Seiko Epson Corporation

Hidetoshi Saito

Kiichi Kajino

Eiji Miyasaka

Kazuki Imai

A piezoelectric vibrator has a first frequency region where the phase difference between a pickup signal representing the vibration of the piezoelectric vibrator and a drive signal that drives the piezoelectric vibrator does not monotonously change in accordance with the frequency of the drive signal and a second frequency region where the phase difference monotonously changes in accordance with the frequency of the drive signal. A method for controlling a piezoelectric driving apparatus including the piezoelectric vibrator controls the frequency of the drive signal in such a way that pickup voltage representing the amplitude of the pickup signal is fixed in the first frequency region and controls the frequency of the drive signal in such a way the pickup voltage is fixed with the phase difference maintained smaller than or equal to a prespecified value in the second frequency region.

Method for controlling piezoelectric driving apparatus, piezoelectric driving apparatus, and robot

A control method for a piezoelectric drive device having a vibrating portion including a piezoelectric element and a transmitting portion, synthesizing longitudinal vibration and flexural vibration by energization to the piezoelectric element to vibrate the vibrating portion and make elliptic motion of the transmitting portion, and moving a driven member by the elliptic motion of the transmitting portion, includes controlling a movement amount of the driven member by changing amplitude of the longitudinal vibration with amplitude of the flexural vibration kept constant.

Control method for piezoelectric drive device and control method for manipulator

There is provided a control method for a piezoelectric driving device including a vibrating body including a piezoelectric element for driving and configured to vibrate when a driving signal is applied to the piezoelectric element for driving, a section to be driven that is driven by the vibration of the vibrating body, and a driving-signal generating section configured to generate the driving signal using a pulse signal generated based on a target pulse duty ratio. When the target pulse duty ratio is smaller than a predetermined value, the driving signal generated by the driving-signal generating section is an intermittently generated periodic signal.

Control method for piezoelectric driving device, piezoelectric driving device, and robot

There is provided a control method for a piezoelectric driving device including a vibrating body configured to vibrate when a driving signal including a periodic signal is applied to a piezoelectric element for driving, a section to be driven that is driven by the vibration of the vibrating body, and a driving-signal generating section configured to generate the driving signal using a pulse signal generated based on a target pulse duty ratio. The driving-signal generating section detects voltage amplitude generated in the piezoelectric element for driving and generates the target pulse duty ratio based on the voltage amplitude. The driving signal includes an intermittent signal formed by an output period in which the periodic signal is output and a suspension period in which the output of the periodic signal is suspended. The driving-signal generating section detects the output-period voltage amplitude and does not detect the suspension-period voltage amplitude.

A method of controlling a piezoelectric motor as a piezoelectric drive device having a vibrator including piezoelectric elements, a rotor as a driven unit that moves at a target speed by vibration of the vibrator, and drive signal generation units that generate drive signals and output the drive signals to the piezoelectric elements, includes intermittently outputting the drive signals to the piezoelectric elements by the drive signal generation units, wherein a time when output of the drive signals is stopped is shorter than a time from when output of the drive signal is stopped to stoppage of the vibration.

Method of controlling piezoelectric drive device, method of controlling robot, and method of controlling printer

A piezoelectric drive device for vibrating a vibrating body to make a tip of a protruding part make a rotational motion of drawing an elliptic orbit to thereby drive a driven member, wherein the vibrating body includes a substrate, a driving piezoelectric element configured to vibrate the substrate, and a detecting piezoelectric element configured to detect a vibration of the substrate, the driving piezoelectric element includes a first driving piezoelectric element for making the vibrating body perform a stretching vibration in a first direction, and a second driving piezoelectric element for making the vibrating body perform a flexural vibration in a second direction perpendicular to the first direction, the detecting piezoelectric element is arranged with the first driving piezoelectric element in the first direction, and there is provided a voltage control section for controlling a magnitude of a voltage to be applied to the first driving piezoelectric element.

Piezoelectric drive device, robot and printer

A device for a robot is disclosed. In the device for a robot, a first signal is transmitted from a robot control device to the robot, a second signal is transmitted from the robot control device to the device for a robot, and a third signal is transmitted from the robot control device to the device for a robot, the third signal being transmitted from the robot control device in a case where there is a communication error between the robot control device and the device for a robot so that the device for a robot is restarted via a reset circuit.

Device for robot, robot control device, and robot system

A method for driving an electrophoretic display device that includes a display unit having a plurality of pixels and an electrophoretic element provided between a pair of substrates is provided. The method includes displaying on the display unit a third image that includes an image component of a first image and an image component of a second image before changing the first image displayed on the display unit to the second image.

Method for driving electrophoretic display device, electrophoretic display device, and electronic device

A driving device of an electrophoretic display panel having a common electrode and a plurality of divided electrodes disposed opposite to the common electrode includes: a first driving circuit that outputs a plurality of voltages corresponding to a plurality of voltage data supplied as a series of data and supplies the plurality of voltages to the plurality of divided electrodes; and a second driving circuit that outputs a voltage corresponding to supplied data and supplies the voltage to the common electrode.

Driving device and driving method of electrophoretic display

Provided is a voltage selection circuit for outputting a potential selected from a plurality of input potentials, the voltage selection circuit capable of selectively outputting a first high-level potential being a highest potential, a second high-level potential, or a third high-level potential being a lowest potential from an output terminal thereof. The voltage selection circuit includes a first switching circuit that supplies the first high-level potential to the output terminal, a second switching circuit that supplies the second high-level potential to the output terminal, and a third switching circuit that supplies the third high-level potential to the output terminal. The first switching circuit includes a high-voltage transistor and a level shifter connected to a gate terminal of the high-voltage transistor. The second switching circuit includes a first low-voltage transistor, a level shifter connected to a gate terminal of the first low-voltage transistor, and a diode disposed between the first low-voltage transistor and the output terminal. The third switching circuit includes a second low-voltage transistor and a diode disposed between the second low-voltage transistor and the output terminal.

Voltage selection circuit, electrophoretic display apparatus, and electronic device

In an electrophoretic device including a display including pixels with electrophoretic particles between pixel and common electrodes, a pixel-switching element, a memory holding an image signal from the pixel-switching element, and a switch connecting one of first and second control lines to the pixel electrode according to a signal output according to the image signal from the memory, a driving circuit includes a holding voltage unit supplying a holding voltage holding the image signal in the memory, a pixel potential unit supplying a first pixel potential to the first control line and a different second pixel potential to the second control line, a common potential unit supplying a common potential to the common electrode, and a control unit controlling the holding potential unit, the common potential unit, and the pixel potential unit to stop the holding potential after the first and second pixel potentials and common potential are stopped.

Growing community of inventors

Fujimi, Japan

Hidetoshi Saito