US3150339A - Coil having heat conductive segments and c-shaped conductive path - Google Patents

Coil having heat conductive segments and c-shaped conductive path Download PDF

Info

Publication number
US3150339A
US3150339A US207707A US20770762A US3150339A US 3150339 A US3150339 A US 3150339A US 207707 A US207707 A US 207707A US 20770762 A US20770762 A US 20770762A US 3150339 A US3150339 A US 3150339A
Authority
US
United States
Prior art keywords
sheet
coil
shaped
conductive path
turns
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
US207707A
Inventor
Alvar P Wilska
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.)
Philips Electronics and Pharmaceutical Industries Corp
Original Assignee
Philips Electronics and Pharmaceutical Industries 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 to BE634473D priority Critical patent/BE634473A/xx
Priority to NL294726D priority patent/NL294726A/xx
Application filed by Philips Electronics and Pharmaceutical Industries Corp filed Critical Philips Electronics and Pharmaceutical Industries Corp
Priority to US207707A priority patent/US3150339A/en
Priority to DEP1268A priority patent/DE1268740B/en
Priority to CH823163A priority patent/CH414858A/en
Priority to GB26758/63A priority patent/GB1043886A/en
Priority to FR940486A priority patent/FR1364871A/en
Application granted granted Critical
Publication of US3150339A publication Critical patent/US3150339A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/64—Magnetic lenses
    • H01J29/66—Magnetic lenses using electromagnetic means only
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
    • H01J23/087—Magnetic focusing arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/02—Details
    • H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
    • H01J37/10—Lenses
    • H01J37/14—Lenses magnetic
    • H01J37/141—Electromagnetic lenses

