Patent ID: 9331006
Filing Date: 2016-05-03
CPC Classification: B81B,H01L

Claim Text:
1. A semiconductor device comprising: a substrate made of a semiconductor material and including a main surface formed with a recess; a wiring layer formed on the substrate; and three direction sensor elements disposed in the recess and having respective detection reference axes along mutually different directions, wherein the recess includes a first hollow and a second hollow, the first hollow accommodating the three direction sensor elements and including a first bottom surface and a first inclined side surface, the second hollow including a second bottom surface and a second inclined side surface, the second bottom surface connecting to the first inclined side surface, the second inclined side surface connecting to the second bottom surface and the main surface, the substrate is made of a monocrystal silicon, the main surface is a (100) surface, the first inclined side surface includes two first inclined faces spaced apart from each other with the first bottom surface disposed between them, the first hollow including two first upright side surfaces perpendicular to the first bottom surface and spaced apart from each other with the first bottom surface disposed between them, the second inclined side surface includes two second inclined faces spaced apart from each other with the second bottom surface disposed between them, the second hollow including two second upright side surfaces perpendicular to the second bottom surface and spaced apart from each other with the second bottom surface disposed between them, the semiconductor device further comprising an acceleration sensor element for acceleration detection in three mutually different directions, and the acceleration sensor element is accommodated in the first hollow.