electrode are compared with the case where the needle electrode portion and the planar dielectric electrode portion face each other as they are. The area occupied by becomes smaller. In addition, although the area occupied by the ion generating electrode portion is reduced, the ion generating efficiency is equal to or higher than that in the case where the needle electrode portion and the planar dielectric electrode portion are directly opposed to each other.

  The combination of the acicular electrode portion of the discharge electrode and the concave portion of the dielectric electrode may be either a single piece or plural pieces, and various modes are conceivable. As a plurality of combinations of the acicular electrode portion of the discharge electrode and the concave portion of the dielectric electrode, for example, the discharge electrode is formed perpendicularly to the linear portion, and the plural acicular electrode portions are formed at intervals, while the dielectric electrode The aspect which forms a some recessed part in the electrode facing the said some acicular electrode part can be illustrated. In this case, the linear portion of the discharge electrode may be linear, annular, or substantially C-shaped with one end open. The dielectric electrode having a plurality of recesses may be disposed inside and / or outside according to the shape of the linear portion of the discharge electrode.

  The discharge electrode may be an electrode pattern in which a plurality of linear linear portions are arranged in parallel and ends of the linear linear portions are connected by a conductor. In this case, a plurality of needle-like electrode portions are formed perpendicularly to each linear portion, and the needle-like electrode portions of the adjacent linear portions are arranged in a staggered manner. And the planar electrode part of the said dielectric electrode is arrange | positioned between the said linear parts, and let it be the electrode pattern which connected the end parts by the conductor.

  In the above configuration, as the discharge electrode, the needle-like electrode portions of the linearly adjacent linear portions arranged in parallel are arranged in a staggered manner, and a concave portion is formed in the planar electrode portion of the dielectric electrode so as to be opposed thereto. Therefore, the plurality of recesses formed in the planar electrode part are also formed in a staggered manner, and the recesses can be formed without interfering with each other in the width direction of the planar electrode part, Therefore, the width of the planar electrode portion can be reduced, and the ion generating electrode portion can be formed compactly.

  In the above ion generating element, the ion generating electrode can be formed on the substrate by a thick film printing / firing method. Accordingly, the electrode can be formed at a lower cost than when the electrode is formed by a vapor deposition method or a sputtering method, or by a plating method or a green sheet laminating method in which a green sheet is laminated after printing.

  In this case, the ion generating electrode can be patterned by etching after a conductor is formed on the substrate by a thick film printing / firing method.

  In the ion generating element, in order to reduce the power consumption, it is necessary to reduce the voltage applied to the ion generating electrode. For this purpose, it is necessary to lower the minimum voltage at which ions can be generated. In order to reduce the voltage at which ions can be generated, as shown in FIG. 1, the distance between electrodes to which a voltage is applied is made as small as possible in consideration of the withstand voltage of an insulator (dielectric) formed between the electrodes. There is a need.

  When the electrode pattern is directly formed by the thick film printing method, the limit of the inter-line distance is 0.2 to 0.25 mm in consideration of pattern bleeding due to printing. On the other hand, in the system in which thick film printing is performed on the entire surface of the substrate and the electrode pattern is formed by etching, the line spacing can be reduced to about 50 μm. Therefore, the minimum voltage capable of generating ions can be reduced.

  Note that an alumina sintered body can be used as the substrate on which the electrodes are formed.

  Further, gold can be used as the ion generating electrode. By using a gold electrode as the ion generating electrode, etching can be easily performed using a potassium iodide-based etching solution. For this reason, an ion generating electrode having a minute inter-electrode distance can be easily formed.

  As a thick film conductor, a general silver / palladium (AgPd) -based conductor or an Ag conductor is difficult to etch with high accuracy, and a minute inter-electrode distance cannot be formed with high accuracy. On the other hand, in the method of forming an electrode such as aluminum by sputtering or vapor deposition, it can be easily etched, but it takes longer time to form a film than the printing method, and it is more expensive than the thick film printing / firing / etching method. Cost. In the method of forming and etching a film by plating, a copper film can be easily formed, but surface roughening, Pd adhesion treatment, electroless plating for forming a plating film, and further to make the film thicker Therefore, the film formation cost is higher than the thick film printing / firing method. Therefore, a thick film printing / firing / etching method using gold is the lowest cost, and an ion generating electrode having a minute inter-electrode distance can be easily formed.

