Toppan Printing Co., Ltd.

Kiyotomo Nakamura

Fusao Takagi

Risaburo Yoshida

Akitsu Ota

Mitsuaki Taguchi

An electronic component includes a glass base in which through holes are formed passing through both surfaces thereof; an insulating resin layer laminated on each of both surfaces of the glass base and including a copper plated layer formed therein; and a capacitor including a lower electrode formed on the copper plated layer, a dielectric layer laminated on the lower electrode, and an upper electrode laminated on the dielectric layer. In the electronic component, the upper electrode has a region that is parallel to the copper plated layer and is formed so as to be smaller than a region of the dielectric layer parallel to the surface of the copper plated layer or a region of the lower electrode parallel to the surface of the copper plated layer.

Electronic component and method of producing electronic component

A process for producing a printed wiring board, comprising the steps of forming a photosensitive resist layer on a copper layer provided on an insulating substrate, patterning the photosensitive resist layer, and etching the copper layer made bare from the photosensitive resist layer to form a copper wiring layer, wherein the surface of the copper layer is subjected to pretreatment comprising the steps of black-oxide treating the surface by the use of an alkaline oxidizing solution and subsequently finely surface-roughening the black-oxide treated surface by the use of an acidic treating solution comprised of phosphoric acid or an organic acid, followed by drying in the presence of oxygen, and thereafter the photosensitive resist layer is formed thereon. Such pretreatment enables formation of fine and uniform roughness on the copper layer surface to bring about an improvement in its adhesion to the resist layer, so that ethcing solutions can be prevented from penetrating the interface between these layers. The drying step causes the copper layer surface to undergo oxidation to decrease reflectance on its surface, so that it is possible to prevent pattern disorder of photosensitive regions during patternwise exposure.

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Tokyo, Japan

Kiyotomo Nakamura