title: Observations of vibration shape of AT-cut quartz resonator including electric twins.
abstract: Quartz crystal resonators, including electric twins, are investigated. Electric twins are artificially formed in the usual AT-cut quartz crystal resonantor before the deposition of electrodes. We have directly observed that vibrations generated at electrodes propagate into the outside region isotropically, but cannot propagate into the region of electric twin.
authors.forename: E
authors.initials: E
authors.lastname: Kamiyama
authors.forename: T
authors.initials: T
authors.lastname: Itoh
authors.forename: Y
authors.initials: Y
authors.lastname: Murakami
authors.forename: Y
authors.initials: Y
authors.lastname: Ueoka