EP0034511A2 - Spannungsabhängiger keramischer Widerstand mit niedriger Schwellenspannung und Verfahren zu dessen Herstellung - Google Patents

Spannungsabhängiger keramischer Widerstand mit niedriger Schwellenspannung und Verfahren zu dessen Herstellung Download PDF

Info

Publication number
EP0034511A2
EP0034511A2 EP81400054A EP81400054A EP0034511A2 EP 0034511 A2 EP0034511 A2 EP 0034511A2 EP 81400054 A EP81400054 A EP 81400054A EP 81400054 A EP81400054 A EP 81400054A EP 0034511 A2 EP0034511 A2 EP 0034511A2
Authority
EP
European Patent Office
Prior art keywords
electrodes
ceramic
resistor according
threshold voltage
teeth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81400054A
Other languages
English (en)
French (fr)
Other versions
EP0034511A3 (de
Inventor
Annick Romann
François Buchy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
L.C.C.-C.I.C.E. - COMPAGNIE EUROPEENNE DE COMPOSAN
Original Assignee
Lcc-Cice - Europeenne De Composants Electroniques Cie
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lcc-Cice - Europeenne De Composants Electroniques Cie filed Critical Lcc-Cice - Europeenne De Composants Electroniques Cie
Publication of EP0034511A2 publication Critical patent/EP0034511A2/de
Publication of EP0034511A3 publication Critical patent/EP0034511A3/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
    • H01C1/142—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors the terminals or tapping points being coated on the resistive element

Definitions

  • the invention relates to ceramic type resistors, called varistors, which have a non-linear characteristic of the current as a function of the voltage applied to their terminals. Its purpose is to obtain resistors exhibiting exponential growth from a low value threshold voltage, for example from 5 to 10 volts.
  • the coefficient a is greater than 50.
  • the threshold voltage can vary from 5 to 50 volts depending on various factors.
  • V is the sum of potential drops, of the order of 2 to 3 volts, existing in the different intergranular barriers that are encountered when going from one electrode to another in the ceramic body. varistor.
  • the drop in potential by intergranular barrier is practically constant for a given ceramic composition throughout the structure of the varistor. It follows that, if we are dealing with a structure with regular particle size, that is to say having a size deviating little from an average size, for example from 15 to 25 microns for an average grain of 20 microns in diameter, the threshold voltage could be adjusted by choosing the thickness of the disc in the case of varistors made in this form.
  • the invention tends to eliminate all or part of these drawbacks.
  • the resistance according to the invention is of the ceramic type with non-linear current-voltage characteristic, of predetermined threshold voltage, characterized in that it is produced in the form of a plate made of ceramic material comprising at least two electrodes located on the same face of the wafer and the mean distance of which is determined so that there exists between the electrodes, in the surface layer of the wafer, a predetermined number of crystallites.
  • two electrodes in the form of combs are deposited, the teeth or fingers of which are "interdigitated". This is done by depositing a protective mask using a photolithography technique using a photosensitive resin. This operation is followed, in the simplest case, by the metallization of the unprotected parts, by vacuum evaporation of aluminum, nickel, silver or zinc or by spray metallization or another conventional method.
  • a simpler method consists in placing the electrodes by screen printing, a process whose resolution could sometimes prove to be insufficient.
  • the parts to be metallized are deeply etched so that the teeth of the comb have a thickness of the same order of magnitude as their width in contact with the ceramic material.
  • FIG. 1 The plan view of FIG. 1 applies as well to the case of the variant which has just been indicated as to the more general case of a simple metallization.
  • On a wafer 1 there are two electrodes 11 and 12 in the form of combs whose teeth are interposed over all or part of their length.
  • the teeth 111 and 121 have for example a width of 50 to 100 microns and the spacing of two teeth belonging to different combs is of the same order of magnitude.
  • each comb has an enlarged region (112, 122) to allow connection by welding to the use connections of the non-linear resistor thus formed.
  • FIG. 2 shows a section, along a trace plane AA in Figure 1, of the ceramic plate, in the case of metallizations implanted in trenches of depth equal to their width.
  • Figure 7 there is shown, similar to that of Figure 1, a resistor constituted by a ceramic plate 1 having arrays of teeth 111 and 121, organized in interdigitated combs, but whose directions are oblique: between two teeth of each comb there is an angle of a few degrees. This angle could be more or less pronounced, from a few degrees to twenty or thirty degrees, or even more. We see that the distance between two neighboring teeth is variable when we move parallel to one or the other of these teeth.
  • the characteristic I (V) of such a varistor presents a much more rounded angle and a much less strong growth, as if there existed for the tension a threshold zone instead of a precise value and a lower coefficient. Such a curve may be suitable for certain applications, in particular in telephony.
  • FIG. 8 there are two combs of the "variable pitch" type 81 and 82, the successive spacings between neighboring teeth progressively increasing from one terminal (83) of the varistor to the other (84).
  • the vitreous composition contains 10 to 40% by weight of bismuth oxide, boron and / or lead and, in addition, 1 with 10% of zinc oxide itself added with Al 2 O 3 or Ti 0 2 in a proposal of 10 to 40% of additive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
EP81400054A 1980-02-12 1981-01-16 Spannungsabhängiger keramischer Widerstand mit niedriger Schwellenspannung und Verfahren zu dessen Herstellung Withdrawn EP0034511A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8003044 1980-02-12
FR8003044A FR2475791A1 (fr) 1980-02-12 1980-02-12 Resistance ceramique non lineaire a faible tension de seuil, et son procede de fabrication

