WO2003009311A1 - Electroceramic component - Google Patents
Electroceramic component Download PDFInfo
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- WO2003009311A1 WO2003009311A1 PCT/DE2002/001938 DE0201938W WO03009311A1 WO 2003009311 A1 WO2003009311 A1 WO 2003009311A1 DE 0201938 W DE0201938 W DE 0201938W WO 03009311 A1 WO03009311 A1 WO 03009311A1
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- ceramic material
- electrical component
- ceramic
- component according
- base body
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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
- H01C7/105—Varistor cores
-
- 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
- H01C7/18—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 comprising a plurality of layers stacked between terminals
Definitions
- the present invention relates to an electro-ceramic component with a low capacitance and at least two contact layers provided on the surface of a ceramic base body.
- Components of the type mentioned initially include e.g. Varistors.
- the basic body of such known components is often made from a mixture of different metal oxides, for example based on zinc oxide.
- Varistors have a non-linear voltage-dependent change in resistance that is used to protect an electrical circuit from overvoltage. The resistance value of varistors decreases with increasing voltage.
- multi-layer varistors have not been used for overvoltage protection of high-frequency circuits, such as high-frequency input circuits for antenna inputs. This is due to the fact that the laminar structure of the multilayer varistors and the grain boundary effect of the varistor ceramic cause the capacitors to be too high. The result of this is that the high-frequency signal is generally disadvantageously attenuated by the high capacitance of the varistor.
- the object of the present invention is to provide an electro-ceramic component which avoids the disadvantages mentioned.
- the invention describes an electrical component with a base body, consisting of at least a first and a second ceramic material and at least two contact surfaces applied to the surface of the base body.
- the capacitance of the component is reduced in that the second ceramic material has a lower dielectric constant than the first ceramic material.
- the second ceramic material primarily serves to reduce the capacitance of the entire electrical component, while the first ceramic material, apart from the capacitance, defines the electrical properties of the component.
- the second ceramic material should be arranged at least partially between the contact layers, but need not necessarily contact them.
- the electrical component according to the invention can be used, for example, as a varistor.
- the first ceramic is a varistor ceramic, for example based on zinc oxide.
- at least some regions of the first ceramic material advantageously contact both contact layers and define a current path between these contact layers.
- the base body of which is made up of only a single ceramic material, consist in the fact that the second material enables a sometimes considerable reduction in capacitance without impairing the varistor properties of the component. This enables the use of the varistors according to the invention in highly sensitive high-frequency circuits.
- the second material is advantageously a ceramic based on spinels with the general formula AB2O4, where A is divalent metals and B is trivalent or tetravalent metals, for example ZnMn2Ü4.
- the A and B positions can advantageously be filled with the elements magnesium, manganese, selenium, cobalt, nickel, zinc, aluminum or iron.
- the zinc manganese spinel for example, has a dielectric constant in the range of approximately 10 to 20 and is therefore considerably below the dielectric constant of the varistor material (approximately 400 to 800). It is also possible to use phase mixtures, for example based on zinc oxide and bismuth oxide as the second ceramic material.
- sintering aids such as bismuth oxide or a glass melting at a suitable temperature can be added to the second material.
- first and second ceramic materials can be sintered together, so that the manufacture of the electrical component is greatly simplified.
- Figure 1 shows a conventional varistor.
- FIG. 2 shows a varistor according to the invention with two ceramic materials.
- FIG. 3 shows a varistor according to the invention with two ceramic materials, the second ceramic material not contacting the contact layers.
- FIG. 4 shows a varistor according to the invention, which is constructed from alternating layers of the first and the second ceramic material lying one above the other.
- FIG. 5 shows a varistor according to the invention with internal electrodes which intermesh like a comb.
- FIG. 6 shows a varistor according to the invention with internal electrodes which are at a distance from one another.
- FIG. 2 shows a varistor according to the invention, the base body of which consists of regions 1 of a first ceramic material and regions 5 of a second ceramic material.
- the two contacting layers 10 and 15 contact the two ceramic materials.
- part of the varistor base body is therefore replaced by a second ceramic which has a lower dielectric constant. Since the capacity-reducing influence of the second ceramic material on the varistor is also possible if the second ceramic material does not contact the contact surfaces 10 and 15, an embodiment shown in FIG. 3 is also possible.
