WO2011065043A1 - Pâte pour protection électrostatique, composant de protection électrostatique et son procédé de production - Google Patents

Pâte pour protection électrostatique, composant de protection électrostatique et son procédé de production Download PDF

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Publication number
WO2011065043A1
WO2011065043A1 PCT/JP2010/059639 JP2010059639W WO2011065043A1 WO 2011065043 A1 WO2011065043 A1 WO 2011065043A1 JP 2010059639 W JP2010059639 W JP 2010059639W WO 2011065043 A1 WO2011065043 A1 WO 2011065043A1
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Prior art keywords
electrostatic protection
weight
parts
paste
protection component
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PCT/JP2010/059639
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English (en)
Japanese (ja)
Inventor
立樹 平野
孝宏 若狭
篤司 戸田
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釜屋電機株式会社
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Priority to CN201080053717.2A priority Critical patent/CN102741948B/zh
Priority to JP2011543123A priority patent/JP5439500B2/ja
Priority to KR1020127013499A priority patent/KR101415477B1/ko
Publication of WO2011065043A1 publication Critical patent/WO2011065043A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/102—Varistor boundary, e.g. surface layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors

Definitions

  • the present invention relates to an electrostatic protection paste, an electrostatic protection component, and a manufacturing method thereof.
  • electrostatic pulses generated when a terminal of an electronic device comes into contact with a charged human body, or external noise entering from an antenna of a portable information device Due to the overvoltage applied by the electronic device, there is a problem that an electronic circuit (electronic component) inside an electronic device such as a portable information device is destroyed, and the number of occurrences is increasing.
  • the electrostatic pulse and the external noise mean a voltage of several hundred to several kilovolts generated in a time of 1 nanosecond or less.
  • varistors In response to such demands, varistors generally have a problem that the capacitance increases because a structure in which ceramic films mainly composed of zinc oxide or the like are laminated is applied. Therefore, in order to reduce stray capacitance, it has already been proposed to use an antistatic component (static protection component) having a structure in which an electrostatic protection film is formed between electrodes facing each other through a narrow gap.
  • anti-static components electrostatic protection components
  • Patent Document 1 as a specific material for an electrostatic protection film applied in the structure of an anti-static component, aluminum in which a passivation layer (aluminum oxide) is formed on the surface to ensure high insulation is disclosed. The use of flour is disclosed.
  • Patent Document 2 as a material for an electrostatic protection film in an electrostatic protection element, a material which is composed mainly of zinc oxide (ZnO) and doped with a material made of manganese (Mn) or cobalt (Co) to become a semiconductor is disclosed.
  • Patent Document 3 Powder composition composed of bismuth (Bi), antimony (Sb), silicon (Si), calcium (Ca), barium (Ba), titanium (Ti) or aluminum (Al), or a minor component composed of these compounds It is disclosed to use a paste formed by mixing a powder such as a powder composition and glass frit.
  • Patent Document 3 as a material of an electrostatic absorber in an electrostatic protection element, zinc oxide (ZnO), a powder synthesized by mixing manganese (Mn) and cobalt (Co) for heat treatment and synthesizing the semiconductor, It is disclosed to use a material obtained by heat-mixing a carbide or oxide such as bismuth (Bi) or aluminum (Al) uniformly.
  • Patent Document 4 discloses forming a bank portion on an electrode in order to flatten the transient voltage protection film in a step of forming a transient voltage protection film by adhering and curing a transient voltage protection material on the electrode. Yes.
  • Patent Document 5 as an electrical overload protection material in an electrical overload protection device, an electrostatic protection material composed of an insulating binder, conductive particles, and semiconductor particles, an insulating binder, conductive particles, and semiconductor particles are insulated. Two types of materials are disclosed, which are roughly divided into electrostatic protection materials composed of conductive particles. Patent Document 5 describes that, from the viewpoint of particle size, the former electrostatic protection material has a maximum average particle size of conductive particles less than 10 ⁇ m and an average particle size of semiconductor particles less than 10 ⁇ m.
  • the conductive particles have a maximum average particle size of less than 10 ⁇ m
  • the semiconductor particles have an average particle size of less than 10 ⁇ m
  • the insulating particles have a range of about 200 angstroms to about 1000 angstroms.
  • Patent Document 6 discloses a structure in which a gap for separating a first electrode and a second electrode from each other is formed on an insulating substrate, a cavity is formed in the gap, and a voltage variable material is provided in the cavity.
  • An electrical circuit protection device is disclosed.
  • Patent Document 6 discloses the contents related to the thickness of the electrode.
  • a pair of first electrodes is formed in a thick state using a material having a small specific resistance on an insulating substrate, and a second thin film made of a refractory metal is used between the pair of electrodes.
  • An anti-static component having a structure in which a gap for providing an overvoltage protection material layer is formed in the second electrode is disclosed.
  • an overvoltage protection material layer is formed between a first ground electrode formed by printing and baking a gold resinate paste on an insulating substrate and a plurality of first upper surface electrodes, and the first ground is formed.
  • An antistatic component having a structure in which a second upper surface electrode covering an electrode and a second ground electrode covering the first ground electrode are formed by printing and baking a conductive paste mainly composed of silver is disclosed.
  • An electrostatic protection component having a structure in which an electrostatic protection film is formed between electrodes facing each other through the gap described above, forms at least two electrodes on a ceramic substrate such as alumina so as to face each other through the gap, and then An electrostatic protection film is formed by screen printing or the like so as to cover a part of the electrode and close the gap, and a protective film for protecting the electrostatic protection film from an external environment or the like It is formed so as to cover the entire electrostatic protection film. Further, a nickel plating film and a tin plating film are formed on the electrode portions not covered with the protective film by electroplating in order to improve the reliability as a terminal electrode.