  Ions are generated by separating water molecules, oxygen molecules, and the like in the air. Therefore, in order to generate ions, it is necessary to give an electric field strength of a certain electric field or more in the air. However, when a spark discharge occurs between the electrodes, a sufficient electric field is not given in the air and almost all ions are generated. I can't.

  The dielectric breakdown voltage of air is as small as about 500 V / mm, but in order to generate ions, it is necessary to apply a voltage of at least 2000 V / mm. In the present invention, since an insulator (dielectric material) is formed on electrodes formed in the same plane, an electric field sufficient for generating ions can be applied to the air without generating a spark discharge.

  In the present invention, crystallized glass is used as an insulator covering the ion generating electrode, and the insulating film is formed by a thick film printing / firing method. In order to prevent spark discharge between the ion generating electrodes, the insulator (dielectric material) on the electrodes needs to have a sufficient withstand voltage, and needs to have a sufficient film thickness in consideration of the withstand voltage. Need to form. Moreover, in order to form an ion generating element at low cost, it is necessary to employ a method that can be formed at low cost.

  There are mainly three methods for forming the insulator covering the ion generating electrode. One is a method by vapor deposition and sputtering. In this method, since it takes a long time to obtain a thick film of at least 5 μm in consideration of the withstand voltage, there is a disadvantage that the cost is increased. The second method is a green sheet laminating method, in which an electrode is printed on an alumina green sheet, and then an overcoat alumina green sheet is laminated, pressed, and fired. This green sheet laminating method has an advantage that it can be formed at a lower cost than vapor deposition and sputtering. The third method is a thick film printing method. For example, after an electrode is formed on a baked alumina substrate, a glass-based thick film paste is formed by printing and baking.

  Although the thick film printing method can be formed at the lowest cost, the amorphous glass used as a general thick film overcoat glass has large surface irregularities and is likely to cause film thickness unevenness. . There is also a problem that pinholes are likely to occur. For this reason, there is a problem that it is difficult to stably obtain a sufficient withstand voltage that can withstand a high voltage.

  In the present invention, since crystallized glass is used as the overcoat insulator (dielectric) covering the electrode, a film with little film thickness unevenness and few pinholes can be formed. Since it forms, it can form at low cost.

In the ion generating element as described above, the generated positive ions are H ₃ O ⁺ (H ₂ O) _m and the negative ions are O ₂ ⁻ (H ₂ O) _n (m and n are natural numbers). And By generating these ions in the air, it is possible to inactivate bacteria and viruses and inactivate allergens. Moreover, these ions are the same kind as ions existing in the natural world such as forests and are harmless to the human body. In addition, in order to generate | occur | produce these ions, it becomes possible by adjusting the energy applied to air.

The ion generation electrode generates at least one of hydrogen peroxide H ₂ O ₂ , hydrogen dioxide HO _2, or hydroxy radical / OH having a high decomposing ability by a chemical reaction between positive ions and negative ions. And obtained by the following reaction.
H ₃ O ⁺ + O ₂ ⁻ → OH + H ₂ O ₂
H ₃ O ⁺ + O ₂ ⁻ → HO ₂ + H ₂ O

  As described above, in the ion generating element according to the present invention, since the ion generating electrodes are arranged adjacent to each other on the same plane, the ion generating discharge area in the air is widened and the amount of generated ions is increased. A larger ion effect can be obtained without increasing the area of the electrode portion. Further, since the electrodes arranged in the lateral direction are covered with an insulator, the distance between the electrodes can be reduced, and as a result, ions can be generated at a low voltage. Furthermore, by interposing the needle electrode portion of the discharge electrode in the concave portion of the dielectric electrode, the area occupied by the discharge electrode and the dielectric electrode as compared with the case where the needle electrode portion and the planar dielectric electrode portion face each other as they are. The ion generating element can be formed compactly.

  In addition, since the electrode and the insulator film are formed by the thick film printing / firing method, it can be manufactured efficiently at a low cost. Here, by using a gold electrode as an electrode and performing etching, a minute inter-electrode distance can be formed, so that ions can be generated at a low voltage.

  Furthermore, by using crystallized glass as the insulator, a film having a uniform film thickness and no pinholes can be formed, and an ion generating element with stable quality that does not cause dielectric breakdown can be formed.

