EP0217219B1 - Miniaturinduktionsspule und ihr Herstellungsverfahren - Google Patents

Miniaturinduktionsspule und ihr Herstellungsverfahren Download PDF

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Publication number
EP0217219B1
EP0217219B1 EP86112759A EP86112759A EP0217219B1 EP 0217219 B1 EP0217219 B1 EP 0217219B1 EP 86112759 A EP86112759 A EP 86112759A EP 86112759 A EP86112759 A EP 86112759A EP 0217219 B1 EP0217219 B1 EP 0217219B1
Authority
EP
European Patent Office
Prior art keywords
skids
metal strip
cover
central opening
support
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
EP86112759A
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English (en)
French (fr)
Other versions
EP0217219A1 (de
Inventor
Guy Barbier
Jean-Paul Amory
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 CIT SA
Original Assignee
Alcatel CIT SA
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 Alcatel CIT SA filed Critical Alcatel CIT SA
Publication of EP0217219A1 publication Critical patent/EP0217219A1/de
Application granted granted Critical
Publication of EP0217219B1 publication Critical patent/EP0217219B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01F27/02—Casings
    • H01F27/027—Casings specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
    • 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
    • H01F41/005—Impregnating or encapsulating
    • 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
    • H01F41/04—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 for manufacturing coils
    • H01F41/10—Connecting leads to windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F2017/048—Fixed inductances of the signal type  with magnetic core with encapsulating core, e.g. made of resin and magnetic powder
    • 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
    • Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling
    • 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
    • Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core
    • 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
    • Y10T29/49799—Providing transitory integral holding or handling portion

