Disclosed are a core sheet and a manufacturing method thereof. The core sheet has an annular core back portion and a plurality of tooth portions extending from the core back portion toward a radial center thereof. The core sheet is obtained by performing a blanking step, a rolling step and a removing step. In the removing step, an insulation coating, which is on a region of a grain-oriented magnetic steel sheet for forming a band-shaped core back portion, on a band-shaped core back portion of a sheet piece or on the core back portion of the core sheet, is at least partially removed.

A wound core is formed by laminating a plurality of bent bodies formed from a grain-oriented electrical steel sheet having a coating containing phosphorus formed on a surface, in a sheet thickness direction of the grain-oriented electrical steel sheet, in which the bent body is formed in a rectangular shape by having four flat portions and four corner portions adjacent to the flat portions, the corner portion has a bent region having a total bending angle of approximately 90 in a side view, the number of deformation twins present in the bent region in the side view is five or less per 1 mm of a length of a center line in the bent region in the sheet thickness direction, and the amount of phosphorus eluted from the corner portion in a case of being boiled in water for 30 minutes is 6.0 mg or less per 1 m.sup.2 of a surface area of the corner portion.

A method for producing a pair of electrically conductive members assembled into an electrical component assembly provided with a coil. The method includes: forming connection terminal sections provided in the pair of electrically conductive members by arranging them alternately opposite to each other and then performing press punching; and after the press punching, bending the connection terminal sections in the pair of electrically conductive members toward a side departing from the coil into a protruding form.

A metal laminate includes a lamination of a first metal plate and a second metal plate. The first metal plate includes a caulking that exhibits a mountain shape protruding from a back surface side and recessed on a front surface side, and the second metal plate includes an accommodating portion configured to accommodate the caulking such that the caulking is fitted to the accommodating portion. The caulking includes a recessed portion provided on an inner concave surface of the caulking and recessed toward the back surface side of the first metal plate, and an abutting portion provided on an outer convex surface of the caulking and abutted against an inner surface of the accommodating portion at a position corresponding to the recessed portion. The abutting portion expands laterally from the outer convex surface toward the inner surface of the accommodating portion.

A method of manufacturing a thin film inductor includes preparing a carrier film having a first surface on which a first upper separation layer is formed and a second surface on which a first lower separation layer is formed. A first upper layer, including a first upper coil pattern and a first upper insulating pattern, is formed on the first surface. A first lower layer, including a first lower coil pattern and a first lower insulating pattern, is formed on the second surface. A surface of the first upper layer is ground. A height of the first lower coil pattern is smaller than that of the first lower insulating pattern.

A method for manufacturing a separable electromagnetic inductive apparatus is provided. The method for manufacturing a separable electromagnetic inductive apparatus comprises a winding step for winding a steel plate composed of a rolled amorphous magnetic alloy to a circular shape to form a magnetic core; a heat treating and an impregnating step for heat treating and impregnating the wound magnetic core without adding cobalt; a cutting step for cutting the heat treated and impregnated magnetic core to an orthogonal direction to the wound direction of the magnetic core; and a polishing step for polishing the cut surface having a three-dimensional plane of the cut surface of the magnetic core evenly arranged in a fixed state.

A method for manufacturing a separable electromagnetic inductive apparatus is provided. The method for manufacturing a separable electromagnetic inductive apparatus comprises a winding step for winding a steel plate composed of a rolled amorphous magnetic alloy to a circular shape to form a magnetic core; a heat treating and an impregnating step for heat treating and impregnating the wound magnetic core without adding cobalt; a cutting step for cutting the heat treated and impregnated magnetic core to an orthogonal direction to the wound direction of the magnetic core; and a polishing step for polishing the cut surface having a three-dimensional plane of the cut surface of the magnetic core evenly arranged in a fixed state.

When joining end faces of a plurality of soft magnetic sheets which are superposed in the sheet thickness direction and which are bent at parts forming corner areas of a core, offset of positions of the end faces from the desired positions is suppressed.

In a region of a window part comprised of a region inside of a first part 110 and second part 120, a third part 130 with a length in a longitudinal direction (X-axial direction) the same as a length in the X-axial direction of the window part at the position where the third part 130 is arranged is arranged so as to contact the region of the inner circumferential surface between the first corner area 101 and third corner area 103.

To prevent an adhesive agent from adhering to a die set for outer shape punching and avoid contamination of the die set by the adhesive agent even if the adhesive agent protrudes from the outer shape contour of a laminated iron core, a laminated iron core manufacturing device includes: a first punch (32) and a first die (48) for punching a part of an outer shape of each iron core lamina in a sheet steel strip; an adhesive agent applying apparatus (60) configured to apply an adhesive agent on an adhesive agent application region including a portion defined in the sheet steel strip by punching by the first punch (32) and the first die 48; and a second punch (34) and a second die (50) configured to punch the outer shape of each iron core lamina other than the part punched by the first punch (32) and the first die (48) from the sheet steel strip.

A punching method with a favorable punchability with respect to amorphous metal thin ribbons, an amorphous metal thin strip produced by the method, and a laminated core, are provided. The amorphous metal thin strip has a thickness of from more than 30 ?m to 50 ?m, and a side configured by a punched surface on which at least a shear droop, a shearing surface, and a fractured surface are observed, the width of the shear droop relative to the thickness of the metal thin strip being 30% or less at the side.