  • the conventional materials for forming the electrostatic protection film in the above-mentioned electrostatic protection component are roughly classified into ceramic materials and materials obtained by kneading conductive particles, semiconductor particles, and insulating particles in a resin.
  • the electrostatic protection parts using ceramic materials as the material of the electrostatic protection film have a problem that the variation in capacitance is large.
  • the gap width (electrode spacing) varies greatly for each electrostatic protection component and the dielectric constant variation of the ceramic material is large. That is, assuming that the gap width (electrode spacing) is d, the dielectric constant of the electrostatic protection film is ⁇ , and the sectional area of the electrode is A, the electrostatic capacitance Cp of the electrostatic protection component can be expressed by ⁇ A / d.
  • the gap width d and the dielectric constant ⁇ vary greatly, the variation of the capacitance Cp also increases.
  • the temperature at which the ceramic material is heat-treated is 1000 ° C. to 1300 ° C. depending on the formation conditions, so that the heat treatment apparatus is large and expensive. There is also.
  • an object of the present invention is to provide an electrostatic protection paste that is inexpensive and can reduce variation in capacitance, an electrostatic protection component using the paste, and a method of manufacturing the same. To do.
  • the electrostatic protection paste of the first invention that solves the above problems is an electrostatic protection paste for forming an electrostatic protection film of an electrostatic protection component, It is a mixture of three components of silicone resin, conductive particles, and insulating particles.
  • the electrostatic protection paste of the second invention is characterized in that, in the electrostatic protection paste of the first invention, the conductive particles are aluminum powder and the insulating particles are zinc oxide powder.
  • the electrostatic protection paste of the third invention is the electrostatic protection paste of the second invention, wherein the silicone resin is 100 parts by weight, whereas the aluminum powder is 60 parts by weight to 200 parts by weight.
  • the zinc powder is 60 to 160 parts by weight.
  • an electrostatic protection component comprising: an insulating substrate; a surface electrode formed on the insulating substrate and facing the gap through a gap; and an electrostatic protection film formed in the gap and connected to the surface electrode
  • the electrostatic protection film is a mixture of three components of silicone resin, conductive particles, and insulating particles.
  • the electrostatic protection component of the fifth invention is the electrostatic protection component of the fourth invention.
  • the conductive particles are aluminum powder, and the insulating particles are zinc oxide powder.
  • the electrostatic protection component of the sixth invention is the electrostatic protection component of the fifth invention, wherein the silicone resin is 100 parts by weight, the aluminum powder is 60 to 200 parts by weight, and the zinc oxide powder is 60 to 160 parts by weight.
  • the manufacturing method of the electrostatic protection component of the seventh invention comprises a step of forming a surface electrode by applying and patterning an electrode paste on an insulating substrate by a screen printing method, Firing the surface electrode; Cutting the fired surface electrode to form a gap, and the surface electrode faces through the gap; and A step of forming an upper electrode by applying and patterning a conductive paste to each of the opposing front electrodes through the gap by a screen printing method; By applying a pattern for applying an electrostatic protection paste to the gap by screen printing, an electrostatic protection film is formed in the gap, and the electrostatic protection film is connected to the opposing surface electrode through the gap.
  • Process Baking the upper electrode and the electrostatic protection film simultaneously; It is characterized by having.
  • the manufacturing method of the electrostatic protection component of the eighth invention is the manufacturing method of the electrostatic protection component of the seventh invention.
  • the electrostatic protection paste is a mixture of three components of a silicone resin, conductive particles, and insulating particles.
  • the manufacturing method of the electrostatic protection component of the ninth invention is the manufacturing method of the electrostatic protection component of the eighth invention.
  • the conductive particles are aluminum powder, and the insulating particles are zinc oxide powder.
  • the manufacturing method of the electrostatic protection component of the tenth invention is the manufacturing method of the electrostatic protection component of the ninth invention, wherein the silicone resin is 100 parts by weight, the aluminum powder is 60 to 200 parts by weight, and the zinc oxide powder is 60 to 160 parts by weight.
  • the electrostatic protection paste of the first invention is an electrostatic protection paste for forming an electrostatic protection film of an electrostatic protection component, and comprises a silicone resin, conductive particles, , which is a mixture of three components of insulating particles, in which only two types of conductive particles and insulating particles are mixed in a silicone resin as a binder, and the conductive particles and the insulating particles Since no special surface treatment or the like is applied, an inexpensive antistatic paste can be realized. Therefore, an electrostatic protection component having an electrostatic protection film formed using this electrostatic protection paste is also inexpensive.
  • the electrostatic protection film using this electrostatic protection paste, the variation in the dielectric constant of the electrostatic protection film is reduced, so that the variation in the electrostatic capacitance of the electrostatic protection component having the electrostatic protection film is also reduced. . Therefore, when this electrostatic protection component is applied to an electronic device such as a portable information device as a countermeasure against electrostatic pulses or external noise, the stray capacitance and the variation regarding the electrostatic protection component can be reduced.
  • the conductive particles are aluminum powder
  • the insulating particles are zinc oxide powder.
  • an electrostatic protection paste can be manufactured at low cost.
