Patent ID: 7939995

Claim:
A packaged piezoelectric resonator comprising: (i) a case with a flat bottom, four sides and a lid; and (ii) a piezoelectric resonator element housed inside the case under vacuum, wherein the piezoelectric resonator element includes: (a) a planar tuning-fork-shaped part with two parallel vibrating arms connected to each other by a linking part; and (b) an attachment arm extending from the linking part along the plane of the planar tuning-fork-shaped part, wherein the attachment arm is fixedly attached to the bottom of the case through at least one attachment point, and at least a main portion of the attachment arm is arranged in between the vibrating arms, parallel and side by side with the vibrating arms, wherein the inside surface of the lid is stepped in such a way as to form a first portion where the lid has a first thickness and a second portion where the lid has a second thickness substantially greater than the first thickness, wherein the first portion extends at least over distal end portions of the vibrating arms, and the second portion extends over a part of the attachment arm, and wherein the second portion rests on the attachment arm.