US3808045A - Method of manufacture of electric contacts - Google Patents
Method of manufacture of electric contacts Download PDFInfo
- Publication number
- US3808045A US3808045A US00151934A US15193471A US3808045A US 3808045 A US3808045 A US 3808045A US 00151934 A US00151934 A US 00151934A US 15193471 A US15193471 A US 15193471A US 3808045 A US3808045 A US 3808045A
- Authority
- US
- United States
- Prior art keywords
- paste
- carbon varnish
- filament
- electric contacts
- microresistors
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 27
- 239000002966 varnish Substances 0.000 claims abstract description 27
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 238000000576 coating method Methods 0.000 claims abstract description 19
- 239000011230 binding agent Substances 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 9
- 229910052709 silver Inorganic materials 0.000 claims abstract description 9
- 239000004332 silver Substances 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims description 2
- 230000004907 flux Effects 0.000 abstract description 7
- 150000001875 compounds Chemical class 0.000 abstract description 4
- 230000006378 damage Effects 0.000 abstract description 4
- 150000002894 organic compounds Chemical class 0.000 abstract description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 7
- 239000004568 cement Substances 0.000 description 4
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 241000779819 Syncarpia glomulifera Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000001739 pinus spp. Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229940036248 turpentine Drugs 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/28—Apparatus or processes specially adapted for manufacturing resistors adapted for applying terminals
- H01C17/281—Apparatus or processes specially adapted for manufacturing resistors adapted for applying terminals by thick film techniques
- H01C17/283—Precursor compositions therefor, e.g. pastes, inks, glass frits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49082—Resistor making
- Y10T29/49087—Resistor making with envelope or housing
- Y10T29/49098—Applying terminal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49082—Resistor making
- Y10T29/49101—Applying terminal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2918—Rod, strand, filament or fiber including free carbon or carbide or therewith [not as steel]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2933—Coated or with bond, impregnation or core
- Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
- Y10T428/2942—Plural coatings
- Y10T428/2949—Glass, ceramic or metal oxide in coating
Definitions
- ABSTRACT A method for manufacturing electric contacts for carbon varnish filament microresistors consisting of coating the carbon varnish coating on the microresistor with a layer of a current-conducting paste containing a binder and having flux properties, thereafter, said paste is fired at a temperature which does not cause destruction of the organic compound of the carbon varnish coating, then a flux is applied onto the layer of said paste and the fluxed portions are tinned.
- the paste comprises a compound including an organic binder based on glyptal resins and finely-dispersed silver having a weight ratio of 1:24.
- the present invention relates to electronic instruments engineering and, more particularly, it relates to methods'of making electric contacts of carbon varnish filament microresistors used in the process of manufacture of various small-size instruments.
- BACKGROUND OF THE INVENTION Widely known in the art is a method of manufacture of electric contacts of carbon varnish filament microresistors by applying them onto the carbon varnish coating of a microresistor.
- the contacts are made of a current-conducting compound of the current-conducting cement type.
- the microresistors with contacts of current-conducting cement can be mounted only with glueing them by the same currentconducting cement compound and cannot be soldered since the current-conducting cement cannot be tinned, and this limits the field of application of such contacts.
- An object of the present invention is to provide a method for manufacturing electric contacts of carbon varnish filament microresistors free from the abovementioned disadvantages.
- the main object of the invention is to provide such a method of manufacture of electric contacts of carbon varnish filament microresistors which can be used for producing a contact capable of being tinned and providing for mounting of such contacts by means of soldering or welding operations.
- This object is attained by providing a method of making electric contacts of carbon varnish filament microresistors, in which, according to the invention, there is applied onto the carbon varnish coating in the locations of the contacts a layer of current-conducting paste having. a binder base and featuring fluxing properties, which paste is then fired at a temperature causing no destruction of the carbon varnish coating, then a flux is applied onto the paste layer and the fluxed portions are tinned.
- the paste is preferably applied in bands around a continuously moving thread filament with a carbon varnish coating, which after tinning is preferably cut into lengths through the line in the middle of the bands.
- the paste is preferably composed of an organic binder based on glyptal resins and finely-dispersed silver in a weight ratio of 1:24.
- finely-dispersed silver glyptal resin dibutyl phthalate solvent xylol and turpentine in ratio, respectively, 0.4 ml
- an alcohol-rosin or salicyclic acid-inglycerine flux is applied and the fluxed portions are tinned during 3-5 hours with a lead-tin compound with low-melting additives, for example, cadmium, at a temperature of l40l80C.
- a lead-tin compound with low-melting additives for example, cadmium
- the temperature of firing the paste and the temperature of tinning must be much lower than the temperature of polymerization of the resistive coating and this is a necessary condition for maintaining a constant value of resistance of this coating.
- the filament After tinning the filament is cut into lengths in the middle of each band thus obtaining microresistors with tinned contacts at each end.