- the second ceramic material is on the first ceramic material, the varistor ceramic, applied without contacting the contact layers.
- a construction from alternating layers of the first and second ceramic material lying one above the other is also possible, as shown in FIG.
- multilayer varistors can also be realized with inner electrodes 25, in which each inner electrode only contacts one contact layer 10 or 15, so that electrode stacks 30, 35 are formed, which are each connected to only one contact layer.
- These electrodes are advantageously only arranged in the first ceramic material, the varistor ceramic, and not in the second ceramic material.
- FIG. 6 shows an alternative embodiment in which the inner electrodes do not intermesh like a comb, but in which comb-like electrode stacks face each other at a distance, the area 40 between the electrode stacks 30, 35 consisting of the ceramic material 1.
- the varistor voltage was approximately 370 V.
- the first ceramic material used for both varistor types was a varistor ceramic based on zinc oxide, while ZnMn2 ⁇ 4 was additionally used as the second material for the varistor according to the invention.
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- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
Abstract
Description
Beschreibungdescription
Elektrokeramisches BauelementElectro ceramic component
Die vorliegende Erfindung betrifft ein elektrokeramisches Bauelement mit niedriger Kapazität und wenigstens zwei auf der Oberfläche eines keramischen Grundkörpers vorgesehenen Kontaktschichten .The present invention relates to an electro-ceramic component with a low capacitance and at least two contact layers provided on the surface of a ceramic base body.
Zu Bauelementen der eingangs genannten Art gehören z.B. Varistoren. Der Grundkörper solcher bekannter Bauelemente ist häufig aus einer Mischung verschiedener Metalloxide, zum Beispiel auf der Basis von Zinkoxid, hergestellt. Varistoren weisen eine nicht-lineare spannungsabhängige Widerstandsände- rung auf, die zum Schutz eines elektrischen Schaltkreises vor Überspannung benutzt wird. Der Widerstandswert von Varistoren sinkt dabei mit steigender anliegender Spannung.Components of the type mentioned initially include e.g. Varistors. The basic body of such known components is often made from a mixture of different metal oxides, for example based on zinc oxide. Varistors have a non-linear voltage-dependent change in resistance that is used to protect an electrical circuit from overvoltage. The resistance value of varistors decreases with increasing voltage.
Dennoch werden Vielschichtvaristoren bisher nicht zum Über- spannungsschütz von Hochfrequenzschaltungen, wie beispielsweise hochf equente Eingangsschaltungen bei Antenneneingängen, eingesetzt. Dies ist darauf zurückzuführen, daß der laminare Aufbau der Vielschichtvaristoren und der Korngrenzeneffekt der Varistorkeramik eine zu hohe Kapazität der Va- ristoren bedingen. Dies hat zur Folge, daß in der Regel das hochfrequente Signal durch die hohe Kapazität des Varistors nachteiligerweise gedämpft wird.However, multi-layer varistors have not been used for overvoltage protection of high-frequency circuits, such as high-frequency input circuits for antenna inputs. This is due to the fact that the laminar structure of the multilayer varistors and the grain boundary effect of the varistor ceramic cause the capacitors to be too high. The result of this is that the high-frequency signal is generally disadvantageously attenuated by the high capacitance of the varistor.
Aus der Druckschrift DE 199 31 056 AI ist bekannt, die Kapa- zität von Varistoren dadurch zu senken, daß im Varistorgrundkörper mehrere Schichten von nicht überlappenden Innenelektroden angeordnet werden. Die Elektroden kontaktieren jeweils nur eine KontaktSchicht so, daß sie einen gewissen Abstand zu den anderen Elektroden aufweisen, die mit der zweiten Kon- taktschicht verbunden sind, und mit diesen nicht überlappen. Offenbart wird auch die Möglichkeit, eine elektrisch isolierende Passivschicht auf den Varistorgrundkörper aufzubringen, um die Kapazität zu senken. Der Nachteil dieser Methode besteht darin, daß der kapazitätssteigernde Effekt des Varistorgrundkörpers nach wie vor vorhanden ist. So weist beispielsweise eine auf Zinkoxid basierende Varistorkeramik eine Dielektrizitätskonstante im Bereich von 400 bis 800 auf. Deshalb lassen sich mit diesem Verfahren nur Varistoren realisieren, die eine Kapazität im Bereich von etwa 1,5 bis 10 pF aufweisen. Für den Überspannungsschutz von Hochfrequenzschaltungen werden häufig jedoch Varistoren mit einer niedrigeren Kapazität gesucht.From document DE 199 31 056 AI it is known to reduce the capacitance of varistors by arranging several layers of non-overlapping internal electrodes in the varistor base. The electrodes contact only one contact layer in such a way that they are at a certain distance from the other electrodes which are connected to the second contact layer and do not overlap them. The possibility is also disclosed of applying an electrically insulating passive layer to the varistor base body, to reduce capacity. The disadvantage of this method is that the capacitance-increasing effect of the base body of the varistor is still present. For example, a varistor ceramic based on zinc oxide has a dielectric constant in the range from 400 to 800. Therefore, this method can only be used to implement varistors that have a capacitance in the range of approximately 1.5 to 10 pF. However, varistors with a lower capacitance are often sought for the overvoltage protection of high-frequency circuits.
