Abstract: A dual-permeability magnetic core structure is provided for use in small, high-frequency inductors and transformers. The dual-permeability corer encloses a winding window containing planar windings and comprises high-permeability and low-permeability sections positioned to produce a highly uniform, or uniformly varying, magnetic field on the winding surfaces. The dual-permeability core produces low winding losses and a low AC-to-DC resistance ratio. Fabrication of the dual-permeability core involves a method of controlling the permeability of a magnetic material and a method of combining structures of two different permeability values.

Abstract: A plurality of inductor elements are arranged side by side in a sintered body obtained by stacking a plurality of ceramic green sheets to cofire the same. Each of the inductor elements comprises at least one line electrode extending in such a direction as to connect first and second side surfaces of the sintered body and outer electrodes electrically connected to both ends of the line electrode. The line electrodes constituting the adjacent inductor elements are formed so as not be positioned in the same plane, that is, in different positions of the heights.

Abstract: Here is disclosed an electric part in the form of windings particularly suitable to be implemented as a compact transformer comprising an inner bobbin having a cylindrical coil supporting portion around which a coil has been wound, and first and second outer bobbins having respective coil supporting portions square U-shaped in cross-sections and adapted to enclose the inner bobbin from upper and lower sides, wherein, after a coil has been wound around the coil supporting portions of the first and second outer bobbins, one leg of a core having legs is inserted into the coil supporting portion of the inner bobbin.

Abstract: In a transformer including a low-voltage input coil, a high-voltage output coil disposed coaxially of the low-voltage input coil, and a core for magnetically connecting both of the coils together; the improvement comprising a first bobbin around which the low-voltage input coil is wound which first bobbin has an inner-diameter hole, wherein the core comprises a rod portion to be inserted into the inner-diameter hole of the first bobbin and a flange portion provided at one axial end of the rod portion. In another aspect of the invention, the transformer further comprises a second bobbin around which the high-voltage output coil is wound, and a connector adapted to be connected to an ignition plug which connector is mounted on an end surface of the second bobbin on the opposite side of the flange portion of the core in such a manner that a mounting direction of the connector substantially coincides with an axial direction of the second bobbin.

Abstract: An electric noise absorber for holding a conduit of an electronic device comprises a retaining case composed of two box-shaped cases and auxiliary cases. A sponge-like member is fitted into the auxiliary case to prevent longitudinal movement of the cord or cable. A box-shaped case contains a magnet having a recess for receiving the cord or cable. It is possible to easily and securely attach and detach the electric noise absorber to the cord or cable by simply opening and closing the cases.

Abstract: Magnetic cores are manufactured from blanks of magnetically permeable sheet material that have core preforms including strip elements that are partially separated from adjacent portions of the blank. Stabilizer strip elements are provided at opposite sides of the preform and are partially separated from adjacent portions of the blank. A tube is attached to one end of the blank and a weight to an opposite end of the blank. After removal of portions of the blank adjacent to the strip elements, the strip elements are wound upon the tube while tension is applied to the strip elements by virtue of the weight. After the winding, the strip elements of the core preform define a core configuration, and the remainder of the blank is removed.

Abstract: Magnetic cores are manufactured from preforms of magnetically permeable strip material wrapped about non-magnetic supports. The preforms have configurations, such as an X-configuration, that determine the placement and helix angle of convolutions of the strip material that constitute the cores. In a preferred embodiment, corresponding ends of the legs of an X-configuration preform are placed upon a support, and the preform is wrapped about the support so as to form two superposed layers of convolutions, with the convolutions of corresponding portions of the layers having opposite helix angles.

Abstract: An electric noise absorber for attaching to a wire of an electronic device comprises a magnetic body divided into parts, a holding case composed of two case members and a locking device for preventing a movement of the magnetic body in the holding case. Each abutment surface of the two parts of the magnetic body cut by a cutting plane are sufficiently larger in area than a basic cross section of the magnetic body in order to prevent magnetic resistance of the abutment surface from being increased. Further, the dislocation of the two parts of the magnetic body can be prevented by the locking device. As a result, the magnetic body is securely held in the holding case to absorb noise curent effectively.

Abstract: A chip inductor having a pair of terminal electrodes formed on the surface of a magnetic core which holds a winding therearound. The terminal electrodes have films which are made from a nickel alloy having a relatively high resistivity and a relatively low magnetic permeability. Such nickel alloys includes, for example, nickel-chromium alloy, nickel-phosphorus alloy and nickel-copper alloy.