- the proposed method is advantageous in that it allows one to make tinned contacts of microresistors which then can be mounted by means of welding or soldering operations.
- a method of manufacture of electric contacts for carbon varnish coated filament microresistors comprising the step of applying onto the carbon varnish coating of the microresistor a layer of paste having fluxing properties, said paste comprising an organic binder based on glyptal resins and a finelydispersed silver; then firing said paste at a temperature causing no destruction of the organic compound of the carbon varnish coating; thereafter, applying a flux onto the layer of said paste and tinningthe fluxed portions.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Apparatuses And Processes For Manufacturing Resistors (AREA)
- Paints Or Removers (AREA)
Abstract
A method for manufacturing electric contacts for carbon varnish filament microresistors consisting of coating the carbon varnish coating on the microresistor with a layer of a current-conducting paste containing a binder and having flux properties, thereafter, said paste is fired at a temperature which does not cause destruction of the organic compound of the carbon varnish coating, then a flux is applied onto the layer of said paste and the fluxed portions are tinned. The paste comprises a compound including an organic binder based on glyptal resins and finely-dispersed silver having a weight ratio of 1:24.
Description
United States Patent [191 Knyazhev et a1.
[451 Apr. 30, 1974 [54] METHOD OF MANUFACTURE OF ELECTRIC CONTACTS [22] Filed: June 10, 1971 [21 Appl. No.: 151,934
[52] U.S. Cl 117/226, 117/216, 117/217, 117/227, 117/228, 29/619, 29/621, 338/309,
[51] Int. Cl B44d l/l8 [58] Field of Search 117/216, 226, 228, 217, 117/227, 212; 338/309, 327, 329, 332;
[56] References Cited UNITED STATES PATENTS 2,134,870 l1/l938 Fruth 117/216 2,144,925 l/l939 Lawrence et al. 1 17/226 3,416,347 2/ 1947 Rector 29/619 3,496,512 2/ 1970 Matsuoka et a1. 29/621 Primary ExaminerCameron K. Weiffenbach Attorney, Agent, or FirmWaters, Roditi, Schwartz & Nissen [5 7] ABSTRACT A method for manufacturing electric contacts for carbon varnish filament microresistors consisting of coating the carbon varnish coating on the microresistor with a layer of a current-conducting paste containing a binder and having flux properties, thereafter, said paste is fired at a temperature which does not cause destruction of the organic compound of the carbon varnish coating, then a flux is applied onto the layer of said paste and the fluxed portions are tinned.
The paste comprises a compound including an organic binder based on glyptal resins and finely-dispersed silver having a weight ratio of 1:24.
3 Claims, No Drawings METHOD OF MANUFACTURE OF ELECTRIC CONTACTS The present invention relates to electronic instruments engineering and, more particularly, it relates to methods'of making electric contacts of carbon varnish filament microresistors used in the process of manufacture of various small-size instruments.
BACKGROUND OF THE INVENTION Widely known in the art is a method of manufacture of electric contacts of carbon varnish filament microresistors by applying them onto the carbon varnish coating of a microresistor. In this case the contacts are made of a current-conducting compound of the current-conducting cement type. The microresistors with contacts of current-conducting cement can be mounted only with glueing them by the same currentconducting cement compound and cannot be soldered since the current-conducting cement cannot be tinned, and this limits the field of application of such contacts.
SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing electric contacts of carbon varnish filament microresistors free from the abovementioned disadvantages.
The main object of the invention is to provide such a method of manufacture of electric contacts of carbon varnish filament microresistors which can be used for producing a contact capable of being tinned and providing for mounting of such contacts by means of soldering or welding operations.
This object is attained by providing a method of making electric contacts of carbon varnish filament microresistors, in which, according to the invention, there is applied onto the carbon varnish coating in the locations of the contacts a layer of current-conducting paste having. a binder base and featuring fluxing properties, which paste is then fired at a temperature causing no destruction of the carbon varnish coating, then a flux is applied onto the paste layer and the fluxed portions are tinned.
The paste is preferably applied in bands around a continuously moving thread filament with a carbon varnish coating, which after tinning is preferably cut into lengths through the line in the middle of the bands.
The paste is preferably composed of an organic binder based on glyptal resins and finely-dispersed silver in a weight ratio of 1:24.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The invention will be apparent from the following detailed description of an example of carrying the proposed method into effect.
Onto a continuously moving wound glass filament serving as the base of the microresistor, on which there has been previously applied a carbon varnish resistive coating based on teraphthalic resins, are supplied bands of current-conducting paste consisting of an organic binder based on glyptal resins and finelydispersed silver in a weight ratio of 1:24 respectively, in the places where contacts are desired.
finely-dispersed silver glyptal resin dibutyl phthalate solvent: xylol and turpentine in ratio, respectively, 0.4 ml
per 1 g of finely-dispersed silver I parts by weight 10 parts by weight l6 parts by weight The bands of the current-conducting paste are fired at a temperature of 280-300C during 30-60 seconds.