  • the silicone resin is 100 parts by weight, whereas the aluminum powder is 60 parts by weight to 200 parts by weight, Since the zinc oxide powder is 60 parts by weight to 160 parts by weight, in addition to obtaining the effects of the first and second inventions, the electrostatic protection formed using the present electrostatic protection paste
  • an insulating substrate a surface electrode formed on the insulating substrate and facing each other through a gap, and static electricity formed in the gap and connected to the surface electrode
  • An electrostatic protection component having a protective film wherein the electrostatic protective film is a mixture of three components of silicone resin, conductive particles, and insulating particles.
  • An electrostatic protection film is formed of a material obtained by mixing only two kinds of conductive particles and insulating particles with silicone resin, and the conductive particles and insulating particles are not subjected to special surface treatment. Therefore, an electrostatic protection film can be formed at low cost, and an electrostatic protection component having this electrostatic protection film is also inexpensive.
  • the variation in the dielectric constant of the electrostatic protection film is reduced, the variation in the capacitance of the electrostatic protection component having the electrostatic protection film is also reduced. Therefore, when this electrostatic protection component is applied to an electronic device such as a portable information device as a countermeasure against electrostatic pulses or external noise, the stray capacitance and the variation regarding the electrostatic protection component can be reduced.
  • the conductive particles are aluminum powder, and the insulating particles are zinc oxide powder.
  • an electrostatic protection film can be formed at a low cost.
  • the silicone powder is 100 parts by weight, whereas the aluminum powder is 60 parts by weight to 200 parts by weight, Since the zinc powder is 60 parts by weight to 160 parts by weight, in addition to obtaining the effects of the fourth and fifth inventions, an electrostatic protection film formed using the present electrostatic protection paste is provided.
  • a step of forming a surface electrode by applying and patterning an electrode paste on an insulating substrate by a screen printing method A step of firing the surface electrode, a step of cutting the fired surface electrode to form a gap, and a structure in which the surface electrode is opposed to the gap through the gap, and a screen printing method, a conductive paste, Applying and patterning an electrostatic protection paste to the gap by a step of forming the upper electrode and screen printing by applying and patterning to each of the facing electrode facing through the gap Forming a static electricity protection film in the gap, connecting the static electricity protection film to a surface electrode facing the gap, and baking the upper electrode and the static electricity protection film at the same time.
  • the mechanical strength of the front electrode can be reinforced by the upper electrode, it is easy to form an electrostatic protection film by screen printing.
  • the upper electrode is screen-printed first and then the electrostatic protection film is screen-printed, the electrostatic protection film is screen-printed first, and then the upper electrodes 6a and 6b are screen-printed.
  • the number of times the screen mesh comes into contact with the membrane can be reduced. For this reason, it is possible to reduce the possibility that the electrical characteristics of the electrostatic protection film deteriorate due to the generation of static electricity that is larger than the desired static electricity resistance for the electrostatic protection film due to the charging of the screen mesh during screen printing.
  • the electrostatic protection paste comprises three components of silicone resin, conductive particles, and insulating particles.
  • silicone resin as the binder, only two types of conductive particles and insulating particles are mixed, and Since the conductive particles and insulating particles are not subjected to special surface treatment, an electrostatic protection film can be formed with an inexpensive electrostatic protection paste. It will be cheap.
  • the electrostatic protection film using this electrostatic protection paste, the variation in the dielectric constant of the electrostatic protection film is reduced, so that the variation in the electrostatic capacitance of the electrostatic protection component having the electrostatic protection film is also reduced. . Therefore, when this electrostatic protection component is applied to an electronic device such as a portable information device as a countermeasure against electrostatic pulses or external noise, the stray capacitance and the variation regarding the electrostatic protection component can be reduced.
  • the conductive particles are aluminum powder, and the insulating particles are zinc oxide powder. Therefore, in addition to obtaining the effects of the seventh and eighth inventions, an electrostatic protection film can be formed with an electrostatic protection paste using an inexpensive material such as the aluminum powder or zinc oxide powder.
  • the silicone resin is 100 parts by weight, whereas the aluminum powder is 60 parts by weight or more. Since 200 parts by weight and the zinc oxide powder is 60 parts by weight to 160 parts by weight, in addition to obtaining the effects of the seventh to ninth inventions, the present electrostatic protection paste is used.
  • FIG. 3 is a cross-sectional view (a cross-sectional view taken along line BB in FIG. 2) showing the structure of the electrostatic protection component according to the embodiment of the present invention. It is a top view (A direction arrow view of FIG. 1) which shows the structure of the electrostatic protection component which concerns on the example of embodiment of this invention. It is a flowchart which shows the manufacturing process of the electrostatic protection component which concerns on the embodiment of this invention. It is 1st explanatory drawing of the manufacturing process of the electrostatic protection component which concerns on the embodiment of this invention. It is 2nd explanatory drawing of the manufacturing process of the electrostatic protection component which concerns on the embodiment of this invention. It is 3rd explanatory drawing of the manufacturing process of the electrostatic protection component which concerns on the embodiment of this invention.
  • the binder silicone resin is 100 parts by weight
  • the aluminum powder is 160 parts by weight
  • the zinc oxide powder parts by weight (parameters) are 0 parts by weight, 40 parts by weight, 80 parts by weight, and 120 parts by weight. It is a graph which shows the insulation resistance deterioration number of the electrostatic protection component of.
