Abstract: An interconnect substrate includes a pad for external connection and an insulating layer, wherein a portion of a lower surface of the pad is covered with the insulating layer, wherein an upper surface of the pad is situated at a lower position than an upper surface of the insulating layer, and wherein a groove whose bottom surface is formed by the insulating layer is formed around the pad in a plan view, and has an opening on an upper surface side of the insulating layer.

Abstract: A wiring board includes a pad configured to make an external electrical connection, and an insulating layer. A portion of a lower surface of the pad is covered with the insulating layer. The pad includes a base portion, and an extending portion formed integrally with the base portion and extending toward an outer periphery of a side surface of the base portion in a plan view at a lower end of the side surface of the base portion. The insulating layer is provided with a groove that is located in a periphery of the pad in the plan view, exposes a side surface of the pad, and opens to an upper surface of the insulating layer.

Abstract: A wiring board includes: a wiring layer; an insulating layer laminated on the wiring layer; an opening portion penetrating through the insulating layer to the wiring layer; a recess portion formed in a surface of the wiring layer exposed from the opening portion of the insulating layer; and a conductor film formed in the opening portion of the insulating layer and the recess portion of the wiring layer, wherein the recess portion of the wiring layer includes a raised portion, which is raised higher than an outer peripheral portion of a bottom surface, at a central portion of the bottom surface.

Abstract: An insulating layer containing fillers is formed to cover a first wiring layer. An opening portion, in which the first wiring layer is exposed, is formed in the insulating layer. A first alkali treatment, an ultrasonic cleaning treatment, and a second alkali treatment are sequentially performed on an upper surface of the insulating layer, on an inner wall surface of the opening portion, and an upper surface of the first wiring layer exposed in the opening portion. A second wiring layer electrically connected to the first wiring layer is formed by filling the opening portion by plating. The second wiring layer extends from an inside of the opening portion to the upper surface of the insulating layer.

Abstract: An insulating layer containing fillers is formed to cover a first wiring layer. An opening portion, in which the first wiring layer is exposed, is formed in the insulating layer. A first alkali treatment, an ultrasonic cleaning treatment, and a second alkali treatment are sequentially performed on an upper surface of the insulating layer, on an inner wall surface of the opening portion, and an upper surface of the first wiring layer exposed in the opening portion. A second wiring layer electrically connected to the first wiring layer is formed by filling the opening portion by plating. The second wiring layer extends from an inside of the opening portion to the upper surface of the insulating layer.

Abstract: An insulating layer containing fillers is formed to cover a first wiring layer. An opening portion, in which the first wiring layer is exposed, is formed in the insulating layer. A first alkali treatment, an ultrasonic cleaning treatment, and a second alkali treatment are sequentially performed on an upper surface of the insulating layer, on an inner wall surface of the opening portion, and an upper surface of the first wiring layer exposed in the opening portion. A second wiring layer electrically connected to the first wiring layer is formed by filling the opening portion by plating. The second wiring layer extends from an inside of the opening portion to the upper surface of the insulating layer.

Abstract: A method of manufacturing a wiring board, includes forming an interconnect layer on a first insulating layer, roughening a surface of the interconnect layer, not in contact with the first insulating layer, to form concavo-convex portions, forming a bond enhancing film on the concavo-convex portions, partially removing the bond enhancing film, using an acid solution, and forming a second insulating layer on the first insulating layer, to cover the interconnect layer.

Abstract: A method of manufacturing a wiring board, includes forming an interconnect layer on a first insulating layer, roughening a surface of the interconnect layer, not in contact with the first insulating layer, to form concavo-convex portions, forming a bond enhancing film on the concavo-convex portions, partially removing the bond enhancing film, using an acid solution, and forming a second insulating layer on the first insulating layer, to cover the interconnect layer.

Abstract: An insulating layer containing fillers is formed to cover a first wiring layer. An opening portion, in which the first wiring layer is exposed, is formed in the insulating layer. A first alkali treatment, an ultrasonic cleaning treatment, and a second alkali treatment are sequentially performed on an upper surface of the insulating layer, on an inner wall surface of the opening portion, and an upper surface of the first wiring layer exposed in the opening portion. A second wiring layer electrically connected to the first wiring layer is formed by filling the opening portion by plating. The second wiring layer extends from an inside of the opening portion to the upper surface of the insulating layer.

Abstract: A wiring substrate include a pad, an insulation layer having an opening arranged on the pad, a metal post including a seed layer and a metal plated layer, the seed layer arranged on the pad and an upper surface of the insulation layer, the metal plated layer arranged on the seed layer, and a connection metal layer formed on the metal plated layer. A side surface of the metal plated layer has a concave surface recessed inward from a lower end of the connection metal layer. A side surface of the seed layer is recessed inward from a lower end of the metal plated layer.