Definitions

  • the present invention relates to a miniature electronic component having an adjustable inductance consisting of a winding associated with a ferromagnetic plunger core whose penetration depth is adjustable.
  • this kind of miniature inductance sometimes has surface defects: small craters due to air bubbles trapped along the walls of the mold during the pouring of the resin or undesirable bosses due to the deterioration of the flexible mold. These surface defects in addition to the fact that they are unsightly can adversely affect the quality of the component because they can cause pockets of retention for the corrosive products of the solder flux used during the mounting of the component.
  • the object of the present invention is to remedy these various drawbacks while retaining a low cost price.
  • a miniature inductance formed by a winding welded to a pair of connection pads, a ferromagnetic plunger core threaded at least in part and a cover made of pressure-molded plastic material having two opposite side walls on the edge of which the connection pads are stapled, which are traversed by a central orifice serving as housing for the plunger core and which are separated by a solid part in which said orifice is tapped in a manner complementary to the thread of the plunger core and by a hollow part in which said winding is arranged in the axis of said orifice and embedded in a resin.
  • the miniature inductance in the form of a rectangular parallelepiped. It comprises a cover 1 carrying connection pads 2, 3 and enclosing a cylindrical winding 4 embedded in resin and provided with a plunger core 5.
  • the cover 1 has the general shape of a hollow die opened by its bottom. It has two opposite side walls 6, 7 which bear on their edge the connection pads 2, 3 and which are traversed right through by a central orifice serving as housing for the plunger core 5. These two side walls 6, 7 are separated by a solid part 8 of the cover in which the central orifice is provided with a thread 9 and by a hollow part 10 which serves as a housing for the cylindrical winding 4 centered on the central orifice.
  • Grooves 11, 12, 13 formed around the solid part 8, along the side walls of the cover 1 allow the fitting of a connection pad 3 on the edge of the side wall 6 adjacent to the solid part 8 as well as the housing for the electrical connection of the winding 4 to this pad 3 and the supply of resin from the hollow part to reinforce the fixing of this pad 3.
  • connection pads 2, 3 are identical. Their shape appears more clearly in Figures 2 and 3. Each of them consists of a metal tongue folded longitudinally in a U shape with two wings approximately the same height 15, 16 joined by a base 17 placed astride a ledge of the hood wall. One of the wings, 15, coming outside the hood, has a rectangular profile started in the middle by a large rounded notch 18 ensuring the release of the central orifice serving as housing for the plunger core.
  • the other wing, 16 has two tabs 19, 20 with a dovetail profile which come inside the cover and serve to anchor the pad in the plastic coating material and one of which, 19 , is extended on the side of a folded finger 21 used for fixing one end of the winding 4.
  • the plunger core 5 shown in FIG. 1 consists of a ferromagnetic rod 24 provided with a threaded head 25 adapted to the internal thread 9 of the central orifice and hollowed out with a diametrical actuation slot 26.
  • the adjustable miniature inductor which has just been described connects to the tracks of a printed circuit or of a hybrid circuit on ceramic wafer in the manner of small electronic components appearing in the form of a block with connection terminals embedded in their side faces that is to say, either by forming a weld fillet to the surfaces in contact with its connection pads or by placing spacer parts therein.
  • connection pads are produced in pairs from a cut and folded metal strip.
  • This strip is for example a 0.1 mm thick copper strip cut by a photoengraving technique, tinned by an electrolytic technique and then folded.
  • FIG. 2 represents such a strip after cutting and before folding.
  • Several pairs of pads are cut from this strip and separated by centering clips 30. Within each pair, the pads are constituted by bridges thrown through openings 31 and placed face to face in the width direction. the strip, at their final distance. These bridges are attached to the edges of the openings 31 by throttles 32, 33 facilitating their subsequent separation.
  • the covers with their central orifice tapped in the solid part, are obtained by injection molding of a thermosetting plastic material such as for example diallylphthalate in a rigid mold designed in several parts and polished internally in the direction of extraction of the part made to facilitate demolding.
  • a thermosetting plastic material such as for example diallylphthalate
  • This die casting technique eliminates appearance defects, blistering and cra tées, thanks to the rigidity of the mold and the good evacuation of the air included in the mold made possible by the injection pressure. In addition, it does not use a mold release agent.
  • the assembly of the miniature inductors begins by welding the ends of the windings 4 to the fingers 21 of the pairs of pads still attached to their original metal edge which temporarily keeps them in correct positioning.
  • the windings 4 are oriented parallel to the width of the metal strip.
  • One of their ends 35 is not arched, it escapes tangentially and arrives perpendicularly to the finger 21 of one of the connecting pads 2 while their other end 36 is arched parallel to their axis after having escaped tangentially and arrives in the axis of the finger 21 of the other connection pad 3.
  • This arrangement allows the winding of one of the pads to be brought closer so that it is facing the hollow part of the cover and leaves relative to the other shoe sufficient space to accommodate the solid part 8 of the cover supporting the thread in which the plunger core is screwed.
  • a rigid, elongated hood support This, shown in Figure 4, has a series of housings 40 aligned with the same spacing as the pairs of connecting pads on the metal strip and centering pins 41 having the same relative arrangement as the centering clips 30 of the metal strip.
  • Each housing 40 is designed to receive a cover 1 arranged upside down, its central orifice oriented in the width direction of the support, and has in its side walls a hole 42 centered on the central orifice of the cover allowing the introduction a pin 43 saving the clearance space of the plunger core.
  • This pin 43 has a smooth end rod 44 extending through a shoulder a threaded portion 45 of larger diameter suitable for tapping 9 of the covers, itself followed by a non-threaded portion 46 ending in a gripping head 47.
  • the covers 1, produced by injection molding, are arranged upside down in the housings 40, their central orifice in the extension of the hole 42 of the support.
  • the metal strip with the pairs of connection pads fitted with their windings is then brought opposite the support and then lowered so that the windings 4 penetrate into the hollow parts of the covers 1 and that the pads are fitted on the edges of the side walls of the covers, the precise positioning resulting from the guidance of the end chamfers of the centering pins 41 of the support in the centering clips 30 of the metal strip.
  • the pins 43 are introduced into the openings 42 of the support by screwing them into the threads 9 of the covers to save the clearance space of the plunger cores inside the windings 4 then the hollow part of the covers is filled with a thermosetting plastic coating material which bypasses by grooves 11, 12, 13 the solid part 8 of the cover and reaches the base of the connection pads embedding their anchoring lugs and penetrating by cappillarity between them and the wall of the hood.
  • the pins 43 are removed, the metal strip unclipped from the cover support and the miniature inductors come out of their housing, separated from the metal strip and equipped with their plunger cores.

Claims (4)