Aufgabe der vorliegenden Erfindung ist es, ein elektrokeramisches Bauelement anzugeben, das die genannten Nachteile vermeidet .The object of the present invention is to provide an electro-ceramic component which avoids the disadvantages mentioned.
Diese Aufgabe wird erfindungsgemäß durch ein elektrisches Bauelement nach Anspruch 1 gelöst . Vorteilhafte Ausgestaltungen des Bauelements sind Gegenstand weiterer Ansprüche.This object is achieved according to the invention by an electrical component according to claim 1. Advantageous configurations of the component are the subject of further claims.
Die Erfindung beschreibt ein elektrisches Bauelement mit einem Grundkörper, bestehend aus zumindest einem ersten und einem zweiten Keramikmaterial und wenigstens zwei auf der Oberfläche des Grundkörpers aufgebrachten Kontaktflächen. Die Kapazität des Bauelements wird dadurch erniedrigt, daß das zweite Keramikmaterial eine niedrigere Dielektrizitätskonstante als das erste Keramikmaterial aufweist. Das zweite Keramikmaterial dient in erster Linie dazu, die Kapazität des gesamten elektrischen Bauelements zu senken, während das erste Keramikmaterial, abgesehen von der Kapazität, die elek- trischen Eigenschaften des Bauelements definiert. Um einen kapazitätssenkenden Einfluß auf das gesamte Bauelement ausüben zu können, sollte das zweite Keramikmaterial zumindest teilweise zwischen den Kontaktschichten angeordnet sein, muß diese aber nicht notwendigerweise kontaktieren.The invention describes an electrical component with a base body, consisting of at least a first and a second ceramic material and at least two contact surfaces applied to the surface of the base body. The capacitance of the component is reduced in that the second ceramic material has a lower dielectric constant than the first ceramic material. The second ceramic material primarily serves to reduce the capacitance of the entire electrical component, while the first ceramic material, apart from the capacitance, defines the electrical properties of the component. In order to be able to exert a capacity-reducing influence on the entire component, the second ceramic material should be arranged at least partially between the contact layers, but need not necessarily contact them.
Das erfindungsgemäße elektrische Bauelement kann beispielsweise als Varistor eingesetzt werden. In diesem Falle umfaßt die erste Keramik eine Varistorkeramik, beispielsweise auf der Basis von Zinkoxid. Um die elektrischen Eigenschaften des Bauelements zum definieren, kontaktieren vorteilhafterweise zumindest einige Bereiche des ersten Keramikmaterials beide Kontaktschichten und definieren einen Strompfad zwischen diesen Kontaktschichten.The electrical component according to the invention can be used, for example, as a varistor. In this case includes the first ceramic is a varistor ceramic, for example based on zinc oxide. In order to define the electrical properties of the component, at least some regions of the first ceramic material advantageously contact both contact layers and define a current path between these contact layers.
Die Vorteile der Erfindung gegenüber herkömmlichen Varistoren, deren Grundkörper nur aus einem einzigen Keramikmaterial aufgebaut ist, bestehen darin, daß durch das zweite Material eine zum Teil erhebliche Erniedrigung der Kapazität ermöglicht wird, ohne die Varistoreigenschaften des Bauelements zu beeinträchtigen. Dadurch wird der Einsatz der erfindungsgemäßen Varistoren in hochsensiblen Hochfrequenzschaltungen erst ermöglicht.The advantages of the invention compared to conventional varistors, the base body of which is made up of only a single ceramic material, consist in the fact that the second material enables a sometimes considerable reduction in capacitance without impairing the varistor properties of the component. This enables the use of the varistors according to the invention in highly sensitive high-frequency circuits.
