Patent ID: 8288925

Claim:
A method of manufacturing a quartz resonator element in which a thin film-shaped electrode is formed on a plate-shaped quartz piece to excite the quartz piece, the method comprising: forming a first metal layer that is composed of chromium and whose thickness is not less than 20 â„« nor more than 30 â„« on the surface of the plate-shaped quartz piece, the plate-shaped quartz piece being AT cut; forming a second metal layer that is composed of gold or silver and whose thickness is not less than 500 â„« nor more than 950 â„« on an upper surface of the first metal layer, and wherein said thin film-shaped electrode is made up of the first metal layer and the second metal layer; and heating the plate-shaped quartz piece on which the electrode is formed to a temperature range of not less than 300Â° C. nor more than 400Â° C., and diffusing the chromium composing the first metal layer into the second metal layer.