| 摘要 |
<p>PURPOSE:To increase heat-dissipating properties and strength, and to improve reliability by adopting a base plate with an element mounting region and a heat-dissipating region. CONSTITUTION:A base plate 20 consisting of ceramics is constituted by an element mounting region 21 and a heat-dissipating region 22 surrounding the region 21. The element mounting region 21 is formed by ceramics such as alumina having excellent heat-dissipating properties and printing properties. The heat-dissipating region 22 is shaped by ceramics having high mechanical strength against impact force, etc. such as zirconia having high purity. The strength of the heat-dissipating region 22 is set at a value of not less than twice as high as the elements 23 are fitted onto the element mounting region 21. A groove 24 is formed so as to surround the element mounting region 21 in the heat-dissipating region 22. A resin vesel 25, an upper section thereof is opened, is fitted to the groove 24. The resin vessel 25 is fixed by a resin 26 applied to a fitting section.</p> |
