JP2000327964A - Electrode ink for electronic parts and method of manufacturing the same, and ink jet apparatus, ink jet cleaning liquid and method of manufacturing electronic parts - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide an electrode ink for electronic components, a method for producing the same, an ink jet apparatus, and the like, which can stably produce electronic components. SOLUTION: By providing an electrode ink for electronic parts which does not easily settle, stable printing becomes possible because it does not spontaneously settle, and if necessary, a water-soluble ink is used to reduce the thickness of the ceramic to 20 μm or less. Various electronic components can be manufactured with high yield without redissolving the ceramic raw sheet even when printing directly on the raw sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component mainly used for manufacturing ceramic electronic components, such as multilayer ceramic capacitors, LC filters, and composite high frequency components, which are widely used in various electronic devices, using an ink jet. The present invention relates to an electrode ink and a method for manufacturing the same, and an ink jet device, a method for manufacturing an ink jet cleaning liquid, and an electronic component.

[0002]

2. Description of the Related Art Conventionally, ceramic electronic components have often been manufactured by a printing method using a plate such as screen printing or gravure printing. However, such a method is suitable for mass production, but it is difficult to make small turns in recent years in the production of small lots and many kinds. Therefore, as a new printing method, it has been proposed to use an ink jet for manufacturing a ceramic electronic component.

First, a general ink jet ink will be described. General inks for ink jet are of a dye type or a pigment type, and these are volatilized or deteriorated by firing, and thus cannot be used as an electrode material, a dielectric material, or a magnetic material. For example, U.S. Pat. No. 3,889,270 proposes an ink jet ink for printing on paper. U.S. Pat. No. 4,150,997 proposes a water-based fluorescent ink for an ink jet and a method for producing the same, but these inks are for coloring and cannot be applied to electronic components. U.S. Pat. No. 4,894,092 proposes heat-resistant pigments, but these are for coloring and cannot be applied to electronic components. In U.S. Pat. No. 4,959,247, an electrochromic coating and a method for producing the same are introduced.
These cannot be applied to electronic components. US Patent 5,0
Japanese Patent No. 34,244 discloses a method of forming a heat-resistant pattern for glass using an inorganic ceramic pigment, but an electronic component cannot be manufactured with such a pigment-based ink.

Next, an ink jet ink used for coloring a ceramic substrate will be described. US Patent 5,2
No. 73,575 discloses an ink jet ink prepared by dissolving various metal salts (Matallicsalt) in a solvent in place of a pigment for coloring a ceramic substrate (for example, black, brown, green, and brilliant blue). is suggesting. U.S. Pat. No. 5,407,474 proposes an ink for ink jet for coloring a ceramic substrate in which the particle diameter of the inorganic pigment is limited. US Patent 5,714,2
No. 36 proposes an ink for coloring a ceramic substrate prepared by mixing various metal salts with a combustible material serving as an oxygen supply substance.

[0005] However, such an ink for ink jet can be used as an internal electrode, a dielectric material or a magnetic material, for example, even though coloring and printing such as marking of ceramic electronic parts are possible. Japanese Patent Publication No. 5-77474 and Japanese Patent Application Laid-Open No. 63-283981 propose a firing type decorating method for a ceramic base material using a chelate. Japanese Patent Publication No. 6-21255 proposes a firing type marking ink comprising a silicone resin, an inorganic color pigment and a solvent. In addition, Japanese Patent Laid-Open No.
No. 26 proposes a marking ink for a ceramic substrate using a soluble metal salt. Japanese Patent Laid-Open No. 5-26
No. 2,583 proposes a marking method in which an acidic aqueous solution in which a soluble metal liquid is dissolved is applied on a ceramic base material, and then an alkaline aqueous solution is applied so as to neutralize the metal salt, followed by firing.

Japanese Patent Application Laid-Open No. Hei 7-330473 proposes a marking method in which an ink composed of an aqueous solution of metal ions is printed in a predetermined shape on a ceramic substrate by an ink jet and baked. JP-A-8-127747 proposes a marking ink for coloring a ceramic substrate containing a metal pigment. However, electronic parts cannot be manufactured with such ceramic coloring inks.

Next, a description will be given of how an etching resist used for manufacturing an electronic component or the like is formed by an ink jet method. U.S. Pat. No. 5,567,328 proposes that when a circuit board is manufactured, a resist pattern to be an etching resist is formed by an ink jet method. Similarly, Japanese Patent Application Laid-Open No. 60-175050 proposes that a resist pattern to be an etching resist be formed three-dimensionally on a metal film on a substrate by an ink jet method. However, the use of such an etching resist increases the production cost of electronic components. As described above, with such an ink jet method or ink for an ink jet, electronic components cannot be used at low cost.

Next, a proposal for manufacturing various electronic parts by the ink jet method will be described. Conventionally, it has been proposed to use an ink jet device for manufacturing electronic components. JP-A-58-50795 has proposed a method of forming a conductor and a resistor on an unfired ceramic substrate by ink jet. As described in this proposal, in the case of forming an electronic circuit on a substrate by the conventional ink jet method, in order to solve the problem that the ink for forming the electronic circuit is easy to flow or spread on the substrate, the ink is not fired on the printing medium. Using a ceramic raw sheet, an ink containing a powder such as a conductor or a resistor in an organic dispersion medium that is easily absorbed by the ceramic raw sheet of the ink at the head is formed by ink jet, and the obtained substrate is fired. A predetermined electronic circuit is formed.

[0009] In addition, a method of manufacturing an electronic component by ink jet has been proposed. For example, JP-A-8-22247
Japanese Patent Application Laid-Open No. 5 (1999) -2005 proposes a method for manufacturing a thick-film electronic component in which a thick-film ink is applied to an internal electrode pattern using an ink-jet apparatus, and is laminated and fired. In this case, conductive ink or ink for a resistive film is applied to the surface of the ceramic raw sheet in a predetermined pattern shape by an ink jet device. JP-A-59-82793 proposes forming a conductive adhesive or a low-temperature firing conductor paste at a predetermined connection position on a printed circuit board by an ink jet method. Japanese Patent Application Laid-Open No. 56-94719 proposes that a reverse pattern of the internal electrodes can be manufactured by spraying ceramic ink by spraying in order to eliminate a step due to the thickness of the internal electrodes in the multilayer ceramic capacitor. Similarly, JP-A-9-21933
In Japanese Patent Application Laid-Open No. 9-204, in order to eliminate a step due to the thickness of an internal electrode in a multilayer ceramic capacitor, a ceramic ink is applied to the surface of a ceramic green sheet by an ink jet, and if necessary, an electrode ink is also formed by an ink jet. Proposed.

In this proposal, a continuously formed long ceramic green sheet formed on a carrier film is continuously guided to an internal electrode application station, a ceramic ink application station, and a punching station.
A multilayer ceramic electronic component will be manufactured. In order to absorb the thickness of the internal electrode in this way, printing a ceramic ink on a portion (remaining portion) of the ceramic green sheet on which the internal electrode is printed, where the internal electrode is not formed, is disclosed in Japanese Unexamined Patent Publication (Kokai). It is also proposed in JP-A-52-135051.

Further, in Japanese Patent Application Laid-Open No. 9-232174,
Similarly, it has been proposed that a functional material paste such as a conductive paste or a resistance paste is jetted together with a ceramic paste by an ink jet method to manufacture an electronic component such as a laminated inductor. As a method of manufacturing such a laminated inductor without using a via hole, US Pat.
No. 2,698 proposes a method of manufacturing a laminated coil while alternately forming insulating layers so that part of a coil pattern is exposed to each other. And JP-A-48-81
No. 057 proposes a method of laminating coils via via holes formed in a ceramic raw sheet.

In Japanese Patent Application Laid-Open No. 2-65112,
It has been proposed to improve the characteristics of a semiconductor capacitor by uniformly injecting a required amount of a dopant liquid in the form of a droplet onto a device surface by ink jet at the time of manufacturing a semiconductor capacitor. In this case, in order to dissolve the ionizable salts of the metal, the ink for ink jet is prepared by dissolving it in ethanol or an acid for adjusting pH. When the electronic component forming member is dissolved in the ink as described above, no precipitate or aggregate is generated in the ink. Japanese Patent Application Laid-Open No. Hei 7-330473 discloses a method for forming a predetermined image on a ceramic surface instead of an electronic circuit on the ceramic surface.
Japanese Patent Publication No. 3-283981 proposes using an organic metal chelate compound, Japanese Patent Publication No. 5-69145 proposes adding water glass, and Japanese Patent Publication No. 6-21255 proposes adding a silicone resin. . However, these proposals are images and cannot form an electronic circuit as proposed by the present invention.

However, in the conventional method of manufacturing various electronic parts by ink jet, although a manufacturing method has been proposed, an ink for electronic parts which is practically used has not been proposed. This has a problem that ink containing powder of a metal or the like required for manufacturing such electronic components easily aggregates and easily clogs a jet port of an ink jet apparatus.

Next, as an example of the prior art, an example was shown in which an electrode ink for electronic parts (Ni screen ink for an internal electrode of a multilayer ceramic capacitor) was diluted with butyl acetate to lower the viscosity, and it was tested whether it could be used as an ink jet ink. This will be described with reference to FIG. FIG. 10 is a view showing a state in which the electrode ink is jetted onto the ceramic raw sheet by an ink jet.

In FIG. 10, a ceramic raw sheet 2 is formed on a base film 1. This ceramic raw sheet 2 is prepared by dissolving butyral resin in butyl acetate, dispersing barium titanate therein, further adding a phthalic acid-based organic solvent as a plasticizer, and drying the base film 1 on the base film 1 with a coating machine to a thickness of 30 μm. What was formed so that it might become.

