Abstract:
A piezoelectric device includes a piezoresonator body (3) having opposing first and second surfaces and opposing third and fourth surfaces. The device also includes at least one common electrode (8) disposed on the second surface ( 15) and electrodes (4a, 4b) disposed on the first surface ( 14) in pairs along a first longitudinal axis. The device further includes contact elements (5) disposed on the third (16) and the fourth ( 17) surfaces at contact locations along the First longitudinal axis and aligned between each pair of excitation electrodes, hi the device, the piezoelectric body has a first order natural resonance frequency (v 1) along a second longitudinal axis and an even order natural resonance frequency (v 2) along the first longitudinal axis, where a percent difference between v 1 and v 2 is greater than 0% and less than or equal to 20%.
Abstract:
This invention relates to a cylindrical piezoelectric device which makes fine movement as a result of arcuate motion caused by the extension and contraction of its pattern portion. The fine movement device makes push-pull driving by simultaneous extension and contraction in opposite directions caused by two electrodes, and is characterized in that the push-pull operation is attained with the same driving signal by reversing poling directions of both electrodes.
Abstract:
A multi-DOF piezoelectric actuator that may be constructed with sizes of about or less than one millimetre. The multi-DOF piezoelectric actuator is capable of generating motion of a rotor element or slider element, about or in, each of the three fundamental axes of three dimensional space. The actuator can comprise a piezoelectric element (10) having one or more sidefaces, a first endface, and a second endface, wherein at least one or more sidefaces comprise a plurality of separate sideface electrodes (11) and at least one of the first or second endfaces comprise an endface electrode (12). A transducer element (30,40) and isolation structure (5) for use in a piezoelectric actuator are also described.
Abstract:
Un dispositif de micropositionnement (100) d'un actionneur piézoélectrique (200) est divulgué. Le dispositif comprend : des moyens de commande d'un champ électrique appliqué audit actionneur piézoélectrique (200) de sorte à déformer le matériau piézoélectrique (201) et, des moyens de mesure simultanée d'une variation de charge électrique accumulée sur l'actionneur piézoélectrique (200) résultant de la déformation; et des moyens d'acquisition des mesures de la variation de charge électrique, de traitement de ces acquisitions et d'estimation d'un déplacement (x, y, z) de l'actionneur piézoélectrique (200) et/ou d'une force appliquée, comprenant : un générateur de tension connecté en parallèle à : un pont diviseur composé d'une première résistance et d'une seconde résistance en série, et à une première capacité connectée en série à l'actionneur piézo-électrique, un amplificateur de charges ayant une première entrée connectée à un noeud entre les deux résistances formant une masse virtuelle à haut potentiel flottant et une seconde entrée connectée à un noeud entre la première capacité et l'actionneur piézo-électrique.
Abstract:
An improved multi-axis transducer includes a stack of ferroelectric layers (20) and a plurality of common electrodes (24) and addressing electrodes (22) alternately disposed between the ferroelectric layers; each of the addressing electrodes including a number of sections electrically isolated from each other and forming a set with corresponding sections in other addressing electrodes (22), a common conductor (18) is electrically connected to the common electrodes (24) and a number of addressing conductors (12, 14, 16) is, each one, electrically connected to a different set of the sections of the addressing electrodes (22).
Abstract:
A scanning type tunnel microscope comprises a combination of an optical microscope with a tunnel scanning unit. The tunnel scanning unit is equipped with a probe held with a predetermined spacing from a sample placed on a sample mount in an axial direction and an actuator which moves the sample mount and the probe in the axial direction to bring them close to a tunnel region, and drives them relatively and three-dimensionally. An objective lens and the probe are disposed in such a manner that the center axis of the probe of the scanning tunnel unit is in agreement with the optical axis of the objective lens of the optical microscope. STM observation of the surface of the sample is made by moving the sample and the probe in the axial direction to bring them into the tunnel region and effecting scanning in the surface direction while moving them little by little in the axial direction in such a manner as to keep a tunnel current constant. Focusing is made by moving the objective lens of the optical microscope in the axial direction and a field of vision on the STM observation surface is observed as an optical microscope image through an eyepiece.