  • the binder silicone resin is 100 parts by weight
  • the aluminum powder is 160 parts by weight
  • surface which shows the measurement result of the electrostatic capacitance of this electrostatic protection component. It is the table
  • the parts by weight (parameters) of the zinc oxide powder are 60 parts by weight, 80 parts by weight, 120 parts by weight, 160 parts by weight, and 200 parts by weight. Parameter) is 40 parts by weight, 60 parts by weight, 100 parts by weight, 150 parts by weight, 200 parts by weight, and 240 parts by weight. It is a table
  • surface which shows the result of having confirmed the leakage current of the ESD protection component formed by applying ESD, and the ESD suppression peak voltage. It is sectional drawing which shows the other structure of the electrostatic protection component which concerns on the example of embodiment of this invention.
  • the electrostatic protection component shown in FIGS. 1 and 2 is a surface mounting component for surface mounting on a printed circuit board, and an electronic circuit (electronic component) mounted on the printed circuit board is protected from an overvoltage caused by electrostatic pulses or external noise. For protection, it is provided between the line to which the overvoltage is applied and the ground.
  • front electrodes 2a and 2b are formed on the front surface 1a of the ceramic substrate 1 which is an insulating substrate, and back electrodes 3a and 3b are formed on the back surface 1b of the ceramic substrate 1. Yes.
  • the front electrodes 2a and 2b are formed over the entire length of the substrate surface 1a, while the back electrodes 3a and 3b are formed at both ends of the substrate back surface 1b.
  • a gap (narrow portion) 4 is formed in the central portion (between the surface electrodes 2a and 2b) of the substrate surface 1a. That is, the surface electrodes 2 a and 2 b are opposed to each other with the gap 4 interposed therebetween.
  • the gap 4 is formed by cutting the surface electrode film by a laser method or the like, and has a width d of about 10 ⁇ m (7 ⁇ m in this embodiment).
  • An electrostatic protection film 5 is formed in the gap 4, and the surface electrodes 2a and 2b and the electrostatic protection film 5 are connected. That is, the electrostatic protection film 5 is formed between the front electrodes 2a and 2b facing each other through the gap 4.
  • the electrostatic protection film 5 is not only formed in the gap 4 but also partially overlapped with the surface electrodes 2a and 2b. That is, the electrostatic protection film 5 has a central portion 5c provided in the gap 4 and both side portions 5a and 5b superimposed on the end portions 2a-1 and 2b-1 of the surface electrodes 2a and 2b, respectively. Note that the protective function against static electricity can be exhibited only by providing the electrostatic protection film 5 in the gap 4.
  • the electrostatic protection film 5 is formed of a material obtained by mixing two kinds of conductive particles and insulating particles in a silicone resin as a binder.
  • Conductive particles and insulating particles are not subjected to special treatment such as surface treatment such as providing a passive layer on the surface of conductive particles, or treatment such as doping other materials on the surface of insulating particles.
  • the conductive particles are aluminum (Al) powder that is conductive metal particles, and the insulating particles are zinc oxide (ZnO) powder.
  • ZnO zinc oxide
  • JIS standard type 1 zinc oxide that is, zinc oxide having a volume resistivity of 200 M ⁇ cm or more is used.
  • the mixing ratio of the three components of silicone resin, aluminum powder, and zinc oxide powder is, for example, 100 parts by weight of silicone resin, 60 to 200 parts by weight of aluminum powder, and 60 parts by weight of zinc oxide powder. Parts to 160 parts by weight.
  • the ESD suppression peak voltage is a voltage generated at the start of discharge. Moreover, the detail about the search of the said mixture ratio is mentioned later.
  • Upper electrodes 6a and 6b are formed on the surface electrodes 2a and 2b, respectively. Since the surface electrodes 2a and 2b are thin films, the mechanical strength is reinforced by forming the upper electrodes 6a and 6b on the surface electrodes 2a and 2b. However, the upper electrodes 6a and 6b are formed so as not to contact the electrostatic protection film 5 (at a position away from the electrostatic protection film 5). The reason is that when the upper electrodes 6a and 6b are in contact with the electrostatic protection film 5, when an overvoltage due to electrostatic pulses or the like is applied to the electrostatic protection component, not between the surface electrodes 2a and 2b but between the upper electrodes 6a and 6b. Or the upper electrodes 6a, 6b and the surface electrodes 2a, 2b may start to discharge, and in that case, the original electrostatic protection function of the electrostatic protection component cannot be exhibited. is there.
  • the electrostatic protection film 5 is covered with an intermediate layer 7, and the intermediate layer 7 is covered with a protective film 8. Further, both end portions 8a and 8b of the protective film 8 are overlapped with part of the upper electrodes 6a and 6b (portions on the gap side), respectively.
  • the protective film 8 is excellent in moisture resistance and the like, and is provided to protect the electrostatic protective film 5 and the like from the external environment such as humidity. However, since the protective film 8 has insufficient heat resistance, the electrostatic protective film 5 that generates heat during discharge is not directly covered with the protective film 8, and the intermediate protective layer 7 is excellent in heat resistance.
  • the intermediate layer 7 is covered and covered with a protective film 8.
  • End face electrodes 9a, 9b are formed on both end faces 1c, 1d of the ceramic substrate 1, and the front electrodes 2a, 2b and the back electrodes 3a, 3b are electrically connected by the end face electrodes 9a, 9b. Further, the end portions 9a-1, 9a-2, 9b-1, 9b-2 of the end face electrodes 9a, 9b are connected to the end portions 2a-2, 2b-2 of the front electrodes 2a, 2b and the back electrodes 3a, 3b. Since they are superimposed on the end portions 3a-1 and 3b-1, respectively, the connection between the end surface electrodes 9a and 9b and the front electrodes 2a and 2b and the back electrodes 3a and 3b is more reliable.