Publications (2)

Publication Number Publication Date
EP0034511A2 true EP0034511A2 (de) 1981-08-26
EP0034511A3 EP0034511A3 (de) 1981-09-09

Family

ID=9238482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400054A Withdrawn EP0034511A3 (de) 1980-02-12 1981-01-16 Spannungsabhängiger keramischer Widerstand mit niedriger Schwellenspannung und Verfahren zu dessen Herstellung

Country Status (4)

Country Link
EP (1) EP0034511A3 (de)
JP (1) JPS56125807A (de)
BR (1) BR8100814A (de)
FR (1) FR2475791A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2513032A1 (fr) * 1981-09-14 1983-03-18 Carreras Michelle Dispositif de protection integre contre les surtensions d'un circuit electronique, et circuit electronique protege par ce dispositif

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2726941A1 (fr) * 1986-01-28 1996-05-15 Cimsa Cintra Dispositif integre de protection par varistance d'un composant electronique contre les effets d'un champ electro-magnetique ou de charges statiques
JP4953055B2 (ja) * 2006-04-28 2012-06-13 大日本印刷株式会社 プラスチック製容器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1491465A (fr) * 1966-06-28 1967-08-11 Lorraine Carbone Procédé de fabrication de résistances superficielles
FR2146453A1 (de) * 1971-07-22 1973-03-02 Gen Electric
DE2528090A1 (de) * 1974-07-01 1976-01-22 Gen Electric Polykristalliner varistor mit vielen anschluessen
FR2286804A1 (fr) * 1974-10-01 1976-04-30 Thomson Csf Materiau et procede de fabrication de pieces en ceramique pour varistances

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1491465A (fr) * 1966-06-28 1967-08-11 Lorraine Carbone Procédé de fabrication de résistances superficielles
FR2146453A1 (de) * 1971-07-22 1973-03-02 Gen Electric
DE2528090A1 (de) * 1974-07-01 1976-01-22 Gen Electric Polykristalliner varistor mit vielen anschluessen
FR2286804A1 (fr) * 1974-10-01 1976-04-30 Thomson Csf Materiau et procede de fabrication de pieces en ceramique pour varistances

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JOURNAL OF APPLIED PHYSICS, Vol. 51, No 1, Janvier 1980 New York, US F.A. SELIM et al.: "Low voltage ZnO varistor: Device process and defect model", pages 765-768 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2513032A1 (fr) * 1981-09-14 1983-03-18 Carreras Michelle Dispositif de protection integre contre les surtensions d'un circuit electronique, et circuit electronique protege par ce dispositif