Reference numeral 3 denotes an ink jet device, and an electrode ink 5 built in from a nozzle 4 formed at the tip of the ink jet device.
Is ejected as needed to form ink droplets 6. The ejected ink droplets 6 adhere to the ceramic raw sheet 2 to form an electrode pattern 7. The arrow 8 shows how the solvent component permeates from the electrode pattern 7 into the inside of the ceramic green sheet 2. As described above, when the solvent-based electrode ink 5 adheres to the ceramic raw sheet 2, the solvent component contained in the electrode pattern 7 permeates the ceramic raw sheet 2 and causes a short circuit.
No. 25381 is pointed out. Reference numeral 9 denotes aggregates generated in the electrode ink 5, and such aggregates 9 precipitate in the electrode ink 5 and clog the nozzles 4.

As described above, even if the electrode ink 5 is produced as a trial for ink jet printing, there is a problem that a stable printing quality cannot be obtained because the nozzles 4 are clogged due to agglomerates in the ink. Almost all commercially available electrode inks for electronic components are also diluted with an organic solvent. Therefore, when printed on a ceramic raw sheet 2 having a thickness of 20 μm or less, the solvent component dissolves the ceramic raw sheet 2 and causes a short circuit. The problem of causing defects such as failures has also been pointed out.

Conventionally, various proposals have been made to solve such problems in the case of paper ink. For example, Japanese Patent Application Laid-Open No. 5-229140 proposes that an ink jet ink containing an inorganic pigment is sent to a printing head while stirring in an ink supply chamber. JP-A-57-70667, JP-A-53-61232, JP-A-56-19765, and JP-A-60-11
No. 0458, Japanese Patent Application Laid-Open No. 5-338195, and the like have proposed a method of stirring ink in an ink tank with a magnetic stirrer or the like. Also, JP-A-4-12516
No. 1 and Japanese Patent Application Laid-Open No. H5-263028 propose that pressure filtration is performed using a metal filter.
In the case of inks for electronic parts, even higher precision inks are required, and there is no practical ink for electronic parts. The present inventors tried to lower the viscosity by diluting commercially available inks for various electronic components for screen printing by trial, and further filtered using a metal filter or the like, and tried to print with a commercially available ink jet apparatus. However, the metal powder and the ceramic powder in the ink immediately precipitated and ink jet printing could not be performed. Then, the ink was sent to the print head while stirring to prevent sedimentation. However, particles in the ink settled in the print head and clogged the head. High density like ink for electronic parts,
An ink jet apparatus capable of stably printing a low-viscosity, high-density ink for ink jet has not been commercially available.

[0019]

As described above, inks using dyes or metal salts have been conventionally proposed. However, electronic parts printing which can stably print inks for electronic parts which are liable to cause precipitation and aggregates. No ink jet device has been proposed. Even if such an ink for electronic parts is filtered through a high-precision filtration equipment after production, it precipitates or re-aggregates in the ink jet apparatus. Therefore, in the conventionally proposed ink jet apparatus, the print head for the ink jet and the ink ejection port are easily packed, and stable printing is difficult. Ink for electronic components for ink jets that can be printed stably uses dyes or metal salts for the purpose of coloring, etc., and cannot be used for the production of electronic components such as LC filters and high-frequency components. Was. Further, when manufacturing a multilayer ceramic electronic component, or when an electrode ink or the like is printed on a ceramic green sheet having a thickness of 20 μm or less without using the ink jet method, the solvent component in the electrode ink stains the ceramic green sheet. In some cases, it may be a cause of defects such as short circuit and short circuit.

By using the ink jet device for printing electronic parts proposed in the present invention, an ink for electronic parts, a method of manufacturing each electronic part, a method of manufacturing a laminated electronic part, etc., which could not be printed conventionally, are proposed. The purpose is to do. For example, it is also possible to attach only an ink circulation mechanism which is a part of the ink jet device for printing electronic parts of the present invention to a commercially available ink jet device. By doing so, it is possible to print stably inks having poor printing stability, such as inks for electronic parts. In addition, by using the ink jet device for printing electronic parts proposed in the present invention, it was impossible to print with the conventional ink jet,
It is possible to newly print even an ink which is likely to cause high concentration precipitation or aggregation.

Further, in the present invention, by proposing a new water-soluble electrode ink for electronic parts, the electrode ink for electronic parts can be directly formed on a ceramic green sheet having a thickness of 20 μm or less. Even when printed by the printing method, the ceramic raw sheet does not swell or redissolve. Therefore, short-circuiting does not occur even in a thin ceramic raw sheet having a thickness of 20 μm or less, which is short-circuited with the conventional electrode ink. Thus, in the present invention, regardless of the printing method,
Multilayer ceramic electronic components can be manufactured with high yield. Furthermore, by using this water-soluble electrode ink for electronic parts,
Not only fire prevention but also printing work environment can be greatly improved.

[0022]

SUMMARY OF THE INVENTION In order to solve these problems, the present invention provides an electrode ink for electronic parts which can be printed by an ink jet apparatus, a method for manufacturing the same, or a dedicated ink jet apparatus and a method for manufacturing electronic parts. This prevents precipitation and re-aggregation of the electrode ink for electronic components, and enables stable printing. Further, even when the electrode ink or the like is printed on a ceramic green sheet having a thickness of 20 μm or less, the solvent component in the electrode ink does not seep into the ceramic green sheet, and thus does not cause a defect such as a short circuit.

As a result, an ink jet apparatus for printing electronic parts capable of performing stable printing for a long time can be obtained, and electronic parts can be stably manufactured at a high yield. In addition, by utilizing the features of on-demand (manufacturing a product in a short time as needed), which is a feature of an ink jet, various electronic components can be provided to a user in a short delivery time. Further, in the present invention, by proposing a new water-soluble electrode ink for electronic parts, the electrode ink is directly printed on a ceramic green sheet having a thickness of 20 μm or less by a printing method such as an ink jet, screen, or gravure. Neither does it swell or redissolve the green ceramic sheet. For this reason, a 15 μm
No short circuit occurs even for the following thin ceramic thin sheets. Thus, according to the present invention, a multilayer ceramic electronic component can be manufactured with a high yield regardless of the printing method. Further, by using the present water-soluble electrode ink for electronic parts, it is possible to not only prevent fire but also to greatly improve the printing work environment.

Thus, a multilayer ceramic capacitor,
Electronic parts such as ceramic electronic parts such as LC filters and composite high-frequency parts can be stably produced by using the ink jet method, and various electronic parts can be reduced in cost and delivery time can be shortened.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present invention, a metal powder having a size of 10 μm or less is dissolved in water or an organic solvent.
Weight% or more and 80 weight% or less, viscosity 2 poise or less, and precipitation is 10 mm or less in 10 minutes or 20 m in 100 minutes.
m, which is an electrode ink for electronic parts having an average particle size of not more than m.

According to a second aspect of the present invention, a metal powder having a particle size of 10 μm or less and a ceramic powder having a particle size of 10 μm have a viscosity of not less than 1% by weight and not more than 80% by weight in water or an organic solvent.
Electrode ink for electronic components dispersed below poise.By adding metal powder and ceramic powder to the ink, thermal expansion of metal and ceramic parts even when used for internal electrodes etc. of multilayer ceramic electronic components Since the coefficients can be matched, it is possible to prevent the occurrence of defects such as delamination even when an internal electrode or the like is formed by an ink jet, and has the effect of reducing the cost of ink.

According to a third aspect of the present invention, there is provided an electronic component comprising a metal powder having a particle size of 10 μm or less and a metal oxide dispersed in water or an organic solvent at a concentration of 1 to 80% by weight and a viscosity of 2 poise or less. This is an electrode ink, and since the metal powder and metal oxide are added together, even when used for internal electrodes of multilayer ceramic electronic components, the thermal expansion coefficients of the metal part and the ceramic part can be matched. Thus, even if an internal electrode or the like is formed, the occurrence of defects such as delamination can be prevented, and the effect of reducing the cost of ink can be obtained.

According to a fourth aspect of the present invention, there is provided an electronic component comprising a metal powder having a particle size of 10 μm or less dispersed in water or an organic solvent in an amount of 1 to 80% by weight and a viscosity of 2 poise or less together with an organic metal compound. Electrode ink, with metal powder and organometallic compound added together to improve the dispersibility of metal powder in water or organic solvents, improve the uniformity of internal electrodes, This has the effect that the pattern can be easily formed and the cost of the ink can be reduced.

According to a fifth aspect of the present invention, a metal powder having a thickness of 10 μm or less and a ceramic material formed on the surface thereof has a viscosity of 1 to 80% by weight in water or an organic solvent and a viscosity of 2 to 80% by weight.
An electrode ink for electronic components that is dispersed below the poise.When a ceramic material is formed on the surface of metal powder, even when used for internal electrodes of multilayer ceramic electronic components, the heat of the metal part and the ceramic part is reduced. Since the expansion coefficients can be matched, it is possible to prevent the occurrence of defects such as delamination even when an internal electrode or the like is formed by an ink jet, which has the effect of reducing the cost of ink.

According to a sixth aspect of the present invention, there is provided:
The metal powder is dispersed in water or an organic solvent at a concentration of 1% by weight to 80% by weight and a viscosity of 2 poises or less in water or an organic solvent together with a ceramic powder or an organic metal compound or other additives using beads having a diameter of 10 mmφ or less. This is a method for producing an electrode ink for electronic components to be filtered, which has an effect of producing a high-yield, high-concentration, low-viscosity ink-jet electrode ink by dispersing metal powder with beads.

According to a seventh aspect of the present invention, the pressure is 5 kg / c.
A jig made of a hard material at a pressure of m ^{2 to} 3000 kg / cm ^{2 is} mixed with water or an organic solvent in an amount of 1% by weight to 8%.
This is a method for producing an electrode ink for electronic parts, in which the mixture is passed at least once in a state where the mixture is mixed at a concentration of 0% by weight or less and a viscosity of 2 poises or less, and then filtered with a filter. This has the effect of producing a high yield, high concentration, low viscosity electrode ink for ink jet.

