Patent ID: 7901587

Claim:
A manufacturing method for a vibrator having a groove portion on at least one surface thereof, comprising: a step of forming a metal film composed of an underlayer and a surface layer on a surface of a substrate made of a piezoelectric material; a step of spreading a photoresist on the surface layer of the metal film, thereby forming a photoresist layer thereon; a step of patterning the photoresist layer into an external shape of the vibrator, thereby removing first unnecessary parts of the photoresist layer; a step of etching away those parts of the surface layer which are exposed corresponding to the removed first unnecessary parts of the photoresist layer, thereby exposing the underlayer; then, after exposing the underlayer, a step of patterning the photoresist layer to remove second unnecessary parts of the photoresist layer without exfoliating the photoresist layer remaining on the surface layer, thereby exposing the surface layer corresponding to the groove portion; then, after exposing the surface layer corresponding to the groove portion, a step of etching away those parts of the underlayer which have so far been exposed in the preceding steps which correspond to the removed first unnecessary parts of the photoresist layer, thereby exposing the surface of the substrate; a step of etching away exposed parts of the substrate, thereby forming the external shape of the vibrator; a step of etching away those parts of the surface layer and the underlayer which correspond to the removed second unnecessary parts of the photoresist layer in the groove portion, thereby exposing the surface of the substrate; a step of etching the surface of the substrate exposed corresponding to the groove portion, thereby forming the groove portion; and a step of removing the remaining surface layer and the underlayer of the metal film.