EP0001520B1 - Résistance électrique plane de haute précision et de valeur ohmique ajustable et procédé pour ajuster cette valeur ohmique - Google Patents

Résistance électrique plane de haute précision et de valeur ohmique ajustable et procédé pour ajuster cette valeur ohmique Download PDF

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Publication number
EP0001520B1
EP0001520B1 EP78400081A EP78400081A EP0001520B1 EP 0001520 B1 EP0001520 B1 EP 0001520B1 EP 78400081 A EP78400081 A EP 78400081A EP 78400081 A EP78400081 A EP 78400081A EP 0001520 B1 EP0001520 B1 EP 0001520B1
Authority
EP
European Patent Office
Prior art keywords
circuits
sheet
resistive
rtn
value
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
Application number
EP78400081A
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German (de)
English (en)
French (fr)
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EP0001520A1 (fr
Inventor
Bernard Frere
Jean Morlet
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FRANCAISE DE L'ELECTRO-RESISTANCE Ste
Original Assignee
FRANCAISE DE L'ELECTRO-RESISTANCE Ste
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/22—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming
    • H01C17/23—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by opening or closing resistor geometric tracks of predetermined resistive values, e.g. snapistors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/16—Resistor networks not otherwise provided for

Definitions

  • the present invention relates to a planar electrical resistance of high precision and adjustable ohmic value.
  • the invention also relates to a method for adjusting the ohmic value of the above-mentioned electrical resistance.
  • High precision resistors are already known which are obtained by etching a sheet of metal or of an alloy so as to obtain a multitude of electric resistant filaments separated by grooves or slots. Such resistance and its manufacturing process is described in the Belgian patent published under number 851308.
  • the aforementioned methods make it possible to obtain a resistive circuit of sinuous contour and of great length.
  • the electrical resistance filaments etched in the metal or alloy sheet have a thickness which does not exceed a few microns, so that these resistors have a very high ohmic value per unit area.
  • resistors After mass production, these resistors must be adjusted to a precise resistance value which is sometimes 50 to 150% higher than the initial resistance value.
  • this value is adjusted by making between the edge of the resistor and the grooves which separate the electric resistant filaments from the cutouts intended to switch on a predetermined number of these filaments, so as to increase the ohmic value.
  • This adjustment of the resistance by cutting is very delicate. Indeed, this operation must be carried out under a microscope by scraping, sandblasting or laser. Furthermore, this operation is very long, because it is often necessary to make a very large number of cuts, taking into account the high number of electric resistant filaments contained in each resistor. Thus, for example, to adjust the ohmic value of a resistor having an initial value of 23 kiloohms to 42 kiloohms, it is necessary to make 102 cuts on the sides of the resistor.
  • the object of the present invention is to provide a planar electrical resistance, the ohmic value of which can be adjusted in a much more convenient and rapid manner than in the case of the above-mentioned resistors.
  • the planar electrical resistance targeted by the invention comprises a sheet of metal or of alloy deposited or glued on a support comprising several sinuous and interconnectable electrical resistance circuits each of which consists of a series of resistant electrical filaments separated by grooves, some of the said electrical resistive circuits being short-circuited by conductive strips formed by the metal or the alloy of the sheet, these resistive circuits being interconnectable by making cuts in said conductive strips, the ohmic value of the resistance being equal to RTn when interconnected n electrical circuits in series and this value being equal to RTn-1 when n-1 circuits are interconnected in series.
  • cutouts are made in the sheet intended to put in series with the rest of the circuit, the electric resistance circuit (s) whose ohmic value corresponds to the ohmic adjustment value desired for resistance.
  • the invention also relates to a high precision electrical resistance as defined above, in which the metal or alloy sheet is deposited or sealed on a substrate having a coefficient of thermal conductivity, generally equal to or higher than that alumina, sufficient to avoid a too high temperature gradient between the resistive parts in circuit and those still short-circuited.
  • the invention also relates to the method for adjusting the ohmic value of the above-mentioned electrical resistance.
  • This process is characterized in that such a cut is made first in the conductive strip corresponding to a circuit such that the increase in the ohmic value is as close as possible to the desired adjustment value, then the l '' adjustment by successively switching on resistive circuits giving rise to increasingly small increases in the ohmic value.
