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| Number | Title | Issue Date |
| 6469418 | Vibration monitoring system and method A differential circuit is used to compare the current to the drive transducers to a matched reference circuit. With the capacitive current from the piezoelectric transducer canceled out in this manner, the resulting output current provides a direct measur... | 10/22/2002 |
| 6465932 | Method and apparatus for controlling piezoelectric vibratory parts feeder An apparatus for controlling a piezoelectric vibratory parts feeder comprises a piezoelectric vibrating unit provided with a piezoelectric vibrating element that vibrates at a predetermined frequency, a bowl adapted to discharge parts accommodated therein... | 10/15/2002 |
| 6465931 | Device and method for driving symmetric load systems The invention described herein is a novel power circuit capable of electrically driving devices whose mechanical action is accomplished by induced strain transducers. The power circuit neither recycles nor dissipates the energy returned from the near loss... | 10/15/2002 |
| 6465933 | Method for electronic damping of piezoelectric positioners Electronic damping may be provided to a piezoelectric positioner by developing a voltage signal proportional to the current through the dynamic impedance portion of the positioner impedance and then reducing the voltage applied to the positioner in propor... | 10/15/2002 |
| 6459190 | Switched actuator control The present invention discloses an electromechanical actuator arrangement and a driving device for such an arrangement, having a plurality of drive element to be driven according to a wailing mechanism is provided. The driving device is characterised by a... | 10/01/2002 |
| 6452350 | Linear drive A linear drive to drive an article of furniture includes at least one drive motor that is coupled with a linearly moveable driven member and a braking system with a controlled braking element which commences the braking function without delay. The braking... | 09/17/2002 |
| 6441535 | Method and apparatus for driving at least one capacitive control element A control element, in particular a piezoelectrically operated fuel injection valve in an internal combustion engine, is charged, in order to compensate for stochastic reactions in the internal combustion engine, with a constant nominal voltage applied to ... | 08/27/2002 |
| 6441534 | Ultrasonic motor and electronic apparatus equipped with ultrasonic motor An ultrasonic motor has a self-excited oscillation circuit comprised of a vibrating body having a piezoelectric element and an amplifier circuit for amplifying an output signal of the piezoelectric element for oscillating the vibrating body in a predeterm... | 08/27/2002 |
| 6437480 | Apparatus and method for driving an ultrasonic motor to reduce rise response time An apparatus and method for driving an ultrasonic motor to reduce the rise response time. The ultrasonic motor is drivable at different frequencies and has a desired target speed, each frequency corresponding to a respective speed and a respective torque.... | 08/20/2002 |
| 6437481 | Control device for vibration type motor and apparatus using thereof This invention relates to a driving device for a vibration type motor. According to this invention, maximum speed data of the motor is obtained in accordance with the temperature, and the speed is controlled using the data as an upper limit, thereby prope... | 08/20/2002 |
| 6433461 | Driving apparatus and method using electromechanical conversion elements In a truss-type actuator, drive signals that have been subjected to frequency modulation are impressed to the electromechanical conversion elements in order to improve the driving of the actuator. By doing so, stable driving that is not affected by fluctu... | 08/13/2002 |
| 6433459 | Piezoelectric actuator In an impact type piezoelectric actuator, a driven member is movably coupled with a driving member by a friction force and the driving member is reciprocally moved by expansion and contraction of a piezoelectric device. The piezoelectric actuator is expan... | 08/13/2002 |
| 6433460 | Apparatus and methods for cleaning and/or processing delicate parts The invention utilizes harmonics of certain clamped ultrasound transducers to generate ultrasound within the liquid of an ultrasonic tank and in a frequency range of between about 100 khz to 350 khz (i.e., "microsonic" frequencies). The application of mic... | 08/13/2002 |
| 6433458 | Method and unit for driving piezoelectric transformer used for controlling luminance of cold-cathode tube A method and unit for driving a small high-efficiency piezoelectric transformer allowing a cold-cathode tube to have stable luminance by detecting only an active current flowing in the cold-cathode tube based on a phase difference between an output curren... | 08/13/2002 |
| 6424076 | Incremental switched deformable mirror A method of driving a plurality of actuators comprising the steps of providing a plurality of actuators and a controller having drive output signals for driving said plurality of actuators. At least one multiplexer is provided between said controller and ... | 07/23/2002 |
| 6417598 | Power circuit for piezo-electric motor Power circuit for traveling or standing wave piezo-electric motors comprising a series resonant circuit, a switching element (T1) in parallel with the capacitor C of the resonant circuit and a switching element control (O) ensuring the cyclic closure ther... | 07/09/2002 |
| 6411009 | Piezoelectric actuator system A piezoelectric actuator has at least two piezoelectric actuator elements connected in series with each other mechanically and electrically and form a half bridge in an amplifier bridge circuit having a further half bridge formed by two series connected e... | 06/25/2002 |
| 6411008 | Drive device for vibration type motor and image forming apparatus This invention relates to a driving control device for a vibration wave motor. A periodic change in frequency of a driving periodic signal is detected during driving of the motor, a frequency corresponding to the detected change is set as a lower limit va... | 06/25/2002 |
| 6384511 | Device having vibration wave motor as driving source A vibration wave motor having improved driving characteristics includes a mode for driving the vibration wave motor at a second speed set higher than a first speed which is a normal speed of the motor required in normal processing performed by driving the... | 05/07/2002 |
| 6376966 | Method and apparatus for controlling a piezoelectric device A system for controlling the operation of a piezoelectric device including a control system operable to generate a first control signal representing a desired charge on the piezoelectric device and corresponding to a desired position of a piezoelectric de... | 04/23/2002 |
