Patent ID: 7857983
Filing Date: 2010-12-28
Classification: H03H,Y10T

Abstract:
1. A method for manufacturing a plurality of piezoelectric oscillating pieces including a base, a plurality of vibrating arms extending from the base, and grooves formed in these respective vibrating arms by etching a piezoelectric substrate, comprising the steps of: obtaining a piezoelectric oscillating piece which has an outside shape portion and grooves and wherein a front side and a rear side of said piece excepting said grooves are covered with a first metal film; forming a frequency adjustment region at a tip portion of said piezoelectric oscillating piece by forming a resist mask on the surface of said piezoelectric substrate that covers the first metal film at said tip portion and leaves exposed the first metal film at portions other than the tip portion, then removing the exposed other first metal film portions; forming an electrode by forming a second metal film on the whole surface of the outside shape portion of the piezoelectric oscillating piece, including on the first metal film remaining at the tip portion; forming a new resist mask on the surface of said second metal film to etch the second metal film so as to form an electrode pattern including said tip portion; removing said new resist mask; and adjusting the oscillation frequency of the piezoelectric oscillating piece by shaving at least the second metal film of said first and second metal films at the tip portion frequency adjustment region so as to adjust a thickness thereof.