US3869687A - Bistable crosspoint matrix - Google Patents

Bistable crosspoint matrix Download PDF

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Publication number
US3869687A
US3869687A US418643A US41864373A US3869687A US 3869687 A US3869687 A US 3869687A US 418643 A US418643 A US 418643A US 41864373 A US41864373 A US 41864373A US 3869687 A US3869687 A US 3869687A
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US
United States
Prior art keywords
matrix
permanent magnets
crosspoint
cover sheet
columns
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
US418643A
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English (en)
Inventor
Walter Hoffmann
Hans-Dieter Pfeil
Wolfgang Mecklenberg
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.)
Alcatel Lucent NV
Original Assignee
International Standard Electric 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
Priority claimed from DE19722260002 external-priority patent/DE2260002C3/de
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US3869687A publication Critical patent/US3869687A/en
Assigned to ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTERDAM, THE NETHERLANDS, A CORP OF THE NETHERLANDS reassignment ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTERDAM, THE NETHERLANDS, A CORP OF THE NETHERLANDS ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL STANDARD ELECTRIC CORPORATION, A CORP OF DE
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
    • H01H67/00—Electrically-operated selector switches
    • H01H67/22—Switches without multi-position wipers
    • H01H67/32—Switches without multi-position wipers having a multiplicity of interdependent armatures operated in succession by a single coil and each controlling one contact or set of contacts, e.g. counting relay
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H67/00—Electrically-operated selector switches
    • H01H67/22—Switches without multi-position wipers
    • H01H67/24—Co-ordinate-type relay switches having an individual electromagnet at each cross-point

Definitions

  • the cover sheet has a particular design which completely covers the crosspoints near the center of the matrix and only partially covers the crosspoints near the edges of the matrix. The crosspoints at the corners are not covered at all. The differences in the pickup and dropout values between the center, edge, and corner crosspoints is thereby eliminated.
  • the present invention relates to a matrix with bistable crosspoint devices arranged in rows and columns, each of which is associatedwith a coil and a permanent magnet.
  • An electric contact particularly designed for use in such crosspoint devices is described in a copending application by W. Mecklenburg et al. Ser. No. 417,984 filed Nov. 21, 1973, entitled Magnetically Actuated Sealed Contact, assigned to the assignee of the present invention.
  • a crosspoint relay for the purpose of this invention, comprises an electromagnetically actuated contact wired in a'crosspoint switching configuration or matrix.
  • a crosspoint matrix therefore consists of an ordered array of a plurality of contacts having an equal number of rows and columns and wired in a crosspoint switching configuration.
  • the term crosspoint hereinafter refers to a crosspoint relay, and the term crosspoint matrix refers to a matrix array of crosspoint relays.
  • the stray magnetic fields of the permanent magnets will influence the pickup and dropout values of the individual crosspoints to different extents.
  • the static pickup and dropout values of the individual crosspoint contacts are displaced due to the influence of stray magnetic fields.
  • the displacement of these static values of the crosspoints is less than that of the crosspoints arranged in the center of the matrix and which are on all sides surrounded by neighbors. This uneven distribution in the pickup and dropout values can be detrimental in the crosspoint matrix since the electric current used to energize the electromagnetic relays is the same for all the relays within the matrix.
  • this is accomplished by arranging a common cover sheet to completely cover the permanent magnets of the crosspoints arranged in the center of the matrix, and to partly cover the permanent magnets of the crosspoints arranged at the edges and corners of the matrix.
  • the cover sheet is made from a material which is capable of shunting the magnetic fields of the neighboring permanent magnets and is arranged to lay parallel with the plane of the magnetization axes of the permanent magnets.
  • the cover sheet covers half of the permanent magnets of the crosspoints arranged at the edges of the matrix, while the permanent magnets of the crosspoints arranged at the corners of the matrix are not covered by the cover sheet at all so that the magnetic field of the permanent magnets are shunted to a greater extent near the center of the matrix than at the edges and corners thereof.
  • the permanent magnets as associated with the crosspoints in the rows are polarized in the same sense, while those in the columns are polarized in the opposite sense.
  • FIG. 1 is a diagramatic view ofa matrix with 8 times 8 crosspoint relays showing the position of the cover sheet relative to the matrix;
  • FIG. 2 is a graphic representation of the pickup and dropout values of the crosspoint relays of a matrix without a cover sheet as compared to the value of an individual crosspoint relay;
  • FIG. 3 is a graphic representation of the pickup and dropout values of the crosspoint relays of a matrix as compared to an individual crosspoint relay with a cover sheet covering all of the crosspoints;
  • FIG. 4 is a graphic representation of the pickup and dropout values of the crosspoint relays of a matrix relative to an individual crosspoint relay with a cover sheet covering a part of the crosspoint relays according to the invention.
  • FIG. 1 there is shown a matrix with 8 times 8 bistable crosspoints arranged in rows and columns, with the crosspoints arranged in the center of the matrix being indicated by the reference numeral 1 while those arranged at the edges and the corners of the matrix being indicated by the reference numerals 2 and 3 respectively.
  • Each of the crosspoints l, 2, 3 is associated with a permanent magnet and a coil.
  • the permanent magnets of the crosspoints l, 2, 3 in the rows of the matrix are polarized in the same sense, and those in the columns are each polarized in the opposite sense.
  • the axes of magnetization of the permanent magnets are in the same plane; the direction of magnetization is indicated in FIG. 1 by the arrows.
  • a common cover sheet 4 is so designed as to completely cover the permanent magnets associated with the crosspoints 1 arranged in the center of the matrix, and as to cover only half of the permacorners of the matrix are only partly covered, the magnetic shunt is reduced at these points. This compensates for the difference influence by the stray fields of the neighboring magnets.
  • FIG. 1 the crosspoints arranged in the center are also indicated in FIGS. 2 to 4 by the reference numeral 1 while those arranged at the edges and at the corners are indicated by the reference numerals 2 and 3 respectively. For the sake of compensation there is each time additionally shown the position of an individual crosspoint 5 not arranged in a matrix.
  • FIG. 2 shows the static values relating to a matrixwithout a cover sheet.
  • the magnetic fields of the crosspoints 1 arranged inside (in the center of) the matrix additively combine with each other. This causes an increased magnetic flux through the open contacts.
  • the pickup values of the crosspoints 1 decrease noticeably while the dropout values are shown to increase.
  • the crosspoints 2, arranged along the edges of the matrix show small variations of their values compared to those of an individual crosspoint 5.
  • the values of the crosspoints 3 as arranged at the corner points of the matrix vary still less.
  • FIG. 3 shows the static values relating to a matrix in which all crosspoints are covered by a cover sheet.
  • FIG. 4 shows the values relating to a matrix in which the cover sheet is cut away at the edges and corners as shown in FIG. 1. This further reduces the pickup values of the crosspoints 2 and 3 as arranged at the edges and corners, thus approaching the static-values of the crosspoints 1 arranged in the center of the matrix.
  • a crosspoint matrix of the type having a plurality of electromagnetic relays arranged in rows and columns, each relay including an electromagnetic coil and a permanent magnet, wherein the improvement comprises:
  • a cover sheet in magnetic proximity to said plurality of relays for selectively shunting the magnetic fields of the permanent magnets by partially covering some of the magnets and completely covering the rest of the magnets within said matrix thereby eliminating variations in magnetic forces upon the contacts within said relays.
  • a crosspoint matrix according to claim 2 wherein said cover sheet is superimposed on said permanent magnets to cover half of each permanent magnet along the edges of said matrix and wherein the permanent magnets at the corners of said matrix are uncovered.
  • a crosspoint matrix of the type having a plurality of electromagnetic relays arranged in rows and columns, each relay containing an electromagnet and a permanent magnet
  • the improvement comprises a common cover sheet placed on the permanent magnets parallel with the plane of the magnetization axes of said permanent magnets, said cover sheet entirely covering all the permanent magnets belonging to the interior rows and columns of said matrix, said cover sheet covering onehalf of each permanent magnet belonging to the outer rows and columns of said matrix, the permanent magnets at the corners of said matrix being uncovered, whereby the fields corresponding to said permanent magnets belonging to the interior rows and columns of said matrix are shunted to a greater extent than the fields of said permanent magnets belonging to the outer rows and columns of said matrix, and the fields of said permanent magnets belonging to the outer rows and columns of said matrix are shunted to a greater extent than the perm anent magnets corresponding to the corners of said matrix.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Electromagnets (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
US418643A 1972-12-07 1973-11-23 Bistable crosspoint matrix Expired - Lifetime US3869687A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722260002 DE2260002C3 (de) 1972-12-07 Koppelmatrix für Fernmelde-, insbesondere Fernsprechvermittlungsanlagen