Definitions

  • This invention relates to an electrical coil for producing a concentrated magnetic field.
  • This invention relates to a coil suitable for use in electron beam focusing devices and not requiring ferromagnetic material to concentrate the magneticeld.
  • the inhomogeneities of a ferromagnetic core structure introduce distortions-in the magnetic field that result in unacceptable distortions of the beam. These inhomogeneities are yat least partly determined by the crystalline structure of the ferromagnetic material and are not systematic and cannot be completely corrected.
  • hysteresis effects in ferromagnetic matevrial makes it ditlicult to control variations in the magnetic intensity to the precise amount that is frequently required.
  • the hysteresis effect results in a nonlinear variation of the magnetic eld, even if the electric current in the associated coil can be varied linearly.
  • the domains of the ferromagnetic particles shift abruptly.
  • the non-linearity is made worse by the fact that ferromagnetic materials become saturated when the magnetic ilux exceeds a certain amount, depending on the volume of ferromagnetic material involved.
  • the present invention comprises a coil capable of producing highly concentrated magnetic elds Without ferromagnetic material.
  • the coil is made up of individual, conductive layers each of which is in the form of a conductive sheet with an almost-closed circuit surrounding an inner non-conductive, or open, space.
  • the edges of the sheet extend outwardly from the circuit and are formed integrally therewith by means of slots extending from the edge of the sheet in toward the circuit. Any number of these layers may be stacked together, but they must be insulated from one another, and also in accordance with the present invention, this insulation may be in the form of a 'thin layer of material, such as evaporated silicon dioxide.
  • a limited area at the end ofthe circuit on one side of the sheet is kept free of insulating material and is covered instead with solder or the like so that the layers may be stacked together and heated simultaneously to cause the solder at one end of each circuit to become attached to the other end of the circuit of the next adjacent layer.
  • FIG. 1 shows a single layer of -a coil constructed according to the invention
  • FIG. 2 shows an enlarged cross-sectional view of the layer in FIG. l taken along the line 2 2;
  • FIG. 3 shows an enlarged cross-sectional view of a. stack of such layers
  • FIG. 4 shows a coil constructed in accordance with FIG. 3 expanded axially.
  • the coil layer in FIG. l comprises a sheet 11, which in this case is a circular sheet of conductive material, such as copper.
  • the sheet may have any desired thickness; in a particular embodiment, I have used a sheet having a thickness of approximately Zmils.
  • the sheet has a C- shaped, conductive path or circuit 12 defined by an open inner area 13 and, less explicitly, by the inner ends of a plurality of slots 14 spaced around the sheet.
  • the slots 14 may be spaced at approximately equal angles, although this is not necessary, .and normally they extend ⁇ approximately radially in toward the center of the area 13.
  • the slots 14 extend only part way from the edge of the sheet 11 toward the open area 13. However, one slot 16 extends all the way in to theopen area to give the conductive path 12 a C-shaped configuration so that it will not be self shortcircuiting.
  • ⁇ Electrical connections may be ⁇ made to the path 12 by means of the segments 17 4and 18 lying on each side of the slot 16.
  • a small area 19 at one end of each conductive path 12 on each of the sheets may be provided with a conductive material, such as a 10W melting point solder, to ⁇ permit the sheets to be stacked together and then hea-ted to melt the solder on each layer to make it adhere to the' adjacent layer.
  • a limited solder area 21 is ⁇ also provided on the other side of the sheet 11 at the other end of the conductive path 12.l
