Mounting for rod-like crystal oscillators

Claim 1

Mounting means for rod-like oscillators of the type wherein a housing base plate has connecting wires extending therethrough, an oscillator rod is arranged parallel with and between post extensions from the wires and connected to the post extensions by means of wire filament suspensors extending transversely to the axis of the rod and soldered to the electrode surfaces of the rod and to the post extensions, a drawn metal substantially cupshaped housing shell enveloping the rod and post extensions is connected to the base plate, and a disc having perforations for receiving the free ends of the post extensions includes circumferentially spaced projections on the perimeter thereof engaging the housing shell and maintaining the remainder of the perimeter of said disc in spaced relation to said housing shell, the improvement therein wherein: said disc comprises a punched thin laminate including an insulating core and bilateral metallic facings on said core; said metallic facings and the housing shell having like thermal coefficients of expansion and thus similarly respond to temperature change, the dimensioning of the metallic facings and the disc core being such that the temperature response of the metallic facings is forced upon the thin laminate so that the laminate expands or contracts with the metallic facings even though it has a different thermal coefficient; and each of said metallic facings including a pair of arcuate gaps concentric with respective ones of said perforations.