  • nickel (Ni) plating films 10a and 10b and tin (Sn) plating films 11a and 11b are formed in this order in order to improve the reliability of the terminal electrodes with respect to the end face electrodes 9a and 9b. ing.
  • the nickel plating films 10a and 10b cover the end face electrodes 9a and 9b, the back electrodes 3a and 3b, the front electrodes 2a and 2b, and the upper electrodes 6a and 6b, respectively, and the tin plating film 11a.
  • 11b cover the nickel plating films 10a and 10b, respectively.
  • FIG. 3 Each manufacturing process (step) in the flowchart of FIG. 3 is denoted by reference numerals S1 to S18. 4 (a) to (d), FIG. 5 (a) to (d), and FIG. 6 (a) to (c) sequentially show the manufacturing state of the electrostatic protection component in each manufacturing process. ing.
  • a 1005 type electrostatic protection component (having a width W of 0.5 mm and a length L of 1.0 mm shown in FIG. 2) was manufactured.
  • step S1 the ceramic substrate 1 is received in a manufacturing process (not shown) of the electrostatic protection component.
  • an alumina substrate was used as the ceramic substrate 1.
  • This alumina substrate is manufactured using 96% alumina as a ceramic material.
  • FIG. 4A shows only one ceramic substrate 1 in one piece area corresponding to one piece of electrostatic protection component, but the actual ceramic substrate 1 before being primarily divided in step S13. Is a sheet-like shape in which a plurality of primary slits and secondary slits are formed vertically and horizontally, and a plurality of individual regions are connected vertically and horizontally.
  • step S2 the back electrodes 3a and 3b are formed on the back surface 1b of the ceramic substrate 1 as shown in FIG.
  • the back electrodes 3a and 3b are formed by applying and patterning an electrode paste on the substrate back surface 1b by screen printing.
  • a silver (Ag) paste was used as the electrode paste.
  • the screen printed back electrodes 3a and 3b are dried to evaporate the solvent in the electrode paste.
  • a surface electrode 2 (a film for forming the surface electrodes 2a and 2b later) is formed on the surface 1a of the ceramic substrate 1.
  • the front electrode 2 is formed by applying an electrode paste to the substrate surface 1a and patterning it by screen printing.
  • a gold resinate paste was used as the electrode paste.
  • the screen-printed front electrode 2 is dried to evaporate the solvent in the electrode paste.
  • an electrode paste for forming the surface electrode 2 a resinate paste (metal organic paste) other than gold can be used.
  • a resinate paste of platinum (Pt) or silver (Ag) can be used.
  • a silver / palladium (Ag / Pd) paste may be used.
  • step S4 the back electrodes 3a and 3b formed in step S2 and the front electrode 2 formed in step S3 are simultaneously fired at 850 ° C. for 40 minutes.
  • step S5 the center portion of the surface electrode 2 baked in step S4 is cut by a laser method using a laser having a UV wavelength region (not shown).
  • a gap (narrow portion) 4 is formed.
  • a third harmonic laser (wavelength: 355 nm) was used as a laser having a UV wavelength region.
  • the width d of the gap 4 was 7 ⁇ m.
  • step S6 a conductive paste is applied to each of the surface electrodes 2a and 2b by a screen printing method to form a pattern.
  • Upper electrodes 6a and 6b are formed on 2b.
  • the number of screen printings at this time is one.
  • the upper electrodes 6a and 6b are formed so as to overlap the surface electrodes 2a and 2b at positions away from the electrostatic protection film 5 so as not to contact the electrostatic protection film 5.
  • the upper electrodes 6a and 6b after screen printing are dried to evaporate the solvent in the conductive paste.
  • the screen mesh used in this screen printing has a mesh size of 400 and an emulsion thickness of 82 ⁇ m (product number: st400).
  • the conductive paste a paste obtained by kneading silver powder and an epoxy resin was used.
  • the present invention is not limited thereto, and a thick film electrode paste obtained by kneading nickel (Ni), copper (Cu) powder, and the like and an epoxy resin may be used as the conductive paste for the upper electrode.
  • step S7 the electrostatic protection paste is applied to the gap 4 and the surface electrodes 2a and 2b by a screen printing method and patterned to thereby protect the static electricity.
  • a film 5 is formed.
  • the electrostatic protection film 5 is formed in the gap 4 and connected to the surface electrodes 2a and 2b (that is, interposed between the surface electrodes 2a and 2b), and is partially overlapped with the surface electrodes 2a and 2b.
  • the electrostatic protection film 5 after screen printing is dried at 100 ° C. for 10 minutes to evaporate the solvent in the electrostatic protection paste.
  • the screen mesh used in this screen printing is a calendar mesh, which has a mesh size of 400, a wire diameter of 18 ⁇ m, and an emulsion thickness of 52 ⁇ m (product number: cal400 / 18).
  • the paste for electrostatic protection used here has a silicone resin binder as a basic material, and this silicone resin is kneaded with two types of powders: aluminum powder used as conductive particles and zinc oxide powder used as insulating particles. It is what. Furthermore, the compounding ratio of these three components was 100 parts by weight of the silicone resin, 160 parts by weight of the aluminum powder, and 120 parts by weight of the zinc oxide powder.
  • silicone resin an addition reaction type silicone resin having a volume resistivity of 2 ⁇ 10 15 ⁇ cm and a dielectric constant of 2.7 was used.
  • aluminum powder aluminum powder having an average particle diameter of 3.0 to 3.6 ⁇ m obtained by melting aluminum, spraying at high pressure and solidifying by cooling was used.