  • each circuit is generally constituted by several parallel resistant filaments which extend over a relatively large width, the cutting requires a precision which is much less than in the known method.
  • the electrical resistance circuits are grouped into four rectangular blocks arranged along each of the sides of a square or rectangular sheet.
  • the resistive circuits of each block it is advantageous for the resistive circuits of each block to be identified by a number engraved in a conductive strip situated opposite the various resistive circuits.
  • a planar electrical resistance obtained from a square sheet 10, of a metal alloy having a thickness of a few microns, such as nickel-chromium.
  • the electrical resistance circuit of this resistance is obtained in a manner known per se, preferably by electrolytic machining or by ion bombardment through a mask comprising windows defining the outline of the electrical circuit to be etched on the sheet 10.
  • This sheet 10 is deposited or sealed on an electrical insulating support, not shown, having a coefficient of thermal conductivity equal to or greater than that of alumina of purity equal to 96%.
  • the electrical resistant filaments 11 are shown in FIG. 1 between parallel lines which designate the grooves or slots 12 of the resistor.
  • a real representation of part of the electrical resistance circuit is shown in Figure 2.
  • the resistor comprises a multitude of parallel filaments 11 which define a sinuous electric circuit of great length and consequently of great ohmic value per unit of surface.
  • Sheet 10 includes a series of resistive circuits appended to A 1 A 2 , A 3 ; B 1 ' B 2' B 3 ; C 1 , C 2 , C 3 , ..., C8; D 1 ' D 2 , ..., Dg whose increase ⁇ R in intrinsic ohmic values follows the relationship: RTn being the ohmic value of n resistive circuits and RTn-1 being the ohmic value of n-1 interconnected resistive circuits and where K is an adjustable numerical coefficient lower than 1.
  • circuit A 1 has a greater number of filaments 11 than that of the circuit A 2 which itself has a greater number of filaments 11 than the other circuits A 3 , 8 1 , B 2 , etc.
  • This converging series can be a geometric progression.
  • the resistance obtained after manufacture has an initial resistance RT o constituted by the ohmic value of the set of electrical resistant filaments which do not belong to the circuits A 1 ' .... B 1 , ..., Ci, ...,.
  • This operation is carried out by making in the conductive strips such as 13, 14, 15, 16, 17 or 18, a cutout 19 (see FIG. 2) which extends between the side A or B, C of the sheet 10 and the corresponding circuit A 3 .
  • These cuts such as 19 are made in a manner known per se, for example by scraping by means of a point, by sandblasting or by laser.
  • a multiplier coefficient M equal to the ratio RTn (RTn being the ohmic value obtained RTo when all the attached circuits are connected) is generally close to 2.
  • the bands 13, 14, 15 have been etched; 16, 17 or 18, together with the various electrical resistance circuits A 1 ' .., B i , ..., C 1 , ..., D 1' .., reference numbers 1, 2, 3 , ..., 9 and a slot such as 20 (see Figure 2) which extends between these numbers and the corresponding circuit A 3 .
  • the electrical resistant circuits A 1 ' ..., B ,, ..., C 1 , ..., D 1' ... are grouped into four rectangular blocks 21, 22, 23, 24 distinct, arranged along each of the sides A, B, C, D of the sheet 10. This arrangement further facilitates the identification of circuits.
  • This nonlimiting example shows how to create a resistance adjustment law according to the method according to the invention.
  • This resistance is characterized by a number of adjustment points equal to 23 and a multiplying coefficient M equal to 2.
  • the multiplying coefficient is the ratio between the value of the resistance when all the points have been adjusted and its initial value.
  • the resistance has an initial ohmic value RTo equal to 15 kiloohms. We want to adjust this value to 25,000 ohms ⁇ 0.1%. The initial value must therefore be increased from 66.51% to 66.83%, in order to be within tolerance ⁇ 0.1%.
  • points A 1 and A 2 have respective weights equal to 33.6% and 22.6%.
  • a cut such as 19 is therefore carried out, as indicated above.
  • the adjustment of the resistance can still be carried out by a simple scraping between the number in question and the adjacent edge of the resistor.
  • the invention also makes it possible to limit the risks of error so that the reliability of the precision obtained is statistically much greater than in the case of the known method.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Non-Adjustable Resistors (AREA)
  • Electronic Switches (AREA)
  • Adjustable Resistors (AREA)
EP78400081A 1977-09-29 1978-08-29 Résistance électrique plane de haute précision et de valeur ohmique ajustable et procédé pour ajuster cette valeur ohmique Expired EP0001520B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7729381 1977-09-29
FR7729381A FR2404902A1 (fr) 1977-09-29 1977-09-29 Procede pour la fabrication de resistances electriques planes de haute precision et resistances s'y rapportant

