US3889098A - Switching device having contacts of two or more layers - Google Patents
Switching device having contacts of two or more layers Download PDFInfo
- Publication number
- US3889098A US3889098A US466713A US46671374A US3889098A US 3889098 A US3889098 A US 3889098A US 466713 A US466713 A US 466713A US 46671374 A US46671374 A US 46671374A US 3889098 A US3889098 A US 3889098A
- Authority
- US
- United States
- Prior art keywords
- layer
- metal
- melting point
- contacts
- thickness
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/0201—Materials for reed contacts
Definitions
- the invention relates to a switching device ,having moving contacts.
- Such devices using reed contacts in a miniaturized form in a hermetically closed envelope have in recent years been frequently used in modern telephone exchanges, computer systems and data transmission systems.
- the contact members generally at the ends of resilient conductors are jointly present in a closed space filled with a shield gas.
- the conductors consist of magnetic material by which the contact can be opened or closed with the aid of coils or permanent magnets placed outside the envelope.
- Another form of load is the so-called logics load under a voltage of 12 Volt.
- the switching device having a contact coating con sisting of at least two layers is characterized in that the inner layer having a thickness of at least 0.5 uum consists of a metal having a melting point of more than l800C on which an interrupted or uninterrupted layer having a thickness of 0.01 l gum is present consisting of a metal or a metal alloy having a melting point of less thant 500C.
- a layer having a thickness of 0.5 5 ,uum consisting of noble metal having a melting point of more than l800C is present on the layer consisting of metal having a melting point of less than 500C.
- any metal having a melting point of more than l800C may be used, hence for example also molybdenum which due to oxidation is unsuitable for use as a possible outer layer.
- the thin intermediate layer having a melting point of less than 500C may consist of a Pb-Sn alloy, Bi, Woods metal, lead, tin etc.
- the layer need not be uninterrupted but may also consist of isolated aggregates having a coating of the surface up to at least 10 particles per sq.mm.
- the techniques with which the layer combination according to the invention is provided are cathodic sputtering, vapour deposition and electrodeposition, but with a clear preference for the first-mentioned technique.
- Reed contact whose part to be sealed within the envelope is approximately 7 mm long and 0.5 mm wide and which consist of magnetic nickel iron are successively coated in a conventional cathode sputtering device with a layer of Cu having a thickness of 0.5 num, a layer of Mo having a thickness of 2.0 num, a layer of a PbSn-alloy 1.1 percent by weight) having a thickness of0.0l [.LLIIII and finally a layer of Ru having a thickness of 0.1 uu.
- the argon pressure during sputtering is 10' mm Hg, the voltage is 1500 V, 1500 V, 800 V and 1500 V, respectively, and the current is 1A, 1.2A, 0.2A and 0.4A, respectively.
- the ruthenium layer When the ruthenium layer is not used and the outer layer thus consists of Pb-Sn, Bi or Wood's metal a contact coating is obtained whose resistance in case of unloaded switching increases to several dozen ohms. In case of loaded switching the result is slightly less than in the contacts having a ruthenium outer layer, but they amply satisfy the requirement of 0.5-3 X 10 switching operations being admissible without increasing the contact resistance.
- a switching device having moving contacts of which at least the contact surface is clad with a contact coating which consists of at least two layers, characterized in that the inner layer having a thickness of at least 0.5 /,u.m of a metal having a melting point of more than terized in that a layer having a thickness of 0.1 -5 pm 5 p consisting of a noble metal having a melting point of more than l800C is present on the layer consisting of metal having a melting point of less than 500C.
