US3656230A - Method of manufacturing magnetic storage elements - Google Patents

Method of manufacturing magnetic storage elements Download PDF

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Publication number
US3656230A
US3656230A US846332A US3656230DA US3656230A US 3656230 A US3656230 A US 3656230A US 846332 A US846332 A US 846332A US 3656230D A US3656230D A US 3656230DA US 3656230 A US3656230 A US 3656230A
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United States
Prior art keywords
plates
magnetic
plate
conductor
magnetic core
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Expired - Lifetime
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US846332A
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English (en)
Inventor
Heimo Hardung-Hardung
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Vickers Zimmer AG
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Vickers Zimmer AG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/255—Magnetic cores made from particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • 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
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49069—Data storage inductor or core

Definitions

  • ABSTRACT A process for the manufacture of a magnetic storage element useful in data processing apparatus.
  • Said element is made by stacking a plurality of plates, made of a non-magnetic, and electrically insulating material, each of which has openings therein so that the openings of the stacked plates together form a recess for receiving a magnetic core.
  • Some of the stacked plates have electrical conductors formed thereon by a printing method.
  • the magnetic core is formed in situ in the stacked plates by solidifying a fluid mixture containing a magnetic material and a resinous binder within the recess.
  • This invention relates to a process for the production of a magnetic information storage element for data processing apparatus, consisting of a carrier body made of a nonmagnetic, electrically insulating material and provided with a hollow space in the form of a magnetic core and at least one electric conductor which penetrates the magnetic core and which is produced by a printing process.
  • the essential constructional parts of a magnetic storage element are the magnetic core and at least one electric conductor. It is in the nature of the matter that the conductor must penetrate the magnetic core.
  • the production of such a system is, in the case of individual storage elements, relatively uncomplicated.
  • matrices with a large number of magnetic cores were assembled by hand; namely, the windings in the form of electric conductors were threaded through the cores, whereupon these were secured in the readied matrix.
  • Such a type of assembling has become more and more time consuming and uneconomical, since arrangements are demanded with higher and higher capacity and an increasing number of cores.
  • each core has at least three windings coupled inductively with the core, namely, a line or row winding, a column winding and a reading winding.
  • 1,040,140 it is a known practice to produce a matrix consisting of a plurality of ferromagnetic cores by embedding finished magnetic cores in depressions of an assembly plate and fixing them there by a casing composition, and subsequently carrying out the wiring on both sides of the assembly plate on past the cores and through one or more holes pro vided in its middle, for example, with a printing process.
  • German Pat. No. 1,025,651 discloses a polydimensional magnetic core storer, in which the carrying body or the assembly plate for the magnetic cores consists of several layers of a nonmagnetic material or insulating material.
  • the individuallayers have perforations with equal division, but differing dimensions, the middle layer serving for the reception of the finished magnetic cores lying in a plane with it.
  • German Pat. No. 1,035,8l0 it is also a known practice to form in situ the individual ferrites in the place of their use, i.e., at the crossing points of the electrical conductors of a matrix, by applying; drops of a paste which consists of magnetic powder and binders. The drops, together with the matrix are subsequently heated, as is normally done for the production of sintered ferrites.
  • the solution of the problem posed is achieved according to the invention by the means that the hollow space of the carrying body is filled with a fluid mixture of a magnetic powder and a solidifying'binder, in which the mixture first surrounds the electric conductor or conductors and subsequently hardens.
  • the carrying body serves as casting mold for the fluid composition forming the magnetic core. Consequently, through the preferably mechanical production of the hollow space inside the carrying body there can be maintained the closest tolerances for the forming magnetic cores.
  • the carrying body with a printed circuit in the final state before the introduction of the fluid composition, since the fluid composition is capable of flowing around the electrical conductors and that part of the carrying body which serves in the zone of the hollow space for the support of the electrical conductor and forming a jointless core.
  • the carrier body be composed of several pierced plates, at least one of the plates on at least one side is provided, by a printing process, with an electrical conductor.
  • the openings on these plates possess such a form, size, position and number that after the placing one upon another of a corresponding number and type of plates in the carrying body there is formed an annular hollow space laying perpendicular to its plane, which space is subsequently filled with the fluid magnetic powder-binder mixture, whereupon this is caused to harden.
  • the multilayer construction of the carrier body permits a very great breadth of variation in the.type of execution of the storage elements.
  • the plates serving exclusively for the insulation of the electric conductors among one another or with respect to the magnetic core can be in the form of sheets or films.
  • storage elements of the type described are not used singly, but are jointed into a matrix with a large number of magnetic cores.
  • plates for the construction of the carrying body which are provided with a large number of openings for a corresponding number of magnetic cores.
  • the openings can be produced, for example, all in a single operation by a punch tool with a large number of stamp dies.
  • the process of the invention is especially well suited to the assembly-line type of production method, e.g., by the use of endless belts.
  • the plates may be first appropriately printed with electrical conductors, continuously perforated and, by means of an adhesive composition, continuously united with one another, whereupon they are filled with the fluid magnetic core composition and subsequently cut up into strips with the desired dimensions.
  • the calibration can be accomplished in an extremely simple manner by a material-removing operation, for example, by grinding.
