| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a thermal conductivity calculating system capable of calculating the thermal conductivity of an accurate electronic board reflecting anisotropy even if the orientation of the wiring of a wiring layer is anisotropic. <P>SOLUTION: Board thermal conductivity is calculated in consideration of a wiring area rate and a wiring direction. Information for the electronic board including the information of a board shape of the electronic board having wiring layers, a wiring shape in the wiring layer, and a material forming the electronic board is obtained in information obtaining portions 11, 12, and D1. The board shape of the electronic board is divided into small zones in a board zone dividing portion 13. The wiring layers in the small zone are sampled for every divided small zone, and wiring patterns for every wiring layer of the sampled small zones are distinguished each other and are classified into each pattern in a pattern classifying portion (14). A wiring area rate for every wiring layer of the small zone is calculated in a wiring area rate calculating portion (15). Equivalent thermal conductivity for every wiring layer of the small zone is calculated based on a pattern sampled result and a wiring area rate for every wiring layer of the small zone in a wiring layer thermal conductivity calculating portion (16). Equivalent thermal conductivity for every small zone is calculated based on calculating results of thermal conductivity for every wiring layer of the small zone in an equivalent thermal conductivity calculating portion (17). <P>COPYRIGHT: (C)2004,JPO&NCIPI |
