Patent ID: 8056198

Claim:
A method of manufacturing an electronic device, comprising: providing a master substrate comprising a plurality of substrate areas; providing a plurality of piezoelectric oscillation elements, each of which is arranged in each of the substrate areas of the master substrate; providing a main cover which is apart and independent from the master substrate; joining the main cover and the master substrate in such a manner that each of the piezoelectric oscillation elements is sealed between the main cover and the master substrate; and separating the master substrate and the main cover that are joined to each other along a boundary portion between the substrate areas to obtain a plurality of electronic devices, wherein each of the substrate areas of the master substrate comprises a recess serving as a sealed space of the piezoelectric oscillation element, wherein the main cover and the master substrate are joined with a joining material, wherein in a state before separating the master substrate and the main cover, the master substrate further comprises a separated area to be separated between substrate areas adjacent to each other, and a space in the separated area comprises a non-joining portion space where the master substrate and the main cover are not joined to each other, and wherein a height of the non-joining portion space is smaller than a depth of the recess.