| 摘要 |
<p>PURPOSE:To avoid or reduce the possibility of forming a heat generating part internally by providing a constitution in which a groove is prepared extending along the end at one or both sides of a substrate and a heat sink. CONSTITUTION:When a heat sink 6 is permitted to stick to the back face of a substrate 1 with an adhesive 7, a groove 8 extending along an end face 1a is cut at an area of the end face 1a on the substrate 1 with regard to the back face 1 of the substrate. Consequently, if an unnecessary part of the adhesive 7 sandwiched between the bonded faces of the substrate 1 and the heat sink 6 were crowded out toward the end face 1a of the substrate 1, this unnecessary part would be confined to only the interior of the groove 8 to fully fill the groove 8. Thus it is possible to reduce the possibility of or prevent the unnecessary part of the adhesive being crowded out in a protruded form to the exterior from the face end 1a. So a distance (L) from the end face 1a at the tip of the substrate 1 to a heat generating part 5 does not increase.</p> |