Furthermore, according to the ion generating element of the present invention, by adjusting the discharge energy so that the energy given to the molecules in the air is about 5 eV, H ₃ O ⁺ (H ₂ O) m as negative ions, negative By generating O ₂ ^— (H ₂ O) n as the main ion, inactive microorganisms in the air are activated by the active species of hydroxy radical / OH, hydrogen peroxide H ₂ O ₂ , and hydrogen dioxide HO _2. And purify organic matter.

  FIG. 1 is a schematic sectional view showing an ion generating element according to the present invention, and FIG. 2 is a schematic plan view of the ion generating element according to the present invention. In the ion generating element according to the present invention, as shown in FIG. 1, a discharge electrode 2 and a dielectric electrode 3 constituting an ion generating electrode are arranged on the same surface on a substrate 1 so as to face each other. The electrode 3 is covered with an insulator 4 and a voltage is applied from the power supply circuit 5 between the electrodes 2 and 3.

  In FIG. 1, reference numeral 6 indicates electric lines of force formed between the discharge electrode 2 and the dielectric electrode 3, and reference numeral 7 (portion represented by dark black) indicates a voltage between the electrodes 2 and 3. The area | region which spreads in the air of the ion generate | occur | produced by applying is shown.

  As the substrate 1, a flat plate made of an alumina sintered body can be used. The discharge electrode 2 formed on one surface of the substrate 1 includes a plurality of linear linear portions 2a arranged in parallel to each other, and a plurality of linear electrodes 2a that are orthogonal to and spaced from each linear portion 2a. A lead wire connection port 2d for connecting to the power supply circuit 5 is formed in a part of the conductor 2c. The lead wire connection port 2d is formed of a needle electrode portion 2b and a conductor 2c that connects the ends of the plurality of linear portions 2a. ing.

  The needle-like electrode portion 2b is formed in a triangular shape with a sharp tip, and the needle-like electrode portions 2b of the adjacent linear portions 2a are arranged in a staggered manner so as to oppose a later-described concave portion 8 of the dielectric electrode 3. Has been.

  On the other hand, the dielectric electrode 3 is formed on the same surface as the discharge electrode 2, and includes a plurality of planar electrode portions 3 a disposed between the linear portions 2 a of the discharge electrode 2, and ends thereof. The lead wire connection port 3d for connecting to the power supply circuit 5 is formed in a part of the conductor 3b. The planar electrode portion 3a is formed with a recess 8 that is cut out in a triangular shape facing the needle electrode portion 2b, and the needle electrode portion 2b is disposed in this recess.

  The discharge electrode 2 and the dielectric electrode 3 can be formed on the substrate 1 using gold by a thick film printing / firing method. Further, the discharge electrode 2 and the dielectric electrode 3 are patterned by etching after a conductor is formed on the substrate 1 by screen printing directly by screen printing or by thick film printing / firing on the substrate 1. A scheme can be adopted.

  Crystallized glass can be used as the insulator 4 (dielectric) formed between the discharge electrode 2 and the dielectric electrode 3. Crystallized glass can be formed by screen printing and baking a crystallized glass paste in a predetermined pattern.

In the ion generating element configured as described above, ions are generated between the electrodes 2 and 3 when a voltage is applied from the power supply circuit 5. As ions, H ₃ O ⁺ (H ₂ O) _m is generated as positive ions, and O ₂ ⁻ (H ₂ O) _n (m and n are natural numbers) are generated as negative ions.

Then, when the positive ion and the negative ion are chemically reacted, at least one of hydrogen peroxide H ₂ O ₂ , hydrogen dioxide HO _2, or hydroxy radical / OH having high decomposition ability is generated by the following reaction. .

H ₃ O ⁺ + O ₂ ⁻ → OH + H ₂ O ₂
H ₃ O ⁺ + O ₂ ⁻ → HO ₂ + H ₂ O

    In addition, since the ion generating electrodes 2 and 3 are arranged adjacent to each other on the same plane, the ion generating discharge region 7 in the air is widened, and the amount of ion generation is increased. Further, since the electrodes 2 and 3 arranged in the lateral direction are covered with the insulator 4, the distance between the electrodes can be reduced, and as a result, ions can be generated at a low voltage. Furthermore, by interposing the needle electrode portion of the discharge electrode in the concave portion of the dielectric electrode, the area occupied by the discharge electrode and the dielectric electrode as compared with the case where the needle electrode portion and the planar dielectric electrode portion face each other as they are. The ion generating element can be formed compactly, and a larger ion effect can be obtained without increasing the area of the ion generating electrode portion.

