US3735318A - Fusing resistor - Google Patents

Fusing resistor Download PDF

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Publication number
US3735318A
US3735318A US00195689A US3735318DA US3735318A US 3735318 A US3735318 A US 3735318A US 00195689 A US00195689 A US 00195689A US 3735318D A US3735318D A US 3735318DA US 3735318 A US3735318 A US 3735318A
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US
United States
Prior art keywords
resistor
film
tin oxide
layer
resistive
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.)
Expired - Lifetime
Application number
US00195689A
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English (en)
Inventor
J Bucklin
J Utken
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.)
Duracell Inc USA
Emerson Electric Co
Original Assignee
PR Mallory and Co Inc
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 PR Mallory and Co Inc filed Critical PR Mallory and Co Inc
Application granted granted Critical
Publication of US3735318A publication Critical patent/US3735318A/en
Anticipated expiration legal-status Critical
Assigned to EMERSON ELECTRIC CO. A CORP. OF MISSOURI reassignment EMERSON ELECTRIC CO. A CORP. OF MISSOURI ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EMHART INDUSTRIES, INC. A CORP. OF CONNECTICUT
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/046—Fuses formed as printed circuits

Definitions

  • ABSTRACT A layer of material is disposed over at least a portion [52] US. Cl. ..337/296, 337/160, 338/300 of a resistive film of a resistor the material having a [51] Int. Cl. ..H01h 85/04 melting point lower than the l i point of the [58] Field Of Search ..337/l60, 163, 296, i tiv film and when melted, chemically reacts with the resistive film to render at least a portion of the film non-conductive.
  • This invention relates to resistors and, more particularly, to thin film resistors.
  • the present invention therefore, relates to thin film resistors and has as one of its objects the provision of a thin film resistor which may be open circuited when subjected to severe overloads.
  • Another object of the invention is the provision of a thin film resistor having a layer of a material disposed on at least a portion of the resistive film which under severe overload conditions will render a portion thereof non-conductive.
  • a further object of the invention is the provision of a tin oxide film resistor which may be open circuited under severe overload conditions.
  • Still another object of the invention is the provision of a thin film resistor having a layer of material disposed on at least a portion of the resistive film which has a melting point below the melting point of the resistive film and which when melted chemically reacts with the film to render a portion thereof non-conductive.
  • Yet another object of the invention is the provision of a tin oxide film resistor having a layer of low melting glass frit disposed on at least a portion of the film such that when the resistor is subjected to severe overloads, the glass frit will melt and chemically react with the film so that at least a portion of the film will be made to be non-conductive.
  • FIGS. 1 and 2 are cross sections of a resistor employing the principles of the invention and showing different embodiments of the invention.
  • the invention provides a method of open circuiting a thin film resistor which generally comprises providing a layer of material over at least a portion of the thin film, the material having a melting point below the melting point of the thin film and which when melted chemically reacts with the thin film to render it non-conductive.
  • the resistor of the present invention in general comprises a non-conductive substrate, a resistive film on the substrate, a layer of material disposed on at least a portion of the film and having a melting point below the melting point of the resistive film which when melted chemically reacts with the film to render a portion thereof non-conductive.
  • the resistor of the present invention includes a substrate to which there has been applied a resistive film l2, metallic end caps 14 and 16, electrical lead terminals 18 and 20, and protective cover 24.
  • the substrate is a solid rod; however, it may be tubular if desired.
  • the substrate may be fabricated of a material having a low coefficient of expansion such as a ceramic or alkali free glass.
  • the resistive film 12 may be of several types of material, the invention is particularly adaptable to a tin oxide based film because of its high reliability and stability.
  • Spiralled grooves 22 are provided in the film in order to provide a spiral resistance path 23 of predetermined length to yield a desired resistance. End caps 14 and 16 are fitted over film 12 and secured thereby by virtue of being a press fit.
  • Protective cover 24 is an electrically insulative material.
  • a resistor such as this especially one having a tin oxide based film, has a high degree of stability such that when the resistor is subjected to prolonged or severe overloads the resistor may become red hot and ignite any combustible material nearby.
  • red hot heating of the resistor is prevented by providing a layer 26 of material to at least a portion of the resistive film, the material being such that it will have a melting point lower than the resistive film l2 and which will, when melted, chemically react with the film to dissolve or otherwise render a portion of the film non-conductive thereby opening the circuit.
  • the layer 26 should cover at least one spiral resistance path and is preferably located at or near the center of the resistor.
  • the layer may extend around the entire circumference or periphery of the resistor.
  • the layer may include a spot 27, so long as at least one spiral resistive path is covered by the spot.
  • a suitable material for the layer 26 would be a low melting glass frit such as soda-lime glass.
  • the layer may be applied to the resistive film by some suitable process such as by brushing or roll coating with the aid of a suitable vehicle such as water prior to the protective cover 24 being applied.
  • a resistor comprising:
  • a layer of glass frit material disposed on at least a portion of said resistive tin oxide based film having a melting point below the melting point of said resistive film which when melted chemically reacts with said film to render said portion thereof nonconductive
  • an insulative cover substantially surrounding said film and said caps.
  • a resistor according to claim 4 wherein there are spiral grooves in said resistive film providing a resistive path of a predetermined length and said spot extends across said resistive path.
  • a tin oxide based film is carried on a non-conductive substrate
  • the improvement comprising providing a layer of glass frit material over at least a portion of said tin oxide based material over at least a portion of said tin oxide thin film having a melting point below said thin film which when melted chemically reacts with said thin film to render it non-conductive, and melting said glass frit material upon overloading said resistor.