  • FIG. 2 shows a layer of insulating material 22 on the surface of the sheet 11.
  • a layer of evaporated silicon-dioxide approximately l0 microns thick was suilicient to insulate the copper.
  • the insulating material 22 In order to connect the sheets together electrically, the insulating material 22 must be kept off of, or removed frorn, a limited area at one end of the C-shaped path 12 (FIG. l). This may be done by masking a small area of the sheet 11 at the time the insulating material is applied and then later removing the mask and applying a small amount of metal that melts at a low temperature. For example, a small quanti-ty of tin may be evaporated onto the area 19.
  • FIG. 4 shows an expanded spiral made up of a number of sheets corresponding to sheet 11. Normally, of course, the layers of such a spiral would not be spread apart; this is done here only for illustrative purposes. As may be seen, the slots 14 of the various layers need not Abe aligned with one another, so that the whole stack forms something approaching a monolithic conductive block which serves as an excellent heat conductor to carry heat away from the area where the electrical current is flowing, i.e. in the inner C-shaped path 12 of each layer. Because of thehintegral formation of the conductive path 12 and the outer segments of each sheet, these outer segments are well adapted to serve as cooling fins to carry heat away from the conductive path portion 12.
  • the electrical current will not fow Vacross the slots 14 and is, therefore, confined substantially entirely to the conductive path 12. Even if the current fringes slightly into the outer segments, it will not adversely affect the shape of the magnetic field to any significant degree and may be easily compensated for.
  • a coil comprising a plurality of turns, each of said turns comprising a circular sheet of conductive non-ferromagnetic material having a central aperture therein; a first slot extending from the edge of said circular sheet to said aperture; a plurality of other V-shaped slots extending from the edge of said sheet part of the way in toward said aperture, said other slots being spaced substantially equi-distantly around said sheet and leaving a C-shaped, conductive path surrounding and defining said aperture with the ends of said C-shaped, conductive path bounding and defining the innermost ends of said one slot; a rst solder layer in a limited region at one end of said C- shaped, conductive path on one surface of said sheet; a second solder layer in a second limited region on the other surface of said sheet at the other end of said C-shaped, conductive path; and an insulating layer intimately attached -to and covering both surfaces of said sheet except for each of said solder layers, the first solder layer of each of said turns being fused to the
  • a coil comprising a plurality of turns, each of said i turns comprising a circular sheet of conductive non-ferromagnetic material having a central aperture therein; a first slot extending from the edge of said circular sheet to said aperture; a plurality of other V-shaped slots extending from the edge of said sheet part of the way in toward said aperture, said other slots being spaced substantially equi-distantly around said sheet and leaving a C-shaped, conductive path surrounding and defining said aperture with the ends of said Clshaped, conductive path bounding and defining the innermost ends ofV said one slot; a first solder layer in a limited region at one end of said C-shaped, conductive path on one surface of said sheet; a second solder layer in a second limited region on the other surface of said sheet at the other end of said C-Shaped, conductive path; and a layer of evaporated silicon dioxide intimately attached to and covering both surfaces of said sheet except for each of said solder layers, the first solder layer of each of said turns being fused to

