US3889098A - Switching device having contacts of two or more layers - Google Patents

Switching device having contacts of two or more layers Download PDF

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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
Application number
US466713A
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English (en)
Inventor
Anthony Steinmetz
Hidde Walstra
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.)
US Philips Corp
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3889098A publication Critical patent/US3889098A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Thyristors (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
US466713A 1973-05-09 1974-05-03 Switching device having contacts of two or more layers Expired - Lifetime US3889098A (en)

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 (nl)
JP (1) JPS576765B2 (nl)
AT (1) AT327311B (nl)
BE (1) BE814679A (nl)
CH (1) CH600523A5 (nl)
DE (1) DE2419102C3 (nl)
ES (1) ES426054A1 (nl)
FR (1) FR2229128B1 (nl)
GB (1) GB1449083A (nl)
IT (1) IT1010437B (nl)
NL (1) NL169530C (nl)
SE (1) SE387770B (nl)

Cited By (7)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663777A (en) * 1969-08-29 1972-05-16 Philips Corp Reed switch

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663777A (en) * 1969-08-29 1972-05-16 Philips Corp Reed switch

Cited By (8)

* Cited by examiner, † Cited by third party
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
DE2419102A1 (de) 1974-11-28
JPS576765B2 (nl) 1982-02-06
IT1010437B (it) 1977-01-10
ATA371574A (de) 1975-04-15
NL169530B (nl) 1982-02-16
ES426054A1 (es) 1976-07-01
CH600523A5 (nl) 1978-06-15
AU6864974A (en) 1975-11-06
DE2419102C3 (de) 1981-01-22
JPS5031359A (nl) 1975-03-27
NL169530C (nl) 1982-07-16
GB1449083A (en) 1976-09-08
FR2229128B1 (nl) 1977-06-24
FR2229128A1 (nl) 1974-12-06
BE814679A (fr) 1974-11-07
DE2419102B2 (de) 1980-03-27
NL7306445A (nl) 1974-11-12
AT327311B (de) 1976-01-26
SE387770B (sv) 1976-09-13

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