Landscapes

  • Non-Adjustable Resistors (AREA)
  • Thermistors And Varistors (AREA)
  • Fuses (AREA)
US00195689A 1971-11-04 1971-11-04 Fusing resistor Expired - Lifetime US3735318A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19568971A 1971-11-04 1971-11-04

Publications (1)

Publication Number Publication Date
US3735318A true US3735318A (en) 1973-05-22

Family

ID=22722364

Family Applications (1)

Application Number Title Priority Date Filing Date
US00195689A Expired - Lifetime US3735318A (en) 1971-11-04 1971-11-04 Fusing resistor

Country Status (2)

Country Link
US (1) US3735318A (enrdf_load_stackoverflow)
JP (1) JPS4853242A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836883A (en) * 1971-12-08 1974-09-17 Hokuriku Elect Ind Fuse and resistor device
US4020397A (en) * 1974-09-25 1977-04-26 Westinghouse Electric Corporation Parallel transistor protection circuit
US5097245A (en) * 1987-01-22 1992-03-17 Morrill Glasstek, Inc. Sub-miniature electrical component, particularly a fuse
US5122774A (en) * 1987-01-22 1992-06-16 Morrill Glasstek, Inc. Sub-miniature electrical component, particularly a fuse
US5131137A (en) * 1987-01-22 1992-07-21 Morrill Glasstek, Inc. Method of making a sub-miniature electrical component particularly a fuse
US5155462A (en) * 1987-01-22 1992-10-13 Morrill Glasstek, Inc. Sub-miniature electrical component, particularly a fuse
US5224261A (en) * 1987-01-22 1993-07-06 Morrill Glasstek, Inc. Method of making a sub-miniature electrical component, particularly a fuse
US20070236323A1 (en) * 2004-02-21 2007-10-11 Wickmann-Werke Gmbh Fusible Conductive Coil with an Insulating Intermediate Coil for Fuse Element
CN103843078A (zh) * 2011-09-29 2014-06-04 兴亚株式会社 陶瓷电阻器
US20150262775A1 (en) * 2014-03-17 2015-09-17 Smart Electronics Inc. Fuse resistor
CN108010648A (zh) * 2017-12-28 2018-05-08 安徽省昌盛电子有限公司 半短路定点熔断抗雷击浪涌线绕电阻器
US10347402B1 (en) * 2018-05-23 2019-07-09 Xiamen Set Electronics Co., Ltd. Thermal fuse resistor
US10553384B1 (en) * 2019-04-24 2020-02-04 Conquer Electronics Co., Ltd. Anti-surge winding fusible resistor fuse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH025326A (ja) * 1988-06-23 1990-01-10 Rikiyuu Denki:Kk ヒューズ
JP2795096B2 (ja) * 1992-10-06 1998-09-10 三菱電機株式会社 漏電遮断器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873327A (en) * 1956-04-19 1959-02-10 Bernstein Elliot Combined fuse and current limiting resistor
US2876312A (en) * 1956-09-17 1959-03-03 Gen Electric Fuse link for a time-lag fuse and method of constructing the link
US3289139A (en) * 1964-02-24 1966-11-29 Dale Electronics Film resistance unit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5146897A (ja) * 1974-10-18 1976-04-21 Matsushita Electric Ind Co Ltd Denkieidohyojisochi

