Patent application number | Description | Published |
20110050035 | ULTRASONIC MOTOR - The invention relates to an ultrasonic motor having a multilayer actuator in the form of a multilayer plate, having one or more friction elements or friction layers on its side surfaces and having an electrical exciter apparatus for the actuator. According to the invention, the multilayer plate has two intersecting, mirror-imaged asymmetrical generators for ultrasonic vibrations, to be precise in the form of layers of exciter electrodes and general electrodes which are alternately arranged with layers of piezoelectric ceramic, wherein a two-dimensional asymmetrical acoustic standing wave is generated in the multilayer actuator. | 03-03-2011 |
20110175489 | ULTRASONIC ACTUATOR - The invention relates to an ultrasonic actuator, preferably for use in an ultrasonic motor, in the form of a piezoelectric plate with a length L, height H and thickness t, wherein the piezoelectric plate has a lateral plane of symmetry Sq, a longitudinal plane of symmetry Sl and at least two main surfaces, and the piezoelectric plate comprises at least two generators symmetrically disposed with respect to plane of symmetry Sq for generating ultrasonic standing waves. According to the invention, the piezoelectric plate has a shape that includes at least eight lateral surfaces, wherein at least two of the lateral surfaces are working surfaces for contacting of elements to be driven, and at least two of the lateral surfaces are holding surfaces for holding the piezoelectric plate, and the remaining lateral surfaces are free surfaces, wherein at least four free surfaces are arranged at an identical angle α with respect to the longitudinal plane of symmetry Sl and/or at an identical angle φ with respect to the lateral plane of symmetry Sq. | 07-21-2011 |
20120228994 | ACTUATOR - An exemplary actuator in the form of a plate is disclosed, which includes, at least two generators for exciting an acoustic standing wave in the actuator. The actuator can have at least two main surfaces and a plane of symmetry S running perpendicularly to the main surfaces, with respect to which the generators are arranged symmetrically. A first lateral surface area can have a length L that substantially corresponds to the wavelength of the acoustic standing wave excited in the actuator. A second lateral surface area of the actuator can have a length (B) that is greater than the wavelength of the acoustic standing wave excited in the actuator, and that is not equal to a multiple of half the wavelength of the excited acoustic standing wave. | 09-13-2012 |
Patent application number | Description | Published |
20080211348 | Linear Ultrasound Motor - The invention relates to an ultrasound linear piezoelectric motor comprising an ultrasound oscillator ( | 09-04-2008 |
20080297001 | Miniaturizable Motor - The invention relates to a miniaturizable motor ( | 12-04-2008 |
20090009032 | Linear Ultrasound Motor - The invention relates to a linear ultrasound piezoelectric motor comprising a mobile element that is in frictional contact with a plate-like rectangular resonance plate, wherein the frictional surface is embodied by means of at least one of the longitudinal narrow sides of the resonance plate, and electrodes for producing acoustic vibrations which are arranged on the longitudinal wide sides of the resonance plate. According to the invention, the generator for producing acoustic vibrations is asymmetrically arranged in relation to a plane which symmetrically cross-cuts the resonance plate, and comprises two opposing electrodes generating a stationary asymmetrical space wave when excited. | 01-08-2009 |
20100013353 | PIEZOELECTRIC ACTUATOR FOR AN ULTRASONIC MOTOR - The invention relates to a piezoelectric actuator, especially for an ultrasonic motor, comprising an acoustic oscillation resonator, wherein the acoustic oscillation resonator is substantially formed as a rectangular piezoelectric plate with two main surfaces, two side surfaces and two end faces and has a multilayer structure in its interior which represents a layer of excitation electrodes taking turns with the layers of the common electrodes and the layers of polarized ceramic provided therebetween, with the polarization vector extending perpendicularly with respect to the surface of the electrodes, wherein all excitation electrodes are divided into two groups not connected to each other, which are disposed symmetrically with respect to the symmetry surface of the aforementioned plate, wherein this symmetry surface extends perpendicularly with respect to the main and side surfaces of the plate, namely through the center thereof, with each group of the excitation electrodes forming together with the common electrodes and the piezoceramic therebetween a multilayer generator for an acoustic wave which is arranged asymmetrically with respect to the symmetry surface of the piezoelectric plate. | 01-21-2010 |
