Abstract: First and second metal portions are tightened integrally on both surfaces of one or plural sheets of electrostrictive element bodies polarized in the thickness direction and divided in two uniform halves using a tightening tool, thereby a flexible vibrator is provided, and a cutting tool is installed to an output end portion of the flexible vibrator and a work is cut by ultrasonic vibration generated in the flexible vibrator. Workability of the cutting working is improved and the structure is simplified, and the device as a whole is made compact.

Abstract: The present invention includes a radial force detection mechanism for detecting a radial force generated by cutting operation of a cutting tool by use of an ultrasonic vibrator, a depth-of-cut feed mechanism for moving the cutting tool in the depth-of-cut direction, and a vertical feed mechanism for controlling the vertical position of the cutting tool, combined with correction of its movement in the depth-of-cut direction by the depth-of-cut feed mechanism, so as to bring it to the position where a radial force detection signal detected by the radial force detection mechanism becomes zero. By moving the cutting tool in the vertical direction by use of the vertical feed mechanism so that the radial force detection signal may become zero, no radial force is applied to the cutting tool.

Abstract: The present invention provides an ultrasonic oscillation machining apparatus wherein accurate oscillation machining can be attained using a small vertical ultrasonic oscillating element which oscillates with a high frequency. The ultrasonic oscillation machining apparatus comprises a wide oscillating body divided into a plurality of units by one or more slits formed in said wide oscillating body with opposite end portions left thereon, a plurality of vertical ultrasonic oscillating elements secured to one end faces of said individual units of said wide oscillating body for producing vertical oscillations of such a frequency that said opposite end portions of said wide oscillating body are positioned at loop portions of oscillations of the wide oscillating body, and a bite provided at one of said end portions of said wide oscillating body which is positioned at one of the loop portions of oscillations of said wide oscillating body.

Abstract: An ultrasonic vibrator comprises torsional electrostrictive transducers for torsional vibration, longitudinal electrostrictive transducers for longitudinal vibration, and two metallic members firmly, coaxially and integrally holding the torsional electrostrictive transducers and the longitudinal electrostrictive transducers therebetween. An altered section is formed in one of the metallic members in such a shape that makes the torsional resonant frequency and the longitudinal resonant frequency coincide with each other. A voltage or an electric current having a controlled amplitude and/or a controlled relative phase is applied to the electrostrictive transducers to generate composite vibrations of various modes.

Abstract: A plurality of block-shaped electrostrictive elements are arranged while polarization directions are coincident to the same circumferential direction, thereby an electrostrictive element to be grasped by metal members is constituted. These block-shaped electrostrictive elements have residual polarization in perpendicular direction to the thickness direction. A rectangular electrostrictive material is cut, thereby a number of block-shaped electrostrictive elements are obtained in one polarization treatment.

Abstract: An ultrasonic motor having a torsional vibrator a diametrically or longitudinal disk resonator. A diametrically or longitudinal resonator is located at the node of the vibratory member and at right angles thereto. A rotor is disposed opposite to the output of the vibratory member.

Abstract: The present invention comprises one or a plurality of electrostrictive elements, each of which is structured of an electrostrictive element body polarized in the direction of its thickness with two divisions of electrodes disposed on one face thereof and a common electrode disposed on the other face thereof, and metallic members placed on both sides of the electrostrictive element, or elements, and integrally fastened together by means of a fastening member. And these electrodes are supplied with A.C.

Abstract: In an ultrasonic vibrator provided such that its electrostrictive element is constituted of an electrostrictive element body polarized in the direction of its thickness, pairs of electrodes each thereof being peripherally divided into two segments formed on one face thereof, and a common electrode formed on the other face thereof, and metallic members shaped in such a form that will make the flexural resonant frequency and the axial resonant frequency equal are integrally fastened by means of a fastener onto both faces of one sheet or a plurality of sheets of the electrostrictive elements, the present invention is characterized in that a flexural driving output of inverted phase is applied to the respective electrodes forming the pairs in the electrostrictive member and a common axial driving output is applied to the respective electrodes in a superimposed manner, so that the vibrations in the axial direction and the flexural direction are individually controlled as if there are individually present an axiall

Abstract: In an ultrasonic vibrator, a plurality of electrode pairs, each including electrodes halved on one surface, are arranged in the circumferential direction so as to constitute an electrostrictive element. The electrostrictive element is held and tightened by a vibrator and a metal member. The vibrator is provided with foot portions divided in a number of divisions coincident with the number of the electrode. The halved electrodes of the electrode pairs are connected while parallel in matching with the circumferential position, and AC voltages controlled in relative phase or relative amplitude are applied to respective electrodes. Various vibrations are generated in the vibrator, and the elliptic rate can be controlled during control of the vibration direction or generation of elliptic vibration.

Abstract: A rotary ultrasonic motor equipped with an ultrasonic vibrator including an electrostrictive element which is polarized in the direction of its thickness and has a plurality of electrode pairs arrayed uniformly in the circumferential direction. The electrostrictive element is held and clamped between two metallic members, and grooves are formed in at least one metallic member along division lines corresponding in number to the electrode pairs of the electrostrictive element, thereby constituting the ultrasonic vibrator. And a rotor having an output shaft at the center of rotation thereof is kept in pressed contact with the output end of the ultrasonic vibrator. In this motor, the rotor is driven by composite vibration, and an improved function is achievable to prevent mutual interference that may otherwise be caused by a circumferential stress at the axial vibration of the ultrasonic vibrator.

Abstract: A method is disclosed for perforating materials with a metal needle whereby the method involves the utilization of an ultrasonic vibration signal being applied to the metal needle in order to vibrate the needle in an axial direction to thereby penetrate a plurality of layered materials due to the axial vibration of the metal needle.

Abstract: In the present invention, a plurality of electrodes are formed on the two surfaces of a circular member of electrostrictive material, and every adjacent electrodes are simultaneously so polarized as to be mutually reverse in the circumferential direction.

Abstract: In an ultrasonic transducer, frequency characteristics of phase detecting signal and frequency characteristics of transducer drive current are searched, resonant point with current dipping is found on the characteristics, the zero cross point corresponding to the current dipping is decided as the fundamental resonant point, and then PLL follow oscillation is performed. In such constitution, even if there exist many sub resonant frequency points near the fundamental resonant frequency, the PLL follow oscillation can be performed stably.

Abstract: In an ultrasonic transducer, frequency characteristics of phase detecting signal and frequency characteristics of transducer drive current are searched, the resonant point with current dipping is found on the characteristics, the zero cross point corresponding to the current dipping is decided as the fundamental resonant point, and then a PLL following oscillation operation is performed. Under such condition even if there exist many sub resonant frequency points near the fundamental resonant frequency, the PLL follow oscillation can be performed stably.

Abstract: A method and a circuit for stably driving an ultrasonic transducer by sweeping, as a first step of starting the oscillation, the oscillating frequency over a range wider than a PLL followable range, finding a resonant point to lock the oscillating frequency thereto, and effecting, as a second step, the PLL following operation starting from the above resonant point.

Abstract: A supersonic transducer including means for detecting its vibrating speed and for changing the frequency of the energizing current in response thereto. This invention utilizes the property that when an electrostrictive vibrator is vibrated resonantly, its dynamic admittance varies depending upon the difference in its stress distribution. The electrostrictive vibrator is divided into portions of large and small stresses to cancel the applied brake currents. Simultaneously, a signal is derived that is proportional to the difference of the dynamic currents so as to provide an effective energization by detecting the resonant frequency of the vibrator in order to automatically adjust the applied frequency of the supersonic transducer.