Abstract: A broadband, high power rf transformer is made by winding a tapered strip-line transmission-line conductor and dielectric material through two parallel slots, formed axially and symmetrically spaced apart, through a solid right cylinder of low loss magnetic material. Low inductance strip lines are used as leads. A thin sheet of high thermal conductivity material may be added in such a way as to augment heat flow with negligible degradation of rf properties. The design is particularly advantageous at frequencies from 1 MHz to 1000 MHz at pulse powers to several kilowatts at impedances from 2.OMEGA. to 75.OMEGA..

Abstract: Disclosed are compositions useful in fabricating blocks or inserts for inductors comprising:(a) about 98 percent to about 99.5 percent by weight of a high purity, annealed electrolytically prepared iron powder; and(b) about 0.5 percent to about 2 percent of an insulating polymer binder selected from the group consisting of epoxies, flourocarbon, hot melt adhesives, and mixtures thereof;wherein said iron powder has a specific surface area of less than about 0.25 m.sup.2 /g and a carbon content of less than about 0.01 percent; andwherein said composition after pressing at at least about 30 Tsi demonstrates a maximum of 5 percent regression in permeability and a total core loss of less than about 0.8 to about 1.2 ohms between 10 KHz and 500 KHz. Blocks and inserts made from such compositions, as well as methods of manufacturing such inserts, are also disclosed.

Abstract: A chip coil which includes a bobbin, flange portions formed at opposite end portions of the bobbin, a wire wound around a barrel portion of the bobbin, and at least two counter-part blocks of magnetic particle-containing solid resin, disposed around the wound wire. The counter-part blocks of magnetic particle-containing solid resin are adapted to be fixed to each other into one combined unit.

Abstract: An inductive device composed of a bead of magnetic material, such as ferrite, has an aperture through which an electrical conductor is adapted to pass. The bead is formed unsymmetrically about at least one axis. The asymmetry of the bead alters the magnetic characteristic of the bead so as to increase its ability to absorb volt-seconds on the conductor and thereby prevent destructively high currents. The inductive device is advantageously used in the d.c. supply to the power transistors of an inverter to protect the transistors from current surges due to the simultaneous conduction of the transistors.

Abstract: A ferrite core for the use of a power transformer and/or a choke coil with small size has been found. The core is assembled by a pair of identical core halves (21) together with a bobbin (31) wound a coil. Each of the core halves (21) has an E-shaped structure with a center core (23) on which a coil is wound, a pair of side legs (24) and a base plate (22) which couples the center core (23) with the side legs (24). The cross section of the center core (23) is not circular nor rectangular, but is flat having rectangular portion with a first side (2a) and a second side (b-2a) and a pair of arcs coupled with said first side. The diameter (2a) of the arc is the same as the length of the first side. The transformer is mounted on a printed circuit board so that the axis of the center core (23) is parallel to the printed circuit board. Thus, the height (H) of the transformer is low as compared with that of a prior transformer which has a circular center core.

Abstract: A spherical transformer and process for forming same is set forth. Hollow, hemispherical elements are rotated to enable a cooperating cutting tool to impart a helical impression therein. An adhesive is sprayed into the interiors of both hemispheres and thereafter powdered metal, such as stainless steel, is directed thereon to form a sheet-like core that when both hemispheres are joined to provide an uninterrupted metal core with said hemisphere. A primary winding is inserted into the aforenoted grooves about one hemisphere and a secondary winding is positioned into the helically cut grooves in said second hemisphere. The thusly formed transformer is positioned on a base for a stability thereof.

Abstract: A method of manufacturing a chip coil, including a coil element which includes a magnetic core, a winding wire, and internal terminal electrodes, a fired mass of magnetic material surrounding and encapsulating the coil element, and external terminal electrodes electrically connected to the internal terminal electrodes. The winding wire is coated with a heat-resistive electrically insulating film and is wound around the magnetic core. The internal terminal electrodes are electrically connected to opposite ends of the winding wire and are exposed to the exterior of the mass at opposite ends of the core where they are electrically connected to the external terminal electrodes.

Abstract: The watt-loss of the Fe-based amorphous alloy-thin strip is decreased by locally melting the surface of thin strip and again vitrifying the melting parts. In addition, the magnetic flux density is enhanced by annealing the thin sheet after the local melting.

Abstract: An electronic noise suppressor has a U-shaped wire or other conductor passing through two stacked ferrite beads. The bead near the legs of the conductor is of high frequency impedance and the bead at the head of the U is of low frequency impedance. The legs of the U-shaped conductor are connected into an electronic circuit in which noise is to be suppressed.

Abstract: An electromagnetic apparatus is provided with a magnetic core and a segmented electrical winding. The core has an enclosed trunk defining a central opening. At least three coil sections of the electrical winding encircle the trunk and are circumferentially spaced about the periphery of the core.