  • zinc oxide powder zinc oxide having JIS standard type 1 insulation (volume resistivity of 200 M ⁇ cm or more) was used.
  • zinc oxide powder having a particle size distribution of 0.3 to 1.5 ⁇ m, an average particle size of 0.6 ⁇ m, and a primary aggregation particle size of 1.5 ⁇ m is applied to the zinc oxide powder. did.
  • step S8 the upper electrodes 6a and 6b formed in step S6 and the electrostatic protection film 5 formed in step S7 are simultaneously baked at 200 ° C. for 30 minutes.
  • step S9 a silicone resin paste is applied to the electrostatic protection film 5 and the surface electrodes 2a and 2b by a screen printing method and patterned.
  • An intermediate layer 7 that covers the protective film 5 and the like is formed.
  • the number of screen printings at this time is one.
  • a silicone resin paste containing 40 to 50% silica was used as the silicone resin paste.
  • the screen mesh used in this screen printing is a calendar mesh having a mesh size of 400, a wire diameter of 18 ⁇ m, and an emulsion thickness of 52 ⁇ m (product number: cal400 / 18).
  • step S10 the intermediate layer 7 formed in step S9 is baked at 150 ° C. for 30 minutes.
  • step S11 the epoxy resin paste is applied to the intermediate layer 7, the surface electrodes 2a and 2b, and the upper electrodes 6a and 6b by a screen printing method to form a pattern.
  • the protective film 8 that covers the intermediate layer 7 and the like is formed.
  • the number of screen printings at this time is two.
  • the screen mesh used in this screen printing has a mesh size of 400 and an emulsion thickness of 102 ⁇ m (product number: 3DSus400 / 19).
  • step S12 the protective film 8 formed in step S11 is baked at 200 ° C. for 30 minutes.
  • the ceramic substrate 1 is primarily divided along the primary slit formed in the sheet-like ceramic substrate 1.
  • the ceramic substrate 1 has a strip shape in which a plurality of individual regions are arranged in a horizontal line, and end faces 1c and 1d are generated.
  • step S14 the conductive paste is transferred to the end surfaces 1c and 1d of the ceramic substrate 1, a part of the front electrodes 2a and 2b, the back electrode 3a, by a transfer method. It is applied to a part of 3b and is baked at 200 ° C. for 30 minutes in the next step (step S15), thereby forming end face electrodes 9a and 9b. At this time, the end face electrodes 9a and 9b are partially overlapped with the front electrodes 2a and 2b and the back electrodes 3a and 3b, and electrically connect the front electrodes 2a and 2b to the back electrodes 3a and 3b.
  • a paste obtained by kneading silver powder and an epoxy resin was used as the conductive paste.
  • step S16 the ceramic substrate 1 is secondarily divided along the secondary slit formed in the belt-shaped ceramic substrate 1. As a result, the ceramic substrate 1 is divided into individual pieces to form individual pieces.
  • step S17 end face electrodes 9a and 9b, back electrodes 3a and 3b, part of front electrodes 2a and 2b, and upper electrode are formed by barrel plating. Electroplating is performed on part of 6a and 6b to form nickel plating films 10a and 10b.
  • step S18 the tin plating films 11a and 11b are electroplated on the nickel plating films 10a and 10b formed in step S17 by a barrel plating method. Form.
  • each ESD protection component (the manufacturing process is as above) which has each ESD protection film 5 formed using the paste for ESD protection from which the weight part of these aluminum powders differs, and performs ESD test, ESD suppression peak The voltage was measured.
  • each of the electrostatic protection components does not contain zinc oxide and increases the mixing amount of aluminum powder in the order of 95 parts by weight, 160 parts by weight, 200 parts by weight, and 250 parts by weight.
  • ESD suppression peak voltages of 550V, 450V, 400V, and 300V were shown, respectively. The number of times of voltage application at this time is one. From this test result, in order to satisfy the target value of ESD suppression peak voltage of 500 V or less, the mixing amount of aluminum powder of conductive metal particles having an average particle size of 3.0 ⁇ m was set to 160 parts by weight.
  • the ESD suppression peak voltage of the electrostatic protection component is lowered due to the insulation resistance deterioration of the electrostatic protection film 5, and the ESD tolerance of the electrostatic protection component is not good.
  • the ESD suppression peak voltage was 450 V.
  • the ESD suppression peak voltage is lower than 450V for the second and subsequent voltage application. Therefore, as a countermeasure against the ESD suppression peak voltage drop due to the deterioration of the insulation resistance, zinc oxide powder, which is insulating particles, was also mixed, and the weight part thereof was searched.
  • insulating particles having a volume resistivity of 200 M ⁇ cm or more are used as an average particle diameter.
  • mixed zinc oxide powder which is 1.5 micrometer 5 weight part, 15 weight part, 40 weight part, 60 weight part, 80 weight part, 100 weight part, 120 weight part was manufactured, respectively.
  • each ESD protection part manufactured using the paste for ESD protection from which the weight part of these zinc oxide powders is different, and performs ESD test, and ESD protection It was confirmed whether or not the insulation resistance of the film 5 deteriorated. Regardless of the weight part of zinc oxide powder, the number of tests of the electrostatic protection component is 30. In addition, this ESD test was implemented also about the case where the mixing amount of zinc oxide powder is 0 weight part.
  • FIG. 8 shows the test results when the amount of zinc oxide powder mixed is 0, 40, 80, and 120 parts by weight. As shown in FIG.
