Patent ID: 8094463
Filing Date: 2012-01-10
Classification: H03H

Abstract:
1. A crystal oscillator for surface mounting comprising: a case main body, which includes concave portions on both principal surfaces thereof, and which is formed into a rectangular shape in a plan view; a crystal element that is hermetically encapsulated in one concave portion of the case main body; an IC chip that is housed in the other concave portion of the case main body; mounting terminals provided on four corner portions of an opening end face that is an outer bottom face of the other concave portion; and a protrusion, which serves as identifying marks along a direction of sides of the case main body, and which is provided in some of the mounting terminals, wherein the mounting terminals, to which the protrusions are provided, are provided on both corner portions on one end side of the case main body, wherein the protrusions extend in a same direction from the mounting terminals, which are provided on the corner portions, at an inner circumference side or an outer circumference side of the opening end face, and wherein the mounting terminals, to which the protrusions are provided, are symmetric with respect to a center line between both corner portions on the one end side.