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873327A (en) * 1956-04-19 1959-02-10 Bernstein Elliot Combined fuse and current limiting resistor
US2876312A (en) * 1956-09-17 1959-03-03 Gen Electric Fuse link for a time-lag fuse and method of constructing the link
US3289139A (en) * 1964-02-24 1966-11-29 Dale Electronics Film resistance unit

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836883A (en) * 1971-12-08 1974-09-17 Hokuriku Elect Ind Fuse and resistor device
US4020397A (en) * 1974-09-25 1977-04-26 Westinghouse Electric Corporation Parallel transistor protection circuit
US5224261A (en) * 1987-01-22 1993-07-06 Morrill Glasstek, Inc. Method of making a sub-miniature electrical component, particularly a fuse
US5122774A (en) * 1987-01-22 1992-06-16 Morrill Glasstek, Inc. Sub-miniature electrical component, particularly a fuse
US5131137A (en) * 1987-01-22 1992-07-21 Morrill Glasstek, Inc. Method of making a sub-miniature electrical component particularly a fuse
US5155462A (en) * 1987-01-22 1992-10-13 Morrill Glasstek, Inc. Sub-miniature electrical component, particularly a fuse
US5097245A (en) * 1987-01-22 1992-03-17 Morrill Glasstek, Inc. Sub-miniature electrical component, particularly a fuse
US20070236323A1 (en) * 2004-02-21 2007-10-11 Wickmann-Werke Gmbh Fusible Conductive Coil with an Insulating Intermediate Coil for Fuse Element
CN103843078A (zh) * 2011-09-29 2014-06-04 兴亚株式会社 陶瓷电阻器
US20150262775A1 (en) * 2014-03-17 2015-09-17 Smart Electronics Inc. Fuse resistor
US9697969B2 (en) * 2014-03-17 2017-07-04 Smart Electronics Inc. Fuse resistor
CN108010648A (zh) * 2017-12-28 2018-05-08 安徽省昌盛电子有限公司 半短路定点熔断抗雷击浪涌线绕电阻器
CN108010648B (zh) * 2017-12-28 2023-12-22 安徽省昌盛电子有限公司 半短路定点熔断抗雷击浪涌线绕电阻器
US10347402B1 (en) * 2018-05-23 2019-07-09 Xiamen Set Electronics Co., Ltd. Thermal fuse resistor
US10553384B1 (en) * 2019-04-24 2020-02-04 Conquer Electronics Co., Ltd. Anti-surge winding fusible resistor fuse

Also Published As

Publication number Publication date
JPS4853242A (enrdf_load_stackoverflow) 1973-07-26

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Legal Events

Date Code Title Description
AS Assignment

Owner name: EMERSON ELECTRIC CO. A CORP. OF MISSOURI, MISSO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:EMHART INDUSTRIES, INC. A CORP. OF CONNECTICUT;REEL/FRAME:005691/0720

Effective date: 19910125