Patent ID: 9123881
Filing Date: 2015-09-01
Classification: G01C,H01L

Abstract:
1. An electronic device comprising: a mounting component; a package which includes a base in which the mounting component is provided and houses the mounting component, the base has a main surface and a bottom surface, the base having a through hole provided from the main surface to the bottom surface in a position that overlaps with the mounting component in a plan view; a spacer which is provided between the mounting component and the base; a circular projection wall which is provided on the main surface of the base and which surrounds the through hole in the plan view; a plurality of projection walls which are provided on the main surface of the base of the package, the plurality of projection walls overlapping with the mounting component in the plan view and being spaced apart from each other, wherein the plurality of projection walls and the spacer create an air communication between the through hole and an inner space of the package, the plurality of projection walls are provided at an interval in a circumferential direction of the through hole in the plan view, a height of the circular projection wall is lower that a height of the spacer, and spacer, a height of each of the plurality of projection walls is higher than the height of the spacer, the plurality of projection walls include a first wall portion that is configured of a plurality of wall bodies that are provided at an interval in the circumferential direction of the through hole in the plan view, and a second wall portion that is provided inside the first wall portion and is configured of a plurality of wall bodies that are provided at an interval in the circumferential direction of the through hole in the plan view, at least one of the wall bodies of the first wall portion and the wall bodies of the second wall portion is disposed in a radius direction centered on the through hole in the plan view of the base, and the circular projection wall and the plurality of projection walls overlap to each other in directions parallel to the main surface of the base.