1. Einstellbare Miniaturinduktanz, bestehend aus einer an ein Paar von Anschlußspangen (2, 3) angeschweißten Wicklung (4) und einem ferromagnetischen, mindestens teilweise mit einem Gewinde versehenen Tauchkern (5), dadurch gekennzeichnet, daß sie weiter eine durch Spritzguß gefertigte Kunststoffkappe (1) in Form eines hohlen Würfels mit zwei einander gegenüberliegenden Seiten (6,7) aufweist, an deren Kanten die Anschlußspangen angeklammert sind, wobei die Seiten von einer zentralen Öffnung zur Aufnahme des Tauchkerns (5) durchdrungen und durch einen massiven Abschnitt (8), in welchem die zentrale Öffnung mit einem an das Gewinde des Tauchkörpers (5) angepaßten Gewinde (9) versehen ist, sowie durch einen hohlen Abschnitt (10) voneinander getrennt sind, in welchem die Wicklung (4) in der Achse der zentralen Öffnung angeordnet und in ein Harz eingebettet ist.
2. Induktanz nach Anspruch 1, dadurch gekennzeichnet, daß der massive Abschnitt (8) der Kappe (1) durch seitliche Kehlen (11, 12, 13) von den Seitenwänden der Kappe (1) getrennt ist, die ein Aufstecken einer Anschlußspange (3) auf die Kante der dem massiven Abschnitt benachbarten Seitenwand (6), die Unterbringung des elektrischen Anschlusses zwischen der Wicklung (4) und der Anschlußspange (3) und das Einbringen von Harz vom hohlen Abschnitt (10) aus zur Verstärkung der Befestigung der genannten Anschlußspange (3) erlauben.
3. Induktanz nach Anspruch 1, dadurch gekennzeichnet, daß die Anschlußspangen (2, 3) schwalbenschwanzförmige Laschen (19, 20) besitzen, die zu ihrer Verankerung im Einbettungsharz dienen.
4. Verfahren zur Herstellung einer Induktanz nach Anspruch 1, bei dem:
unter Hießluft auf provisorische Dorne Wicklungen (4) aus leitendem Draht, die mit wärmehaftender Isolation versehen sind, aufgewickelt werden, worauf die provisorischen Dorne herausgezogen werden,
die Enden (35, 36) der Wicklungen (4) verzinnt und umgebogen werden,
und Tauchkerne durch Angießen eines Gewindes an eines der Enden von ferromagnetischen Stäben (24) mit kleinerem Durchmesser als dem der Wicklungen hergestellt werden, dadurch gekennzeichnet, daß das Verfahren weiter aus folgenden Schritten besteht.
Herstellen von Paaren von Anschlußspangen (2, 3) durch Ausstanzen eines Metallbandes ohne Abtrennen vom Band, wobei sich die Spangen eines Paars an zwei entgegengesetzten Rändern des Bandes einander in ihrem endgütligen Abstand gegenüberstehen und die Paare über das Band durch Zentrierklips (30) voneinander getrennt sind,
Herstellen der durch Spritzguß gefertigten Kunststoffkappen in Form eines hohlen Würfels mit zwei einander gegenüberliegenden Wänden (6, 7) desselben Abstands wie dem der Spangen (2, 3) eines Paars auf dem Metallband, wobei die Wände von einer zentralen Öffnung mit den Abmessungen des Tauchkerns (5) durchdrungen und durch einen massiven Abschnitt (8), in welchem die zentrale Öffnung komplementär zum Gewinde der Tauchkerne (5) mit einem Gewinde versehen ist, sowie durch einen hohlen Abschnitt (10) voneinander getrennt sind, der es ermöglicht, eine Wicklung (4) in der Achse der zentralen Öffnung unterzubringen, wobei der Massive Abschnitt (8) von den Seitenwänden der Kappe (1) durch Kehlen (11, 12, 13) getrennt ist, welche die Ränder von den Wänden absetzen,
Anbringen der Wicklungen (4) auf den Paaren der Anschlußspangen des Metallbands in Breitenrichtung des Bands gesehen, und zwar durch Anschweißen ihrer Enden an denselben,
Einsetzen der Kappen (1) in einen Träger mit der gleichen länglichen Form wie das Metallband und mit einer Reihe von Aufnahmemulden (40) für Kappen, die wie die Paare der Spangen über das Metallband distanziert und durch Zentrierstifte (41) gleicher relativer Verteilung wie die Zentrierklips (30) des Metallbands voneinander getrennt sind, wobei jede Kappe (1) bei senkrecht zur Länge des Trägers verlaufender zentraler Öffnung mit dem Kopf nach unten angeordnet ist, Einführen der an den Paaren der Spangen des Metallbands befestigten Wicklungen (4) in die hohlen Abschnitte (10) der im Träger angeordneten Kappen (1) unter Beachtung der richtigen Positionierung der Stifte (41) in den Klips (30),
Anbringen eines Doms (43) im Inneren der Mulden (40) des Trägers durch eine seitliche, in der Achse der zentralen Öffnung der Kappen eingebrachten Bohrung (42), wobei der Dorn so geformt ist, daß er das Bewegungsspiel für den Tauchkern berücksichtigt,
Füllen des hohlen Abschnitts (10) jeder Kappe (1) mit einem Einbettungsharz,
Herausziehen der Dorne (43) nach dem Aushärten des Einbettungsharzes,
Herausziehen der Kappen (1) aus dem Träger,
Ablösen der Anschlußspangen vom Metallband, und
Montieren der Tauchkerne in die von den Dornen freigelassenen Öffnungen.
EP86112759A 1985-09-19 1986-09-16 Miniaturinduktionsspule und ihr Herstellungsverfahren Expired - Lifetime EP0217219B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8513918A FR2587537B1 (fr) 1985-09-19 1985-09-19 Inductance miniature et son procede de fabrication
FR8513918 1985-09-19