According to the present invention, the metal powder is mixed with water or an organic solvent together with a ceramic powder or an organometallic compound or other additives so as to have a viscosity of 1 to 80% by weight and a viscosity of 2 poise or less. More than 1 second in state 10
This is a method for producing an electrode ink for electronic components that is ultrasonically dispersed within a period of time or less and then filtered through a filter.The electrode ink can be used as needed at any time without mixing impurities into the ink in the container by ultrasonic dispersion. Since the ink can be dispersed or redispersed, ink clogging can be prevented when the electrode ink for electronic parts is used in an ink jet apparatus, and there is an effect that printing with a high yield is enabled.

According to the ninth aspect of the present invention, the metal powder is mixed with water or an organic solvent together with a ceramic powder or an organometallic compound or other additives to have a viscosity of 1% by weight to 80% by weight and a viscosity of 2 poises or less. In a state, a rotation jig of 6 rpm or more and 10000 rpm or less is used for 1 second to 10 seconds.
After dispersing for less than an hour, it is a method of manufacturing an electrode ink for electronic parts that is filtered with a filter, without mixing impurities in the ink in the container by dispersing with a rotating jig,
Since the electrode ink can be dispersed or redispersed as needed at any time, ink clogging can be prevented when the electrode ink for electronic parts is used in an ink jet apparatus, and there is an effect that printing with a high yield can be performed.

According to a tenth aspect of the present invention, the electrode ink for electronic parts having a viscosity of 2 poise or less in the ink tank is a first ink.
The surplus ink that has not been ejected after being sent to the ink jet ejecting section via the tube is collected by the ink tank via the second tube using an ink jet apparatus for printing electronic components having an ink circulation mechanism. There is an effect that the cost of the electronic component can be reduced since the ink can be used without waste by collecting and reusing the excess ink that has not been jetted.

According to a twelfth aspect of the present invention, the cleaning liquid is the first type.
After being sent to the ink jetting unit via the tube, the electronic component printing ink jet device is washed, and the excess cleaning liquid not jetted from the electronic component printing ink jet device is passed through the second tube. An ink jet device for printing electronic components having an ink washing mechanism to be collected. Since the inside of the ink jet device can be washed with a washing liquid as required, there is an effect that occurrence of printing defects such as ink clogging can be prevented.

According to a thirteenth aspect of the present invention, there is provided an ink jet apparatus cleaning liquid containing a detergent, a dispersant, a chelating agent or a chelating resin in an amount of 0.01 g to 200 g per 100 g of water or an organic solvent. Since the metal powder and additives remaining inside can be washed and removed, maintenance of the ink jet device can be reliably and easily performed, and the manufacturing cost when manufacturing electronic components by the ink jet technology can be reduced.

According to a fourteenth aspect of the present invention, the electrode ink for electronic parts according to the first to fifth aspects is formed in a predetermined pattern on a ceramic green sheet or a ceramic substrate by using an ink jet apparatus and then laminated or fired. rear,
This is a method for manufacturing an electronic component that is singulated and mounted with an external electrode. By using the electrode ink for an electronic component proposed in the present invention using an ink jet device, a predetermined electronic component can be provided to the market in a short delivery time and at low cost. .

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

(Embodiment 1) In the electrode ink for electronic parts according to Embodiment 1, a metal powder having a particle size of 10 μm or less is dispersed in water or an organic solvent to have a viscosity of 1% by weight to 80% by weight and a viscosity of 2 poises or less. Is what it is.

This electrode ink for electronic parts was prepared by firstly adding 200 g of Ni powder having a particle diameter of 0.4 μm, and adding 1 part of an additive or resin.
g and 150 g of organic solvent or water. Here, silver palladium, platinum, palladium, nickel or the like is added as the metal powder. As an additive, a phthalic acid-based solvent such as butyl phthalate or polyethylene oxide is added. By adding a cellulose-based resin, a vinyl-based resin, a petroleum-based resin, or the like as the resin, it is possible to improve the binding force of the printed coating film and to increase the strength of the dried ink. As organic solvents,
Alcohols such as ethyl alcohol and isopropyl alcohol, ketones such as acetone and methyl ethyl ketone,
An ester such as butyl acetate or a hydrocarbon such as naphtha is added.

If necessary, dispersants such as fatty acid esters, polyhydric alcohol fatty acid esters, alkyl glycer ethers and their fatty acids, various lecithin derivatives, propylene glycol fatty acid esters, glycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyglycerin fatty acid esters, By adding sorbitan fatty acid ester, polyoxyethylene alkyl ether, or the like, the dispersibility of the powder becomes good, and precipitation due to reagglomeration of the powder can be prevented.

Next, dispersion is performed for 3 hours using zirconia beads having a diameter of 0.5 mm. Thereafter, the solution is filtered using a membrane filter having a pore diameter of 5 μm to prepare an organic solvent-based electrode ink having a viscosity of 2 poise.

FIG. 1 shows the sedimentation of the electrode ink for various electronic parts. The X-axis shows the elapsed time (unit is minute), and the Y-axis shows the thickness of the supernatant layer (unit is mm). FIG. 2 shows an example of measurement of sedimentation of inks for various electronic parts. In FIG. 2, 10 is a glass tube, 11 is an electrode solution, and 12 is a supernatant layer. To measure the sedimentation of the electrode ink for electronic parts, as shown in FIG.
A predetermined amount of the electrode solution 11 in a dispersed state is poured into 0 (preferably at least 10 mm in diameter and at least 10 cm in depth), and the state of the electrode solution 11 is observed with the lapse of time. Then, the supernatant layer 12 gradually increases on the upper surface of the electrode solution 11.
Are formed, and the thickness of the supernatant layer 12 increases as the elapsed time increases. The thickness of the supernatant layer 12 thus measured is
FIG. 1 shows a graph of the elapsed time.
Generally, the electrode solution 11 is black and does not transmit light because it contains a predetermined amount of metal powder. On the other hand, the supernatant layer 12 is transparent and transmits light because it hardly contains metal powder. Thus, the electrode solution 11 and the supernatant layer 12 are optically distinguishable. The supernatant layer 12 and the electrode solution 11 can be easily distinguished from each other in terms of specific gravity and solid content of each solution.

In FIG. 1, A, B, and C show the results of measurement of the sedimentation of the electrode ink for each electronic component. Among A to C, A is the least likely to precipitate, and C is the most. It's easy to do. B shows that the thickness of the supernatant layer after 10 minutes is 10 mm, 1
The thickness of the supernatant layer after 00 minutes is 20 mm. As the electrode ink for electronic parts used in the ink jet, it is desirable to use an ink having the same or lower sedimentation rate than B. In the case of the electrode ink for electronic parts which easily precipitates as shown in A, stable printing cannot be performed because precipitation occurs inside the ink jet device.

In order to reduce the sedimentation rate, it is effective to adsorb various resins on the surface of the metal powder contained in the electrode ink for electronic parts. To preferentially adsorb the resin to the metal powder, a carboxylic acid or fatty acid having a carboxyl group in the side chain of the resin, or a polycarboxylic acid resin having a plurality of carboxyl groups is preferable. In addition, a resin containing a hydroxyl group in addition to a carboxyl group is also easily adsorbed on the powder surface, and has an effect of preventing precipitation.

In order to prevent precipitation of the ink powder, the particle diameter is preferably 10 μm or less, though it depends on the specific gravity of the powder.
When the particle size is larger than 10 μm, it is difficult to make the precipitation rate slower than B in FIG. 1 even if the absolute value of the surface potential of the metal powder is increased or various fatty acid-based resins are adsorbed on the surface.
Further, by increasing the ratio of the metal powder, particularly the powder having a size of 1 μm or less, the sedimentation speed of the powder can be reduced as shown in FIG.

The content of the metal powder in the ink is preferably from 1% by weight to 80% by weight. When the content is 0.5% by weight or less, the metal powder hardly precipitates (according to our experiments, it was considered that the average distance between the powders was large and hard to collide). In many cases, conduction cannot be obtained. In the case of a high-concentration ink of 90% by weight or more, the average distance between metal powders is too short.
No matter how much the zeta potential was increased, it was agglomerated in a short time or gelled when left standing after dispersing, making stable printing difficult even with an ink circulation device, which was unsuitable for the production of electronic components . For inks for electronic parts that easily aggregate or gel in a short time, by using the ink circulation mechanism proposed in the present invention as needed, long-term stable printing can be obtained, and various electronic parts can be produced at high yield. Can be produced.

After ink jet printing, 2
By conducting a heat treatment at a temperature of from 00 ° C to 1500 ° C, conduction as an electrode ink can be obtained. The heat treatment temperature for conducting varies depending on the metal material, but the smaller the particle size, the lower the conduction temperature. In the case of an ink for ink jet prepared by the present inventors using Ni powder having a particle size of 0.5 μm, 10
Sintering started at about 00 ° C., but when using 0.02 μm Ni powder, sintering was performed at a low temperature of about 400 ° C. Similarly, in the case of Ag powder of 1 μmφ, 800 ° C. to 900 ° C.
Although conduction was obtained at about the same level, conduction was obtained from about 300 ° C. after printing an ink using Ag powder of 0.01 μmφ on an alumina substrate with an ink jet apparatus for printing electronic components. Depending on the melting point of the material used and the particle size of the powder, the heat treatment temperature at which predetermined conduction can be obtained is different.
At temperatures between 00 ° C. and 1500 ° C., most of them can conduct.

