WO2000002209A1 - Pista resistiva alta temperatura - Google Patents
Pista resistiva alta temperatura Download PDFInfo
- Publication number
- WO2000002209A1 WO2000002209A1 PCT/ES1999/000214 ES9900214W WO0002209A1 WO 2000002209 A1 WO2000002209 A1 WO 2000002209A1 ES 9900214 W ES9900214 W ES 9900214W WO 0002209 A1 WO0002209 A1 WO 0002209A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resistive track
- substrate
- high temperature
- resistive
- potentiometers
- Prior art date
Links
- 239000000758 substrate Substances 0.000 claims abstract description 17
- -1 polytetrafluoroethylene Polymers 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 10
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 7
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 7
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 5
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 5
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 3
- 229920000052 poly(p-xylylene) Polymers 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920002620 polyvinyl fluoride Polymers 0.000 claims description 3
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 2
- 235000010290 biphenyl Nutrition 0.000 claims description 2
- 239000004305 biphenyl Substances 0.000 claims description 2
- 229920002492 poly(sulfone) Polymers 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 2
- 239000004693 Polybenzimidazole Substances 0.000 claims 1
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 229920002480 polybenzimidazole Polymers 0.000 claims 1
- 238000003466 welding Methods 0.000 description 8
- 239000003779 heat-resistant material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229920006293 Polyphenylene terephthalamide Polymers 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000265 Polyparaphenylene Polymers 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/005—Surface mountable, e.g. chip trimmer potentiometer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/30—Apparatus or processes specially adapted for manufacturing resistors adapted for baking
Definitions
- the present specification refers to how its title indicates, to a high temperature resistive track, of the type that is mounted on the small and medium sized potentiometers.
- certain potentiometers are associated in multiple electronic circuits, whose mission is both to expand and reduce the passage of electric current, the resistive track being integrated as a vital element in the said potentiometers, for which different substrates, both rigid and traditional, have been used such as ceramics, phenolic paper, etc., as well as flexible ones based on polyethylene terephthalate, polyethylene naphthalate, etc., with polyethylene terephthalate being commonly used to make resistive carbon tracks.
- One of the known ways of manufacturing resistive tracks is to place carbon-resistive paste on the substrate, previously treated with polyethylene terephthalate with a corona effect, that is,
- zones of the band are plated, which will then be the residual zones.
- the resistive paste is polymerized by applying heat for a predetermined time and not exceeding a certain temperature.
- the tape is punched out, obtaining resistors or resistive plates, which are placed in a plastic housing on top of them to be riveted the metal terminals, so that the corresponding contact is established.
- potentiometers projected to be mounted with surface technology or others together with other components, they are placed in their corresponding circuit base, being welded with different alloys of Sn / Pb, Sn / Pb / Ag, etc., by different processes, such as making them cross infrared furnaces or heat convection ovens, also being among other means the welding by steam phase and, finally, manual welding, suffering in all these cases the high temperature potentiometers for more or less prolonged times, according to the method Welding
- Both polyethylene terephthalate and polyethylene naphthalate generally used in the manufacture of resistive tracks have a melting temperature of around 260 ° C, with a maximum continuous working temperature around 110 ° C, so that at temperatures peak of the various welding methods, especially with infrared welding, the aforementioned materials suffer a slight softening, which favors the riveted terminals that generate a pressure on the resistive plate and establish contact, cause the deformation of the same , when the potentiometer is subjected to high temperatures, therefore said pressure is decreasing, with the consequent loss of contact.
- Another problem caused by the resistive tracks manufactured with the materials currently used for the substrate consists in the deformation of the plate due to heat, producing a variation in the resistive value of the potentiometer and in the geometry of the plate, also producing a deformation of the plate, in the area where the cursor touches the surface of it-, since it exerts a pressure and the resistive plate at the time of welding is softened.
- the potentiometer When the potentiometer leaves the weld and cools, if it is subjected to stress on the terminals or vibration tests, it can lose continuity, that is, the electric current does not pass through it because the terminal does not make good contact , losing the potentiometer reliability, because although it usually works, sometimes it fails.
- the high temperature resistive track has been devised, which involves a substrate based on non-deformable materials at high temperatures, such as polyimide, polyphenylenephthalamide, polyphenyleneterephthalamide, polytetrafluoroethylene, polytrifluorochloroethylene, polyvinyl fluoride, poly-p-xylylene, polibenzimidazole, polysulfone, polyphenylene-base, polyphenylene sulfide the working temperature of these materials being around 240 ° C.