After that an alcohol-rosin or salicyclic acid-inglycerine flux is applied and the fluxed portions are tinned during 3-5 hours with a lead-tin compound with low-melting additives, for example, cadmium, at a temperature of l40l80C.
The temperature of firing the paste and the temperature of tinning must be much lower than the temperature of polymerization of the resistive coating and this is a necessary condition for maintaining a constant value of resistance of this coating.
After tinning the filament is cut into lengths in the middle of each band thus obtaining microresistors with tinned contacts at each end.
The proposed method is advantageous in that it allows one to make tinned contacts of microresistors which then can be mounted by means of welding or soldering operations.
The proposed method of manufacture of resistors with tinned contacts in the form of bands can be fully automated.
We claim:
1. A method of manufacture of electric contacts for carbon varnish coated filament microresistors, said method comprising the step of applying onto the carbon varnish coating of the microresistor a layer of paste having fluxing properties, said paste comprising an organic binder based on glyptal resins and a finelydispersed silver; then firing said paste at a temperature causing no destruction of the organic compound of the carbon varnish coating; thereafter, applying a flux onto the layer of said paste and tinningthe fluxed portions.
2. A method of manufacture of electric contacts of carbon varnish coated filament microresistors as claimed in claim 1, in which said paste is applied as bands around a continuously moving filament having a carbon varnish coating, followed by tinning said bands and cutting the filament into portions in the middle of said bands.
3. A method of manufacture of electric contacts of carbon varnish coated filament microresistors as claimed in claim 1, in which the paste applied onto the carbon varnish coating contains an organic binder based on glyptal resins and finely-dispersed silver in a weight ratio of l 24.
Claims (2)
- 2. A method of manufacture of electric contacts of carbon varnish coated filament microresistors as claimed in claim 1, in which said paste is applied as bands around a continuously moving filament having a carbon varnish coating, followed by tinning said bands and cutting the filament into portions in the middle of said bands.
- 3. A method of manufacture of electric contacts of carbon varnish coated filament microresistors as claimed in claim 1, in which the paste applied onto the carbon varnish coating contains an organic binder based on glyptal resins and finely-dispersed silver in a weight ratio of 1 : 24.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1803771A GB1356844A (en) | 1971-05-28 | 1971-05-28 | Manufacture of electric contacts |
| US00151934A US3808045A (en) | 1971-05-28 | 1971-06-10 | Method of manufacture of electric contacts |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1803771A GB1356844A (en) | 1971-05-28 | 1971-05-28 | Manufacture of electric contacts |
| US00151934A US3808045A (en) | 1971-05-28 | 1971-06-10 | Method of manufacture of electric contacts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3808045A true US3808045A (en) | 1974-04-30 |
Family
ID=26253085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00151934A Expired - Lifetime US3808045A (en) | 1971-05-28 | 1971-06-10 | Method of manufacture of electric contacts |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3808045A (en) |
| GB (1) | GB1356844A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3940509A (en) * | 1973-12-19 | 1976-02-24 | Universal Oil Products Company | Semi-conducting materials and a method for the manufacture thereof |
| US4176336A (en) * | 1977-06-27 | 1979-11-27 | U.S. Philips Corporation | Lacquer-encapsulated carbon film resistor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2134870A (en) * | 1936-03-14 | 1938-11-01 | Mallory & Co Inc P R | Resistance element |
| US2144925A (en) * | 1936-07-02 | 1939-01-24 | Mallory & Co Inc P R | Variable resistance unit |
| US3416347A (en) * | 1965-10-29 | 1968-12-17 | Yoder Co | Slitting and edge conditioning means |
| US3496512A (en) * | 1966-05-16 | 1970-02-17 | Matsushita Electric Ind Co Ltd | Non-linear resistors |
-
1971
- 1971-05-28 GB GB1803771A patent/GB1356844A/en not_active Expired
- 1971-06-10 US US00151934A patent/US3808045A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2134870A (en) * | 1936-03-14 | 1938-11-01 | Mallory & Co Inc P R | Resistance element |
| US2144925A (en) * | 1936-07-02 | 1939-01-24 | Mallory & Co Inc P R | Variable resistance unit |
| US3416347A (en) * | 1965-10-29 | 1968-12-17 | Yoder Co | Slitting and edge conditioning means |
| US3496512A (en) * | 1966-05-16 | 1970-02-17 | Matsushita Electric Ind Co Ltd | Non-linear resistors |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3940509A (en) * | 1973-12-19 | 1976-02-24 | Universal Oil Products Company | Semi-conducting materials and a method for the manufacture thereof |
| US4176336A (en) * | 1977-06-27 | 1979-11-27 | U.S. Philips Corporation | Lacquer-encapsulated carbon film resistor |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1356844A (en) | 1974-06-19 |
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