Hitachi, Ltd.

Jiro Kusuhara

Terumine Hayashi

Toru Nakamura

Mitsugu Edagawa

Hiromi Tanaka

Yasuyuki Fujihara

Yutaka Sekiyama

Hideharu Ohtomo

In order to determine the routes of wiring connections on a multi-layer circuit board, to form a suitable wiring pattern without local congestions of the wiring connections, the wiring region of the circuit board is considered as one or more areas. For each area, a preferred wiring direction is determined for each layer of the circuit board. Those preferred directions for the layers may be determined by proposing initial preferred wiring directions for each layer, determining whether there is congestion of the wiring connections in any area, and changing the wiring direction for one or more layers of such an area to reduce the congestion. Alternatively, the wiring directions can be determined for each layer without there being an initial wiring direction which is common to all areas. Furthermore, an excess number value may be obtained, which is the sum by which the desired number of wiring connections of an area exceed a predetermined value, for a series of candidate wiring directions of the layers of the area, and then the candidate is selected which has the minimum excess value.

Method of determining routes for a plurality of wiring connections and a

A method of wiring electronic parts by a printed circuit board is provided. According to the method, electronic parts having pins arranged at intervals unmatched to a predetermined grid resolution are placed on the printed circuit board and the desired pins of the electronic parts are electrically connected by the printed circuit board. The characteristic of the method resides in that wiring pins are each provided at the same relative channel position within a unit grid portion located in the vicinity of each of the pins of the electronic parts so that the pins of the electronic parts are electrically connected to one another through the wiring pins.

Printed circuit board wiring method

Growing community of inventors

Hatano, Japan

Jiro Kusuhara