Description

Sept 22 1964 A. P. wlLsKA 3 15 COIL HAVING HEAT coNDUcTIvE sEGMENTs 0339 AND C-SHAPE CONDUCTIVE PATH Filed July 5, 1962 A rroA/EYS United States Patent O 3,150,339 COIL HAVlNG HEAT CONDUCTIVE SEGMENTS AND C-SHAPED `CNDUCTIVE PATH Alvar P. Wilska, Tucson, Ariz., assignor to Philips Electronics and Pharmaceutical Industries Corp., New York, N.Y., a corporation of Maryland Filed `Iuly 5, 1962, Ser. No. 207,707 2 Claims. (Cl. 336-61) This invention relates to an electrical coil for producing a concentrated magnetic field. In particular, it relates to a coil suitable for use in electron beam focusing devices and not requiring ferromagnetic material to concentrate the magneticeld.
It isY frequently desirable to produce strong magnetic fields in concentrated spaces, `particularly in devices making use of electron beams, such as electron microscopes and traveling wave tubes andthe like. It has long been known that magnetic elds may be produced by the passage of an electric current through a conductive coil and that such fields can be concentrated or shaped to a limited extent by shaping the coil itself. However, it has been thought heretoforethat, in order to have a very highly concentrated magnetic eld produced by currentV flowing through :a coil, the coil would :have to be ywound n, or associated closely with, a ferromagnetic core structure.
In certain electron beam devices, particularly electron microscopes, the inhomogeneities of a ferromagnetic core structure introduce distortions-in the magnetic field that result in unacceptable distortions of the beam. These inhomogeneities are yat least partly determined by the crystalline structure of the ferromagnetic material and are not systematic and cannot be completely corrected.
Furthermore, hysteresis effects in ferromagnetic matevrial makes it ditlicult to control variations in the magnetic intensity to the precise amount that is frequently required. One reason is that the hysteresis effect results in a nonlinear variation of the magnetic eld, even if the electric current in the associated coil can be varied linearly. For another thing, the domains of the ferromagnetic particles shift abruptly. In addition, the non-linearity is made worse by the fact that ferromagnetic materials become saturated when the magnetic ilux exceeds a certain amount, depending on the volume of ferromagnetic material involved.
The present invention comprises a coil capable of producing highly concentrated magnetic elds Without ferromagnetic material. The coil is made up of individual, conductive layers each of which is in the form of a conductive sheet with an almost-closed circuit surrounding an inner non-conductive, or open, space. The edges of the sheet extend outwardly from the circuit and are formed integrally therewith by means of slots extending from the edge of the sheet in toward the circuit. Any number of these layers may be stacked together, but they must be insulated from one another, and also in accordance with the present invention, this insulation may be in the form of a 'thin layer of material, such as evaporated silicon dioxide. In order to connect the layers together, a limited area at the end ofthe circuit on one side of the sheet is kept free of insulating material and is covered instead with solder or the like so that the layers may be stacked together and heated simultaneously to cause the solder at one end of each circuit to become attached to the other end of the circuit of the next adjacent layer.
The inven-iton will be described in greater detal in connection with the drawing, in which:
FIG. 1 shows a single layer of -a coil constructed according to the invention;
FIG. 2 shows an enlarged cross-sectional view of the layer in FIG. l taken along the line 2 2;
3,150,339 Patented Sept. 22, 1964 ice FIG. 3 shows an enlarged cross-sectional view of a. stack of such layers; and
FIG. 4 shows a coil constructed in accordance with FIG. 3 expanded axially.
The coil layer in FIG. l comprises a sheet 11, which in this case is a circular sheet of conductive material, such as copper. The sheet may have any desired thickness; in a particular embodiment, I have used a sheet having a thickness of approximately Zmils. The sheet has a C- shaped, conductive path or circuit 12 defined by an open inner area 13 and, less explicitly, by the inner ends of a plurality of slots 14 spaced around the sheet. The slots 14 may be spaced at approximately equal angles, although this is not necessary, .and normally they extend `approximately radially in toward the center of the area 13.
In order to deiine a conductive path 12, the slots 14 extend only part way from the edge of the sheet 11 toward the open area 13. However, one slot 16 extends all the way in to theopen area to give the conductive path 12 a C-shaped configuration so that it will not be self shortcircuiting. `Electrical connections may be `made to the path 12 by means of the segments 17 4and 18 lying on each side of the slot 16.
Alternatively, and particularly if a number of sheets, such as sheet 11, are to be connected together, a small area 19 at one end of each conductive path 12 on each of the sheets may be provided with a conductive material, such as a 10W melting point solder, to `permit the sheets to be stacked together and then hea-ted to melt the solder on each layer to make it adhere to the' adjacent layer. Preferably, a limited solder area 21 is `also provided on the other side of the sheet 11 at the other end of the conductive path 12.l
' In order to stack a multiplicity of sheets 11 together,
or even to permit a single sheet to be attached to a conductive body, it is` desirable to insulate the surface of the sheet. FIG. 2 shows a layer of insulating material 22 on the surface of the sheet 11. In the example referred to `above of a 2mil sheet 11, it was found that a layer of evaporated silicon-dioxide approximately l0 microns thick was suilicient to insulate the copper.
