Abstract: Disclosed herein is a planar magnetic element comprising a substrate, a first magnetic layer arranged over the substrate, a first insulation layer arranged over the first magnetic layer, a planer coil formed of a conductor, having a plurality of turns, arranged over the first insulation layer and having a gap aspect ratio of at least 1, the gap aspect ratio being the ratio of the thickness of the conductor to the gap between any adjacent two of the turns, a second insulation layer arranged over the planar coil, and a second magnetic layer arranged over the second insulation layer. When used as an inductor, the planar magnetic element has a great quality coefficient Q. When used as a transformer, it has a large gain and a high voltage ratio. Since the element is small and thin, it is suitable for use in an integrated circuit, and can greatly contribute to miniaturization of electronic devices.

Abstract: A planar inductor has a spiral coil, insulating layers stacked on both surfaces of the spiral coil, and ferromagnetic layers stacked on the insulating layers, wherein each ferromagnetic layer has a saturation magnetization 4&pgr;Ms of 10 kG or more, and a thickness of 100 &mgr;m or less.

Abstract: Disclosed herein is a planar magnetic element comprising a substrate, a first magnetic layer arranged over the substrate, a first insulation layer arranged over the first magnetic layer, a planer coil formed of a conductor, having a plurality of turns, arranged over the first insulation layer and having a gap aspect ratio of at least 1, the gap aspect ratio being the ratio of the thickness of the conductor to the gap between any adjacent two of the turns, a second insulation layer arranged over the planar coil, and a second magnetic layer arranged over the second insulation layer. When used as an inductor, the planar magnetic element has a great quality coefficient Q. When used as a transformer, it has a large gain and a high voltage ratio. Since the element is small and thin, it is suitable for use in an integrated circuit, and can greatly contribute to miniaturization of electronic devices.

Abstract: A planar inductor has a spiral coil, insulating layers stacked on both surfaces of the spiral coil, and ferromagnetic layers stacked on the insulating layers, wherein each ferromagnetic layer has a saturation magnetization 4&pgr;MS of 10 kG or more, and a thickness of 100 &mgr;m or less.

Abstract: Disclosed herein is a planar magnetic element comprising a substrate, a first magnetic layer arranged over the substrate, a first insulation layer arranged over the first magnetic layer, a planer coil formed of a conductor, having a plurality of turns, arranged over the first insulation layer and having a gap aspect ratio of at least 1, the gap aspect ratio being the ratio of the thickness of the conductor to the gap between any adjacent two of the turns, a second insulation layer arranged over the planar coil, and a second magnetic layer arranged over the second insulation layer. When used as an inductor, the planar magnetic element has a great quality coefficient Q. When used as a transformer, it has a large gain and a high voltage ratio. Since the element is small and thin, it is suitable for use in an integrated circuit, and can greatly contribute to miniaturization of electronic devices.

Abstract: Disclosed is a dc-to-dc converter comprising a switching transistor, a pulse-width modulation controller, a sandwich-type planar inductor, which accumulates an electromagnetic energy at ON state and releases the accumulated electromagnetic energy at OFF state of the switching transistor, a smoothing capacitor, a rectifying element, and a planar search coil for detecting an overcurrent flowing the planar coil, disposed on one of the outer surfaces of the soft magnetic layers constituting the planar inductor.

Abstract: Disclosed is a dc-to-dc converter comprising a switching transistor, a pulse-width modulation controller, a sandwich-type planar inductor, which accumulates an electromagnetic energy at ON state and releases the accumulated electromagnetic energy at OFF state of the switching transistor, a smoothing capacitor, a rectifying element, and a planar search coil for detecting an overcurrent flowing the planar coil, disposed on one of the outer surfaces of the soft magnetic layers constituting the planar inductor.

Abstract: Disclosed herein is a planar magnetic element comprising a substrate, a first magnetic layer arranged over the substrate, a first insulation layer arranged over the first magnetic layer, a planer coil formed of a conductor, having a plurality of turns, arranged over the first insulation layer and having a gap aspect ratio of at least 1, the gap aspect ratio being the ratio of the thickness of the conductor to the gap between any adjacent two of the turns, a second insulation layer arranged over the planar coil, and a second magnetic layer arranged over the second insulation layer. When used as an inductor, the planar magnetic element has a great quality coefficient Q. When used as a transformer, it has a large gain and a high voltage ratio. Since the element is small and thin, it is suitable for use in an integrated circuit, and can greatly contribute to miniaturization of electronic devices.

Abstract: A pipe joint for connecting a flexible corrugated tube includes a joint body, a sleeve received in an axial through bore in the joint body for holding a free end of the flexible corrugated tube, and a nut threadedly fitted in a threaded portion of the joint body. A shoulder is formed on an inner surface of the through bore, and has an air-tight surface directed toward one end of the through bore. A tapering surface, decreasing in diameter progressively toward the shoulder, is formed on the inner surface of the through bore in adjacent relation to the shoulder. An annular groove of a generally channel-shaped cross-section is formed in the inner surface of the through bore in adjacent relation to the tapering surface. The sleeve has projections extending radially inwardly from one end thereof facing said shoulder, the sleeve having an end surface at the other end thereof.