Here, the reason why the particle size of the metal powder is 0.001 μm or more is that if it is less than 0.001 μm, it does not easily exist as a metal in a normal state. In particular, when powders of base metals such as nickel, copper, silver, aluminum, and zinc or alloys thereof are analyzed using a surface analyzer by ESCA, not only the surface layer but also the inside of the powders are transformed into oxide or hydroxide ceramic. I was The reason why it is 10 μm or less is that when it is larger than 10 μm, the metal powder tends to precipitate in the ink. The reason why the metal powder is 1% by weight or more is that if it is less than 1% by weight, electrical conduction may not be obtained after firing the ink. The reason why the content is 80% by weight or less is that when the content is 85% by weight or more, the ink tends to precipitate. In addition, the reason why the viscosity is set to 2 poise or less is that if the viscosity is too high, it is difficult to jet the ink stably from the ink jetting part, and even if the ink is jetted, the ink runs out poorly and the printing accuracy deteriorates. It is.

The electrode ink for electronic parts of the first embodiment is an organic solvent-based electrode ink, but may be a water-based electrode ink for electronic parts. This water-based electrode ink for electronic parts is
1 g of an additive or resin and 100 g of water or an aqueous (or water-soluble) organic solvent are added to 100 g of Ni powder having a particle size of 0.4 μm.
Add 50 g. Next, dispersion is performed for 3 hours using zirconia beads having a diameter of 0.5 mm.

Thereafter, filtration is performed using a membrane filter having a pore diameter of 5 μm to prepare a water-based electrode ink for electronic parts having a viscosity of 2 poise.

Here, as the aqueous (or water-soluble) organic solvent, ethylene glycol, glycerin, ethylene glycol or the like is added. As the resin, by adding a water-soluble resin such as a cellulose resin such as methylcellulose and carboxymethylcellulose, a vinyl resin such as polyvinyl alcohol, and a latex resin such as styrene-butadiene rubber, the binding force of the printed coating film is improved. After drying, the strength of the ink can be increased. Examples of dispersants include various lecithin derivatives, propylene glycol fatty acid esters, glycerin fatty acid esters, polyexethylene glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters, and polyethylene glycol. By adding fatty acid ester, polyoxyethylene alkyl ether, polycarboxylic acid or various soaps,
The dispersibility of the powder can be improved, and precipitation due to reagglomeration of the powder is prevented.

As described above, in particular, in the case of a water-soluble electrode ink, it is desirable to increase the absolute value of the zeta potential of the metal powder in the ink in order to reduce the precipitation rate of the ink. First, the present inventors, as a metal material, silver, palladium, platinum,
Experiments were performed on silver, copper, and nickel. The present inventors have developed ES
As a result of analyzing the surfaces of some metal powders using a surface analyzer such as CA, it was found that the powder surfaces were covered with an oxide layer or a hydroxide layer with a thickness of several nm. Therefore, it has been found that when added to water, the powder takes on a positive or negative zeta potential (depending on the pH of the liquid). Therefore, an additive was added to the ink to increase the surface potential.

According to the experiments of the present inventors, it was found that, in order to make the precipitation slower than in FIG.
It turned out that mV or more is desirable. In addition, depending on the powder and additives, the zeta potential is between pH 2 and pH 12,
60 mV to -70 mv (-100 mV depending on the case)
And the absolute value of the zeta potential can be extremely high (equal potential points could not be measured at the pH within the measurement area). Obtained. Thus, by setting the zeta potential of the metal powder to 40 mV or more in absolute value,
It is possible to provide an electrode ink for electronic parts which does not easily precipitate as shown in (B).

For comparison, various commercially available electrode inks (mainly for screen printing) such as Ni, silver and palladium were obtained and diluted with a special solvent.
As shown in (C), the sedimentation rate was high, and a printing experiment was attempted by actually setting the ink jet apparatus on a commercially available ink jet apparatus, but stable printing was not obtained.

In order to increase the surface potential of the metal powder, the following additives may be added in addition to the above-mentioned dispersant. Thus, the absolute value of the zeta potential of the metal powder was set to 50 mV.
The electrode ink for electronic parts, which is enhanced as described above and hardly precipitates as shown in FIG. 1B, can be produced.

Examples of the phosphate include sodium hexametaphosphate, polyoxyethylene-added linear alcohol phosphate, polyoxyethylene-added alkylphenol phosphate, alkyl phosphate, and the like. Examples of the anionic surfactant include a carboxylic acid salt such as a linear aliphatic salt, a coconut oil fatty acid salt, a tall oil fatty acid salt, an amine salt, N-lauroylsaccosin, and an acylated polypeptide. As sulfonates, linear alkylbenzene sulfonate, triethanolamine salt, isopropylamine salt, free sulfonate, higher alkylbenzene sulfonate hydrochloride, benzene, toluene, xylene, cumene sulfonate, lignin sulfonate, petroleum sulfonic acid Salts, N-acylalkyl taurine salts, n-paraffin sulfonates, α-olefin sulfonates, sulfosuccinates, alkylphthalene sulfonates, isethionates and the like. Examples of the sulfate include a linear primary alcohol sulfate (AS), a polyoxyethylene-added linear alcohol sulfate (AES), and a sulfated salt (sulfonated oil).

Examples of the cationic surfactant include linear amines, linear diamines, linear polyamines, linear quaternary ammonium salts (eg, tetraalkylammonium salts and N-alkyltrimethylammonium chloride), Ethylene-added linear amine, polyoxyethylene-added linear quaternary ammonium salt, amine oxide (for example, N
Cetyl dimethyl amine oxide or the like can be used as the alkyl dimethyl amine oxide). Examples of the nonionic surfactant include a polyoxyethylene-added nonionic surfactant, an ethylene oxide adduct of an alkylphenol (APE), an ethylene oxide adduct of a linear alcohol (AE), a polyoxyethylene adduct of a polyoxypropylene glycol, Polyoxyethylene adducts of linear mercaptans, linear aliphatic esters, glyceryl, polyglyceryl esters of natural fatty acids, propylene glycol, sorbitol, fatty acid esters of polyoxyethylene-added sorbitol, polyoxyethylene glycol esters, polyoxyethylene-added fatty acids ( Tall oil), alkanolamine-fatty acid condensate, alkanolamide, acetylene tertiary glycol, polyoxyethylene-added silicone, N-alkylpyrrolidone, alkyl Polyglycosides, etc. there.

Examples of the amphoteric surfactants include β-N-alkylaminopropionic acid, N-alkyl-β-iminodipropionic acid, isodazoline carboxysan, N-alkyl betaine, and pH-sensitive surfactants. There are amine oxides, and as the pH-insensitive surfactant, sulfovitane, saltin, and the like can be used.

In order to make the precipitation rate of the electrode ink for electronic parts proposed in the present invention slower than that shown in FIG. 1 (B), besides the addition of the above-mentioned dispersant and additives, the pH of the solvent is changed to the acid or alkali side. , The surface potential of the metal powder can be relatively increased, and an electrode ink for electronic parts as shown in FIG. 1 (A) is obtained, which is clearly more sedimented than that shown in FIG. 1 (B). Slow ink jet printing was obtained at a low speed.

FIG. 3 is a diagram illustrating a method for manufacturing a multilayer ceramic electronic component according to the first embodiment of the present invention. In FIG. 3, reference numeral 13 denotes a base film, on which a raw ceramic sheet 14 is formed. Reference numeral 15 denotes an electrode ink for electronic components, which is filled in an ink jet head 16. An element 17 is formed inside the ink jet head 16 and generates local heat and a piezoelectric effect. By the action of the element 17, ink droplets 18 are ejected from the ink jet head 16 as needed. The ink droplets 18 form ink patterns 19 on the upper surface of the ceramic raw sheet 14.
To form

First, a dielectric powder mainly composed of barium titanate having a particle diameter of 0.5 μm having X7R characteristics according to the EIAJ standard is dispersed together with a butyral resin, a phthalic acid-based plasticizer and an organic solvent to form a dielectric slurry. This dielectric slurry is filtered through a 10 μm filter and then applied on a base film 13 to form an organic ceramic raw sheet 14 having a thickness of 10 μm.

Next, as shown in FIG. 3, an internal electrode is formed from the upper surface of the raw ceramic sheet 14 from an ink jetting portion of an ink jet device described later with a print quality of 720 dpi. First, the electronic component electrode ink 15 described in the first embodiment is ejected on demand as small droplets by the built-in element 17 as needed. The ejected ink droplets 18 correspond to the ceramic raw sheet 14.
To form an ink pattern 19. By regularly arranging a few to several hundred elements (not shown) of the elements 17, a large number of ink droplets 18 are ejected at the same time, and the printing speed can be increased.

Next, while peeling the base film 13 from the ceramic raw sheet 14 having the ink pattern 19 in the previous step, several tens to several hundreds of the ceramic raw sheet 14 are formed on the uppermost and lowermost surfaces as necessary. The ceramic green laminate is formed by pressing and pressing from above with a press device.

Finally, the ceramic green laminate is cut into desired dimensions and singulated, and external electrodes electrically connected to the ink patterns 19 as internal electrodes are formed to produce a multilayer ceramic electronic component. Things. Thus, the organic ceramic green sheet 1 having a thickness of 20 μm or less
By using the water-based electrode ink, the electrode ink does not soak into the ceramic raw sheet 14 on the surface 4. Therefore, a short circuit included in the electrode pattern 7 as shown in FIG. 10 does not occur.

An ink jet apparatus used for forming an ink pattern to be an internal electrode of the multilayer ceramic electronic component manufactured as described above will be described with reference to the drawings.

