Seiko Epson Corporation

Tomoaki Takahashi

Minoru Usui

Tsuyoshi Kitahara

Ryoichi Tanaka

Satoru Hosono

Hirofumi Teramae

Fujio Akahane

Noriaki Okazawa

Minoru Watanabe

Atsushi Furuhata

Takahiro Katakura

Yoshinao Miyata

Noboru Tamura

Yutaka Arakawa

Kiichi Kajino

Akio Konishi

Takayuki Togashi

Kazuhiko Hara

Kenji Tsukada

Tomohiro Sayama

Kenji Otokita

Yasuhiro Sudo

Tsunenobu Endo

Kazutoshi Goto

Goki Hiramoto

Satoshi Shinada

Hitotoshi Kimura

Hiroshige Owaki

Hidenori Usuda

Masato Shimada

Hideo Haneda

Hirofumi Sakai

Junhua Zhang

Kaoru Momose

Takayuki Iijima

Tsutomu Miyamoto

Satoshi Nakajima

Noboru Furuya

Takashi Nakamura

Yuichiro Tsuyuki

Toshiaki Kori

Keisuke Niishida

Nobuaki Okazawa

A piezoelectric drive device includes a piezoelectric element, a vibrating plate with a concave portion provided in a side surface, and a projecting portion provided between two side surfaces of the concave portion and having a spherical shape, an elliptical shape, or an egg shape, wherein a plurality of the piezoelectric elements and a plurality of the vibrating plates are stacked, and the concave portion includes a bottom surface.

Piezoelectric drive device, piezoelectric motor, and robot with the piezoelectric drive device

A piezoelectric drive device includes a substrate, a convex portion coupling to the substrate and transmitting drive power to a driven member, first drive piezoelectric elements placed on the substrate and vibrating the substrate in Y directions in which the substrate and the convex portion are arranged, second drive piezoelectric elements placed on the substrate and vibrating the substrate in Z directions orthogonal to the Y directions, a reference piezoelectric element placed on the substrate, receiving the vibration in the Y directions, and outputting a detection signal, and a concave portion placed side by side with the reference piezoelectric element in the Z directions in a plan view from an X direction orthogonal to the Y directions and the Z directions.

Piezoelectric drive device and robot

A piezoelectric driving device includes a substrate, a plurality of piezoelectric elements disposed on the substrate, a first groove section provided between the plurality of piezoelectric elements, and a first wire provided in at least a part of a side surface and a bottom section of the first groove section.

Piezoelectric driving device and robot comprising the same

There is configured an oscillator including a resonator, and a circuit device, wherein the circuit device includes a first terminal, a storage circuit configured to store data corresponding to an external signal input from the first terminal, an oscillation circuit configured to generate an oscillation signal using the resonator, a counter circuit configured to count a period in which the external signal has a first polarity and a period in which the external signal has a second polarity using a clock signal generated based on the oscillation signal, and a processing circuit configured to write the data in the storage circuit based on a counting result of the counter circuit.

Oscillator and communication method

A piezoelectric actuator includes a vibrating section including a piezoelectric element, a distal end face, and a recess opened on the distal end face and a protrusion section including a base that overlaps the recess in plan view of the distal end face and is fixed to the distal end face and a projection that is provided in the base and projects in an opposite direction of the distal end face, the protrusion section transmitting a driving force of the vibrating section to a driven section. In plan view of the distal end face, the projection is disposed within a range of the recess.

Piezoelectric actuator, piezoelectric motor, and robot

A frequency measurement circuit includes a first counter that counts a pulse number of a reference clock signal and generates first count data, a second counter that counts a pulse number of a measurement target clock signal and generates second count data, a time-to-digital conversion circuit that generates first time difference data indicating a time difference between a first timing at which the first counter starts counting of the pulse number and a second timing at which the second counter starts counting of the pulse number, and second time difference data indicating a time difference between a third timing at which the first counter ends counting of the pulse number and a fourth timing at which the second counter ends counting of the pulse number, and a calculation circuit that performs calculation based on the second count data, the first time difference data, and the second time difference data and generates frequency data indicating a frequency of the measurement target clock signal.

Frequency measurement circuit and frequency measurement apparatus

A piezoelectric driving device includes a vibrating portion including a piezoelectric element for driving and a piezoelectric element for detection and vibrating by driving of the piezoelectric element for driving, a drive circuit that generates a drive signal for driving the piezoelectric element for driving, and a detection circuit that detects vibration of the vibrating portion based on a detection signal output from the piezoelectric element for detection with the vibration of the vibrating portion, wherein the piezoelectric element for detection is placed in an area containing a center of the vibrating portion.