| 6376965 | Driving device for vibration type actuator This invention relates to a driving device for a vibration type actuator. In this device, since the characteristics of the actuator change depending on temperature and the like, control characteristics must be optimized. This invention is designed to dete... | 04/23/2002 |
| 6359372 | Circuit card assembly having controlled expansion properties Piezoelectric material is embedded in epoxy layers of circuit cards to control thermal expansion and contraction as a function of temperature changes. A temperature sensor and thermostat generates a controlled voltage as a function of temperature and appl... | 03/19/2002 |
| 6359369 | Ultrasonic motor and electronic appliance having same An ultrasonic motor is provided that is improved in reliability of a self-oscillator circuit constituted by the ultrasonic motor itself and high in efficiency. In a case of driving with one standing wave, the resonant point of a vibration mode used for dr... | 03/19/2002 |
| 6345834 | Recreational snowboard A recreational board such as a snowboard incorporates strain transducers to damp a plate resonance of the board. The strain transducers are preferably located around a peripheral region to capture strain energy affecting control edges, for example steerin... | 02/12/2002 |
| 6335585 | Controller for vibration wave motor and image forming apparatus A controller for controlling a vibration wave motor is provided such that, when the motor is halted in an irregular manner, a drive signal having a frequency insufficient to start rotation of the motor is fed to the motor so as to permit the motor to be m... | 01/01/2002 |
| 6320298 | Actuator driving circuit, an actuator driving device, and an actuator driving method An actuator driving circuit includes a drive pulse signal generator, a drive voltage generator for generating a drive voltage for drive pulse signal generation upon receipt of a power supplied from a power source. The drive pulse signal is generated so th... | 11/20/2001 |
| 6320297 | Method for low loss control of a capacitive load, in particular of a piezoelectric actuator The invention related to a method for low loss periodic control of a capacitive load (CP), in particular of a piezoelectric actuator. In this method, before load control begins, a capacitor bank (C1) is charged via a voltage source (... | 11/20/2001 |
| 6320300 | Piezoelectric array devices Piezoelectric crystals are arranged to function as variable resonators. In one embodiment, three crystals are arranged as an array, with a center crystal between two outer crystals. An electrical excitation of the outer crystals causes a mechanical displa... | 11/20/2001 |
| 6313565 | Multiple frequency cleaning system The invention utilizes multiple frequency sound in liquids to improve the cleaning or processing effect. The sound frequencies are produced in two or more non-overlapping continuous frequency ranges. The sound frequencies are controlled to change frequenc... | 11/06/2001 |
| 6310428 | Piezoelectric switch with audible feedback A piezoelectric switch comprising an end surface which when pressure is applied, causes a piezoelectric element to switch and generate an electrical signal. In addition, the piezoelectric element provides audible feedback to an operator activating the swi... | 10/30/2001 |
| 6288473 | Frequency modulation drive for a piezoelectric motor A piezoelectric motor has peak performance at a specific frequency f1 that may vary over a range of frequencies. A drive system is disclosed for operating such a motor at peak performance without feedback. The drive system consists of the motor... | 09/11/2001 |
| 6285115 | Method and apparatus for controlling position and velocity of a piezoelectric device A control system for controlling position and velocity of a piezoelectric device. The control system includes a position control circuit that is operable to receive a control signal corresponding to a desired position of the piezoelectric device, and to c... | 09/04/2001 |
| 6265809 | Drive circuit for ultrasonic motor A drive circuit for an ultrasonic motor includes a DC power source, a transformer for applying to the ultrasonic motor two phase high frequency voltage alternating currents having a predetermined phase difference for driving the ultrasonic motor, a switch... | 07/24/2001 |
| 6259188 | Piezoelectric vibrational and acoustic alert for a personal communication device An alert apparatus for a personal communication device includes a mechanically prestressed piezoelectric wafer positioned within the personal communication device and an alternating voltage input line coupled at two points of the wafer where polarity is r... | 07/10/2001 |
| 6255760 | Driving apparatus of piezoelectric vibrator Two current outputs are converted into voltage outputs by I/V converters, and further converted into digital outputs D1 and D2 by binarizing circuits. The outputs are added by an adder in a phase shifter, and converted into an output like a triangular wav... | 07/03/2001 |
| 6252332 | Ultrasonic motor An ultrasonic motor includes a vibrator vibrating in conformity with a frequency voltage. A relative motion member effects relative vibration in conformity with the vibration of the vibrator. The vibrator is adapted to vibrate in a first vibration mode an... | 06/26/2001 |
| 6252334 | Digital control of smart structures Modular control patches including assemblies of sensors and actuators are provided to impart or control vibration of foundation members such as struts in aerospace apparatus. Local digital electronic control means is associated with each control patch ass... | 06/26/2001 |
| 6246152 | Driver circuit for controlling a piezoelectric actuator in charge mode A driver circuit for controlling a piezoelectric actuator in a charge mode includes an amplifier having a first input terminal for receiving a control voltage, a second input terminal, and a main final stage with a main output terminal connected to the pi... | 06/12/2001 |
| 6242845 | Electronic driving circuit for a bistable actuator An electronic driving circuit for a bistable actuator activated by piezoelectric elements, particularly for residual-current devices, the circuit including a voltage step-up device suitable to step up and store a voltage generated across a secondary windi... | 06/05/2001 |
| 6236190 | Method and device for driving a capacitive actuator A constant displacement ds of a capacitive actuator, for instance a capacitor for a fuel injection valve of an internal combustion engine, is obtained within a wide temperature range. While the actuator is being charged, its current and the voltage across... | 05/22/2001 |