  • FIG. 9 shows test results when the amount of zinc oxide powder mixed is 0, 40, 80, and 120 parts by weight. Regardless of the weight part of the zinc oxide powder, the difference between the maximum value and the minimum value of the capacitance Cp is small, and the variation in the capacitance Cp is small.
  • the variation in the electrostatic capacitance Cp of the electrostatic protection component is small because the gap 4 is formed by cutting the thin-film surface electrode 2 by a laser method or the like, so that the cross-sectional areas A and gaps of the surface electrodes 2a and 2b
  • the variation in the dielectric constant ⁇ of the electrostatic protection film 5 formed using the above-mentioned electrostatic protection paste is also a factor.
  • FIGS. 10 and 11 show the static electricity of the electrostatic protection component of the present invention (an example of using an electrostatic protection paste of 100 parts by weight of silicone resin, 160 parts by weight of aluminum powder, and 120 parts by weight of zinc oxide powder).
  • a comparison between the capacitance Cp and the capacitance Cp of the comparative example (varistor) is shown. This comparison also shows that the electrostatic protection component of the present invention has a small variation in the capacitance Cp.
  • 100 parts by weight of the silicone resin as the binder with respect to 100 parts by weight of the zinc oxide powder is 60 parts by weight, 80 parts by weight, 120 parts by weight, 160 parts by weight, 200 parts by weight, and 40 parts by weight, 60 parts by weight, 100 parts by weight, 150 parts by weight, 200 parts by weight of aluminum powder.
  • the printability is a state when the electrostatic protection film 5 is screen-printed using the electrostatic protection paste of each blending ratio.
  • “XX” indicates that blurring occurs in the electrostatic protection film 5
  • “X” indicates that blurring occurs in the electrostatic protection film 5. In these cases, it is determined to be defective.
  • the leakage current and the ESD suppression peak voltage are as compared with each electrostatic protection component (manufacturing process is as described above) having each electrostatic protection film 5 formed using the electrostatic protection paste of each blending ratio. It is the result of conducting an ESD test and measuring the leakage current and the ESD suppression peak voltage.
  • “ ⁇ ” indicates a case where the number of electrostatic protection components that did not satisfy the target value of the leakage current of 10 ⁇ A or less was 2 or more out of 10. In this case, it is determined to be defective.
  • “ ⁇ ” indicates that the number of electrostatic protection components that did not meet the target value of 10 ⁇ A or less of the leakage current was 1 out of 10; This is a case where the number of parts is 0 out of 10.
  • “ ⁇ ” indicates a case where the number of electrostatic protection components that did not satisfy the target value of the ESD suppression peak voltage 400V to 500V was 2 or more out of 10. In this case, it is determined to be defective.
  • “ ⁇ ” indicates the target value of the ESD suppression peak voltage 400V to 500V when the number of electrostatic protection components that did not satisfy the target value of the ESD suppression peak voltage 400V to 500V was 1 in 10. This is the case where the number of electrostatic protection components that did not satisfy the above is 0 out of 10.
  • the blending ratio of the three components is 100 parts by weight of the silicone resin, 60 parts by weight to 200 parts by weight of the aluminum powder, and 60 parts by weight to 160 parts by weight of the zinc oxide powder. It turns out that the range is sufficient. More desirably, the mixing ratio of the three components is 100 parts by weight of the silicone resin, aluminum powder is in the range of 60 parts by weight to 200 parts by weight, and zinc oxide powder is in the range of 120 parts by weight to 160 parts by weight. It turns out that the range is sufficient. In addition, it has also been confirmed that the electrostatic protection parts to which these mixing ratios are applied have small variations in electrostatic capacity.
  • the electrostatic protection paste is formed by kneading only two kinds of conductive particles and insulating particles in a silicone resin as a binder. Since the conductive particles and the insulating particles are not specially treated, they are inexpensive. Therefore, the electrostatic protection component having the electrostatic protection film 5 formed using this electrostatic protection paste is also inexpensive. Moreover, since the variation in the dielectric constant ⁇ of the electrostatic protection film 5 is reduced by forming the electrostatic protection film 5 using this electrostatic protection paste, the electrostatic capacity Cp of the electrostatic protection component having the electrostatic protection film 5 is reduced. The variation of the is also reduced.
  • the conductive particles are aluminum powder
  • the insulating particles are zinc oxide powder. Since these aluminum powder and zinc oxide powder are inexpensive materials, an electrostatic protection paste can be manufactured at low cost. Can do.
  • the blending ratio of the three components of the electrostatic protection paste is such that the silicone resin is 100 parts by weight, the aluminum powder is 60 parts by weight to 200 parts by weight, and the zinc oxide powder is 60 parts by weight to 160 parts by weight.
  • the electrostatic protection component having the electrostatic protection film 5 formed using this electrostatic protection paste has an ESD suppression peak voltage of 500 V or less and an ESD resistance.
  • the screen-printed upper electrodes 6a and 6b and the electrostatic protection film 5 are simultaneously baked, so that the manufacturing process is simplified and the electrostatic protection component is manufactured at a low cost. can do.
  • the upper electrodes 6a and 6b are screen-printed first and then the electrostatic protection film 5 is screen-printed thereafter, the following effects can be obtained. That is, since the mechanical strength of the front electrodes 2a and 2b can be reinforced by the dried upper electrodes 6a and 6b, it is easy to form the electrostatic protection film 5 by screen printing. In addition, the number of times the screen mesh contacts the electrostatic protection film 5 can be reduced as compared with the case where the electrostatic protection film 5 is screen-printed first and then the upper electrodes 6a and 6b are screen-printed. To reduce the possibility that the electrical characteristics of the electrostatic protection film 5 will deteriorate due to the static electricity larger than the desired static electricity resistance of the electrostatic protection film 5 due to the charging of the screen mesh at the time. Can do.