Publications (2)

Publication Number Publication Date
EP0001520A1 EP0001520A1 (fr) 1979-04-18
EP0001520B1 true EP0001520B1 (fr) 1981-09-09

Family

ID=9195928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78400081A Expired EP0001520B1 (fr) 1977-09-29 1978-08-29 Résistance électrique plane de haute précision et de valeur ohmique ajustable et procédé pour ajuster cette valeur ohmique

Country Status (13)

Country Link
EP (1) EP0001520B1 (cs)
JP (1) JPS5824001B2 (cs)
AT (1) AT366510B (cs)
CS (1) CS243452B2 (cs)
DD (1) DD139324A5 (cs)
DE (1) DE2861056D1 (cs)
DK (1) DK144778C (cs)
ES (1) ES473467A1 (cs)
FR (1) FR2404902A1 (cs)
HU (1) HU176711B (cs)
IL (1) IL55475A (cs)
IT (1) IT1106584B (cs)
NO (1) NO782918L (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11901850B2 (en) 2019-12-18 2024-02-13 Milwaukee Electric Tool Corporation Power tool having stamped brake resistor

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191938A (en) * 1978-07-03 1980-03-04 International Business Machines Corporation Cermet resistor trimming method
FR2473214A1 (fr) * 1980-01-04 1981-07-10 Thomson Csf Plaquette de resistances en ligne a tres faible pas et barrette d'impression thermique utilisant cette plaquette de resistances en ligne
US4375056A (en) * 1980-02-29 1983-02-22 Leeds & Northrup Company Thin film resistance thermometer device with a predetermined temperature coefficent of resistance and its method of manufacture
JPS5965408A (ja) * 1982-10-05 1984-04-13 松下電器産業株式会社 厚膜抵抗の製造方法
US4862136A (en) * 1983-04-13 1989-08-29 Birkner John M Programmable resistance network
DE112005001155T5 (de) 2004-05-18 2007-04-19 NGK Spark Plug Co., Ltd., Nagoya Widerstandselement, sein Vorläufer, und Verfahren zur Widerstandswerteinstellung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2058583A5 (cs) * 1969-09-17 1971-05-28 Bochkarev Boris
IT1026380B (it) * 1974-04-10 1978-09-20 Draloric Electronic Elemento costruttivo elettrico per circuiti a film spesso o film sottile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11901850B2 (en) 2019-12-18 2024-02-13 Milwaukee Electric Tool Corporation Power tool having stamped brake resistor

Also Published As

Publication number Publication date
NO782918L (no) 1979-03-30
CS609378A2 (en) 1985-08-15
DK376578A (da) 1979-03-30
EP0001520A1 (fr) 1979-04-18
IL55475A (en) 1980-09-16
ES473467A1 (es) 1979-05-01
ATA698078A (de) 1981-08-15
HU176711B (en) 1981-04-28
CS243452B2 (en) 1986-06-12
IT7851189A0 (it) 1978-09-21
DE2861056D1 (en) 1981-11-26
DK144778B (da) 1982-06-01
JPS5461661A (en) 1979-05-18
IL55475A0 (en) 1978-12-17
JPS5824001B2 (ja) 1983-05-18
FR2404902B1 (cs) 1980-08-01
FR2404902A1 (fr) 1979-04-27
DD139324A5 (de) 1979-12-19
IT1106584B (it) 1985-11-11
DK144778C (da) 1982-10-18
AT366510B (de) 1982-04-26

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