Abstract: The magnetic core comprises a stack of plates which extend mainly along a single axial direction. The stack cross-section has as envelope a curve comprised of two half circles with a radius a/2 and of two straight lines with a length (b-a) which connect together the end points of the half circles. The ratio b/a lies between 1.05 and 2 and preferably between 1.3 and 1.7.

Abstract: A microcoil having a winding on a composite core made up of a portion of substantially magnetic material and a portion of substantially non-magnetic material. The winding is split so that a part of the magnetic material core portion is exposed, and a laser is used to remove material from the exposed part of the magnetic core portion. The inductance of the coil is measured during the removal of the magnetic material, and the inductance of the coil is trimmed to a desired value through the removal of an appropriate amount of magnetic material. The non-magnetic core portion serves as a support structure for the portions of the winding on the core even if a substantial portion of the magnetic material is removed.

Abstract: A magnetic-field-dependent inductive proximity switch having a coil arrangement with a ferromagnetic core, which is saturation-sensitive with respect to the magnetic field to be picked up, and having an electronic analyzing circuit for triggering a switching process at a certain core saturation, is to be constructed so that its power requirement is very low, for example, in the range of 0.1 to 5.0 milliampere, and that, by means of said switch, a magnetic field can be picked up through a non-ferromagnetic wall and can be used to trigger switching operations.

Abstract: A miniature inductor used as a boosting coil in a piezoelectric buzzer drive circuit or the like is disclosed. The inductor has a closed magnetic circuit core formed of two cores covering the outer periphery of a coil wound around inner coil-cores. A pair of cutout windows are provided at the outer periphery of each of the cores, and joint plates are disposed on the inner bottom surface of one core. Terminal blocks project outwardly therefrom, so that the terminal blocks are adapted to be folded over each other. The end of each lead wire of the coil is guided through the cutout window and sandwiched between the folded terminal blocks, thereby connecting therewith.

Abstract: Disclosed is an magnetic core comprising a molded product made of an iron powder and/or an iron alloy magnetic powder having a mean particle size of 10 to 100 .mu.m, and 1.5 to 40%, as a total amount in terms of volume ratio, of an insulating binder resin and an insulating inorganic compound powder. Also disclosed is a useful method of producing the magnetic core.

Abstract: An electromagnetic apparatus is provided with a magnetic core and a segmented electrical winding. The core has an enclosed trunk defining a central opening. At least three coil sections of the electrical winding encircle the trunk and are circumferentially spaced about the periphery of the core.

Abstract: New ferrite pot core type products and fabrication methods are disclosed for production and assembly of tunable-inductance magnetically-soft ferrite devices. Unitary helical threads formed within the central opening of a ferrite pot core element provide controlled axial movement of a non-threaded male tuning member, carrying a ferrite rod, to adjust the air gap between spaced center posts of an assembled pair of pot core elements. Thread matching and registry requirements are eliminated by such unitary thread means which present either helical path die means, for cutting threads in a cylindrical nonmagnetic portion of a male tuning member or, circumferentially continuous helical threads, which deform nonmagnetic protrusions uniformly distributed about the periphery of a noncircular cross section nonmagnetic portion of a male tuning member during rotation of a male tuning member within a core element central opening.

Abstract: A stacked magnetic core constructed from amorphous strip material. The legs and yokes of the core include first and second laminations formed from a non-amorphous magnetic strip material. The first and second laminations are spaced from one another to define a gap therebetween. A plurality of laminations formed from an amorphous magnetic strip material is stacked in the gap. Means are provided to join the first and second non-amorphous laminations so as to reinforce and support the core.

Abstract: The invention relates to a magnetic circuit for inductance devices, to an induction device incorporating such circuit, as well as a process for producing the above-mentioned circuit. The novel magnetic circuit is constituted by a parallelepipedic bar of magnetic material comprising at least two substantially superimposed grooves. This circuit is substantially H-shaped in a plane perpendicular to said grooves. The lower branches of the H, delimiting the lower groove or grooves, are provided with electrical connection means. Consequently, the induction devices thus obtained may be easily and efficiently fixed onto printed circuits, or directly fixed onto hybrid circuit supports. The induction devices thus produced are particularly adapted to be miniaturized.

Abstract: This induction winding includes a magnetic core formed by a vertical stack of iron disks separated by air gaps. The disks (8) include a plurality of sector-shaped portions (1) each of which is constituted by a succession of magnetic laminations (6), a first part (12,13) of these laminations are all of identical length and a second part (14) are of regularly decreasing length from one lamination to the next. The direction (F.sub.1) in which the laminations are rolled in the mill is perpendicular to the axis (7) of the winding. The increased magnetic loss that this causes is compensated by the improved filling coefficient that can then be readily obtained.