  • FIG. 1a to 1e show plan views of the individual plates of the carrying body, in part with printed conductor parts
  • FIG. 1f shows the plates according to FIGS. 1a to 1e, which are stacked or placed one upon another in the sequence of the alphabet in figures;
  • FIG. 2 shows a section through the storage element of FIG. 1 f along the line A-A;
  • FIG. 3 shows a section through a storage core matrix, in which the section plane lies in the plane of the reading wire.
  • FIG. 1a there is designated by the numeral 1 a plate such as is used as the upper and lower cover plate for a storage element.
  • the plate 1 has a square form as well as a rectangular recess 2, whose surface configuration corresponds to the projection of the storage core on a plane perpendicular to the plane of the storage core, and whose longitudinal axis coincides with a diagonal of the square.
  • FIG. lb there is designated with the numeral 3 a plate which is arranged between the upper and lower cover plate according to FIG. 1a. It contains two recesses 4 and 5 of such a spatial-position and such dimensions as to correspond to the cross section through the center of gravity of the magnetic core.
  • FIG. 10 shows a plate 6 which has the same outline as the plate according to FIG. lb, but with the difference that besides the recesses 4 and 5 there is present a printed-on electric conductor 7, which runs in the plate center and parallel to two edges of the square plate 6. Consequently, there lies between the axis of symmetry through the two recesses 4 and 5 and the printed-on conductor 7 an angle of 45.
  • FIG. 10 shows a plate 6 which has the same outline as the plate according to FIG. lb, but with the difference that besides the recesses 4 and 5 there is present a printed-on electric conductor 7, which runs in the plate center and parallel to two edges of the square plate 6. Consequently, there lies between the axis of symmetry through the two recesses 4 and 5 and the printed-on conductor 7 an angle of 45.
  • FIG. 10 shows a plate 6 which has the same outline as the plate according to FIG. lb, but with the difference that besides the recesses 4 and 5 there is present a printed-on electric conduct
  • FIG. 1d shows a plate 8 of the same outline as FIG. lb, but in which there is printed electric conductor 9 which runs in the direction of the diagonal which stands at a right angle to the axis of symmetry through the two recesses 4 and 5.
  • FIG. le shows a plate 10 of congruent outline, in which there is printed an electric conductor 11, which lies in plate center and parallel to two edges of the square plate, but, in comparison to the conductor 7 according to FIG. 10, offset by The plates are assembled according to the following sequence, the plates being identified by the above figure numbers and the upper plate being designated first: FIG. la, FIG. 1b, FIG. 1c, FIG. 1d, FIG.le and FIG. 1a.
  • FIG. 1f shows a plane view of the plate stack which forms the carrying body, in which the electric conductors 7, 9 and 11, not visible from above, are represented by broken lines.
  • the conductor 7 presents the so-called column winding, the conductor 9 the socalled reading winding, and the conductor 11 the row winding. All the conductors have a common crossing point 12, at which they are insulated and separated from one another by the plate thickness in each case and lie spatially one over another.
  • the hollow space 13 is filled with a flowable mixture of a magnetic powder and a binder, which is preferably solidifiable at room temperature.
  • a flowable mixture of a magnetic powder and a binder which is preferably solidifiable at room temperature.
  • a binder which is preferably solidifiable at room temperature.
  • Suitable for this is a mixture of carbonyl iron powder, whose average particle size does not appreciably exceed 5 [L in diameter, and an unsaturated polyester resin.
  • Such a mixture can be advantageously produced in a mixing ratio of resin to carbonyl iron powder of 1:6 (parts by weight). Larger amounts of resin constituents may be used.
  • the limit of fluidity lies at about a weight ratio of 1:7.
  • an unsaturated polyester resin for example Polyleit D 4230 of ReicholdChemie, Hamburg
  • carbonyl iron powder for example Polyleit D 4230 of ReicholdChemie, Hamburg
  • Mixtures successfully usable for the purpose of the invention can also be prepared with phenol casting resins, in which case a filling of these resins is possible up to a resin-iron weight ratio of 1:5 and can lie, preferably, between about 1:3 and 1:4.
  • phenol resin for example, Plyophen 62-061 of Reichold-Chemie, Hamburg
  • carbonyl iron powder in the weight ratio of 1:5 hardens completely at temperatures between 80 and within 3 to 5 hours.
  • Suitable binders for the execution of the process of the invention are liquid or liquefiable plastics which can be filled sufficiently with a magnetic powder and then be solidified.
  • Suitable binders are epoxide resins.
  • liquid condensation products of amines for example, of aniline, or of urea, thiourea with aldehydes.
  • the therrnoplasts such as polystyrene, polyamides as well as acryl compounds, may also be used.
  • the magnetic powder after thoroughly grinding is intimately mixed with the binder and then, preferably immediately, put into the hollow spaces in the carrying body.
  • the plane of the magnetic core lies, in consequence of the construction of the carrying body of several layers or plates of the type described, perpendicular to the plane of the carrying body. Consequently, the magnetic core is penetrated by the electrical conductors printed on the individual plates in planes which likewise lie perpendicular to the magnetic core. It is unnecessary, accordingly, to crop or offset the printed conductors in any manner. It is under some circumstances even superfluous to cement the individual layers of the carrying body together before the casting with the magnetic powder-binder mixture, since this mixture itself acts as a binding member in consequence of its adhesive properties and is in annular form enclosing the plate cross pieces between the openings 4 and 5.
  • FIG. 3 shows a cross section through a storage core matrix which has arisen through combining of several storage elements according to FIGS. 1 and 2.
  • the carrying body is likewise composed of several layers or plates, of which, however, only one, 14, is visible.
  • the carrying body contains sixteen magnetic cores 15, whose planes likewise lie perpendicular to the plane of the carrying body and, further, are aligned at an angle of 45 to the outer edges of the carrying body.
  • the numeral 16 designates the column windings, and numeral 17 the row windings, each of which penetrates four magnetic cores in a straight line, but in different planes. In another plane or on another plate there is the printed reading winding 18, going through all the magnetic cores in a meander pattern.
  • a process for the manufacture of a magnetic storage element for use in data processing apparatus which comprises:
  • a process for the manufacture of a magnetic storage element for use in data processing apparatus which comprises:

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Soft Magnetic Materials (AREA)
  • Magnetic Heads (AREA)
US846332A 1968-08-09 1969-07-31 Method of manufacturing magnetic storage elements Expired - Lifetime US3656230A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681764812 DE1764812A1 (de) 1968-08-09 1968-08-09 Verfahren zur Herstellung eines magnetischen Speicherelements

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US3656230A true US3656230A (en) 1972-04-18

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US (1) US3656230A (enrdf_load_stackoverflow)
DE (1) DE1764812A1 (enrdf_load_stackoverflow)
GB (1) GB1266369A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4866244A (en) 1987-08-27 1989-09-12 Carl-Zeiss-Stiftung Arrangement for machining a workpiece by means of a laser beam
US4942284A (en) * 1988-02-24 1990-07-17 Lectra Systemes Laser cutting apparatus provided with a gas evacuation device
US20080134835A1 (en) * 2005-03-11 2008-06-12 Hoganas Ab Metal Powder Composition Comprising A Drying Oil Binder
US20090072942A1 (en) * 2007-09-19 2009-03-19 Industrial Technology Research Institute Meander inductor and substrate structure with the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100420541B1 (ko) * 1998-12-07 2004-03-02 스미토모 긴조쿠 고잔 가부시키가이샤 수지 결합형 자석

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2506604A (en) * 1947-02-01 1950-05-09 Robert P Lokker Method of making electronic coils
US3138785A (en) * 1959-05-21 1964-06-23 Ibm Deposited magnetic memory array
US3154840A (en) * 1960-06-06 1964-11-03 Rca Corp Method of making a magnetic memory
US3247572A (en) * 1962-05-17 1966-04-26 Bell Telephone Labor Inc Method for obtaining smooth winding surfaces on rough miniature cores
US3492665A (en) * 1960-08-24 1970-01-27 Automatic Elect Lab Magnetic device using printed circuits

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2506604A (en) * 1947-02-01 1950-05-09 Robert P Lokker Method of making electronic coils
US3138785A (en) * 1959-05-21 1964-06-23 Ibm Deposited magnetic memory array
US3154840A (en) * 1960-06-06 1964-11-03 Rca Corp Method of making a magnetic memory
US3492665A (en) * 1960-08-24 1970-01-27 Automatic Elect Lab Magnetic device using printed circuits
US3247572A (en) * 1962-05-17 1966-04-26 Bell Telephone Labor Inc Method for obtaining smooth winding surfaces on rough miniature cores

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4866244A (en) 1987-08-27 1989-09-12 Carl-Zeiss-Stiftung Arrangement for machining a workpiece by means of a laser beam
US4942284A (en) * 1988-02-24 1990-07-17 Lectra Systemes Laser cutting apparatus provided with a gas evacuation device
US20080134835A1 (en) * 2005-03-11 2008-06-12 Hoganas Ab Metal Powder Composition Comprising A Drying Oil Binder
US7815707B2 (en) 2005-03-11 2010-10-19 Höganäs Ab Metal powder composition comprising a drying oil binder
CN101137455B (zh) * 2005-03-11 2010-12-08 霍加纳斯股份有限公司 包含干性油粘合剂的金属粉末组合物
US20090072942A1 (en) * 2007-09-19 2009-03-19 Industrial Technology Research Institute Meander inductor and substrate structure with the same
US7932802B2 (en) * 2007-09-19 2011-04-26 Industrial Technology Research Institute Meander inductor and substrate structure with the same

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DE1764812A1 (de) 1971-11-11
GB1266369A (enrdf_load_stackoverflow) 1972-03-08

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