Abstract: Disclosed is a planar inductor which has spiral conductor coil means sandwiched between ferromagnetic layers with insulating layers interposed therebetween. The spiral conductor coil means is formed of two spiral conductor coils of the same shape arranged flush with and close to each other. Moreover, the two spiral conductor coils are connected electrically to each other so that currents of different directions flow individually through the conductor coils. Furthermore, the spiral conductor coil means is sandwiched between the two ferromagnetic layers with the insulating layers therebetween, each of the ferromagnetic layers having an area greater than the combined area of the two conductor coils. In the planar inductor according to the present invention, inductance is prevented from lowering while its components are being bonded together, so that the inductance value per unit volume is increased.

Abstract: There is disclosed an amorphous alloy for a magnetic core material represented by the formula(Co.sub.1-x.sbsb.1.sub.-x.sbsb.2 Fe.sub.x.sbsb.1 M.sub.x.sbsb.2).sub.x.sbsb.3 B.sub.x.sbsb.4 Si.sub.100-x.sbsb.3.sub.-x.sbsb.4wherein M is at least one element selected from the group consisting of Ti, V, Cr, Mn, Ni, Zr, Nb, Mo, Ru, Hf, Ta, W and Re, and x.sub.1, x.sub.2, x.sub.3 and x.sub.4 are numbers which satisfy relations of 0.ltoreq.x.sub.1 .ltoreq.0.10, 0.ltoreq.x.sub.2 .ltoreq.0.10, 70.ltoreq.x.sub.3 .ltoreq.79 and 5.ltoreq.x.sub.4 .ltoreq.9, respectively.According to the present invention, it could be provided an amorphous alloy suitable for a magnetic core material of a magnetic amplifier in which its coercive force is as low as 0.4 oersted or less at a high frequency of 20 KHz or more, particularly even at 50 KHz, and its rectangular ratio is as much as 85% or more.

Abstract: There is disclosed a low-loss amorphous alloy represented by the following formula:(Fe.sub.1-a-b Nb.sub.a M.sub.b).sub.100-c X.sub.cwherein M is at least one metallic element selected from the group consisting of V, Cr, Mo, Ta and W; X is B or a combination of B and Si (the amount of the Si is 10 or less atomic percent of its formula weight); and a, b and c satisfy the relation of 0.01.ltoreq.a.ltoreq.0.075, 0.ltoreq.b.ltoreq.0.05, 0.02.ltoreq.a+b.ltoreq.0.075, and 12.ltoreq.c.ltoreq.21, respectively.The amorphous alloys of the present invention exhibit larger saturation magnetic flux densities and less iron losses than the conventional ferrite at a high frequency region.

Abstract: A high frequency switching circuit comprised of a single-ended switching circuit, rectifying-smoothing circuit and magnetic amplifier which is connected between said single-ended switching circuit and rectifying-smoothing circuit. The magnetic amplifier includes a saturable reactor which has a coercive force Hc of 0.6 Oe or above and a rectangular ratio Br/Bs of 80% or below at an operating frequency of 20 kHz. The saturable reactor is prepared from an amorphous magnetic alloy having a composition of(Co.sub.1-a-b-c Fe.sub.a Ni.sub.b M.sub.c).sub.1-d X.sub.dwhere:M=one element selected from a group consisting of the elements of Nb, Cr, Mo, V, Ta, Ti, Zr and WX=B or a compound of B and Si in which the content of Si is set at 25 atomic % or less0.04.ltoreq.a.ltoreq.0.150.ltoreq.b.ltoreq.0.100.005.ltoreq.c.ltoreq.0.100.15.ltoreq.d.ltoreq.0.30.

Abstract: A switching element, a transformer having a primary winding connected through said switching element to a DC power supply and a resonance capacitor connected in parallel with the primary winding of said transformer constitute a single-ended switching circuit. A magnetic amplifier is connected between the secondary side circuit of the transformer of the single-ended switching circuit and a rectifying/smoothing circuit, thus forming a high frequency switching circuit.

Abstract: An amorphous magnetic alloy has a general formula:(Fe.sub.1-a.Ni.sub.a).sub.100-x-y.Si.sub.x.B.sub.ywhere0.2.ltoreq.a.ltoreq.0.71.ltoreq.x.ltoreq.205.ltoreq.y.ltoreq.9.515.ltoreq.x+y.ltoreq.29.5The alloy is low in iron loss and suitable for forming a magnetic core used under a high frequency.

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: An amorphous alloy of high magnetic permeability, having a general formula;(T.sub.y Nb.sub.x A.sub.1-x-y).sub.100-z X.sub.zwhere,"A" is at least one kind selected from the group consisting of 0.5 to 10 atomic % of V, Ta, Ti, Zr, Cr, Mo, W and 0.5 to 30 atomic % of Ni based on the total amount of T, Nb and A,"T" is at least one element selected from the group of Fe and Co,"X" is B or B+Si, the amount of Si being at most 25 atomic % based on the total amount of the alloy,"x" ranges between 0.005 and 0.1,"y" ranges between 0.5 and 0.99, and"z" ranges between 15 and 35, with the proviso of 0.005.ltoreq.1-x-y.ltoreq.0.4.