Abstract: A wiring substrate include a pad, an insulation layer having an opening arranged on the pad, a metal post including a seed layer and a metal plated layer, the seed layer arranged on the pad and an upper surface of the insulation layer, the metal plated layer arranged on the seed layer, and a connection metal layer formed on the metal plated layer. A side surface of the metal plated layer has a concave surface recessed inward from a lower end of the connection metal layer. A side surface of the seed layer is recessed inward from a lower end of the metal plated layer.

Abstract: A wiring substrate includes a wiring layer, an insulating layer covering the wiring layer, and a protruding electrode including a protruding metal layer and a surface metal layer. The protruding metal layer is connected to the wiring layer in an opening of the insulating layer, extends from within the opening to be stepped at the edge of the opening to extend outward onto the insulating layer, and includes a first surface contacting a surface of the insulating layer around the opening, a second surface, and a peripheral surface extending between the first and second surfaces, and bent inward to form a space between the peripheral surface and the surface of the insulating layer. The surface metal layer covers the protruding metal layer without contacting the surface of the insulating layer, and is formed of a metal having a lower melting point than the protruding metal layer.

Abstract: A terminal structure of a wiring substrate includes a wiring layer, a protective insulation layer including an opening that partially exposes an upper surface of the wiring layer, and a connection terminal formed on the wiring layer. The connection terminal includes a base portion formed in the opening and a connection portion formed on the base portion. The connection portion projects from an upper surface of the protective insulation layer. A gap is formed between a side surface of the base portion and a wall surface of the opening.

Abstract: A wiring board includes: an insulating layer; a pad including: an upper surface; a lower surface opposite to the upper surface; and a side surface between the upper surface and the lower surface, wherein the side surface and the lower surface of the pad are embedded in the insulating layer; and a metal post formed on the upper surface of the pad and including: an upper surface; a lower surface opposite to the upper surface; and a side surface between the upper surface and the lower surface, wherein a narrowed portion is formed in the side surface of the metal post.

Abstract: A wiring board includes an insulating layer; and a wiring layer embedded in the insulating layer at one surface side of the insulating layer, one surface of the wiring layer being exposed from one surface of the insulating layer, the wiring layer including a first portion and a second portion whose width is wider than that of the first portion, one surface of the first portion and one surface of the second portion being flush with each other, and the first portion being thinner than the second portion.

Abstract: A terminal structure of a wiring substrate includes a wiring layer, a protective insulation layer including an opening that partially exposes an upper surface of the wiring layer, and a connection terminal formed on the wiring layer. The connection terminal includes a base portion formed in the opening and a connection portion formed on the base portion. The connection portion projects from an upper surface of the protective insulation layer. A gap is formed between a side surface of the base portion and a wall surface of the opening.

Abstract: A wiring board includes: an insulating layer; a pad including: an upper surface; a lower surface opposite to the upper surface; and a side surface between the upper surface and the lower surface, wherein the side surface and the lower surface of the pad are embedded in the insulating layer; and a metal post formed on the upper surface of the pad and including: an upper surface; a lower surface opposite to the upper surface; and a side surface between the upper surface and the lower surface, wherein a narrowed portion is formed in the side surface of the metal post.

Abstract: A wiring board includes an insulating layer; and a wiring layer embedded in the insulating layer at one surface side of the insulating layer, one surface of the wiring layer being exposed from one surface of the insulating layer, the wiring layer including a first portion and a second portion whose width is wider than that of the first portion, one surface of the first portion and one surface of the second portion being flush with each other, and the first portion being thinner than the second portion.

Abstract: A wiring board includes a core layer, a through-hole penetrating through the core layer in its thickness direction, a first wiring layer formed on a first surface of the core layer, a through-hole wiring formed in the through-hole and electrically connected to the first wiring layer, and a curved first chamfered portion formed in a boundary portion between an inner side surface of the through-hole and the first surface of the core layer. The first wiring layer includes a first metal layer formed outside the first chamfered portion on the first surface of the core layer and a second metal layer formed on the first chamfered portion and the first metal layer.

Abstract: A wiring substrate includes a first insulating layer formed as an outermost layer on one surface side, and exhibiting a black color or a gray color, a first connection pad formed to expose from the first insulating layer, a second insulating layer formed as an outermost layer on another surface side, and exhibiting a black color or a gray color, and a second connection pad formed to expose from the second insulating layer, wherein a connection hole having a side wall surface formed like a curved surface is formed in the second insulating layer, and the second connection pad is exposed to a bottom part of the connection hole.