Abstract:
PROBLEM TO BE SOLVED: To provide an oscillator and an oscillatory wave driver which can achieve simple arrangement and can be manufactured by a simple manufacturing process. SOLUTION: The oscillation wave driver includes an oscillator 100 and a moving element 101. The oscillator 100 includes a piezoelectric element 1 having a tubular shape, a support 5 made of an insulating material and having a disc part 5a and a shaft rod 5b, and a fixed member 6 made of a conductive material and having a disc shape. A conductive coating 3 is formed by electroless nickel plating on the entire exposed surface of the piezoelectric element 1 and the support 5. Furthermore, the surface of the conductive coating 3 on the piezoelectric element 1 and the support 5 is irradiated with laser such that the conductive coating 3 on the outer circumferential surface of the piezoelectric element 1 is divided into four in the circumferential direction. The conductive coating 3 is melted with heat of laser and removed and an electrode division part 4 is provided. Consequently, four outer circumferential electrodes 3b are formed on the outer circumferential surface of the piezoelectric element 1. Furthermore, an inner circumferential electrode 3a is formed on the inner circumferential surface of the piezoelectric element 1. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a vibrator driving method and such capable of moving a dust-containing object to be driven efficiently to a predetermined direction by vibration.SOLUTION: The vibrator driving method comprises processes of: applying at least two driving voltages to at least one electromechanical energy conversion element provided in a vibrator; and by generating a plurality of standing waves having mutually different orders in the vibrator provided with time phase differences, generating a composite vibration composed with the plurality of standing waves. To change an amplitude distribution of the composite vibration, at least one of voltage amplitude ratio and time phase difference of at least two driving voltages is changed.
Abstract:
PROBLEM TO BE SOLVED: To provide a driving method of a piezoelectric device that can use circuit elements having lower dielectric strength by applying a minimum required bias electric field to reduce polarization inversion in a piezoelectric substance, and can obtain a predetermined displacement even when temperature changes.SOLUTION: A piezoelectric device comprises: a piezoelectric substance 1 that is formed of a material having two or more phase transition temperatures and is polarized in a thickness direction; and electrodes 2a, 2b provided on the both ends of the piezoelectric substance 1 in a direction orthogonal to the polarization direction. There is provided a driving method of the piezoelectric device for generating vibration by applying an AC electric field to the piezoelectric device by electric field applying means 3. According to this method, an absolute value of the electric field, in a direction opposite to the polarization direction in the AC electric field applied by the electric field applying means 3, is adjusted for changes in a coercive electric field associated with temperature changes to apply a bias electric field 4 in order to prevent the inversion of the polarization due to the electric field in the direction opposite to the polarization direction.
Abstract:
PROBLEM TO BE SOLVED: To reduce difference in the frequency of two resonance modes of a bolt-fastened Langevin type oscillator, increase the output power per unit volume, and economically stabilize motor capability. SOLUTION: The oscillatory wave driving apparatus comprises an elastic body having a through hole having a step part, a fastening member, an electric-mechanical energy conversion device installed in the elastic body and the fastening member and having a through hole, a shaft which has a screw part to be fitted with the fastening member by screwing and a step part for regulating the position of the thrust direction of the elastic body and is to be inserted into the through holes of the elastic body and the electric-mechanical energy conversion device, and an oscillating body which fixes the elastic body sandwiched between the step part and the fastening member and the electric-mechanical energy conversion device by fastening the fastening member in the shaft and the normal line direction of a contact face of the shaft step and the step part of the elastic body faces nearer to the axial center direction as it is in more outer circumferential side. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To accurately detect the vibration of an optical member when the optical member is vibrated by a piezoelectric device, without affected by the reflection of the vibration on the end face of the optical member.SOLUTION: A foreign object removal unit includes: a rectangular shaped optical member disposed on an optical path and having an optical effective region through which a light flux passes; a piezoelectric member; and the piezoelectric device including a drive electrode and a sensor electrode formed on the surface of the piezoelectric member. The piezoelectric device is adhered to the surface of the optical member along one side of the optical member outside the optical effective region. The sensor electrode is formed on the surface of the piezoelectric member in such a manner as to be positioned within the range of the optical effective region in the direction of the side of the optical member to which the piezoelectric device is adhered.
Abstract:
PROBLEM TO BE SOLVED: To provide an optical apparatus capable of exciting vibrations comprising a plurality of standing waves different in order and capable of moving dust in a desired direction at high removing efficiency.SOLUTION: A vibrator 3 having an object and piezoelectric elements 2a and 2b provided on the object is vibrated by applying alternating voltages to the respective piezoelectric elements 2a and 2b. The respective alternating voltages to be applied are waveforms having the frequency of making the vibrator 3 generate vibrations for which a first bending vibration and a second bending vibration different in order are superposed, and different phases. Then, the object is provided in an optical path.
Abstract:
PROBLEM TO BE SOLVED: To provide an oscillatory wave driving unit, which can elongate the durability life by reducing the friction and abrasion at a contact part between an oscillator and a contact body, and an electric apparatus. SOLUTION: The oscillatory wave motor is equipped with an oscillator 1 which has a metallic part 2 and a piezoelectric element 3 and where drive oscillation is excited, a disc-shaped contact body 4 which has an output shaft 4a in an eccentric position on a disc, and a plate spring 5 which pressurizes the oscillator 1 and the contact body 4 into contact. The oscillator 1 shifts in the direction of pressurization, according to the change of the distance between the center of the output shaft 4a of the contact body 4 and a position where the oscillator 1 and the contact body 4 are in contact, and the amount of shrinkage of the plate spring 5 changes, and the pressure of the contact face between the oscillator 1 and the contact body 4 changes. Hereby, the driving force that the contact body 4 receives from the oscillator 1 changes, and the output torque generated in the output shaft 4a of the contact body 4 changes, too. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a vibrator for enabling downsizing while keeping the number of output revolutions and output torque. SOLUTION: A plurality of projections extended radially are formed by removing a part of a plate material, and the projections are erected in a direction orthogonal to a plate bent in the outward direction of the plate material, and tips of the adjacent projections are joined with each other by welding or brazing or the like, thereby forming the vibrator. COPYRIGHT: (C)2006,JPO&NCIPI