Abstract: A magnetic sensor of orthogonal flux-gate type is provided with a cylindrical core made of a soft magnetic material; an internal conductor that is placed inside the core; a detection coil wound up on the core; and an external conductor that is placed around the core and electrically connected to the internal conductor. A high-frequency current is allowed to flow through the internal core so that a magnetic field to be measured which resides around the detection coil is changed and the intensity and direction of the magnetic field to be measured is detected on the basis of an output of the detection coil. Since the external conductor is placed on the periphery of the core, it is possible to prevent the magnetic flux formed by the core from magnetizing any space, and consequently to concentrate the magnetic field on the core.

Abstract: A DC current sensor has a detecting core with a plurality of detecting core members adapted to be divided in a circumferential direction for receiving the lead wire. A pair of annular exciting cores on one of said detecting core members formed of saturable magnetic material has a core intersection inter-connected perpendicularly to the circumferential direction of said detecting core members, and are disposed oppositely in spaced relation with said detecting core members to magnetically saturate a portion thereof by a magnetic flux produced substantially in the perpendicular direction against a magnetic flux in the circumferential direction, produced by the DC current flowing through said lead wire being detected, and to interrupt a magnetic path by the magnetic flux in the circumferential direction periodically. Exciting coils are wound around the exciting cores in negative-phase excitation.

Abstract: A DC current sensor, comprising a detecting core consisting of an annular soft magnetic material having a hollow portion extending in a circumferential direction within the core; an excitation coil wound and disposed in a circumferential direction in the hollow portion; a detecting coil toroidally wound around the detecting core; a lead wire through which a DC current for non-contact detection flows, and extended through the center of the detecting core; an AC current supply for applying current to the excitation coil for periodically magnetically saturating the entire detecting core in both the circumferential and a direction perpendicular thereto, whereby the magnetic flux produced in the detecting core can be modulated according to the DC current flowing through the lead wire and being detected upon excitation of the excitation coil; and the detecting coil producing an electromotive force having a frequency twice the excitation current for detecting the DC current flowing through the lead wire.

Abstract: A DC current sensor with an exciting core of soft magnetic material and formed with a pair of tubular bodies, each tubular body being positioned in parallel with the other to provide therebetween a space, through which passes a wire conducting a current to be detected; a detecting core formed with the side faces of a pair of tubular bodies and two plate-like members of soft magnetic material, each of which connecting integrally with each of the inside edges thereof near an opening of the tubular bodies to form a rectangular frame-shaped member as a whole; exciting coils, each of which magnetically energizing the exciting core in the direction perpendicular to the plane of the detecting core; detecting coils, each of which being wound around the detecting core; and applying an alternating current to the exciting coils to periodically and magnetically saturate the rectangular-shaped portions of the detecting core and exciting core, energizing the exciting coils to modulate a magnetic flux produced in the detect

Abstract: A DC current sensor using a continuous annularly-shaped detecting core of soft magnetic material; a continuous annularly-shaped exciting core of soft magnetic material intersecting with the detecting core perpendicular to the plane thereof; respective detecting and exciting coils wound respectively around the detecting and the exciting cores; an AC excitation of a given frequency applied to the exciting coil to saturate the detecting core; a wire conducting DC current to be detected extending through the detecting core to establish a magnetic flux therein; and a detector connected to the detecting coil for detecting the magnetic flux modulated by the AC excitation to detect the DC current flowing in the wire.

Abstract: This invention provides heat-conductive materials which may receive evenly the heat as applied thereto, which have an improved heat-releasing effect, which are free from fine pores on the surfaces thereof and therefore have excellent adhesiveness to thin films of plating materials or brazing materials, which have excellent compatibility with materials to be applied thereto, such as chips or sealant resins, with respect to the thermal expansion coefficients of them, and have excellent thermal conductivity, and which may have any desired thermal expansion coefficient and thermal conductivity in accordance with the use and object of them. It also provides methods of producing the heat-conductive materials.

Abstract: A heat-conductive composite material usable as a substrate (heat sink) for mounting a semiconductor thereon or a lead frame includes which comprises a core sheet and metal foil layers welded to the both surfaces of the core sheet. The core sheet is composed of a metal sheet of high thermal expansion sandwiched between two metal sheets of low thermal expansion, each having a number of through-holes in the direction of the thickness, and the three layers are laminated and integrated so that a part of the metal sheet of high thermal expansion is exposed out to the metal surfaces of low thermal expansion through the through-holes of the metal sheets of low thermal expansion The metal foil layers each are made of a metal of high thermal expansion, which are same as or different from the metal of high thermal expansion of constituting the core sheet.

Abstract: A trigger switch for hand-held electric power tools in which an actuating arm for actuating a switch mechanism is pivotally supported in a case by way of a pivot shaft pivotally supported by a pair of parallel lateral walls defining the case, and a trigger member having a front end and a pair of lateral flanges is pivotally supported by the case in a coaxial relationship with the pivot shaft by way of the lateral flanges. By securely coupling an extension of the pivot shaft with one of the flanges, the switch mechanism internally accommodated in the case can be actuated by operating the trigger member. Since the switch mechanism is internally accommodated in the case, a considerable saving of space can be accomplished. Since the coupling between the pivot shaft and the trigger member can be accomplished by the extension of the pivot shaft passed through the case by way of a round opening provided in the case, sealing of the switch mechanism can be easily accomplished.

Abstract: A clad sheet comprising a metal substrate and a metal cladding layer laminated on at least one surface of said substrate, wherein said cladding layer-laminated surface of said substrate includes a hardened layer portion formed by melting and rapid solidification through laser beam irradiation. In intermediate layer may be interposed between the substrate and the cladding layer through like hardened layer portion. Lamination is made by cold-cladding layer elements after irradiating any one of layer elements with laser beam to produce strong bonding through uniform microcrack formed in the hardened layer portion of several micrometer thick. The clad sheets are useful for making IC lead frames, for which the substrate is conductor metal and the cladding layer is solder applied to partial area of the substrate. The irradiation and cladding process is carried out continuously with a reduced draft.

Abstract: A clad sheet comprising a metal substrate and a metal cladding layer laminated on at least one surface of said substrate, wherein said cladding layer-laminated surface of said substrate includes a hardened layer portion formed by melting and rapid solidification through laser beam irradiation. In intermediate layer may be interposed between the substrate and the cladding layer through like hardened layer portion. Lamination is made by cold-cladding layer elements after irradiating any one of layer elements with laser beam to produce strong bonding through uniform microcrack formed in the hardened layer portion of several micrometer thick. The clad sheets are useful for making IC lead frames, for which the substrate is conductor metal and the cladding layer is solder applied to partial area of the substrate. The irradiation and cladding process is carried out continuously with a reduced draft.

Abstract: The tendons of a tension leg platform (TLP) used for producing petroleum offshore at a depth of 400-1000 m are protected against fatigue corrosion which mainly determines the life of the tendons.The straight steel pipes (1) have an insulative, corrosion-protection coating (8) having good damage resistance. The screw couplings (2) have a sprayed aluminum layer (9) having the ends contiguous to the ends of the insulative, corrosion-protection, and a galvanic current anode (5) is electrically connected to the screw coupling (2).