Ibiden Company Limited

Hiroyasu Noto

Yoshinori Takenaka

Kentaro Wada

A wiring substrate includes a core substrate, and a build-up part laminated on the substrate and including resin insulating layers. The insulating layers include a first insulating layer, the build-up part includes a conductor layer on the first insulating layer, a second insulating layer on the first insulating layer and covering the conductor layer, and a recess penetrating through the second insulating layer and exposing portion of the conductor layer such that the conductor layer includes component mounting region that places an electronic component in the recess and a conductor pad forming bottom surface of the recess, the insulating layers include inorganic filler such that all insulating layers or all insulating layers other than the first insulating layer include the inorganic filler and that inorganic filler content rate of the first insulating layer is lower than inorganic filler content rate of the insulating layers other than the first insulating layer.

Wiring substrate and component built-in wiring substrate

A printed wiring board includes a first conductor layer including a first conductor circuit and a second conductor circuit formed adjacent to the first conductor circuit, a resin insulating layer formed on the first conductor layer such that the insulating layer is filling space between the first and second conductor circuits, and a second conductor layer formed on the insulating layer such that the insulating layer is interposed between the first and second conductor layers. The first conductor layer has thickness in the range of 1 &#x3bc;m to 15 &#x3bc;m and is formed such that the space between the first and second conductor circuits has width in the range of 2 &#x3bc;m to 7 &#x3bc;m, and the insulating layer includes inorganic particles having average particle diameter in the range of 0.05 &#x3bc;m to 1.0 &#x3bc;m and content in the range of 35 wt. % to 75 wt. % in the insulating layer.

Printed wiring board

A printed wiring board includes a first conductor layer including a first conductor circuit and a second conductor circuit formed adjacent to the first circuit, a resin insulating layer formed on the first conductor layer such that the insulating layer is filling space between the first and second conductor circuits, and a second conductor layer formed on the insulating layer such that distance (T) between the first and second conductor layers is in the range of 4.5 &#x3bc;m to 10.5 &#x3bc;m. The resin insulating layer includes inorganic particles having average particle diameter (D) such that ratio (D/S) of the diameter (D) to distance (S) of the space is less than 0.25 and that ratio (D/T) of the diameter (D) to the distance (T) is less than 0.25, where the distance (S) of the space between the first and second conductor circuits is in the range of 4.5 &#x3bc;m to 10.5.

A wiring board includes an insulating resin layer including resin material and filler, and a conductive circuit layer laminated on a surface of the insulating resin layer and having wiring patterns. The filler has particle diameters of 15% or less of a minimum width of the wiring patterns when the particle diameters of the filler is measured in a unit range defined such that the unit range has a width and a length where the length is measured from the surface of the insulating resin layer and is selected from a smaller of twice the minimum width of the wiring patterns and a plate thickness of the insulating resin layer, and the width is twice the minimum width of the wiring patterns.

Growing community of inventors

Ogaki, Japan

Hiroyasu Noto