Piezoelectric driving device having a detection element at the center of a vibrating portion

A piezoelectric drive device includes a vibrating part, and a control unit that controls vibration of the vibrating part, wherein the vibrating part includes a piezoelectric material having a first surface and a second surface in a front-back relation, a drive electrode having a first electrode arranged at the first surface and a second electrode arranged at the second surface, and vibrating the piezoelectric material when a drive signal from the control unit is input to the second electrode, and a detection electrode having a third electrode arranged at the first surface and a fourth electrode arranged at the second surface, and outputting a detection signal according to the vibration of the piezoelectric material to the control unit via the fourth electrode, and the first electrode and the third electrode are separated on the first surface, and the second electrode and the fourth electrode are separated on the second surface.

Piezoelectric drive device, robot, and printer

A piezoelectric drive device has a first piezoelectric vibrator and a second piezoelectric vibrator each include a vibrating portion and a distal end portion in which the distal end portion make elliptic motion by stretching vibration and flexural vibration of the vibrating portion, a driven member driven by the elliptic motion of the distal end portion, a drive signal generation circuit that outputs stretching vibration drive signals to the first piezoelectric vibrator and the second piezoelectric vibrator, a first boosting circuit provided between the first piezoelectric vibrator and the drive signal generation circuit, a second boosting circuit provided between the second piezoelectric vibrator and the drive signal generation circuit, and a control circuit that controls boosting amounts of the stretching vibration drive signals.

A piezoelectric driving device includes a first substrate having cleavability, and a piezoelectric element placed above the first substrate, wherein a cleavage direction of the first substrate and a direction in which a shear force is applied do not coincide in a plan view of the first substrate. Further, an angle formed by the cleavage direction of the first substrate and the direction in which the shear force is applied is equal to or larger than 20&#xb0; in the plan view of the first substrate. Furthermore, the first substrate contains silicon single crystal.

Piezoelectric driving device, piezoelectric motor, robot, electronic component conveyance apparatus, printer, and projector

A circuit device includes an oscillation circuit and a processing circuit. The oscillation circuit includes a variable capacitance circuit configured by a capacitor array and oscillates at an oscillation frequency corresponding to the capacitance value of the variable capacitance circuit. First temperature data and second temperature data subsequent to the first temperature data are input to the processing circuit as temperature data. In the period between the start of the capacitance control based on the first temperature data and the start of the capacitance control based on the second temperature data, the processing circuit switches the first capacitance control data corresponding to the first temperature data and the second capacitance control data different from the first capacitance control data in a time-division manner to be output to the variable capacitance circuit.

Circuit device, oscillator, real-time clock device, electronic device, and vehicle

A piezoelectric drive device includes first and second piezoelectric vibration modules pressed toward a driven portion and including a vibration portion and a transmission portion abutting the driven portion and transmitting vibration to the driven portion and a controller. A pressing force of the second module to the driven portion is greater than that of the first module. The controller drives the second module so that the transmission portion of the second module performs longitudinal vibration vibrating in the pressing direction while driving the first module so that the transmission portion of the first module performs bending vibration that is a composite of longitudinal vibration in a pressing direction and lateral vibration intersecting the pressing direction.

Piezoelectric drive device, drive method of piezoelectric drive device, robot, electronic component transport apparatus, printer, and projector

A piezoelectric actuator includes a vibrating plate having a piezoelectric material, and a contact part provided in an end portion of the vibrating plate in contact with a driven part, wherein the contact part has a first portion in contact with the driven part and a second portion provided between the first portion and the vibrating plate and having lower rigidity than the first portion. Further, a width of the second portion in a direction crossing an arrangement direction of the first portion and the second portion is smaller than a width of the first portion in the crossing direction.

Piezoelectric actuator, piezoelectric motor, robot, and electronic component conveyance apparatus

A piezoelectric drive apparatus for a motor, the apparatus including a substrate having a longitudinal direction and a widthwise direction perpendicular to the longitudinal direction, a piezoelectric element provided on the substrate and having a first electrode, a second electrode, and a piezoelectric body positioned between the first electrode and the second electrode, and a contact section that is attached to a front end section of the substrate in the longitudinal direction thereof or in contact with the front end section of the substrate in the longitudinal direction thereof and comes into contact with a driven body, wherein the longitudinal direction of the substrate roughly coincides with a direction in which Young's modulus is minimized in a plane of the substrate.

Piezoelectric drive apparatus for motor and method for manufacturing the same, motor, robot, and pump

A piezoelectric driving device includes: a substrate including a fixed portion, and a vibrating body portion which is provided with a piezoelectric element and is supported by the fixed portion; and a contact portion which comes into contact with a driven body, and transmits movement of the vibrating body portion to the driven body, the contact portion is provided at an end portion in the longitudinal direction of the vibrating body portion, and a difference between a distance between the end portion when the contact portion is not pressed against the driven body and a tip end of the contact portion, and a distance between the end portion when the contact portion is pressed against the driven body and the tip end, is smaller than a total amplitude in the longitudinal direction in a case where the vibrating body portion is driven.

Growing community of inventors

Matsumoto, Japan

Tomoaki Takahashi