FIG. 4 is a view for explaining the ink jet apparatus according to the first embodiment. In FIG. 4, reference numeral 20 denotes an ink tank, which is filled with the electrode ink 15 for electronic parts. Reference numeral 21 denotes a thermostat of the ink tank 20, and printing can be stabilized by maintaining the ink tank 20 and the internal electrode ink 15 for electronic parts at a constant temperature as needed. Reference numeral 22 denotes a first tube, which sucks the electronic component electrode ink 15 through a suction mechanism 23 including a pump or the like in the middle. The filter 24 can be inserted in the middle of the first tube 22 as needed. Thus, the suction mechanism 23 and the ink jet head 1
A filter 24 is provided in the first tube 22 between 6;
By filtering the electronic component electrode ink 15 immediately before printing, even if aggregates or precipitates are generated in the electronic component electrode ink 15 generated in the ink tank 20, it can be reliably removed. Next, the electronic component electrode ink 15 sucked from the ink tank 20 by the suction mechanism 23 is sent to the ink jet head 16 and the required amount of the ink is discharged to the printing medium (not shown) as an ink droplet 18 to the outside. Gushing. Then, the electronic component electrode ink 15 that has not been jetted by the ink jet head 16 is collected and reused in the ink tank 20 via the second tube 25. Reference numeral 26 denotes an adjusting suction mechanism that adjusts the pressure of the electronic component electrode ink 15 in the ink jet head 16 to stabilize the ink ejection amount.

The ink jet apparatus configured as described above is mounted on a portion corresponding to an ink cartridge attached to a commercially available ink jet printer, and used as an ink jet printing apparatus.

The printing stability of the ink jet device configured as described above is compared with that of the conventional ink jet device.

FIG. 5 is a diagram comparing the printing stability of the ink jet device according to the first embodiment with that of the conventional ink jet device. In FIG. 5, the X axis represents the number of continuous prints (unit is sheet), and the Y axis represents the Y axis. Is the amount of ink applied (unit is mg / cm
² ), and FIG. 5 shows the printing stability with an ink jet by comparing the relationship between the number of continuous prints and the amount of ink applied. In this figure, the white circles are from a conventional ink jet device that printed without circulating ink, and the amount of ink applied dropped sharply as the number of prints increased, and the ink ejection part clogged on the sixth sheet. I could not print. On the other hand, a 10 μm
In an ink jet apparatus that circulates the electrode ink 15 for electronic parts made using a plurality of metal powders of the same element having different particle diameters as described below, printing can be stably performed even when the number of sheets exceeds 200.

This is because flowing the electrode ink 15 for the electronic component through the inside of the first tube 22 causes the powder in the electrode ink 15 for the electronic component to move in a manner other than the Brownian motion. At the center of the tube, the shear speed (or the shear speed) is subjected to the shearing motion (or the shear speed) according to Hagen Poiseuille's law that maximizes the shear speed, so that the electrode ink 15 for an electronic component does not precipitate or re-aggregate. . Further, as shown in FIG. 1, the stability of the ink itself has also been increased, so that stable printing has become possible.

The present electronic component electrode ink 15 can be used for other printing such as gravure printing in addition to the ink jet method.

Also, various multilayer ceramic capacitors for TC (temperature compensation) can be manufactured by using the present technology. For example, CH type (0 ± 60 ppm / ° C), PH
Type (-150 ± 60ppm / ° C), RH type (-
A capacitor for temperature compensation (220 ± 60 ppm / ° C.) can be provided to the market with a shorter delivery time and lower cost by forming an internal electrode by an ink jet for a small variety of products.

(Embodiment 2) In the electrode ink for electronic parts according to Embodiment 2, metal powder and ceramic powder having different particle diameters of 10 μm or less are contained in water or an organic solvent in an amount of 1% by weight to 80% by weight. In addition, it is dispersed to a viscosity of 2 poise or less.

This electrode ink for electronic parts is prepared by adding 1 g of an additive or resin to 100 g of Pd powder having a particle size of 0.9 μm and 20 g of barium titanate powder having a particle size of 0.3 μm, and adding 150 g of an organic solvent or water. I do. Here, silver palladium, platinum, palladium, nickel or the like is added as the metal powder. The ceramic powder is a ceramic powder such as barium titanate, glass, alumina, or magnetic powder, and can be arbitrarily selected depending on the intended electronic component. As an additive, a phthalic acid-based solvent such as butyl phthalate or polyethylene oxide is added. By adding a cellulose-based resin, a vinyl-based resin, a petroleum-based resin, or the like as the resin, it is possible to improve the binding force of the printed coating film and to increase the strength of the dried ink. As the organic solvent, alcohols such as ethyl alcohol and isopropyl alcohol, ketones such as acetone and methyl ethyl ketone, esters such as butyl acetate, and hydrocarbons such as naphtha are added.

If necessary, fatty acid esters, polyhydric alcohol fatty acid esters, alkyl glycer ethers and their fatty acids, various lecithin derivatives, propylene glycol fatty acid esters, glycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyglycerin fatty acid esters, By adding sorbitan fatty acid ester, polyoxyethylene alkyl ether, or the like, the dispersibility of the powder becomes good, and precipitation due to reagglomeration of the powder can be prevented. In addition, the metal powder and the ceramic powder having different particle size distributions of 10 μm or less have different particle size distributions even when the metal powder and the ceramic powder have the same average particle size, that is, the ratio of finer powder is large. When the amount is small, the metal powder and the ceramic powder are more uniformly dispersed, so that precipitation is difficult. In addition, by uniformly dispersing the ceramic powder in the electrode ink, the sintering temperature of the electrode ink can be increased and the coefficient of thermal expansion of the electrode ink can be made closer to that of the ceramic material when manufacturing multilayer ceramic electronic components. It is possible to prevent defects such as delamination (delamination) from occurring, and to reduce the cost of the electrode ink.

Next, dispersion is performed for 3 hours using zirconia beads having a diameter of 0.5 mm. Thereafter, the solution is filtered using a membrane filter having a pore diameter of 5 μm to prepare an organic solvent-based electrode ink having a viscosity of 2 poise. Next, an electrode ink composed of a metal powder and a ceramic powder having a different particle size distribution of 10 μm or less is formed on a ceramic green sheet having a thickness of 10 μm prepared by the method described in Embodiment 1 by an ink jet method. 500 layers of the ceramic raw sheet on which the electrodes were printed were laminated. If necessary, a ceramic green sheet is pressed and pressed on the uppermost surface and the lowermost surface from above by a pressing device to form a ceramic green laminate.

Finally, the ceramic green laminate is cut into desired dimensions and cut into individual pieces, and then external electrodes are formed which are electrically connected to the ink patterns serving as internal electrodes, thereby forming a multilayer ceramic electronic component. It is.

For comparison, the cost of the multilayer ceramic electronic component made using the electrode ink without ceramic powder and the electrode ink with ceramic powder was compared.
By adding the ceramic powder, the cost was reduced by 10% or more in terms of the raw material cost, and the sintering yield was able to be increased.

(Embodiment 3) In the electrode ink for electronic parts according to Embodiment 3, a metal powder of 10 μm or less, together with a metal oxide, is contained in water or an organic solvent in an amount of 1% by weight or more.
% Or less and a viscosity of 2 poise or less.

This electrode ink for electronic parts is prepared by first preparing 100 g of Ni powder having a particle size of 0.5 μm and Ni powder having a particle size of 0.3 μm.
1 g of an additive or a resin is added to 20 g of the O powder, and 150 g of an organic solvent or water is added. Here, the metal powder is silver palladium, platinum, palladium, nickel, copper,
Zinc and the like, and the metal oxide is an oxide of such a metal, and can be arbitrarily selected depending on a target electronic component. As an additive, a phthalic acid-based solvent such as butyl phthalate or polyethylene oxide is added. By adding a cellulose-based resin, a vinyl-based resin, a petroleum-based resin, or the like as the resin, it is possible to improve the binding force of the printed coating film and to increase the strength of the dried ink.

As the organic solvent, alcohols such as ethyl alcohol and isopropyl alcohol, ketones such as acetone and methyl ethyl ketone, esters such as butyl acetate, and hydrocarbons such as naphtha are added. If necessary, fatty acid esters, polyhydric alcohol fatty acid esters, alkyl glycer ethers and their fatty acids, various lecithin derivatives, propylene glycol fatty acid esters, glycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters can be used as dispersants. By adding a polyoxyethylene alkyl ether or the like, the dispersibility of the powder becomes good, and precipitation due to reagglomeration of the powder can be prevented.

The metal powder and the metal oxide having a different particle size distribution of 10 μm or less are the metal powder and the oxide of the same metal element, and the metal oxide powder of the same metal element as the metal powder is more uniformly formed. Because they disperse, they are unlikely to precipitate. By uniformly dispersing the metal oxide powder in the electrode ink, the sintering temperature of the electrode ink can be increased and the coefficient of thermal expansion of the electrode ink can be made closer to that of the ceramic material when manufacturing multilayer ceramic electronic components. Therefore, the occurrence of defects such as delamination can be prevented, and the cost of the electrode ink can be reduced.

Next, dispersion is performed for 3 hours using zirconia beads having a diameter of 0.5 mm. Thereafter, the solution is filtered using a membrane filter having a pore diameter of 5 μm to prepare an organic solvent-based electrode ink having a viscosity of 2 poise. Next, an electrode ink composed of a metal powder and a metal oxide powder having a different particle size distribution of 10 μm or less was formed on a ceramic raw sheet having a thickness of 10 μm created by the method described in Embodiment 1 by an ink jet method, 500 layers of the ceramic raw sheet on which the internal electrodes were printed were laminated. If necessary, a ceramic green sheet is pressed and pressed on the uppermost surface and the lowermost surface from above by a pressing device to form a ceramic green laminate.

Finally, the ceramic green laminate is cut into desired dimensions and cut into individual pieces, and then external electrodes are formed which are electrically connected to the ink pattern as the internal electrodes, thereby forming a multilayer ceramic electronic component. It is.

For comparison, the cost of an electrode ink without a metal oxide and the cost of a multilayer ceramic electronic component made using an electrode ink with a metal oxide were compared. The cost could be reduced by 10% or more, and the sintering yield could be increased.