  Next, the following samples (No. 1 to No. 5) were prepared, and the effect of the present invention was confirmed.

(Sample No. 1)
Thick film printing gold paste (TR-114G manufactured by Tanaka Kikinzoku Kogyo Co., Ltd.) on an alumina sintered substrate 1 containing 96% alumina in a weight ratio of thickness 0.4 mm and size (horizontal / vertical dimension) 18 mm × 15 mm. 2), a predetermined pattern including a discharge electrode 2 having a needle-like electrode portion 2b as shown in FIG. 2 and a dielectric electrode 3 having a recess 8 in which the needle-like electrode portion 2B intervenes is obtained by screen printing. Printed and fired at 850 ° C. The minimum distance between the formed discharge electrode 2 and dielectric electrode 3 was set to 0.25 mm.

  Next, a crystallized glass paste (LS653 manufactured by Tanaka Kikinzoku Kogyo Co., Ltd.) was formed by screen printing and firing (850 ° C.) so as to have a predetermined pattern (region surrounded by the thin ink lines 4 in FIG. 2).

(Sample No. 2)
Thick film printing gold paste (TR-114G manufactured by Tanaka Kikinzoku Kogyo Co., Ltd.) on an alumina sintered substrate 1 containing 96% alumina in a weight ratio of thickness 0.4 mm and size (horizontal / vertical dimension) 18 mm × 15 mm. ) Was used to print gold on the entire surface of the substrate 1 by screen printing and baked at 850 ° C. Then, after forming a photoresist resin for etching by spin coating, a photomask having a predetermined pattern (pattern drawn with dark ink) as shown in FIG. An etching resist film was formed by irradiation and photoresist etching.

  Next, after etching the gold with a potassium iodide-based etching solution, the photoresist was removed with a resist stripping solution. The minimum distance between the formed discharge electrode 2 and dielectric electrode 3 was set to 0.05 mm.

  Next, a crystallized glass paste (LS653 manufactured by Tanaka Kikinzoku Kogyo Co., Ltd.) was formed by screen printing and firing (850 ° C.) so as to have a predetermined pattern (region surrounded by the thin ink lines 4 in FIG. 2).

(Sample No. 3)
As an insulating coating film, an amorphous glass (AP5349 manufactured by Asahi Glass Co., Ltd.) was used and the firing temperature was 810 ° C. Sample preparation was performed by the same method as 2 samples.

(Sample No. 4)
In order to confirm the effect of the present invention, as a comparative example, the sample Nos. Shown in FIGS. 4 was produced. Sample No. 4 is for thick film printing on one surface (surface A) of an alumina sintered substrate 101 containing 96% alumina in a weight ratio of 0.25 mm thickness and size (horizontal / vertical dimensions) 18 mm × 15 mm. Using gold paste (TR-114G manufactured by Tanaka Kikinzoku Kogyo Co., Ltd.), a pattern indicated by dark ink 102 in FIG. 4 was printed by screen printing, and baked at 850 ° C.

  Next, using the same gold paste on the back surface (B surface) of the substrate 101, a pattern indicated by light ink 103 in FIG. 4 (however, no recess is formed in the planar electrode portion) is printed and fired (850 ° C.). ) To form. Thereafter, dielectric 104 for insulating coating (region surrounded by thin ink lines: LS653 made by Tanaka Kikinzoku) was printed on the A surface of the substrate 101 and baked at 850 ° C.

(Sample No. 5)
Sample No. A conductor pattern was formed in the same manner as in 1. However, an insulator (insulating dielectric layer) was not formed.

[Ion generation amount]
For Sample Nos. 1 to 5, the amount of generated ions was examined. In the ion generating element, the potential between the peaks of the AC voltage was increased from 2.0 kV in increments of 0.5 kV by the power supply circuit 5 to a maximum of 4.0 kV. The frequency was 40 kHz.

  The amount of ion generation was measured at a distance of 25 cm from the ion generation electrode using an air ion counter (model number 83-1001B-II) manufactured by Dan Kagaku Co., Ltd. Table 1 shows the measurement results of the amount of ions.