Das zweite Material ist vorteilhafterweise eine Keramik auf der Basis von Spinellen mit der allgemeinen Formel AB2O4, wobei A zweiwertige Metalle und B drei- oder vierwertige Metal- le darstellt, beispielsweise ZnMn2Ü4. Die A- und B-Plätze können dabei vorteilhafterweise mit den Elementen Magnesium, Mangan, Selen, Kobalt, Nickel, Zink, Aluminium oder Eisen besetzt sein. Der Zinkmanganspinell beispielsweise weist eine Dielektrizitätskonstante im Bereich von etwa 10 bis 20 auf und liegt damit erheblich unterhalb der Dielektrizitätskonstante des Varistormaterials (in etwa 400 bis 800) . Möglich ist auch der Einsatz von Phasengemischen, beispielsweise auf der Basis von Zinkoxid und Wismutoxid als zweites Keramikmaterial. Gegebenenfalls können dem zweiten Material Sinter- hilfsmittel, wie beispielsweise Wismutoxid oder ein bei geeigneter Temperatur schmelzendes Glas zugesetzt werden. Die Vorteile der genannten Materialien bestehen auch darin, daß das erste und zweite Keramikmaterial zusammen sinterbar sind, so daß die Herstellung des elektrischen Bauelements stark vereinfacht wird. Im folgenden soll die Erfindung sowie einige ihrer Ausgestaltungen anhand von Figuren und einem Ausführungsbeispiel näher erläutert werden.The second material is advantageously a ceramic based on spinels with the general formula AB2O4, where A is divalent metals and B is trivalent or tetravalent metals, for example ZnMn2Ü4. The A and B positions can advantageously be filled with the elements magnesium, manganese, selenium, cobalt, nickel, zinc, aluminum or iron. The zinc manganese spinel, for example, has a dielectric constant in the range of approximately 10 to 20 and is therefore considerably below the dielectric constant of the varistor material (approximately 400 to 800). It is also possible to use phase mixtures, for example based on zinc oxide and bismuth oxide as the second ceramic material. Optionally, sintering aids such as bismuth oxide or a glass melting at a suitable temperature can be added to the second material. The advantages of the materials mentioned are also that the first and second ceramic materials can be sintered together, so that the manufacture of the electrical component is greatly simplified. In the following, the invention and some of its configurations will be explained in more detail with reference to figures and an exemplary embodiment.
Figur 1 zeigt einen herkömmlichen Varistor.Figure 1 shows a conventional varistor.
Figur 2 zeigt einen erfindungsgemäßen Varistor mit zwei Ke- ramikmaterialien.FIG. 2 shows a varistor according to the invention with two ceramic materials.
Figur 3 zeigt einen erfindungsgemäßen Varistor mit zwei Keramikmaterialien, wobei das zweite Keramikmaterial nicht die Kontaktschichten kontaktiert.FIG. 3 shows a varistor according to the invention with two ceramic materials, the second ceramic material not contacting the contact layers.
Figur 4 zeigt einen erfindungsgemäßen Varistor, der aus al- ternierenden übereinanderliegenden Lagen des ersten und des zweiten Keramikmaterials aufgebaut ist.FIG. 4 shows a varistor according to the invention, which is constructed from alternating layers of the first and the second ceramic material lying one above the other.
Figur 5 zeigt einen erfindungsgemäßen Varistor mit Innenelektroden, die kammartig ineinander greifen.FIG. 5 shows a varistor according to the invention with internal electrodes which intermesh like a comb.
Figur 6 zeigt einen erfindungsgemäßen Varistor mit Innenelektroden, die sich mit einem Abstand gegenüber stehen.FIG. 6 shows a varistor according to the invention with internal electrodes which are at a distance from one another.