(Embodiment 4) The electrode ink for electronic parts according to Embodiment 4 has a metal powder of 10 μm or less together with an organometallic compound in water or an organic solvent in an amount of 1% by weight to 8% by weight.
It is a dispersion of 0% by weight or less and a viscosity of 2 poises or less.

First, 100 g of Ni powder having a particle size of 0.5 μm and 20 g of Ni citrate powder were prepared.
To 1 g, 1 g of an additive or resin is added, and 150 g of an organic solvent or water is added. Here, the metal powder is silver palladium, platinum, palladium, nickel, copper, zinc, or the like, and the metal oxide is an oxide of such a metal, and can be arbitrarily selected depending on a target electronic component. As the additive, a phthalic acid-based solvent such as butyl phthalate or polyethylene oxide is added. By adding a cellulose-based resin, a vinyl-based resin, a petroleum-based resin, or the like as the resin, it is possible to improve the binding force of the printed coating film and to increase the strength of the dried ink.

As the organic solvent, alcohols such as ethyl alcohol and isopropyl alcohol, ketones such as acetone and methyl ethyl ketone, esters such as butyl acetate, and hydrocarbons such as naphtha are added. If necessary, fatty acid esters, polyhydric alcohol fatty acid esters, alkyl glycer ethers and their fatty acids, various lecithin derivatives, propylene glycol fatty acid esters, glycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters can be used as dispersants. By adding a polyoxyethylene alkyl ether or the like, the dispersibility of the powder becomes good and the precipitation due to the reagglomeration of the powder can be prevented.

The metal powder and the metal oxide having different particle size distributions of 10 μm or less are the metal powder and the organometallic compound of the same metal element, and the organometallic compound of the same metal element as the metal powder is more uniformly formed. Dispersion or dispersion makes precipitation difficult. Further, since the adhesive strength between the electrode ink and the base material can be increased, it is possible to prevent the occurrence of defects such as delamination and to reduce the cost of the electrode ink.

Next, dispersion is performed for 3 hours using zirconia beads having a diameter of 0.5 mm. Thereafter, the solution is filtered using a membrane filter having a pore diameter of 5 μm to prepare an organic solvent-based electrode ink having a viscosity of 2 poise. Next, on a ceramic raw sheet having a thickness of 10 μm prepared by the method described in the first embodiment, a metal powder having a thickness of 10 μm or less forms an electrode ink composed of an organometallic compound by an ink jet method, and prints the internal electrodes. 5 ceramic raw sheets
00 layers were laminated. If necessary, a ceramic green sheet is pressed and pressed on the uppermost surface and the lowermost surface from above by a pressing device to form a ceramic green laminate.

Finally, this ceramic green laminate is cut into desired dimensions and cut into individual pieces, and then external electrodes are formed which are electrically connected to the ink pattern which is the internal electrode, thereby producing a multilayer ceramic electronic component. It is.

For comparison, the cost of the multilayer ceramic electronic component made using the electrode ink without the organometallic compound and the electrode ink containing the organometallic compound was compared. The cost could be reduced by 10% or more and the sintering yield could be increased.

(Embodiment 5) The electrode ink for electronic parts according to Embodiment 5 is obtained by mixing a metal powder of 10 μm or less having a ceramic material formed on its surface in water or an organic solvent.
It is dispersed in a range of not less than 80% by weight and not more than 80% by weight and a viscosity of 2 poise or less.

This electrode ink for electronic parts is prepared by first adding 100 g of Ni powder having a particle diameter of 0.5 μm having a ceramic material mainly composed of barium titanate formed on the surface, 1 g of an additive or resin, and adding an organic solvent or water. 150 g are added. Silver palladium, platinum, palladium, nickel,
A ceramic material is formed on a part (or the entire surface) of a metal powder surface of copper, zinc, or the like, and can be arbitrarily selected depending on a target electronic component. As the additive, a phthalic acid-based solvent such as butyl phthalate or polyethylene oxide is added. By adding a cellulose-based resin, a vinyl-based resin, a petroleum-based resin, or the like as the resin, it is possible to improve the binding force of the printed coating film and to increase the strength of the dried ink.

As the organic solvent, alcohols such as ethyl alcohol and isopropyl alcohol, ketones such as acetone and methyl ethyl ketone, esters such as butyl acetate, and hydrocarbons such as naphtha are added. If necessary, fatty acid esters, polyhydric alcohol fatty acid esters, alkyl glycer ethers and their fatty acids, various lecithin derivatives, propylene glycol fatty acid esters, glycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters can be used as dispersants. By adding a polyoxyethylene alkyl ether or the like, the dispersibility of the powder becomes good, and precipitation due to reagglomeration of the powder can be prevented.

The metal powder having a size of 10 μm or less having a ceramic material formed on the surface is a plating method on a metal surface such as silver palladium, platinum, palladium, nickel, copper, or zinc.
A ceramic material such as barium titanate is partially (or entirely) coated on the metal surface by a sol-gel method or vacuum evaporation method.
Since the ceramic material is adhered to the metal powder and dispersed or dispersed more uniformly, the electrode ink hardly precipitates. By uniformly dispersing the metal oxide powder in the electrode ink, the sintering temperature of the electrode ink can be increased and the coefficient of thermal expansion of the electrode ink can be made closer to that of the ceramic material when manufacturing multilayer ceramic electronic components. Therefore, the occurrence of defects such as delamination can be prevented, and the cost of the electrode ink can be reduced.

Next, dispersion is performed for 3 hours using zirconia beads having a diameter of 0.5 mm. Thereafter, the solution is filtered using a membrane filter having a pore diameter of 5 μm to prepare an organic solvent-based electrode ink having a viscosity of 2 poise. Next, on a ceramic raw sheet having a thickness of 10 μm formed by the method described in Embodiment 1, a ceramic material was formed on the surface thereof.
An electrode ink composed of a metal powder having a particle size of 0 μm or less was prepared by an ink jet method, and 500 layers of the ceramic raw sheet on which the internal electrodes were printed were laminated. If necessary, a ceramic green sheet is pressed and pressed on the uppermost surface and the lowermost surface from above by a pressing device to form a ceramic green laminate.

Finally, after cutting the ceramic green laminate to a desired size, external electrodes are formed to be electrically connected to the ink pattern, which is an internal electrode, to produce a multilayer ceramic electronic component.

For comparison, a comparison was made between the cost of an electrode ink having no ceramic material formed on its surface and the cost of a multilayer ceramic electronic component made using an electrode ink containing metal powder having a ceramic material formed on its surface. , By putting metal powder with ceramic material formed on the surface,
The raw material cost was reduced by 10% or more, and the sintering yield was able to be increased.

(Embodiment 6) In Embodiment 6, a method for producing an electrode ink for electronic parts will be described. First,
As a metal powder, 100 g of a silver powder having a particle size of 1 μm and 100 g of an organic solvent were added. In addition, 1 g of a dispersant and 2 g of a high boiling organic solvent as a plasticizer were added. Next, the dispersion was dispersed for one hour using zirconia beads having a diameter of 2 mmφ, and filtered to prepare an electrode ink having a viscosity of 0.1 poise. Next, a coil pattern was formed from the silver electrode ink by an ink jet method on the ferrite raw sheet, and five layers of the ferrite raw sheet on which the coil pattern was formed were laminated. Next, a capacitor pattern is formed on the dielectric glass sheet by using the silver electrode ink by an ink jet method.
The layers were laminated. Next, the ferrite raw sheet and the dielectric glass raw sheet are pressure-pressed with a diffusion preventing layer interposed therebetween to form a ceramic green laminate.

Lastly, after cutting the ceramic green laminate to a desired size, external electrodes electrically connected to the ink pattern as the internal electrodes are formed to produce a multilayer LC filter electronic component.

When producing an electrode ink for electronic parts using a bead mill, a diameter of 0.01 μmφ to 10 mm
It is desirable to use beads of φ or less. 0.005μ
With beads of m or less, it is difficult to remove the beads after dispersion. In the case of beads having a diameter of 15 mm or more, the dispersion efficiency is deteriorated and the metal powder may be deformed. When such beads are used, a commercially available motor-driven vertical or horizontal bead mill or a ball mill used by being set on a rotating frame or the like can be used. The rotation speed of such a mill is desirably from 10 rpm to 2,000 rpm. If the bead mill is at 5 rpm or less, the dispersion efficiency is reduced, which is not practical. In a high-speed bead mill exceeding 3000 rpm, collision between beads becomes severe, dispersing efficiency is reduced, bead life is shortened, and impurities easily enter the ink.

The adhesion to the alumina substrate or the like can be improved by adding glass powder to the electrode ink for electronic parts. Here, as the glass powder, Pb—SiO ₂ —B ₂ O
₃ can be added. Alternatively, bismuth oxide, copper oxide, aluminum oxide, titanium oxide, zinc oxide, magnesium oxide, manganese oxide, or the like may be added. An example of a method for manufacturing a square chip resistor using the silver electrode thus created will be described.

First, an upper electrode layer of this silver electrode is formed in the vicinity of the length and width of a sheet substrate, such as an alumina substrate, having split grooves in the length and width by an ink jet apparatus. Next, a resistor is formed so as to straddle the upper electrode layer. Finally, a protective layer is formed of glass or resin so as to cover the resistor. Finally, it is divided into individual pieces, and a plating layer is formed so as to cover the side electrodes as necessary, whereby a square chip resistor can be manufactured. Here, the resistor, glass, and resin may also be formed by ink jet.

