PRINTED WIRING BOARD, PRINTED WIRING BOARD MODULE, OPTICAL COMMUNICATION MODULE, OPTICAL COMMUNICATION DEVICE AND ARITHMETIC PROCESSING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a printed wiring board suppressing unexpected reduction of impedance if position deviation between a layer having a signal conductor and a GND plane layer occurs.

SOLUTION: The printed wiring board includes: a signal conductor 11 including a heating terminal 11c electrically connected to a rigid substrate 2, a wiring portion 11b having a narrower width than the heating terminal 11c, and a connection portion 11a connected to the heating terminal 11c and to the wiring portion 11b and having a gradually varying width; and a GND plane layer, which is a layer other than a layer having the formed wiring portion 11b, having a formed GND conductor 15 and including a hollow 17 produced by hollowing the GND conductor 15 at a portion corresponding to the connection portion 11a and the heating terminal 11c. A distance from a boundary portion between the connection portion 11a and the wiring portion 11b to the GND conductor 15 in the horizontal direction is equal to or greater than the thickness of a dielectric between the GND plane layer and the signal conductor 11.

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