Also Published As

Publication number Publication date
EP0034511A3 (de) 1981-09-09
JPS56125807A (en) 1981-10-02
FR2475791B1 (de) 1983-05-13
FR2475791A1 (fr) 1981-08-14
BR8100814A (pt) 1981-08-25

Similar Documents

Publication Publication Date Title
EP0424254B1 (de) Elektrischer Widerstand in Chip-Bauweise für Oberflächenbestückung und Verfahren zu seiner Herstellung
EP0148687B1 (de) Photoempfindliche Vorrichtung mit strahlungsundurchlässigen Zonen zwischen den Detektoren und Herstellungsverfahren
US5330630A (en) Switch with improved threshold voltage
FR2493022A1 (fr) Cellule programmable perfectionnee pour reseaux electroniques programmables
CN101060161A (zh) 具有真空侧壁子的相变存储单元
EP1801897A1 (de) Verbessertes Verfahren zur Herstellung von Speicherzellen vom Typ PMC
EP0222668A1 (de) Verfahren zum Herstellen eines Dünnschichttransistors mit in Bezug auf Source und Drain selbstausrichtendem Gate durch stufenweises Ätzen und danach hergestellter Transistor
EP0234994A1 (de) Anzeige-Bildschirm mit aktiver Matrix sowie mit Drain-Widerstand und Verfahren zur Herstellung dieses Bildschirms
EP0043775A1 (de) Kapazitiver Fühler und Verfahren zu seiner Herstellung
CH678378A5 (de)
FR2843488A1 (fr) Dispositif de commutation pour un capteur a rayons x
DE8232492U1 (de) Solarzelle aus amorphem Silizium
EP0200599A1 (de) Verfahren zur Herstellung von nichtlinearen Steuerelementen für elektrooptische Anzeigeschirmplatte und eine nach diesem Verfahren hergestellte Schirmplatte
FR2566186A1 (fr) Procede de fabrication d'au moins un transistor a effet de champ en couche mince et transistor obtenu par ce procede
EP0202150B1 (de) Nichtlineares Steuerelement für elektrooptische Anzeigeschirmplatte und Verfahren zu dessen Herstellung
EP0034511A2 (de) Spannungsabhängiger keramischer Widerstand mit niedriger Schwellenspannung und Verfahren zu dessen Herstellung
FR2560818A1 (fr) Substrats flexibles isolants comportant deux couches de verre sur au moins l'une de leurs faces, et procede de fabrication de tels substrats
EP0160601B1 (de) Kleiner Präzisionswiderstand für hohe Spannungen aus Dickschicht-Technologie
FR2570223A1 (fr) Dispositif piezoelectrique et procede de realisation d'un tel dispositif
EP0074312B1 (de) Verfahren zur Herstellung eines Dickschichtvaristors auf einem Hybridschaltungssubstrat und der auf diese Weise erzeugte Varistor
FR2654247A1 (fr) Procede de fabrication de varistances a l'oxyde de zinc haute tension.
EP0093633B1 (de) Substrat für elektronische Schaltung und Verfahren zur Herstellung dieses Substrats
JPS63502712A (ja) 可変抵抗体のための改良サーメット抵抗素子
WO1983001153A1 (en) Integrated protection device against overvoltages in an electronic circuit and electronic circuit protected by such device
FR2523993A1 (fr) Pate serigraphiable a oxydes metalliques et produit obtenu avec cette pate

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): DE GB IT NL

AK Designated contracting states

Designated state(s): DE GB IT NL

17P Request for examination filed

Effective date: 19811012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: L.C.C.-C.I.C.E. - COMPAGNIE EUROPEENNE DE COMPOSAN

18D Application deemed to be withdrawn

Effective date: 19830210

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BUCHY, FRANCOIS

Inventor name: ROMANN, ANNICK