Landscapes
- Contacts (AREA)
- Thyristors (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NLAANVRAGE7306445,A NL169530C (nl) | 1973-05-09 | 1973-05-09 | Schakelinrichting met tongcontacten. |
Publications (1)
Publication Number | Publication Date |
---|---|
US3889098A true US3889098A (en) | 1975-06-10 |
Family
ID=19818822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US466713A Expired - Lifetime US3889098A (en) | 1973-05-09 | 1974-05-03 | Switching device having contacts of two or more layers |
Country Status (12)
Country | Link |
---|---|
US (1) | US3889098A (de) |
JP (1) | JPS576765B2 (de) |
AT (1) | AT327311B (de) |
BE (1) | BE814679A (de) |
CH (1) | CH600523A5 (de) |
DE (1) | DE2419102C3 (de) |
ES (1) | ES426054A1 (de) |
FR (1) | FR2229128B1 (de) |
GB (1) | GB1449083A (de) |
IT (1) | IT1010437B (de) |
NL (1) | NL169530C (de) |
SE (1) | SE387770B (de) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4088803A (en) * | 1974-09-19 | 1978-05-09 | Fujitsu Limited | Electrical contact and process of manufacture |
US4109125A (en) * | 1975-05-28 | 1978-08-22 | Bbc Brown, Boveri & Company Limited | Contact arrangement for an electric arc-electrode consisting of graphite and a method for the manufacture thereof |
US4117291A (en) * | 1977-05-19 | 1978-09-26 | Gte Automatic Electric Laboratories Incorporated | Reed switch |
US4129765A (en) * | 1976-08-25 | 1978-12-12 | W. C. Heraeus Gmbh | Electrical switching contact |
US4607148A (en) * | 1985-08-08 | 1986-08-19 | General Electric Company | Change of state contact material for electric circuit interrupters |
US5325079A (en) * | 1993-01-21 | 1994-06-28 | Kaloust P. Sogoian | Electromagnetic relay with integral contacts |
US20080258852A1 (en) * | 2007-04-18 | 2008-10-23 | Key Safety Systems, Inc. | Reed switch contact coating |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6419214A (en) * | 1987-07-13 | 1989-01-23 | Satoru Yoshinaka | Disposal at sea of combustible industrial waste |
JPH0730900B2 (ja) * | 1989-09-26 | 1995-04-10 | 川崎汽船株式会社 | 生活系廃棄物焼却プラント |
US5892424A (en) * | 1995-02-10 | 1999-04-06 | The Furukawa Electric Co., Ltd. | Encapsulated contact material and a manufacturing method therefor, and a manufacturing method and a using method for an encapsulated contact |
DE19930449A1 (de) * | 1999-07-02 | 2001-01-18 | Heraeus Gmbh W C | Palladiumfreier Kontaktwerkstoff |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3663777A (en) * | 1969-08-29 | 1972-05-16 | Philips Corp | Reed switch |
-
1973
- 1973-05-09 NL NLAANVRAGE7306445,A patent/NL169530C/xx not_active IP Right Cessation
-
1974
- 1974-04-20 DE DE2419102A patent/DE2419102C3/de not_active Expired
- 1974-05-03 US US466713A patent/US3889098A/en not_active Expired - Lifetime
- 1974-05-06 AT AT371574A patent/AT327311B/de not_active IP Right Cessation
- 1974-05-06 IT IT22326/74A patent/IT1010437B/it active
- 1974-05-06 CH CH615174A patent/CH600523A5/xx not_active IP Right Cessation
- 1974-05-06 GB GB1981874A patent/GB1449083A/en not_active Expired
- 1974-05-06 SE SE7405994A patent/SE387770B/xx not_active IP Right Cessation
- 1974-05-07 ES ES426054A patent/ES426054A1/es not_active Expired
- 1974-05-07 BE BE144035A patent/BE814679A/xx unknown
- 1974-05-08 FR FR7415876A patent/FR2229128B1/fr not_active Expired
- 1974-05-08 JP JP5035074A patent/JPS576765B2/ja not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3663777A (en) * | 1969-08-29 | 1972-05-16 | Philips Corp | Reed switch |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4088803A (en) * | 1974-09-19 | 1978-05-09 | Fujitsu Limited | Electrical contact and process of manufacture |
US4109125A (en) * | 1975-05-28 | 1978-08-22 | Bbc Brown, Boveri & Company Limited | Contact arrangement for an electric arc-electrode consisting of graphite and a method for the manufacture thereof |
US4129765A (en) * | 1976-08-25 | 1978-12-12 | W. C. Heraeus Gmbh | Electrical switching contact |
US4117291A (en) * | 1977-05-19 | 1978-09-26 | Gte Automatic Electric Laboratories Incorporated | Reed switch |
US4607148A (en) * | 1985-08-08 | 1986-08-19 | General Electric Company | Change of state contact material for electric circuit interrupters |
US5325079A (en) * | 1993-01-21 | 1994-06-28 | Kaloust P. Sogoian | Electromagnetic relay with integral contacts |
US20080258852A1 (en) * | 2007-04-18 | 2008-10-23 | Key Safety Systems, Inc. | Reed switch contact coating |
US7564330B2 (en) | 2007-04-18 | 2009-07-21 | Key Safety Systems, Inc. | Reed switch contact coating |
Also Published As
Publication number | Publication date |
---|---|
ATA371574A (de) | 1975-04-15 |
GB1449083A (en) | 1976-09-08 |
NL169530C (nl) | 1982-07-16 |
JPS5031359A (de) | 1975-03-27 |
DE2419102C3 (de) | 1981-01-22 |
ES426054A1 (es) | 1976-07-01 |
IT1010437B (it) | 1977-01-10 |
FR2229128B1 (de) | 1977-06-24 |
NL169530B (nl) | 1982-02-16 |
SE387770B (sv) | 1976-09-13 |
AU6864974A (en) | 1975-11-06 |
CH600523A5 (de) | 1978-06-15 |
DE2419102A1 (de) | 1974-11-28 |
AT327311B (de) | 1976-01-26 |
DE2419102B2 (de) | 1980-03-27 |
NL7306445A (de) | 1974-11-12 |
JPS576765B2 (de) | 1982-02-06 |
BE814679A (fr) | 1974-11-07 |
FR2229128A1 (de) | 1974-12-06 |
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