In order to connect the sheets together electrically, the insulating material 22 must be kept off of, or removed frorn, a limited area at one end of the C-shaped path 12 (FIG. l). This may be done by masking a small area of the sheet 11 at the time the insulating material is applied and then later removing the mask and applying a small amount of metal that melts at a low temperature. For example, a small quanti-ty of tin may be evaporated onto the area 19.
When a plurality of sheets 11 is to be connected together in a stack, as indicated in FIG. 3, it is necessary to arrange the sheets so that the low-melting-temperature metal at one end of the conductive C-shaped path of one sheet will join with the low-melting-temperature metal at the other end of the next adjacent sheet. This is indicated in FIG. 3 by the junction between the area 21a of sheet 11a, which is directly in contact with and is`fused to the area 19h of sheet 11b. Upon reflection it will be apparent that the points of contact are not in a straight line and therefore in the two sheets 11c and 11d at the other end of the stack the corresponding areas 21c and 19d are angularly displaced from the areas 21a and 19b.
FIG. 4 shows an expanded spiral made up of a number of sheets corresponding to sheet 11. Normally, of course, the layers of such a spiral would not be spread apart; this is done here only for illustrative purposes. As may be seen, the slots 14 of the various layers need not Abe aligned with one another, so that the whole stack forms something approaching a monolithic conductive block which serves as an excellent heat conductor to carry heat away from the area where the electrical current is flowing, i.e. in the inner C-shaped path 12 of each layer. Because of thehintegral formation of the conductive path 12 and the outer segments of each sheet, these outer segments are well adapted to serve as cooling fins to carry heat away from the conductive path portion 12. However, the electrical current will not fow Vacross the slots 14 and is, therefore, confined substantially entirely to the conductive path 12. Even if the current fringes slightly into the outer segments, it will not adversely affect the shape of the magnetic field to any significant degree and may be easily compensated for.
In the case of a 90.layer coil made up of 2-rnil sheets, I have found it possible to obtain a mm. focal length in an electron beam accelerated to 10,000 volts with'a temperature rise in the coil of only approximately 4 C. above ambient temperature, even though the heat radiated by the coil amount to 36 watts. The number of ampere turns was 1,000. The same coil operated with a beam accelerated to 90,000 volts, and with the coils dissipating 108 watts with 3,000 ampere turns, had a temperature rise of only approximately 12 C. above ambientV temperature.
While this invention hasbeen described in terms of a particular embodiment, it will be Vrecognized by those skilled in the art that modifications may be made therein without departing from the true scope of the invention as defined by the following claims.
What is claimed is:
1. A coil comprising a plurality of turns, each of said turns comprising a circular sheet of conductive non-ferromagnetic material having a central aperture therein; a first slot extending from the edge of said circular sheet to said aperture; a plurality of other V-shaped slots extending from the edge of said sheet part of the way in toward said aperture, said other slots being spaced substantially equi-distantly around said sheet and leaving a C-shaped, conductive path surrounding and defining said aperture with the ends of said C-shaped, conductive path bounding and defining the innermost ends of said one slot; a rst solder layer in a limited region at one end of said C- shaped, conductive path on one surface of said sheet; a second solder layer in a second limited region on the other surface of said sheet at the other end of said C-shaped, conductive path; and an insulating layer intimately attached -to and covering both surfaces of said sheet except for each of said solder layers, the first solder layer of each of said turns being fused to the second solder layertof the adjacent turn, said turns being in `surface-to-surface contact to form a monolithic, hollow air-core coil.
2. A coil comprising a plurality of turns, each of said i turns comprising a circular sheet of conductive non-ferromagnetic material having a central aperture therein; a first slot extending from the edge of said circular sheet to said aperture; a plurality of other V-shaped slots extending from the edge of said sheet part of the way in toward said aperture, said other slots being spaced substantially equi-distantly around said sheet and leaving a C-shaped, conductive path surrounding and defining said aperture with the ends of said Clshaped, conductive path bounding and defining the innermost ends ofV said one slot; a first solder layer in a limited region at one end of said C-shaped, conductive path on one surface of said sheet; a second solder layer in a second limited region on the other surface of said sheet at the other end of said C-Shaped, conductive path; and a layer of evaporated silicon dioxide intimately attached to and covering both surfaces of said sheet except for each of said solder layers, the first solder layer of each of said turns being fused to the second solder layer of the adjacent turn, said turns being in surface-to-surface contact to form a monolithic, hollow air-core coil.
References Cited in the file of this patent UNITED STATES PATENTS 267,138 Blanchard Nov.Y 7, 1882 1,385,624 VKent n July 26, 1921 1,801,214 Von Henke Apr. 14, 1931 1,882,201 V Taetz Oct. 11, 1932 l2,061,388 Schou Nov. 17, 1936

