Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
Heat spreader and method of making the same
 Provided are a heat spreader that can reduce an increase in the thermal expansion coefficient up to high temperatures of not lower than 500.degree. C. and has an excellent thermal expansion property and an adequate heat-conductive property and a method of making the same. This heat spreader comprises high-thermal-conductivity layers made of a Cu-base metal, low-thermal-expansion layers made of an Fe--Ni-base alloy each of which layers is provided with a plurality of through holes, and thermal expansion-restraining layers of a metal with a thermal expansion coefficient .alpha. at 30-800.degree. C. of not more than 7.5.times.10.sup.-6 /.degree. C. 
Hitachi Metals, Ltd.
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Ichiro Shingo Hironori Hideya
Kishigami Kumamoto Nakanishi Yamada