In Figur 2 ist ein erfindungsgemäßer Varistor zu sehen, dessen Grundkörper aus Bereichen 1 eines ersten Keramikmaterials und Bereichen 5 eines zweiten Keramikmaterials besteht. Die beiden Kontaktierungsschichten 10 und 15 kontaktieren in diesem Fall die beiden Keramikmaterialien. Im Vergleich zum Stand der Technik (Figur 1) ist also ein Teil des Varistorgrundkörpers durch eine zweite Keramik ersetzt, die eine niedrigere Dielektrizitätskonstante aufweist. Da der kapazi- tätssenkende Einfluß des zweiten Keramikmaterials auf den Varistor auch möglich ist, wenn das zweite Keramikmaterial nicht die Kontaktflächen 10 und 15 kontaktiert, ist auch eine in Fig. 3 gezeigte Ausführung möglich. Dabei ist das zweite Keramikmaterial auf dem ersten Keramikmaterial, der Varistor- keramik, aufgebracht, ohne die Kontaktschichten zu kontaktieren.FIG. 2 shows a varistor according to the invention, the base body of which consists of regions 1 of a first ceramic material and regions 5 of a second ceramic material. In this case, the two contacting layers 10 and 15 contact the two ceramic materials. In comparison to the prior art (FIG. 1), part of the varistor base body is therefore replaced by a second ceramic which has a lower dielectric constant. Since the capacity-reducing influence of the second ceramic material on the varistor is also possible if the second ceramic material does not contact the contact surfaces 10 and 15, an embodiment shown in FIG. 3 is also possible. The second ceramic material is on the first ceramic material, the varistor ceramic, applied without contacting the contact layers.
Möglich ist auch ein Aufbau aus alternierenden übereinander- liegenden Schichten des ersten und zweiten Keramikmaterials wie in Figur 4 gezeigt.A construction from alternating layers of the first and second ceramic material lying one above the other is also possible, as shown in FIG.
In einer alternativen Ausführungsform des Bauelements lassen sich auch Vielschichtvaristoren mit Innenelektroden 25 reali- sieren, bei denen jede Innenelektrode jeweils nur eine Kontaktschicht 10 oder 15 kontaktiert, so daß Elektrodenstapel 30, 35 gebildet werden, die jeweils nur mit einer Kontaktsschicht verbunden sind. Vorteilhafterweise werden diese Elektroden nur im ersten Keramikmaterial, der Varistorkeramik an- geordnet und nicht im zweiten Keramikmaterial .In an alternative embodiment of the component, multilayer varistors can also be realized with inner electrodes 25, in which each inner electrode only contacts one contact layer 10 or 15, so that electrode stacks 30, 35 are formed, which are each connected to only one contact layer. These electrodes are advantageously only arranged in the first ceramic material, the varistor ceramic, and not in the second ceramic material.
Figur 6 zeigt eine alternative Ausführungsform, bei der die Innenelektroden nicht kammartig ineinander greifen, sondern bei der sich kammartige Elektrodenstapel in einem Abstand ge- genüberstehen, wobei der Bereich 40 zwischen den Elektrodenstapeln 30,35 aus dem Keramikmaterial 1 besteht.FIG. 6 shows an alternative embodiment in which the inner electrodes do not intermesh like a comb, but in which comb-like electrode stacks face each other at a distance, the area 40 between the electrode stacks 30, 35 consisting of the ceramic material 1.
Vergleichende Kapazitätsmessungen zwischen einem erfindungsgemäßen, nach Figur 6 aufgebauten Varistor und einem herkömm- liehen Varistor mit Innenelektroden, bei dem der Grundkörper nur aus einem Material aufgebaut ist, ergaben, daß bei etwa 1 MHz die Kapazität eines erfindungsgemäßen Varistors etwa 0,3 pF beträgt im Vergleich zu einer Kapazität von 1,5 pF bei herkömmlichen Varistoren. Die Varistorspannung betrug zirka 370 V. Als erstes Keramikmaterial wurde dabei für beide Varistortypen eine Varistorkeramik auf der Basis von Zinkoxid verwendet, während für den erfindungsmäßigen Varistor zusätzlich als zweites Material ZnMn2θ4 eingesetzt wurde.Comparative capacitance measurements between a varistor according to the invention, constructed according to FIG. 6, and a conventional varistor with internal electrodes, in which the base body is constructed from only one material, showed that at approximately 1 MHz the capacitance of a varistor according to the invention is approximately 0.3 pF im Compared to a capacitance of 1.5 pF with conventional varistors. The varistor voltage was approximately 370 V. The first ceramic material used for both varistor types was a varistor ceramic based on zinc oxide, while ZnMn2θ 4 was additionally used as the second material for the varistor according to the invention.
