Seiko Epson Corporation

Seiko Corporation

Seiko Epscon Corporation

Yasuharu Hashimoto

Osamu Miyazawa

Tsukasa Funasaka

Makoto Furuhata

Hajime Miyazaki

Osamu Takahashi

Akio Konishi

Atsuya Hirabayashi

Akira Matsuzawa

Yutaka Arakawa

Tomohisa Iwazaki

Akihito Matsumoto

Eiichi Nagasaka

Yuichiro Tsuyuki

An atomic oscillator including an oscillator that outputs an oscillation signal, a light emitter to which a signal based on the oscillation signal is inputted, an atomic cell, a light receiver that detects the light passing through the atomic cell and outputs a detection signal, a first temperature controller, and a control circuit, and the control circuit has a first mode including the process of operating the light emitter and the first temperature controller and the process of causing the oscillator to output the oscillation signal, a second mode including the process of causing the light emitter and the first temperature controller to stop operating and the process of causing the oscillator to stop outputting the oscillation signal, and a third mode including the process of causing the light emitter to stop operating, the process of operating the first temperature controller, and the process of causing the oscillator to stop outputting the oscillation signal.

Atomic oscillator and frequency signal generation system

A piezoelectric drive device includes a vibrating body, a support portion formed integrally with the vibrating body, and a piezoelectric element formed of a first electrode film, a piezoelectric body film, and a second electrode film on at least one surface of the vibrating body.

Piezoelectric drive device, robot, and method for driving piezoelectric drive device

A piezoelectric driving device includes a piezoelectric body; an electrode provided on the piezoelectric body; and a driving circuit which applies a driving voltage to the electrode, wherein the piezoelectric body has a thickness of 0.05 &#x3bc;m to 20 &#x3bc;m, and the driving voltage is a voltage obtained by adding an offset voltage to a fluctuating voltage.

Piezoelectric driving device, robot, and driving method of the same

A piezoelectric driving device includes a vibrating plate, a first piezoelectric vibrating body which is disposed on the first surface of the vibrating plate; a second piezoelectric vibrating body which is disposed on the second surface of the vibrating plate; and a protrusion which is provided on the vibrating plate and comes into contact with a body to be driven, wherein the first piezoelectric vibrating body and the second piezoelectric vibrating body have asymmetry that the first piezoelectric vibrating body and the second piezoelectric vibrating body are asymmetrical to each other with respect to the vibrating plate.

A fluid injection system includes: a first apparatus which is attached to a human body and injects a fluid into the human body; and a second apparatus which is attached to a wrist of the human body and remotely controls the first apparatus, wherein the second apparatus includes an entry section accepting an entry of an operation command to the first apparatus and a first communicating section transmitting the operation command to the first apparatus, and the first apparatus includes a second communicating section receiving the operation command, a storing section storing the fluid, and a transporting section transporting the fluid from the storing section and injecting the fluid into the human body based on the operation command.

Fluid injection system

A piezoelectric motor includes a piezoelectric element having a piezoelectric layer, and a first and a second electrodes, the first electrode provided on one surface side of the piezoelectric layer, and the second electrode provided on the other surface side of the piezoelectric layer; a piezoelectric actuator having a vibrating member anchored to the first electrode of the piezoelectric element; and a rotational shaft with which the vibrating member makes contact and is rotated thereby. The piezoelectric layer includes a vertical vibration excitation region, provided toward the center of the piezoelectric layer in the widthwise direction, that elicits vertical vibrations, and two groups of bending vibration excitation regions, one group disposed on either side of the vertical vibration excitation region so that two opposing diagonal pairs are formed; and the polarization direction of the vertical vibration excitation region and one of the groups of the bending vibration excitation regions in the piezoelectric layer is inverted relative to the other group of the bending vibration excitation regions.

Piezoelectric motor, liquid ejecting apparatus, and clock

A method for driving an ultrasonic motor having an actuator section includes: a step of starting the ultrasonic motor by applying an AC voltage with a first frequency to the actuator section; a voltage detection step of detecting a voltage generated at the actuator section while lowering a driving frequency from the first frequency to a second frequency at which the ultrasonic motor stops; a starting step of starting the ultrasonic motor with a third frequency; and a driving step of changing the driving frequency from the third frequency to a lower frequency such that the driving frequency has a value within an operation frequency range, wherein the operation frequency range is within a range on a higher frequency side than the driving frequency at which a maximum voltage is detected in the voltage detection step.