Abstract: The new structure of a ferrite core for the use of a power transformer and/or a choke coil has been found. The core is assembled by a pair of identical core halves, and each core half comprises (a) a circular center boss (6), (b) a pair of outer walls (7, 8) positioned at both the sides of said boss for mounting a coil, (c) a pair of base plates (9, 10) coupling said center boss and said outer walls, (d) each of the outer walls being substantially rectangular with an external linear wall and an inner curved wall, (e) the core half being symmetrical with regard to the first plane including a center axis of said boss and being parallel with the external linear walls of said outer walls, (f) a concaved opening (R) being provided between said base plates in the first side of the core half with regard to the reference plane which includes a center axis of said boss and is perpendicular to said first plane, (g) the length (B.sub.

Abstract: A transformer characterized by groups of low voltage and high voltage windings inductively related to a core member, and a shunt of magnetizable microlaminations disposed between the low and high voltage windings, whereby the shunts independently adjust the transformer impedance.

Abstract: A rolled core is formed by winding a thin body of an amorphous magnetic alloy having positive magnetostriction characteristics so that, of the two surfaces the surface of smaller surface coarseness faces inward. This rolled core is improved in iron loss over a rolled core obtained by winding the thin body so that the surface of greater surface coarseness faces inward. Breakage of the thin body tends to occur less frequently when it is wound so that the surface faces inward.

Abstract: The new structure of a ferrite core for the use of a power transformer and/or a choke coil has been found. The core is assembled by a pair of identical core halves, and each of core half comprises (a) a circular center boss(12), (b) a pair of outer walls(14,16) positioned at both the sides of said boss(12) so that a fan-shaped empty space is provided between the circular boss(12) and a pair of outer walls(14,16) for mounting a coil, (c) a pair of base plates(18,20) coupling said boss(12) with said outer walls(14,16) at the extreme end of those members so that those members conform substantially with the E-shaped structure, (d) the other extreme end of said boss(12), the outer walls(14,16) and the base plates(18,20) residing on a single plane, (e) each of said outer walls(14,16) being essentially rectangular with the external linear wall and the inner curved wall which is coaxial with the circular boss(12), and the width(d.sub.2) of said external linear wall is larger than the diameter(d.sub.

Abstract: A compact core for a transformer wherein the central leg of the core is either trapezoidal or triangular in cross-section and wherein the two side legs of the transformer core are triangular in cross-section. The selection of a trapezoidal or triangular central core leg and triangular side legs significantly reduces the overall dimensions of the transformer by constructing the side legs of the core so as to protrude into the space which would normally be immediately above or below the side legs of an E-E or E-I transformer.

Abstract: The process provides practical manufacture of a two-piece, dielectric filled, ferrite toroid assembly while providing optimum electromagnetic characteristics presently not consistently available by manufacturing the toroid in a pressed one-piece configuration. A pair of complementary ferrite blanks of selected shapes are machined to dimension, and the mating surfaces thereof are selectively lapped. The complementary ferrite parts are then permanently assembled about a pre-machined dielectric insert, and the composite toroid is secured together by a selected adhesive selectively disposed therein.

Abstract: In a transformer or a reactor having at least one winding of foil-formed electrical conductor material, a magnetic-flux-controlling spirally-wound sheet of highly permeable ferro-magnetic material is arranged axially outside each end of the winding. The ends of the sheet are galvanically connected to the foil winding. By division of the magnetic material in the sheet, a high resistance in the longitudinal direction of the sheet, and thus lower losses, are obtained.

Abstract: A reactor formed by winding a conductor on a core which is formed by using mutually insulated particles of iron powder to provide a closed magnetic path. The reactor is less in leakage flux and has its inductance value accurately held over a wide frequency range.

Abstract: A sintered powdered aluminum core for an inductor used in the tuning stages of high frequency equipment is disclosed. Such cores have threads ground on them having sharp thread profiles, as opposed to the flat thread profiles produced by screw machines, and plating the cores produces superior eletrical properties.

Abstract: Amorphous magnetic metal alloys are processed by annealing at temperatures sufficient to achieve stress relief and cooling in directed magnetic fields or in zero magnetic fields.The ac and dc properties of magnetic cores produced in accordance with the processes of the invention may be tailored to match those of a wide range of magnetic alloys.Alloys processed in accordance with the invention provide improved performance in inductors, transformers, magnetometers, and electrodeless lamps.