Claims (1)

1. A COIL COMPRISING A PLURALITY OF TURNS, EACH OF SAID TURNS COMPRISING A CIRCULAR SHEET OF CONDUCTIVE NON-FERROMAGNETIC MATERIAL HAVING A CENTRAL APERTURE THEREIN; A FIRST SLOT EXTENDING FROM THE EDGE OF SAID CIRCULAR SHEET TO SAID APERTURE; A PLURALITY OF OTHER V-SHAPED SLOTS EXTENDING FROM THE EDGE OF SAID SHEET PART OF THE WAY IN TOWARD SAID APERTURE, SAID OTHER SLOTS BEING SPACED SUBSTANTIALLY EQUI-DISTANTLY AROUND SAID SHEET AND LEAVING A C-SHAPED, CONDUCTIVE PATH SURROUNDING AND DEFINING SAID APERTURE WITH THE ENDS OF SAID C-SHAPED, CONDUCTIVE PATH BOUNDING AND DEFINING THE INNERMOST ENDS OF SAID ONE SLOT; A FIRST SOLDER LAYER IN A LIMITED REGION AT ONE END OF SAID CSHAPED, CONDUCTIVE PATH ON ONE SURFACE OF SAID SHEET; A SECOND SOLDER LAYER IN A SECOND LIMITED REGION ON THE OTHER SURFACE OF SAID SHEET AT THE OTHER END OF SAID C-SHAPED, CONDUCTIVE PATH; AND AN INSULATING LAYER INTIMATELY ATTACHED TO AND COVERING BOTH SURFACES OF SAID SHEET EXCEPT FOR EACH OF SAID SOLDER LAYERS, THE FIRST SOLDER LAYER OF EACH OF SAID TURNS BEING FUSED TO THE SECOND SOLDER LAYER OF THE ADJACENT TURN, SAID TURNS BEING IN SURFACE-TO-SURFACE CONTACT TO FORM A MONOLITHIC, HOLLOW AIR-CORE COIL.
US207707A 1962-07-05 1962-07-05 Coil having heat conductive segments and c-shaped conductive path Expired - Lifetime US3150339A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE634473D BE634473A (en) 1962-07-05
NL294726D NL294726A (en) 1962-07-05
US207707A US3150339A (en) 1962-07-05 1962-07-05 Coil having heat conductive segments and c-shaped conductive path
DEP1268A DE1268740B (en) 1962-07-05 1963-07-02 Solenoid
CH823163A CH414858A (en) 1962-07-05 1963-07-03 Coil for generating a concentrated magnetic field
GB26758/63A GB1043886A (en) 1962-07-05 1963-07-05 Improvements in electro-magnetic coils
FR940486A FR1364871A (en) 1962-07-05 1963-07-05 Magnetic coil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US207707A US3150339A (en) 1962-07-05 1962-07-05 Coil having heat conductive segments and c-shaped conductive path

Publications (1)

Publication Number Publication Date
US3150339A true US3150339A (en) 1964-09-22

Family

ID=22771668

Family Applications (1)

Application Number Title Priority Date Filing Date
US207707A Expired - Lifetime US3150339A (en) 1962-07-05 1962-07-05 Coil having heat conductive segments and c-shaped conductive path

Country Status (6)

Country Link
US (1) US3150339A (en)
BE (1) BE634473A (en)
CH (1) CH414858A (en)
DE (1) DE1268740B (en)
GB (1) GB1043886A (en)
NL (1) NL294726A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541433A (en) * 1968-11-12 1970-11-17 Ariel R Davis Current supply apparatuses with an inductive winding and heat sink for solid state devices
US3684992A (en) * 1970-11-18 1972-08-15 Commissariat A L En Production of magnetic coils for the creation of intense fields
US3731243A (en) * 1971-12-08 1973-05-01 A Davis Inductive winding
DE3610690A1 (en) * 1986-03-29 1987-10-08 Steingroever Erich Dr Ing MAGNETIC FIELD COIL WITH DISC SHAPED CONDUCTOR
US20090154011A1 (en) * 2007-12-12 2009-06-18 Wen-Chien David Hsiao Magnetic write head having helical coil with a fin structure for reduced heat induced protrusion
US20100164665A1 (en) * 2008-03-20 2010-07-01 Abb Oy Method for manufacturing inductive electric component, and inductive electric component

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8501710D0 (en) * 1985-01-23 1985-02-27 Horstmann Magnetics Ltd Electromagnetic winding
NL8801208A (en) * 1988-05-09 1989-12-01 Philips Nv CHARGED PARTICLES BUNDLE DEVICE.
US5231330A (en) * 1991-10-25 1993-07-27 Itt Corporation Digital helix for a traveling-wave tube and process for fabrication

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US267138A (en) * 1882-11-07 Viegil w
US1385624A (en) * 1921-07-26 Induction-coil-heat-dissipating structure
US1801214A (en) * 1928-04-28 1931-04-14 American Electric Fusion Corp Edgewise coil and method of making the same
US1882201A (en) * 1929-07-18 1932-10-11 Telefunken Gmbh Choke coil
US2061388A (en) * 1933-10-27 1936-11-17 Fairbanks Morse & Co Insulating electrical coil winding