- non-deformable materials at high temperatures such as polyimide, polyphenylenephthalamide, polyphenyleneterephthalamide, polytetrafluoroethylene, polytrifluorochloroethylene, polyvinyl fluoride, poly-p-xylylene, polibenzimidazole, polysulfone, polyphenylene-base, polyphenylene sulfide the working temperature of these materials being around 240 ° C.
- a substrate for resistive tracks can also be obtained based on a central core of less heat-resistant material, such as polyethylene terephthalate or polyethylene naphthalate, with one or its two faces with attached film of the above heat-resistant materials.
- the high temperature resistive tracks object of the present invention provide the essential advantage of their non-deformability, when they are anchored by welding to the base or circuit board, although the heat they have to withstand is greater than necessary to melt the welding material, which translates into perfect contacts, both with the cursor and with its terminal associates.
- Another advantage that is provided with the invention that is recommended is that the projected resistive value for the resistive plate is respected at all times, that is, there is no variation in its value outside the admissible, while the geometry of The resistive plate remains unchanged.
- Figure -1- shows a view of a figure belonging to a radial configuration resistive track by way of example, of the multiple possible forms of radial tracks that can be manufactured with the present invention.
- Figure -2- shows a view of a figure belonging to a resistive track of linear configuration by way of example, of the many possible ways of linear tracks that can be manufactured with the present invention.
- Figure -3- broadly shows a section, in which the single layer substrate can be observed, on which the resistive paste has been arranged.
- Figure -4- broadly shows a section of the substrate based on two layers, on which the resistive paste has been placed.
- Figure -5- broadly shows a section of the substrate based on multiple layers, with the resistive paste on its upper face.
- a substrate (3) consisting of one or multiple layers of variable thickness (4), ( 5), (6), (7), (8) and (9), whose optional materials may be: polyimide, polyphenylenephthalamide, polyphenyleneterephthalamide, polytetrafluoroethylene, polytrifluorochloroethylene, polyvinyl fluor
- a substrate for resistive track can be formed by means of a base of less heat-resistant material, such as polyethylene terephthalate and polyethylene naphthalate or the like, with one or both sides leading to a film of variable thickness attached of any of the heat resistant materials mentioned above.
- a base of less heat-resistant material such as polyethylene terephthalate and polyethylene naphthalate or the like
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Adjustable Resistors (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU46169/99A AU4616999A (en) | 1998-07-06 | 1999-07-06 | High temperature resistive track |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9801423A ES2150859B1 (es) | 1998-07-06 | 1998-07-06 | Pista resistiva alta temperatura. |
ESP9801423 | 1998-07-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000002209A1 true WO2000002209A1 (es) | 2000-01-13 |
Family
ID=8304410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/ES1999/000214 WO2000002209A1 (es) | 1998-07-06 | 1999-07-06 | Pista resistiva alta temperatura |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU4616999A (es) |
ES (1) | ES2150859B1 (es) |
WO (1) | WO2000002209A1 (es) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2324097A1 (fr) * | 1975-09-10 | 1977-04-08 | Eurofarad | Element resistant notamment pour potentiometres |
EP0317256A2 (en) * | 1987-11-20 | 1989-05-24 | Junkosha Co. Ltd. | A printed circuit substrate |
WO1991013444A1 (en) * | 1990-02-20 | 1991-09-05 | Hughes Aircraft Company | Articles containing an ion-conductive polymer and method of making the same |
US5812048A (en) * | 1993-11-24 | 1998-09-22 | Rochester Gauges, Inc. | Linear positioning indicator |
-
1998
- 1998-07-06 ES ES9801423A patent/ES2150859B1/es not_active Expired - Fee Related
-
1999
- 1999-07-06 AU AU46169/99A patent/AU4616999A/en not_active Abandoned
- 1999-07-06 WO PCT/ES1999/000214 patent/WO2000002209A1/es active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2324097A1 (fr) * | 1975-09-10 | 1977-04-08 | Eurofarad | Element resistant notamment pour potentiometres |
EP0317256A2 (en) * | 1987-11-20 | 1989-05-24 | Junkosha Co. Ltd. | A printed circuit substrate |
WO1991013444A1 (en) * | 1990-02-20 | 1991-09-05 | Hughes Aircraft Company | Articles containing an ion-conductive polymer and method of making the same |
US5812048A (en) * | 1993-11-24 | 1998-09-22 | Rochester Gauges, Inc. | Linear positioning indicator |
Also Published As
Publication number | Publication date |
---|---|
AU4616999A (en) | 2000-01-24 |
ES2150859A1 (es) | 2000-12-01 |
ES2150859B1 (es) | 2001-06-16 |
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