A component includes a magnetic core having a body formed of a first material, defining a first opening and a second opening thereon. A duct formed of a second material extends at least partially through the body between the first opening and the second opening. The first opening and the second opening are in fluid communication by way of the duct.

An inductor includes a support having first and second coils formed on first and second surfaces thereof, respectively; a body embedding the support therein so that end portions of the first and second coils are exposed through first and second surfaces of the body opposing each other, and including a first magnetic part disposed in cores of the first and second coils and on upper and lower surfaces of the first and second coils, respectively, and second magnetic parts disposed on upper and lower surfaces of the first magnetic part, respectively; and first and second external electrodes formed on outer surfaces of the body to be electrically connected to the end portions of the first and second coils, respectively. The second magnetic part has a content of a hardening accelerator greater than that of the first magnetic part.

In manufacturing a laminated iron core by laminating and bonding iron core laminates blanked from a sheet steel strip into a prescribed profile, the adhesive agent can be applied to the iron core laminates in a stable manner without regard to the arrangement and the number of the application spots on each iron core laminate. The metallic die machine (1) is provided with an adhesive agent application unit (12) configured to apply an adhesive agent to a prescribed area of the sheet steel strip (W) corresponding to the iron core laminates (2), and the adhesive agent application unit is provided with a casing (44) defining a plurality of adhesive agent storage chambers (55-57) for storing the adhesive agent before the adhesive agent is applied to the prescribed area. The casing is provided with a plurality of ejection orifices (H1 to H3) each communicating with a corresponding one of the adhesive agent storage chambers and configured to eject the adhesive agent.

A coil electronic component includes a body and external terminals. The body includes a winding coil part and a pillar-shaped core part inserted inside of the winding coil part and formed of a magnetic metal. The external terminals are connected to the winding coil part and disposed on an external surface of the body. The body contains the magnetic metal and a resin, and the pillar-shaped core part has magnetic permeability higher than that of a portion of the body disposed outside of the winding coil part.

A manufacturing method for laminated iron cores includes processing a metal sheet to form product sheets, in each of which iron core pieces are arranged inside an outer frame piece and the iron core pieces are connected to the outer frame piece in such a way that outer peripheral sides of the iron core pieces are connected to nearest parts of the outer frame piece through bridge pieces, laminating the product sheets and temporarily fixing the product sheets adjacent to each other in a vertical direction together to form a sheets laminated body including iron core pieces laminated parts and bridge pieces laminated parts, sealing the iron core pieces laminated parts by a resin while being pressurized to form pre-formed laminated iron cores, and separating the bridge pieces laminated parts from the pre-formed laminated iron cores to form the laminated iron cores which are individually separated.

An iron core (1, 11, 31) for a stationary induction apparatus according to one embodiment is configured by laminating a plurality of electromagnetic steel plates (5, 16, 33). The electromagnetic steel plates are laminated so that joint parts (6, 17, 18, 32), at which the end portions of the electromagnetic steel plates abut one another, are disposed in a staggered manner; and the electromagnetic steel plates are provided with a magnetic domain fine differentiation processed part (7, 19, 34), which is located on the portion, of a surface of the end portion of each of the electromagnetic steel plates, lapped with the joint part of another electromagnetic steel plate, and which has been subjected to warping-derived magnetic domain fine differentiation.

An adhesively-laminated core for a stator capable of suppressing an iron loss of an electric motor and also having excellent productivity is provided. The adhesively-laminated core for a stator includes a plurality of electrical steel sheets which are stacked on one another and of which both surfaces are coated with insulation coatings, and adhesion parts which are disposed between the electrical steel sheets adjacent to each other in a stacking direction and cause the electrical steel sheets to be adhered to each other. All sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered via the adhesion parts. An adhesive forming the adhesion parts is a two-agent type acrylic-based adhesive (SGA) which includes an acrylic-based compound, an oxidizer, and a reducer and in which a portion of the acrylic-based compound and the oxidizer are assigned to a first agent and the remaining portion of the acrylic-based compound and the reducer are assigned to a second agent. The adhesion parts are partially provided between the electrical steel sheets adjacent to each other in the stacking direction.

A manufacturing method of a grain-oriented electrical steel sheet according to an embodiment of the present invention includes producing a cold-rolled plate; forming a groove in the cold-rolled plate; performing primary recrystallization annealing to the cold-rolled plate; and applying an annealing separator to the primary-recrystallized cold-rolled plate and performing secondary recrystallization annealing, wherein a weight ratio of SiO.sub.2/Fe.sub.xSiO.sub.y of the surface layer part of the cold-rolled plate is 0.3 to 3 after the primary recrystallization annealing of the cold-rolled plate. (Here, x is an integer from 1 to 2, and y is an integer from 2 to 4.)

An electrode structure on a circuit board, the electrode structure comprising a metal structure disposed on and electrically connected to the circuit board, wherein the metal structure and a surface of the circuit board forms a space therebetween, wherein at least one first electrical component is disposed in the space and an outer surface of the metal structure forms an electrode for electrically connecting with an external component.

A multilayer body includes laminated ceramic sheets. An IC and passive elements are mounted on a top surface of the multilayer body, and cavities are provided in side surfaces of the multilayer body. Bonding electrodes are provided in bottom surfaces of the cavities. A sealing resin is provided on the top surface of the multilayer body to seal the IC and the passive elements, and extends into the cavities to seal the bonding electrodes.