(Embodiment 7) In Embodiment 7, a method for producing an electrode ink for electronic parts will be described. First,
As the metal powder, 100 g of a copper powder having a particle size of 1 μm and 100 g of an organic solvent were added. In addition, 1 g of a dispersant and 2 g of a high boiling organic solvent as a plasticizer were added. Next, after dispersing for 30 minutes in a commercially available automatic mortar, the pressure is 5 kg / cm ² or more and 300
The mixture was dispersed at a pressure of 0 kg / cm ² or less using a high-pressure dispersing apparatus having a jig made of a hard material, and then filtered to prepare an electrode ink having a viscosity of 0.1 poise.

Next, a coil pattern was formed from the silver electrode ink by an ink jet method on the ferrite raw sheet, and five layers of the ferrite raw sheet on which the coil pattern was formed were laminated. Then, a capacitor pattern was formed on the dielectric glass sheet by the ink jet method using the silver electrode ink, and five layers of the dielectric glass sheet having the capacitor pattern formed thereon were laminated. Next, the ferrite raw sheet and the dielectric glass raw sheet are sandwiched with a diffusion preventing layer in the middle, and pressed under pressure to form a ceramic green laminate.

Finally, after cutting this ceramic green laminate to a desired size, external electrodes electrically connected to the ink pattern, which is an internal electrode, are formed to produce a multilayer LC filter electronic component.

The method for producing the electrode ink for electronic parts will be described with reference to FIG. FIG. 6 is a diagram illustrating an example of the high-pressure dispersion device. In FIG. 6, 27 is a hopper, 28 is a pressure generating section, 29 is a dispersing section, 30 is a cooling section, and 31 is an ink discharge port. First, the ink (not shown in FIG. 6) supplied from the hopper 27 is sent to the dispersion unit 29.
A hydraulic pump or the like is built in the pressure generation unit 28, and the pressure generated in the pressure generation unit 28 is sent to the dispersion unit 29. The ink sent to the inside of the dispersion unit 29 is
After being dispersed under high pressure inside the cooling unit 30 and cooled in the cooling unit 30, the ink is discharged from the ink discharge port 31. The electrode ink for electronic parts can be more highly dispersed by passing through the high-pressure dispersing device a plurality of times as necessary. As such a high-pressure dispersing apparatus, commercially available products such as a homogenizer manufactured by Gorin, USA, a microfluidizer manufactured by Microfluidizer, Inc., an Ultimateizer manufactured by Sugino Machine Co., Ltd., and a Nanomizer manufactured by Japan Nanomizer Co., Ltd. can be used.

FIG. 7 shows an example of the inside of the dispersion section of the high-pressure dispersion device. Reference numeral 32 denotes a hard material, which can be made of ultra-high metal, ceramic, diamond, or the like to prevent abrasion. FIG. 7A shows a case where the ink is hit against a hard wall to be dispersed, and FIG. 7B shows a case where the ink ejected from a plurality of openings is hit and dispersed. In FIG. 7A, the electrode ink flows in the ink passage formed in the hard material 32 at a high speed in the direction of the arrow, and is struck and dispersed at a high speed in the hard material 32. In FIG. 7B, the electrode ink flows at high speed in the direction of the arrow inside the plurality of ink passages formed in the hard material 32, and the inks are struck at high speed, merged and dispersed. The inside of the dispersing portion may have a shape other than that shown in FIG. 7, but when producing an electrode ink for electronic parts used in an ink jet, the pressure is 5 kg / cm ² or more.
It is desirable that it be 000 kg / cm ² or less. When the pressure is less than 5 kg / cm ^2, the dispersion of the ink is insufficient, and the ink may precipitate or re-aggregate inside the ink jet device. When the pressure is 4000 kg / cm ² or more, the device becomes highly rigid, which increases the production cost and requires further safety measures.

(Embodiment 8) In Embodiment 8, a method for producing an electrode ink for electronic parts will be described. First,
As the electrode ink, 100 g of copper powder having a particle diameter of 1 μm and 100 g of an organic solvent were added as metal powder. Dispersant 1
g, and 2 g of a high-boiling organic solvent as a plasticizer. Next, the mixture was dispersed in a commercially available automatic mortar for 30 minutes. Next, this electrode ink was placed in a commercially available plastic bottle, set in an ultrasonic disperser, and ultrasonically dispersed.

The ultrasonic dispersion may be used not only in the production of electrode ink for electronic parts but also in the step of printing with an ink jet apparatus. For example, a commercially available ultrasonic water tank can be used as the thermostat 21 in FIG. By doing so, the ink tank 20 can always be ultrasonically dispersed as needed (it may be stirred using a stirrer or the like) at the same time, and furthermore, sedimentation and reaggregation of the ink can be prevented. In addition, by dispersing ultrasonic waves, it is possible to remove dissolved oxygen and the like dissolved in the electrode ink for electronic components, and to prevent the generation of bubbles in the electrode ink for electronic components. There is no.

When manufacturing an electrode ink for electronic parts, the ink can be dispersed in a shorter time by using an ultrasonic generator that inserts an ultrasonic oscillator directly into the ink. Also, when printing the completed electrode ink for electronic components using an ink jet device, the above-described ultrasonic generator with a water tank can be used to disperse ultrasonic waves from outside the ink tank. Etc. are not mixed. The ultrasonic dispersion time is 1 second or more and 1
0 hours or less is desirable. At less than 0.5 seconds, there is no effect of ultrasonic dispersion. Ultrasonic dispersion for more than 10 hours is not efficient and may shorten the life of the ultrasonic dispersion equipment.

Embodiment 9 In Embodiment 9, a method for producing an electrode ink for electronic parts will be described. First, as an electrode ink, a copper powder 1 having a particle diameter of 1 μm was used as a metal powder.
00 g and 100 g of an organic solvent were added. Dispersant 1
g, 2 g of a phthalic acid-based organic solvent was added as a plasticizer.
Next, the mixture was dispersed in a commercially available automatic mortar for 30 minutes. Next, this electrode ink was placed in a commercially available poly bottle, set in a high-speed dispersing device, and dispersed at high speed.

FIG. 8 shows an example of a rotary dispersion machine. In FIG. 8, the electrode ink 15 for electronic parts is set in a tank 33. 34 is a rotating device,
A jig 35 is attached to the tip. The jig 35 is rotated at a high speed in the direction of the arrow by a motor built in the rotating device 34 to disperse the electrode ink 15 for electronic components in the tank 33. Also, reference numeral 36 denotes the curvature of the bottom edge of the tank 33, and FIG.
As shown in FIG. Specifically, it is desirable to provide the bottom edge of the tank 33 with a curvature 36 having a diameter of 5 mm or more. The curvature 36 at the bottom edge of the tank 33 is 1
If it is less than mm, the convection of the ink in this portion may be hindered, resulting in insufficient dispersion, which is not desirable for dispersion of the electrode ink for electronic parts. Note that the rotation speed of the rotation device 34 is 600 r at the time of manufacturing the electrode ink for electronic parts.
Desirably, it is not less than pm and not more than 10,000 rpm. 500 rp
When the speed is lower than m, the dispersion of the ink may be insufficient. In addition, when high-speed dispersion at 10,000 rpm or more is performed, equipment is special and large-scale, and handling becomes difficult.

The rotary disperser may be used not only at the time of producing the electrode ink for electronic parts but also at the step of printing with an ink jet. For example, the tank 33 of FIG. 8 is used instead of the ink tank 20 of FIG. 4, and the electrode ink 15 for electronic components inside the ink tank 20 can be agitated by a jig 35 attached to the tip of a rotating device 34.
When the electronic component electrode ink 15 is stirred in such an ink jet printing process (because the ink is sufficiently dispersed and only for the purpose of preventing sedimentation and preventing re-aggregation), the rotation speed of the rotating device 34 should be 6 rpm or more and 600 rpm. The following is desirable. If it is less than 4 rpm, the prevention of ink precipitation may be insufficient. Also, if it exceeds 1000 rpm,
Since the ink has a low viscosity, bubbles are easily entrained.

In place of the automatic mortar, a commercially available disperser for high viscosity such as a kneader, a premixer or a planetary mixer may be used. By performing dispersion with such a dispersing machine, the dispersion can be performed with a smaller amount of solvent, so that the production cost of the ink can be reduced. Also, various materials and shapes are commercially available for the jig 35, and these can be selected according to the application.

(Embodiment 10) In Embodiment 10,
The cleaning of the ink jet device will be described. In particular, in the case of an electrode ink for electronic parts, since fine metal powder is added, even when an ink jet apparatus having an ink circulation mechanism as described in FIG. 4 is used, the first tube 22 and the second Metal powder may adhere and remain inside the tube 25, the suction mechanism 23, and the ink jet head 16. Such residues can reduce print quality. Therefore, it is desirable to wash the ink jet device as needed.

FIG. 9 shows a cleaning apparatus for an ink jet apparatus according to the present invention. In FIG. 9, 37a and 37b are switching valves, 38a and 38b are cleaning liquid tubes, and 39 is a cleaning liquid tank. First, in the case of normal printing of electrode ink for electronic parts, the electrode ink 15 for electronic parts put in the ink tank 20 is drawn in through the first tube 22,
Agglomerates are removed by the filter 24 and are ejected from the ink jet head 16 to the outside via the ink droplets 18. Then, the electronic component electrode ink 15 that has not been jetted by the ink jet head 16 is collected in the ink tank 20 via the second tube 25.

Next, a cleaning procedure in this apparatus according to the tenth embodiment will be described. First, the switching valves 37a and 37b are switched from the ink tank 20 to the cleaning liquid tank 39. In this way, the cleaning liquid inside the cleaning liquid tank 39 passes through the cleaning liquid tube 38a and passes through the filter 2 via the switching valve 37a.
4 to the ink jet head 16. Further, the vicinity of the ink ejection port of the ink jet head 16 is washed by ejecting the cleaning liquid from the ink jet head 16.