Publications (1)

Publication Number Publication Date
US3869687A true US3869687A (en) 1975-03-04

Family

ID=5863827

Family Applications (1)

Application Number Title Priority Date Filing Date
US418643A Expired - Lifetime US3869687A (en) 1972-12-07 1973-11-23 Bistable crosspoint matrix

Country Status (10)

Country Link
US (1) US3869687A (xx)
JP (1) JPS4997506A (xx)
AT (1) AT336086B (xx)
BE (1) BE808163R (xx)
CH (1) CH579321A5 (xx)
FR (1) FR2209999B1 (xx)
GB (1) GB1420350A (xx)
IT (1) IT1002203B (xx)
NL (1) NL7316336A (xx)
SE (1) SE383939B (xx)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19529974C1 (de) * 1995-08-16 1996-10-24 Krone Ag Koppelfeld

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3061696A (en) * 1958-10-29 1962-10-30 Bell Telephone Labor Inc Switching device
US3439301A (en) * 1966-02-03 1969-04-15 Fujitsu Ltd Electromagnetic switch matrix
US3445728A (en) * 1967-01-03 1969-05-20 Stromberg Carlson Corp Reed relay assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3061696A (en) * 1958-10-29 1962-10-30 Bell Telephone Labor Inc Switching device
US3439301A (en) * 1966-02-03 1969-04-15 Fujitsu Ltd Electromagnetic switch matrix
US3445728A (en) * 1967-01-03 1969-05-20 Stromberg Carlson Corp Reed relay assembly

Also Published As

Publication number Publication date
JPS4997506A (xx) 1974-09-14
ATA997173A (de) 1976-08-15
FR2209999B1 (xx) 1979-08-03
CH579321A5 (xx) 1976-08-31
DE2260002A1 (de) 1974-06-20
AU6315373A (en) 1975-06-05
NL7316336A (xx) 1974-06-11
GB1420350A (en) 1976-01-07
FR2209999A1 (xx) 1974-07-05
SE383939B (sv) 1976-04-05
AT336086B (de) 1977-04-12
DE2260002B2 (de) 1976-01-02
BE808163R (nl) 1974-06-04
IT1002203B (it) 1976-05-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A CORP OF DE;REEL/FRAME:004718/0023

Effective date: 19870311