Publications (2)

Publication Number Publication Date
EP0217219A1 EP0217219A1 (de) 1987-04-08
EP0217219B1 true EP0217219B1 (de) 1991-01-02

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Application Number Title Priority Date Filing Date
EP86112759A Expired - Lifetime EP0217219B1 (de) 1985-09-19 1986-09-16 Miniaturinduktionsspule und ihr Herstellungsverfahren

Country Status (8)

Country Link
US (2) US4706058A (de)
EP (1) EP0217219B1 (de)
CN (1) CN1006745B (de)
BR (1) BR8604468A (de)
DE (1) DE3676407D1 (de)
FR (1) FR2587537B1 (de)
IN (1) IN166417B (de)
MX (1) MX168164B (de)

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Publication number Priority date Publication date Assignee Title
US5307557A (en) * 1992-04-14 1994-05-03 Chilisin Electronics Corporation Method of manufacturing a chip inductor with ceramic enclosure
JP3197606B2 (ja) * 1992-05-07 2001-08-13 ティーディーケイ株式会社 インダクタンス可変型コイル装置
CA2180992C (en) * 1995-07-18 1999-05-18 Timothy M. Shafer High current, low profile inductor and method for making same
US7921546B2 (en) 1995-07-18 2011-04-12 Vishay Dale Electronics, Inc. Method for making a high current low profile inductor
JP3449222B2 (ja) * 1998-06-23 2003-09-22 株式会社村田製作所 ビーズインダクタの製造方法及びビーズインダクタ
US6973711B1 (en) * 2000-05-24 2005-12-13 Fonar Corporation Method for making pieces for a magnetic resonance imaging magnet
US8943675B2 (en) * 2011-02-26 2015-02-03 Superworld Electronics Co., Ltd. Method for making a shielded inductor involving an injection-molding technique
CN102610365A (zh) * 2011-07-19 2012-07-25 深圳市研通高频技术有限公司 可变电感器
CN102752028B (zh) * 2012-07-11 2014-08-27 浙江方大智控科技有限公司 一种电力载波的无源选频放大接收器
CN102789877A (zh) * 2012-07-30 2012-11-21 昆山达功电子有限公司 一种微型电感器
CN104425099A (zh) * 2013-09-05 2015-03-18 重庆美桀电子科技有限公司 组装式电感元件及其制法
JP2016187364A (ja) * 2013-09-20 2016-11-04 第一高周波工業株式会社 磁束照射装置
JP6332073B2 (ja) * 2015-02-13 2018-05-30 株式会社村田製作所 コイル部品
JP6515642B2 (ja) * 2015-04-02 2019-05-22 スミダコーポレーション株式会社 コイル部品の製造方法およびコイル部品の製造に用いられる治具
DE102019209141A1 (de) * 2019-06-25 2020-12-31 Mahle International Gmbh Verfahren zur Herstellung einer induktiven Ladeeinrichtung
CN110660569B (zh) * 2019-08-29 2021-06-04 合肥博雷电气有限公司 一种同轴结构的脉冲成形电感器及其加工方法

Citations (1)

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Publication number Priority date Publication date Assignee Title
FR2486704A1 (fr) * 1980-07-09 1982-01-15 Cit Alcatel Procede de fabrication d'une inductance miniature ajustable et inductance ainsi obtenue

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US3824518A (en) * 1973-03-05 1974-07-16 Piconics Inc Miniaturized inductive component
FR2314046A1 (fr) * 1975-06-10 1977-01-07 Cit Alcatel Moule pour realisation de manchon en plastique surmoule autour d'une piece
DE2617465C3 (de) * 1976-04-21 1978-10-19 Siemens Ag, 1000 Berlin Und 8000 Muenchen Elektrische Spule und Verfahren zu ihrer Herstellung
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Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
FR2486704A1 (fr) * 1980-07-09 1982-01-15 Cit Alcatel Procede de fabrication d'une inductance miniature ajustable et inductance ainsi obtenue

Also Published As

Publication number Publication date
IN166417B (de) 1990-05-05
FR2587537A1 (fr) 1987-03-20
MX168164B (es) 1993-05-07
FR2587537B1 (fr) 1987-10-30
CN1006745B (zh) 1990-02-07
DE3676407D1 (de) 1991-02-07
BR8604468A (pt) 1987-05-19
US4736513A (en) 1988-04-12
US4706058A (en) 1987-11-10
CN86106038A (zh) 1987-03-18
EP0217219A1 (de) 1987-04-08

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