Printing wiring board and assembly of the same

摘要

A printed wiring board (PWB) and assembly are described which are suitable for high density mounting of an electronic component and which can provide a thin and light assembly. A recess (10) is formed in one part of a PWB (1) and components (4, 4') are received in this recess (10). The components (4, 4') are lower than the surface of the PWB (1). A conductive pad (3) is provided to the bottom of the recess (10) and a connecting terminal (4a) and the conductive pad (3) are electrically connected by using a solder ball (11) or a conductive adhesive material. The recess (10) is formed by partially removing one or more layers of plural conductive layers and insulating layers which make up the multilayer PWB (1).