20100072857 | Ultrasonic Linear Motor - The invention relates to an ultrasonic linear motor ( | 03-25-2010 |
20110018392 | ULTRASONIC LINEAR DRIVE UNIT COMPRISING A HOLLOW CYLINDRICAL OSCILLATOR - The invention relates to an ultrasonic linear drive unit comprising a driving element as an ultrasonic oscillator with two generators for ultrasonic vibrations and a driven element that forms a frictional contact with the driving element, and an electrical excitation source for the driving element. According to the invention, the ultrasonic oscillator is designed as a hollow thin-walled piezoelectric cylinder, the height H of which is identical to or smaller than the mean diameter D thereof. The generators for ultrasonic vibrations are symmetrically disposed on both sides relative to the sectional plane S that extends through the center of the height of the ultrasonic oscillator, perpendicular to the longitudinal axis L thereof. The cylinder surface of the driving element is in contact with the driven element, and the electrical excitation source is connected to the ultrasonic linear drive unit in such a way that the drive unit excites only the first or the second generator for ultrasonic vibrations. | 01-27-2011 |
20140001922 | ULTRASONIC MOTOR | 01-02-2014 |
Patent application number | Description | Published |
20080211348 | Linear Ultrasound Motor - The invention relates to an ultrasound linear piezoelectric motor comprising an ultrasound oscillator ( | 09-04-2008 |
20080297001 | Miniaturizable Motor - The invention relates to a miniaturizable motor ( | 12-04-2008 |
20090009032 | Linear Ultrasound Motor - The invention relates to a linear ultrasound piezoelectric motor comprising a mobile element that is in frictional contact with a plate-like rectangular resonance plate, wherein the frictional surface is embodied by means of at least one of the longitudinal narrow sides of the resonance plate, and electrodes for producing acoustic vibrations which are arranged on the longitudinal wide sides of the resonance plate. According to the invention, the generator for producing acoustic vibrations is asymmetrically arranged in relation to a plane which symmetrically cross-cuts the resonance plate, and comprises two opposing electrodes generating a stationary asymmetrical space wave when excited. | 01-08-2009 |
20100013353 | PIEZOELECTRIC ACTUATOR FOR AN ULTRASONIC MOTOR - The invention relates to a piezoelectric actuator, especially for an ultrasonic motor, comprising an acoustic oscillation resonator, wherein the acoustic oscillation resonator is substantially formed as a rectangular piezoelectric plate with two main surfaces, two side surfaces and two end faces and has a multilayer structure in its interior which represents a layer of excitation electrodes taking turns with the layers of the common electrodes and the layers of polarized ceramic provided therebetween, with the polarization vector extending perpendicularly with respect to the surface of the electrodes, wherein all excitation electrodes are divided into two groups not connected to each other, which are disposed symmetrically with respect to the symmetry surface of the aforementioned plate, wherein this symmetry surface extends perpendicularly with respect to the main and side surfaces of the plate, namely through the center thereof, with each group of the excitation electrodes forming together with the common electrodes and the piezoceramic therebetween a multilayer generator for an acoustic wave which is arranged asymmetrically with respect to the symmetry surface of the piezoelectric plate. | 01-21-2010 |
20100072857 | Ultrasonic Linear Motor - The invention relates to an ultrasonic linear motor ( | 03-25-2010 |
20100085649 | Optical objective module - The invention relates to an objective module comprising an optical zoom lens group ( | 04-08-2010 |
20110018392 | ULTRASONIC LINEAR DRIVE UNIT COMPRISING A HOLLOW CYLINDRICAL OSCILLATOR - The invention relates to an ultrasonic linear drive unit comprising a driving element as an ultrasonic oscillator with two generators for ultrasonic vibrations and a driven element that forms a frictional contact with the driving element, and an electrical excitation source for the driving element. According to the invention, the ultrasonic oscillator is designed as a hollow thin-walled piezoelectric cylinder, the height H of which is identical to or smaller than the mean diameter D thereof. The generators for ultrasonic vibrations are symmetrically disposed on both sides relative to the sectional plane S that extends through the center of the height of the ultrasonic oscillator, perpendicular to the longitudinal axis L thereof. The cylinder surface of the driving element is in contact with the driven element, and the electrical excitation source is connected to the ultrasonic linear drive unit in such a way that the drive unit excites only the first or the second generator for ultrasonic vibrations. | 01-27-2011 |