Mit Hilfe von erfindungsgemäßen Varistoren lassen sich niedrige Kapazitäten von etwa 0,1 pF erreichen. In Versuchen zeigte sich, daß bis zu 2/3 des Varistorgrundkörpers aus dem zweiten Keramikmaterial hergestellt werden können, ohne die Varistoreigenschaften des Bauelements nachteilig zu beeinflussen.With the help of varistors according to the invention, low capacitances of approximately 0.1 pF can be achieved. Experiments have shown that up to 2/3 of the base body of the varistor comes from the second ceramic material can be produced without adversely affecting the varistor properties of the component.
Die Erfindung ist nicht auf die konkret beschriebenen Ausführungsbeispiele beschränkt. Im Rahmen der Erfindung liegen selbstverständlich auch weitere Variationen, insbesondere bezüglich der Bauform des elektrischen Bauelements, der Anzahl und Anordnung der verwendeten Keramikmaterialien sowie der Art und Eigenschaften des zweiten keramischen Materials. The invention is not restricted to the specifically described exemplary embodiments. Of course, there are further variations within the scope of the invention, in particular with regard to the design of the electrical component, the number and arrangement of the ceramic materials used, and the type and properties of the second ceramic material.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10134751.0 | 2001-07-17 | ||
| DE2001134751 DE10134751C1 (en) | 2001-07-17 | 2001-07-17 | Electrical component used as a varistor has a base body with regions of ceramic material and contact layers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003009311A1 true WO2003009311A1 (en) | 2003-01-30 |
Family
ID=7692104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2002/001938 Ceased WO2003009311A1 (en) | 2001-07-17 | 2002-05-27 | Electroceramic component |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE10134751C1 (en) |
| TW (1) | TW564439B (en) |
| WO (1) | WO2003009311A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7167352B2 (en) * | 2004-06-10 | 2007-01-23 | Tdk Corporation | Multilayer chip varistor |
| DE102004045009B4 (en) * | 2004-09-16 | 2008-03-27 | Epcos Ag | Electrical component and its use |
| DE102005028498B4 (en) * | 2005-06-20 | 2015-01-22 | Epcos Ag | Electrical multilayer component |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5073302A (en) * | 1988-02-18 | 1991-12-17 | Somar Corporation | Varistor material and process for production therefor |
| US5115221A (en) * | 1990-03-16 | 1992-05-19 | Ecco Limited | Varistor structures |
| US5976420A (en) * | 1997-02-17 | 1999-11-02 | Murata Manufacturing Co., Ltd. | Chip type varistor and ceramic compositions for the same |
| US6087923A (en) * | 1997-03-20 | 2000-07-11 | Ceratech Corporation | Low capacitance chip varistor and fabrication method thereof |
| DE19931056A1 (en) * | 1999-07-06 | 2001-01-25 | Epcos Ag | Low capacitance multilayer varistor |
-
2001
- 2001-07-17 DE DE2001134751 patent/DE10134751C1/en not_active Expired - Lifetime
-
2002
- 2002-05-27 WO PCT/DE2002/001938 patent/WO2003009311A1/en not_active Ceased
- 2002-06-27 TW TW91114138A patent/TW564439B/en active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5073302A (en) * | 1988-02-18 | 1991-12-17 | Somar Corporation | Varistor material and process for production therefor |
| US5115221A (en) * | 1990-03-16 | 1992-05-19 | Ecco Limited | Varistor structures |
| US5976420A (en) * | 1997-02-17 | 1999-11-02 | Murata Manufacturing Co., Ltd. | Chip type varistor and ceramic compositions for the same |
| US6087923A (en) * | 1997-03-20 | 2000-07-11 | Ceratech Corporation | Low capacitance chip varistor and fabrication method thereof |
| DE19931056A1 (en) * | 1999-07-06 | 2001-01-25 | Epcos Ag | Low capacitance multilayer varistor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10134751C1 (en) | 2002-10-10 |
| TW564439B (en) | 2003-12-01 |
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