Patent application number | Description | Published |
20110121686 | DRIVING CIRCUIT FOR VIBRATION-TYPE ACTUATOR - A driving circuit is configured to drive a vibration-type actuator including a vibration member and a moving member. The vibration member includes an electro-mechanical energy conversion element and may generate a vibration wave in response to an alternating voltage applied to the electro-mechanical energy conversion element. The moving member is in contact with the vibration member and may move in response to the vibration wave relative to the vibration member. The driving circuit includes a capacitor and an inductor connected in series with the capacitor to the electro-mechanical energy conversion element. Parameters of the driving circuit may be set such that when a series resonance frequency of the inductor and the capacitor is denoted by fs and a resonance frequency of the vibration member is denoted by fm, a condition 0.73·fm05-26-2011 | |
20110227511 | DRIVING UNIT OF VIBRATION-TYPE ACTUATOR - A driving unit of a vibration-type actuator includes a command unit, a change making unit, an AC signal generating unit, and a filter unit. The command unit outputs a command signal that directs at least one of a frequency, an amplitude, and a phase difference of an AC signal. The change making unit makes a change to the command signal and outputs the command signal. The AC signal generating unit generates a generated AC signal in which at least one of a frequency, an amplitude, and a phase difference of the generated AC signal is modulated in accordance with the output of the change making unit. The filter unit selectively dampens a frequency component, of at least one of the output signal of the change making unit and an output signal of the AC signal generating unit, that excites vibration other than vibration in a predetermined vibration mode. | 09-22-2011 |
20110248652 | CONTROL CIRCUIT FOR VIBRATION-TYPE ACTUATOR - A control circuit is provided for a vibration-type actuator that generates a vibration wave in a vibrating member by applying an alternating voltage, and relatively rotates a moving member contacting protrusions of the vibrating member. The control circuit includes a feedback control circuit and a repetitive compensator. The feedback control circuit subjects the vibration-type actuator to feedback control based on a deviation between a relative speed between the moving member and the vibrating member and a command speed or a deviation between a relative position between the moving member and the vibrating member and a command position. The repetitive compensator provides a repetitive period that is set to T/(an integral multiple of fs), where T is a period of rotation of the moving member, and fs is a spatial frequency of a speed deviation based on a contact area distribution between the protrusions and the moving member. | 10-13-2011 |
20130063054 | DRIVING APPARATUS FOR VIBRATION-TYPE ACTUATOR - A driving apparatus for a vibration-type actuator that applies an AC voltage to an electro-mechanical energy conversion element and generates a driving force between a vibration member and a movable member includes a voltage amplitude command unit configured to instruct an amplitude of the AC voltage, a pulse width command unit configured to monotonically increase a pulse width command and a change rate of the pulse width command according to an increase in a voltage amplitude command, and output a pulse width command, and a pulse signal generation unit configured, when a pulse signal that directly or indirectly generates the AC voltage is generated at the same frequency as the AC voltage to apply the AC voltage to the electro-mechanical energy conversion element, to generate a pulse signal having a pulse width corresponding to the pulse width command based on the pulse width command. | 03-14-2013 |
20130241446 | UNNECESSARY VIBRATION DETECTION APPARATUS AND DRIVING CONTROL APPARATUS OF VIBRATION TYPE ACTUATOR - An unnecessary vibration detection apparatus of a vibration type actuator includes an AC voltage generation unit that generates a plurality of AC voltages having a driving frequency; a vibration detection unit that outputs a vibration detection signal of the vibration type actuator; and an unnecessary vibration detection unit that detects an unnecessary vibration component by generating a signal for cancelling the vibration component of the driving frequency in the vibration detection signal by controlling amplitudes of a plurality of AC signals which are used for generating the plurality of AC voltages. | 09-19-2013 |
20130257223 | CONTROLLING DEVICE FOR VIBRATION TYPE ACTUATOR - A controlling device for a vibration type actuator including: an AC voltage generating unit in which at least one of parameters, namely a frequency, an amplitude, and a phase of an AC voltage for use in applying an excitation force to a vibrating member is settable; a measuring unit which measures some physical quantities caused by a vibration of the vibrating member; a variation imparting unit which imparts a predetermined variation to at least one of the parameters of the AC voltage; a frequency-response characteristic measuring unit which finds a frequency-response characteristic of at least one predetermined frequency between a first signal according to the variation and a second signal according to the measured physical quantity; and a frequency controlling unit which controls the frequency of the AC voltage according to the frequency-response characteristic. | 10-03-2013 |