  As shown in Table 1, the discharge electrode 2 and the dielectric electrode 3 were directly patterned in the same plane of the substrate 1, and the sample no. 1 shows a sample No. 1 in which electrodes 102 and 103 are formed on both surfaces of a substrate 1 with an insulator (dielectric) sandwiched therebetween. Compared with 4, the amount of generated ions is 1.5 times or more. Sample No. Sample No. 5 1 and the insulator 4 was not formed, but it can be seen that if the insulator 4 is not formed, ions are not generated.

  Further, a pattern was formed by etching, and the sample no. 2 and sample No. 3 are sample no. The amount of ions generated is larger than 1. Sample No. 2 and no. 3 shows that the ion generation start voltage is the sample No. 3. This is smaller than 1 3 kVp-p, and ions can be generated at a lower voltage. For this reason, since the power consumption of an ion generating element can be made small and a circuit component can be reduced in size, it is possible to produce a small and portable ion generating element.

[Insulation breakdown voltage]
Next, sample No. 2 and sample no. In order to investigate the variation in the insulation breakdown voltage of the three ion generating elements, a voltage of AC 2 kV was applied between each of the 50 ion generating electrodes to examine whether or not dielectric breakdown would occur. The results are shown in Table 2.

  As shown in Table 2, sample No. 1 coated with amorphous glass as an insulator was used. In No. 3, the breakdown occurred in 3 out of 50 units, whereas sample No. 3 coated with crystallized glass as an insulator was used. In No. 2, no sample caused dielectric breakdown in 50 units.

Schematic diagram showing a cross section of an ion generating element according to the present invention Schematic diagram showing a plan view of an ion generating element according to the present invention. Schematic diagram showing the cross section of the ion generating element of the comparative example Schematic diagram showing a plan view of an ion generating element of a comparative example

Explanation of symbols

1 Substrate (dielectric)
2 electrode 2a linear part 2b acicular electrode part 2c conductor 2d connection port 3 electrode 3a planar electrode part 3b conductor 3d connection port 4 insulator 5 power circuit 6 electric field line 7 ion generation region 8 concave part

Claims (11)

In a creeping discharge type ion generating element, a discharge electrode and a dielectric electrode constituting an ion generating electrode are arranged to face each other in the same plane, and a concave portion is formed in the dielectric electrode, and a needle-like electrode of the discharge electrode is formed in the concave portion. An ion generating element, wherein the discharge electrode and the dielectric electrode are covered with an insulator. The discharge electrode is formed such that a plurality of needle-like electrode portions are formed at an interval perpendicular to the linear portion, and a plurality of recesses are formed on the dielectric electrode so as to face the plurality of needle-like electrode portions. The ion generating element according to claim 1. In the discharge electrode, a plurality of linear portions are arranged in parallel and ends thereof are connected by a conductor, and a plurality of needle-like electrode portions are formed at intervals so as to be orthogonal to the respective linear portions. The needle-like electrode portions of the adjacent linear portions are arranged in a staggered manner, and the planar electrode portions of the dielectric electrodes are arranged between the linear portions and the ends thereof are connected by a conductor. The ion generating element according to claim 1. The ion generating element according to claim 1, wherein the ion generating electrode is patterned on a substrate by a thick film printing / firing method. The ion generating element according to claim 1, wherein the ion generating electrode is formed by patterning by etching the conductor after the conductor is formed on the substrate by a thick film printing / firing method. . The ion generating element according to claim 4, wherein an alumina sintered body is used as the substrate. The ion generating element according to claim 4, wherein gold is used as the ion generating electrode. The ion generating element according to claim 1, wherein crystallized glass is used as the insulator, and the crystallized glass is formed by a thick film printing / firing method. The ion generating element according to claim 1, wherein the insulator is formed by screen-printing a crystallized glass paste and firing it. The positive ions generated from the ion generating electrode are H ₃ O ⁺ (H ₂ O) _m (m is a natural number), and the negative ions are O ₂ ⁻ (H ₂ O) _n (n is a natural number). The ion generating element according to any one of claims 1 to 9. The positive ions and negative ions generated from the ion generating electrode are chemically reacted to generate at least one of hydrogen peroxide H ₂ O ₂ , hydrogen dioxide HO _{2, and} hydroxy radicals · OH. Item 11. The ion generating element according to any one of Items 1 to 10.