Method for driving ultrasonic motor

A piezoelectric vibrator includes: a flat plate piezoelectric element, the piezoelectric vibrator vibrating in a mixed mode of stretching vibration that generates a displacement in a first direction within a plane of the piezoelectric element and a bending vibration that generates a displacement in a second direction orthogonal to the first direction; a vibrating member provided with the piezoelectric element and vibrated by applying voltage on the piezoelectric element; a support member provided on the vibrating member to support the vibrating member in a vibratable manner the support member being provided on an outer edge of the vibrating member at a position adjacent to anti-node other than free end of the bending vibration, the support member including a first support section extending in a direction approximately orthogonal to the first direction and a second support section extending in a direction approximately orthogonal to the direction in which the first support section extends; and a fixing portion provided on the support member to be fixed on an object on which the piezoelectric vibrator is attached.

Piezoelectric vibrator, intrinsic frequency adjusting method of piezoelectric vibrator, piezoelectric actuator and electronic device

A piezoelectric actuator includes: a ring-shaped piezoelectric element, vibration of the piezoelectric element being transmitted to an object; a first vibration area and a second vibration area provided on both sides of a bisector bisecting the piezoelectric element along a diameter of the piezoelectric element, the first vibration area and the second vibration area being respectively provided with at least one drive electrode to which a drive signal is supplied, the drive electrode being arranged substantially axisymmetrically with respect to the bisector, the drive signal including a phase-advance drive signal and a phase-delay drive signal having a predetermined drive phase difference, the phase-advance drive signal that is phase-advanced relative to the phase-delay drive signal being supplied to one of the first vibration area and the second vibration area and the phase-delay drive signal that is phase-delayed relative to the phase-advance drive signal being supplied to the other of the first vibration area and the second vibration area; and a detection electrode that detects vibrating condition of the piezoelectric element to output a vibration signal, the detection electrode being provided on at least one of the first vibration area and the second vibration area to which the phase-delay drive signal is supplied, the drive of the piezoelectric actuator being controlled based on a detected phase difference between one of the phase-advance drive signal and the phase-delay drive signal and the vibration signal.

Piezoelectric actuator, drive control method of piezoelectric actuator, and electronic device

A rectangular vibrating platein which a piezoelectric element and a reinforcing plate are stacked is supported on a main plate by a support member, and is urged toward the rotorby an elastic force of the support member. This brings a projectionprovided on the vibrating plateinto abutment with an outer peripheral surface of the rotor. In this construction, when the vibrating platevibrates in the horizontal direction in the figure by an applied voltage from a driving circuit (not shown), the rotoris rotated in a clockwise direction in accordance with the displacement of the projectiondue to the vibration.

Piezoelectric actuator, timepiece, and portable device

An ultrasonic motor of the present invention has a vibrating element. The vibrating elementincludes a first piezoelectric elementthat undergoes extension and contraction by application of an AC voltage, a reinforcing platehaving a contact portionand an arm portion, and a second piezoelectric elementthat undergoes extension and contraction by application of an AC voltage. The first piezoelectric element, the reinforcing plate, and the second piezoelectric elementare laminated in this order. The vibrating elementis fixedly mounted through the arm portionso that the contact portionabuts on a driven element (rotor). Further, the vibrating elementhas a body portion and a length L of the body portion in a direction in which the vibrating elementextends and contracts by application of the AC voltage is 1 to 20 mm.

Ultrasonic motor, an operating apparatus, an optical apparatus and an electric instrument

An optical gyroscope () has a detection light guide body (S) and a light measuring board (). The detection light guide body (S) is formed by stacking light guide layers () and protective layers () alternately. An eddy-shaped light guide path section is provided in each of the light guide layers (), and the light guide path sections are optically connected to each other through said protective layers () to form an integral light guide path (L). One end (La) of the light guide path (L) is directly connected to the light measuring board (), and another end (Lb) of the same is connected to the light measuring board () through an optical fiber ().

Growing community of inventors

Minamiminowa, Japan

Yasuharu Hashimoto