Patent ID: 8339800

Claim:
A circuit module comprising: a substrate; a component land provided on the substrate; an electronic component bonded to the component land; a case land provided on the substrate; and a case bonded to the case land and arranged so as to cover the electronic component; wherein the case includes a top plate, and a plurality of legs that extend from a peripheral edge of the top plate in a direction substantially perpendicular to the top plate and each of the plurality of legs includes a groove in an end surface thereof that is bonded to the case land; the case land is substantially planar and includes a main surface that is substantially parallel to a main surface of the substrate; the end surface of the plurality of legs have different areas; and a width of the groove provided in a first leg of the plurality of the legs including the end surface with a larger area is greater than a width of the groove provided in a second leg of the plurality of legs including the end surface with a smaller area.