  • the present invention can be applied not only to the electrostatic protection component having the structure as shown in FIG. 1 but also to various electrostatic protection components having an electrostatic protection film.
  • the electrostatic protection having the structure as shown in FIG. It can also be applied to parts.
  • glass films 12a and 12b are interposed between the sides 5a and 5b of the electrostatic protection film and the surface electrodes 2a and 2b, respectively.
  • electrostatic protection component in which one electrostatic protection film 5 is formed on one ceramic substrate 1 has been described.
  • the present invention is not limited to this. Two or more electrostatic protection components are provided on one ceramic substrate 1.
  • the electrostatic protection component formed with the electrostatic protection film 5 is also within the scope of the present invention.
  • the present invention relates to a paste for an electrostatic protection film, an electrostatic protection component, and a manufacturing method thereof, and is useful when applied to an electrostatic protection component for protecting electronic devices such as portable information devices from electrostatic pulses and external noise. is there.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Thermistors And Varistors (AREA)
  • Laminated Bodies (AREA)
  • Conductive Materials (AREA)
  • Elimination Of Static Electricity (AREA)

Abstract

L'invention porte sur : une pâte pour protection électrostatique, qui peut être obtenue à un faible coût et qui permet de supprimer des variations de capacité ; un composant de protection électrostatique qui utilise la pâte pour protection électrostatique ; et un procédé de production du composant de protection électrostatique. De façon spécifique, l'invention porte sur une pâte pour protection électrostatique, qui est utilisée dans le but de former un film de protection électrostatique. La pâte pour protection électrostatique est obtenue par malaxage de seulement deux sortes de particules, à savoir des particules conductrices et des particules isolantes, dans une résine de silicone qui sert de liant. Les particules conductrices et les particules isolantes ne sont pas soumises à un traitement spécial. Les particules conductrices sont composées d'une poudre d'aluminium et les particules isolantes sont composées d'une poudre d'oxyde de zinc. Pour 100 parties en poids de la résine de silicone, la poudre d'aluminium est contenue à hauteur de 60-200 parties en poids et la poudre d'oxyde de zinc est contenue à hauteur de 60-160 parties en poids. Lorsqu'un composant de protection électrostatique est produit, une électrode supérieure est d'abord formée par sérigraphie, puis un film de protection électrostatique est formé par sérigraphie. A cet égard, l'électrode supérieure et le film de protection électrostatique formés par sérigraphie sont cuits en même temps.
PCT/JP2010/059639 2009-11-26 2010-06-08 Pâte pour protection électrostatique, composant de protection électrostatique et son procédé de production WO2011065043A1 (fr)

Priority Applications (3)

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CN201080053717.2A CN102741948B (zh) 2009-11-26 2010-06-08 静电保护用浆料、静电保护部件及其制造方法
JP2011543123A JP5439500B2 (ja) 2009-11-26 2010-06-08 静電気保護用ペースト、静電気保護部品及びその製造方法
KR1020127013499A KR101415477B1 (ko) 2009-11-26 2010-06-08 정전기 보호용 페이스트, 정전기 보호 부품 및 그 제조 방법

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JP5221794B1 (ja) * 2012-08-09 2013-06-26 立山科学工業株式会社 静電気保護素子とその製造方法
CN103918144A (zh) * 2011-09-28 2014-07-09 釜屋电机株式会社 静电保护元件及其制造方法
JP2016025086A (ja) * 2014-07-16 2016-02-08 サムソン エレクトロ−メカニックス カンパニーリミテッド． 静電気保護用ペースト及びその製造方法
JP2016143884A (ja) * 2015-01-29 2016-08-08 サムソン エレクトロ−メカニックス カンパニーリミテッド． 静電気保護素子用ペースト及びその製造方法

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KR102445531B1 (ko) * 2015-10-21 2022-09-21 쑤저우 레킨 세미컨덕터 컴퍼니 리미티드 발광 소자
KR102218896B1 (ko) * 2015-11-16 2021-02-24 삼성전기주식회사 정전기 방전 보호용 조성물 및 이 조성물을 이용한 정전기 방전 보호 소자
CN108878082B (zh) * 2018-06-13 2020-10-23 南京萨特科技发展有限公司 一种超低电容静电抑制器及其制备方法
CN113613481B (zh) * 2021-08-06 2023-10-13 苏州晶讯科技股份有限公司 一种低触发、低容值片式静电抑制器的制备方法
CN114394576A (zh) * 2022-01-24 2022-04-26 深圳市科尔诺电子科技有限公司 双极冷却可组合板式臭氧发生器
CN117393253A (zh) 2022-07-04 2024-01-12 国巨电子（中国）有限公司 抗浪涌电阻器及其制造方法

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JP5221794B1 (ja) * 2012-08-09 2013-06-26 立山科学工業株式会社 静電気保護素子とその製造方法
JP2016025086A (ja) * 2014-07-16 2016-02-08 サムソン エレクトロ−メカニックス カンパニーリミテッド． 静電気保護用ペースト及びその製造方法
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JPWO2011065043A1 (ja) 2013-04-11
CN102741948A (zh) 2012-10-17
TWI509641B (zh) 2015-11-21
TW201118891A (en) 2011-06-01
KR101415477B1 (ko) 2014-07-04
CN102741948B (zh) 2016-05-25
JP5439500B2 (ja) 2014-03-12

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