Abstract: A method of making a metal core for alternating current applications by powder metallurgy is disclosed. Ferro-magnetic powder is pressed into a cross section of the core, with the thickness of the cross section approaching that below which the green density is no longer uniform throughout the volume of the part. Additional cross sections are pressed to meet the overall core thickness requirement when the sections are subsequently stacked. The sections are stacked in non contacting relationship and sintered. The sections are separated by an air gap or magnetic insulating medium.

Abstract: A semiconductor circuit comprising a reactor including a closed magnetic path core of a compression molding which is formed of a mixture of an insulating material and particles of magnetic substance and a conductor magnetically interlinking to the core, and a semiconductor element connected in series with the reactor.

Abstract: A reactor comprising an annular iron core constituting a closed magnetic path and a conductor wound on the iron core. The iron core is formed of particles of iron or an iron-based magnetic material. Each particle is covered with an insulative oxide film which contains 0.3 to 0.8% of oxygen by weight based on the particle.

Abstract: An electrical transformer having an electrical winding and a magnetic core having two parallel magnetic circuits having unequal mean lengths. The shorter of the parallel magnetic circuits is constructed of a magnetic material which exhibits a lower loss characteristic than the magnetic material used in the longer of the parallel magnetic circuits, at like levels of induction.

Abstract: A ferrite toroid has two radially extending gaps. Into each gap there is inserted an insulative shim having a magnetic metal ribbon folded over the shim. When current is applied to a winding on the core, the resultant magnetic flux is steered into the magnetic ribbons and around the gaps. For high frequency excitations eddy current losses in the ribbons are high and the windings have low Q but high inductance. At high winding currents, the magnetic ribbons are saturated, the inductance is reduced and the Q of the winding increases. In a switching voltage regulator, this inductor tends to generate only a small amount of ringing and electromagnetic radiation noise.

Abstract: The following specification describes a self-generating electrical pickup to be applied to percussion type musical instruments with vibrating elements of steel or containing ferromagnetic material. The pickup is used in conjunction with an amplifier and loudspeaker to amplify the instrument sound. The pickup makes use of a plurality of pick off coils, one of each is used in proximity to each vibrating element of the musical instrument. Each pick off coil consists of a coil of many turns of fine wire within which is placed an iron core to which is bonded a ceramic permanent magnet. The large surface area of the ceramic magnet adjacent to the musical instrument vibrating element causes large magnetic flux changes in the coil and consequently a large signal voltage which is amplified to drive the loudspeaker. The large signal available, in this design, reduces the effect of 60 Hz hum induced by stray electromagnetic fields. The use of a ceramic magnet provides for a cost effective design.

Abstract: A stabilized saturated reactor comprising a solid toroidal core of magnetic material. The core has at least one end face provided with plural circumferentially spaced slots. Each slot extends in a substantially radial plane with respect to the central axis of the core. Each slot has a width substantially less than the cross-sectional dimensions of the core. The core may have a second end face which is provided with plural slots staggered circumferentially in relation to the slots in the other end face to simulate a linear reactor. The core, with both end faces slotted, may be combined under a common winding with an unslotted saturated toroidal core spaced therefrom to simulate the stabilized saturated reactor core having only one slotted end face.

Abstract: A method of manufacturing three dimensional integrated circuits from compatible co-fireable materials by extruding batched co-fireable materials to form blocks of specified cross-sections, selecting and stacking cross-section of various widths from different blocks in a specified manner to form the desired circuit and placing the stack in a furnace having a predetermined temperature time profile to properly sinter each of the materials.

Abstract: A device for controlling an A.C. motor having an electromagnetic field ining coil wound around a conductive element having at least one inwardly directed opening bound by surface areas thereof and having a gap a between the surface areas defined by the formula a .gtoreq. .delta., wherein .delta. is the wave penetrating depth of an instantaneous operating frequency of the induced electromagnetic energy, the coil being wound so as to surround the open space and the element.

Abstract: An electrical transformer comprises a core structure formed from magnetizable material and comprising a first annular element in the peripheral surface of which is formed at least a pair of helical slots. The core structure includes a second element which closes the open ends of the slots and located in each slot is at least two windings forming the primary and secondary windings of the transformer. Each winding extends along one slot and returns along the adjacent slot.

Abstract: The process provides practical manufacture of a two-piece, dielectric filled, ferrite toroid assembly while providing optimum electromagnetic characteristics presently not consistently available by manufacturing the toroid in a pressed one-piece configuration. A pair of complementary ferrite blanks of selected shapes are machined to dimension, and the mating surfaces thereof are selectively lapped. The complementary ferrite parts are then permanently assembled about a pre-machined dielectric insert, and the composite toroid is secured together by a selected adhesive selectively disposed therein.