20130257333 | CONTROL APPARATUS FOR VIBRATION TYPE ACTUATOR - A control apparatus for a vibration type actuator using a vibration wave excited by a vibrating member, a movable member in contact with or indirectly connected to the vibrating member, including a command unit which gives a command indicating at least one parameter, an AC voltage generator which generates the AC voltage for applying the excitation force to the vibrating member, a variable adding unit which adds a predetermined variable to each of one or more parameters, a frequency response characteristic measuring unit which receives as an input a variable output and outputs a physical quantity and obtains a frequency response characteristic at one or more predetermined frequencies, a resonance frequency estimation unit which estimates a resonance frequency of the vibrating member, and a frequency range limiter which determines a frequency range for the AC voltage output by the AC voltage generator. | 10-03-2013 |
20130333477 | MEASURING SYSTEM - A measuring system for measuring a physical quantity related to one of an electromagnetic wave and a magnetic field includes a vibration-type actuator, a waveform generating unit configured to generate a driving waveform signal of the vibration-type actuator, an optical transmitter unit configured to receive the driving waveform signal and convert the driving waveform signal into an optical signal, an optical receiver unit configured to receive the optical signal and convert the optical signal into an alternating-current voltage signal, and a drive circuit configured to receive the alternating-current voltage signal and apply the alternating-current voltage signal to the vibration-type actuator. The waveform generating unit and the optical transmitter unit are disposed outside a magnetic shield room. The optical receiver unit, the drive circuit, and the vibration-type actuator are disposed inside the magnetic shield room, and the optical signal is transmitted between the optical transmitter unit and the optical receiver unit. | 12-19-2013 |
20130334988 | DRIVING DEVICE AND DRIVING CIRCUIT FOR A VIBRATION ACTUATOR - A driving device, including a drive signal generating section configured to variably control a frequency or an amplitude of an application voltage to a vibration member, including: a variable period setting section configured to output a value of a PWM period, the set value being set so that an average value of PWM periods in one target period of the application voltage is one fraction of an integer number of the target period by variably adjusting the PWM periods in an aperiodic manner; a drive waveform information output section; and a variable period PWM signal generating section configured to generate a PWM signal based on the set value of the PWM period output from the variable period setting section and drive waveform information of the application voltage, wherein the drive signal generating section is a digital circuit. | 12-19-2013 |
20130334989 | DRIVING DEVICE FOR VIBRATION-TYPE ACTUATOR AND MEDICAL SYSTEM USING SAME - A driving device for a vibration-type actuator of the present invention is a driving device for driving a vibration-type actuator disposed in a magnetically shielded room. The driving device includes a linear amplifier is configured to receive a signal based on a driving waveform for driving the vibration-type actuator and output a driving voltage to be applied to the vibration-type actuator. | 12-19-2013 |
20140009088 | DRIVING CIRCUIT FOR VIBRATION-TYPE ACTUATOR - An apparatus includes a vibration-type actuator and a driving circuit. The vibration-type actuator includes a vibration member and a moving member, wherein the vibration member includes an electro-mechanical energy conversion element and the moving member is configured to move relative to the vibration member. The driving circuit includes a capacitor and an inductor connected in series with the capacitor to the electro-mechanical energy conversion element. In an example, parameters of the driving circuit are set such that, when a series resonance frequency of the inductor and the capacitor is denoted by fs and a resonance frequency of the vibration member is denoted by fm, a condition 0.73·fm01-09-2014 | |
20140292233 | DRIVING CIRCUIT FOR VIBRATION-TYPE ACTUATOR - A driving circuit to drive a vibration member comprising an electro-mechanical energy conversion element includes a transformer connected in parallel to the electro-mechanical energy conversion element. The transformer includes a primary coil configured such that an alternating voltage is applied to the primary coil, and a secondary coil connected to the electro-mechanical energy conversion element in parallel, and an inductor connected to the primary coil in series, Parameters of the driving circuit are set such that, when a frequency of a peak voltage applied to the electro-mechanical energy conversion element is denoted by fe and a driving frequency of the vibration member is denoted by fd, a condition fe<1.5·fd is satisfied. | 10-02-2014 |