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT198331B (en) * 1955-04-21 1958-06-25 Sylvania Electric Prod Metallic helical coil and method and device for their manufacture

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US267138A (en) * 1882-11-07 Viegil w
US1385624A (en) * 1921-07-26 Induction-coil-heat-dissipating structure
US1801214A (en) * 1928-04-28 1931-04-14 American Electric Fusion Corp Edgewise coil and method of making the same
US1882201A (en) * 1929-07-18 1932-10-11 Telefunken Gmbh Choke coil
US2061388A (en) * 1933-10-27 1936-11-17 Fairbanks Morse & Co Insulating electrical coil winding

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541433A (en) * 1968-11-12 1970-11-17 Ariel R Davis Current supply apparatuses with an inductive winding and heat sink for solid state devices
US3684992A (en) * 1970-11-18 1972-08-15 Commissariat A L En Production of magnetic coils for the creation of intense fields
US3731243A (en) * 1971-12-08 1973-05-01 A Davis Inductive winding
DE3610690A1 (en) * 1986-03-29 1987-10-08 Steingroever Erich Dr Ing MAGNETIC FIELD COIL WITH DISC SHAPED CONDUCTOR
US4794358A (en) * 1986-03-29 1988-12-27 Dietrich Steingroever Magnetic field coil with disc-shaped conductor
DE3610690C5 (en) * 1986-03-29 2005-12-08 Magnet-Physik Dr. Steingroever Gmbh Magnetic coil with disc-shaped conductor
US20090154011A1 (en) * 2007-12-12 2009-06-18 Wen-Chien David Hsiao Magnetic write head having helical coil with a fin structure for reduced heat induced protrusion
US8031432B2 (en) 2007-12-12 2011-10-04 Hitachi Global Storage Technologies Netherlands B.V. Magnetic write head having helical coil with a fin structure for reduced heat induced protrusion
US20100164665A1 (en) * 2008-03-20 2010-07-01 Abb Oy Method for manufacturing inductive electric component, and inductive electric component

Also Published As

Publication number Publication date
CH414858A (en) 1966-06-15
DE1268740B (en) 1968-05-22
GB1043886A (en) 1966-09-28
BE634473A (en)
NL294726A (en)

Similar Documents

Publication Publication Date Title
US3150339A (en) Coil having heat conductive segments and c-shaped conductive path
US3195084A (en) Electrical apparatus having foil wound windings and metallic duct formers
JPS63272020A (en) Toroidal coil device and manufacture thereof
US3007087A (en) Electromagnetic deflection coil
US2557180A (en) Apparatus for coupling ultra high frequency systems
US2910662A (en) Printed transformer
US2550592A (en) Focusing coil for cathode-ray tubes
US2810053A (en) High frequency inductor for small diameter holes
US3356976A (en) Quadrupole magnet
US3418505A (en) Direct current motor having a self-supporting shell rotor
US2785265A (en) Inductor
US2484650A (en) Induction brazing apparatus
US2925541A (en) Voice coil structure
US2424973A (en) Transformer
US3359394A (en) Persistent current switch
US2385031A (en) Multiple-channel inductive heating apparatus
US2789247A (en) Traveling wave tube
US2813212A (en) Electromagnetic cathode ray beam deflection system
US2477118A (en) High-frequency induction heating apparatus
US3585531A (en) Magnetically variable microstrip directional coupler deposited on ferrite substrate
US2722621A (en) Device for deflecting the cathode-ray in cathode-ray tubes
US3310763A (en) Deflection yoke coil
JP6060206B2 (en) Annular coil
US3214609A (en) Hall effect apparatus
US1834445A (en) Inductor coil