Next, the cleaning liquid not jetted by the ink jet head 16 is sent to the cleaning liquid tube 38b via the switching valve 37b and collected in the cleaning liquid tank 39 while cleaning the second tube 25.

In this way, the first tube 22, the second tube
By circulating the cleaning liquid through the tube 25, the ink jet head 16 and the inside of the tube can be cleaned.
Note that only the ink jet head 16 may be cleaned without flowing the cleaning liquid into the filter 24 by devising the mounting positions of the switching valves 37a and 37b. The entire amount of the cleaning liquid that has washed the ink jet head 16 can be jetted from the ink jet head 16 instead of being returned to the cleaning liquid tank 39 through the second tube 25. In this way, only the necessary parts can be selectively and automatically cleaned.

In the present invention, the same electronic component ink can be circulated from one ink tank to a plurality of electronic component printing ink jet devices. With this configuration, it is possible to absorb variations in the characteristics of electronic components among a plurality of ink jet devices for printing electronic components, and to efficiently use a small amount of ink.

In addition, air pressure or the like can be used for circulating the electrode ink for electronic parts other than the pump. In this case, it can be easily carried out by putting the ink into a pressurized tank, and then pressurizing it with air or nitrogen gas.

The electrode ink for electronic parts does not need to be constantly circulated. For example, it may be stopped as needed during printing with an ink jet. By doing so, the amount of ejected ink during printing is not affected by ink circulation. Even during printing, the ink can be circulated even for a short time such as a carriage return time in unidirectional printing and a head moving time in bidirectional printing. Further, the ink circulation amount (or ink flow rate) per unit time may be changed in the printing state. For example, the ink flow rate may be increased while printing is not being performed, such as when replacing a substrate or transporting a substrate, and may be decreased while performing high-precision printing.
In addition, by intentionally increasing the ink flow rate or increasing the ink transfer pressure, a large amount of the electrode ink for electronic parts can be ejected from the ink ejection portion in a potato or mist form without an external electric signal. Thus, the ink ejection portion can be cleaned.

(Embodiment 11) In Embodiment 11, an ink jet cleaning liquid used for printing on an electronic component will be described. For washing water-based electrode inks for electronic parts, a detergent in which 0.01 g or more and 200 g or less is added to 100 g of water is used. For washing electrode inks for organic solvent-based electronic parts, organic inks such as alcohol and butyl acetate are used. Solvent 100
g added with an organic detergent in an amount of 0.01 g or more and 200 g or less can be used. By adding the detergent in this way, even the powder component adhering to the inner wall or the like can be easily removed. After the washing liquid is flown, the remaining detergent components can be removed by circulating water or an organic solvent. In addition to the detergent, a dispersant, an additive, and the like used in the electrode ink for electronic components may be added in addition to the detergent. By adding the components used in the electrode ink for electronic parts in advance, problems hardly occur even if residual components remain. Further, when a metal salt is contained in the dispersant, it may remain inside the ink jet device. In such a case, it is desirable to select one containing no metal salt (for example, a polyoxyethylene-added nonionic surfactant or an ammonium salt type surfactant). EDTA and NT
By using a chelating agent such as A or a chelating resin, metal ions can also be removed.

[0127]

As described above, according to the present invention, it is possible to stably print with an ink jet even with a high-concentration electrode ink for electronic parts in which precipitates and aggregates are easily generated. Therefore, when not only multilayer ceramic electronic components such as multilayer ceramic capacitors but also electronic components such as high frequency components, optical components, LC filters, three-dimensional composite electronic components, and composite devices with various semiconductors are required. In addition to being able to manufacture in a short period of time, it is possible to reduce the cost, increase the yield, and increase the reliability of the product.

[Brief description of the drawings]

FIG. 1 is a view showing a state of precipitation of electrode ink for various electronic parts.

FIG. 2 is a diagram showing an example of measurement of sedimentation of ink for various electronic parts.

FIG. 3 is a diagram illustrating a method for manufacturing a multilayer ceramic electronic component according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating an ink jet apparatus according to Embodiment 1.

FIG. 5 is a diagram comparing printing stability between the ink jet device according to the first embodiment and a conventional ink jet device.

FIG. 6 is a diagram showing an example of a high-pressure dispersion device.

FIG. 7 is a diagram showing an example of the inside of a dispersion unit of the high-pressure dispersion device.

FIG. 8 is a diagram illustrating an example of a rotary dispersion machine.

FIG. 9 is a diagram showing an example of a cleaning device for an ink jet device according to the present invention.

FIG. 10 is a view showing a state in which an electrode ink is jetted on a conventional ceramic raw sheet by an ink jet.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 glass tube 11 electrode solution 12 supernatant layer 13 base film 14 ceramic raw sheet 15 electrode ink for electronic component 16 ink jet head 17 element 18 ink droplet 19 ink pattern 20 ink tank 21 constant temperature bath 22 first tube 23 suction mechanism 24 Filter 25 Second tube 26 Adjusting suction mechanism 27 Hopper 28 Pressure generating unit 29 Dispersing unit 30 Cooling unit 31 Ink outlet 32 Hard material 33 Tank 34 Rotating device 35 Jig 36 Curvature 37a, 37b Switching valve 38a, 38b Cleaning liquid tube 39 Cleaning liquid tank

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C11D 17/08 B41J 3/04 101Z F-term (Reference) 2C056 EA21 EA24 FA03 FA04 FA10 FA11 FB01 FB08 FC01 FC04 HA46 JC04 JC06 KA08 KB04 KB10 KB16 KB21 KB26 KD01 2H086 BA01 BA02 BA05 BA15 BA19 BA23 BA52 BA53 BA59 BA60 BA61 BA62 4H003 AC06 AE04 BA12 DA12 DA15 DB03 EB09 EB15 EB16 EB30 EB32 ED02 ED28 ED32 4J039 AB07 AD06 BA06

Claims (14)

[Claims] 1. A metal powder having a particle size of 10 μm or less is dispersed in water or an organic solvent at a concentration of 1% by weight to 80% by weight and a viscosity of 2 poises or less, and precipitation is 10 mm or less in 10 minutes or 20 mm or less in 100 minutes. Is an electrode ink for electronic parts. 2. A metal powder having a particle size of 10 μm or less and a particle size of 10 μm.
(c) An electrode ink for electronic parts in which ceramic powder is dispersed in water or an organic solvent in an amount of 1% by weight to 80% by weight and a viscosity of 2 poises or less. 3. An electrode ink for electronic parts comprising a metal powder having a particle size of 10 μm or less and a metal oxide dispersed in water or an organic solvent at a concentration of 1% by weight to 80% by weight and a viscosity of 2 poises or less. 4. A metal powder having a particle size of 10 μm or less is present in water or an organic solvent in an amount of 1% by weight to 80% by weight together with an organometallic compound.
An electrode ink for electronic parts having a viscosity of 2 poise or less. 5. The method according to claim 1, wherein the ceramic material is formed on the surface.
An electrode ink for electronic parts comprising a metal powder having a size of 1 μm or less dispersed in water or an organic solvent in a range of 1% by weight to 80% by weight and a viscosity of 2 poises or less. 6. Using a bead having a diameter of not less than 0.01 mm and not more than 10 mm, a metal powder is mixed with a ceramic powder or an organometallic compound or other additives in water or an organic solvent in an amount of from 1% by weight to 80% by weight and has a viscosity of 2% or less. A method for producing an electrode ink for electronic parts, which is dispersed below a poise and then filtered through a filter. 7. A pressure of 5 kg / cm ² or more and 3000 kg / cm ² or more.
After passing through a jig made of a hard material at a pressure of not more than ² cm in a state where the metal powder is mixed with water or an organic solvent at a weight of 1 wt% to 80 wt% and a viscosity of 2 poise or less, A method for producing an electrode ink for electronic components that is filtered by a filter. 8. In a state where the metal powder is mixed with water or an organic solvent in a range of 1% by weight to 80% by weight and a viscosity of 2 poise or less, together with a ceramic powder or an organic metal compound or other additives, for 1 second to 10 seconds. A method for producing an electrode ink for electronic parts, which is subjected to ultrasonic dispersion within a period of time or less and then filtered through a filter. 9. When the metal powder is mixed with water or an organic solvent in an amount of from 1% by weight to 80% by weight and a viscosity of 2 poise or less, together with a ceramic powder or an organic metal compound or other additives, and from 6 rpm to 10,000 rpm. The method for producing an electrode ink for electronic parts, wherein the dispersion is dispersed by a high-speed jig for 1 minute or more and then filtered. 10. An electrode ink for electronic parts having a viscosity of 2 poise or less in an ink tank is sent to an ink jet ejecting section via a first tube, and excess ink not ejected is discharged to a second tube. An ink jet device for printing electronic parts, comprising an ink circulation mechanism that is collected in the ink tank via the ink tank. 11. The electrode ink for electronic parts having a viscosity of 2 poise or less in an ink tank is filtered by a filter through a first tube, and then sent to an ink jet ejection unit.
An ink jet apparatus for printing an electronic component having an ink circulation mechanism in which the electrode ink for an electronic component that has not been ejected is collected in the ink tank through a second tube. 12. The cleaning liquid is sent to the ink jet ejecting unit via the first tube, and then, the electronic component printing ink jet device is washed, and the surplus liquid not jetted from the electronic component printing ink jet device. An ink jet apparatus for printing electronic parts having an ink washing mechanism in which a washing liquid is collected through a second tube. 13. An ink cleaning liquid containing 0.01 g or more and 200 g or less of a detergent, a dispersant, a chelating agent or a chelating resin with respect to 100 g of water or an organic solvent. 14. The electrode ink for electronic parts according to claim 1, which is formed into a predetermined pattern on a ceramic raw sheet or a ceramic substrate by using an ink jet apparatus, laminated or fired, and then singulated. A method for manufacturing electronic components to which external electrodes are attached.