Canon Kabushiki Kaisha

University of Yamanashi

Tokyo Institute of Technology

Kyoto University

National Institute of Advanced Industrial Science and Technology

Sophia School Corporation

Tokyo University of Science Educational Foundation Administrative Organization

Sophia University

Fuji Chemical Company, Limited

Jumpei Hayashi

Tatsuya Suzuki

Makoto Kubota

Tatsuo Furuta

Takayuki Watanabe

Takanori Matsuda

Shinya Koyama

Toshihiro Ifuku

Koji Suzuki

Yasushi Shimizu

Hidenori Tanaka

Kanako Oshima

Akira Uebayashi

Kaoru Miura

Nobuhiro Kumada

Hisato Yabuta

Kenichi Takeda

Shunsuke Murakami

Hiroshi Funakubo

Miki Ueda

Satoshi Wada

Hiroshi Uchida

Masami Tsukamoto

Zuyi Zhang

Kenji Maeda

Tetsuro Fukui

Hiroshi Saito

Hideaki Takahashi

Mikio Shimada

Masaki Azuma

Takashi Iijima

Soichiro Okamura

Kenichi Akashi

Toshiaki Aiba

Shintaro Yasui

Olga Alexandrovna Smirnova

Jun-ichi Nagata

Tomoaki Mochiduki

Hitoshi Nishitani

Kenji Takashima

Fumio Uchida

Satoshi Fujita

Toshifumi Urakami

Kaishi Ohashi

Masatoshi Watanabe

Chiemi Shimizu

Yoshitaka Nakamura

Tomoaki Yamada

Yuichi Shimakawa

Keisuke Yamato

Kazuki Matsushima

Keisuke Yazawa

Masanori Kawai

Ichiro Fujii

Ryuta Mitsui

Tomoaki Masubuchi

Takahiro Oikawa

Yuki Iitsuka

Jyunichi Nagata

The present invention provides a vibrator made of a non-lead-based piezoelectric material and capable of being driven at a sufficient speed with low power consumption, and provides a vibration wave drive device and an electronical device each using the vibrator. To that end, the vibrator according to the present invention includes a piezoelectric element including a piezoelectric material and electrodes, and an elastic body, wherein a Pb component contained in the piezoelectric material is less than 1000 ppm, and a resonance frequency fin a vibration mode A and a resonance frequency fin a vibration mode B satisfy a relation of an absolute value of (f&#x2212;f)&#x3e;2 (kHz), the vibration mode A and the vibration mode B generating vibration waves in the elastic body with wave fronts of the vibration waves intersecting each other.

Vibrator, vibration wave drive device, vibration wave motor, and electronical device

Provided is a method of manufacturing a piezoelectric element in which, at a time when the piezoelectric element is manufactured, a piezoelectric material is prevented from being exposed to a temperature higher than a Curie temperature thereof to be depolarized, to thereby significantly decrease piezoelectric properties. The method of manufacturing a piezoelectric element includes a first step of arranging a plurality of electrodes on a piezoelectric material, electrically short-circuiting two or more electrodes of the plurality of electrodes, and subjecting the piezoelectric material to heat treatment, and a second step of, after the first step, electrically opening the short circuit of the two or more electrodes at a time when a temperature of the piezoelectric material decreases to less than a temperature of the piezoelectric material at a time of the heat treatment.

Method of manufacturing piezoelectric element, method of manufacturing oscillatory wave motor, method of manufacturing optical apparatus, and method of manufacturing electronic apparatus

Provided is a method of manufacturing an oscillator, including: arranging an electrode on a piezoelectric ceramics free from being subjected to polarization treatment, to thereby provide a piezoelectric element; bonding the piezoelectric element and a diaphragm to each other at a temperature T; bonding the piezoelectric element and a power supply member to each other at a temperature T; and subjecting the piezoelectric ceramics to polarization treatment at a temperature T, in which the temperature T, the temperature T, and the temperature Tsatisfy a relationship T&#x3e;Tand a relationship T&#x3e;T

Method of manufacturing an oscillator

A piezoelectric element includes a piezoelectric material layer and an electrode layer, wherein the piezoelectric material layer and the electrode layer are stacked on top of each other, the piezoelectric material layer includes a barium titanate-based material, and two coercive fields Ecand Ecof the piezoelectric element have the same sign and satisfy (|EcEc|)&#x2265;8 kV/cm.

Piezoelectric element, vibrator, vibration wave motor, optical apparatus, and electronic apparatus

A vibrator which is constructed by bonding a piezoelectric element and an elastic body together via a bonding layer. The piezoelectric element has a piezoelectric ceramic and electrodes. The bonding layer has an unbonded region that is located close to a nodal line of a vibration in a primary out-of-plane vibration mode when the vibration is excited in the vibrator, and in the unbonded region, the piezoelectric element and the elastic body are not bonded together.

Vibrator with low power consumption, vibration type actuator, and electronic apparatus

A piezoelectric element, in which a piezoelectric material layer has a plurality of crystal particles and a plurality of void portions and, in at least one of two or more of the piezoelectric material layers, when the average thickness in the lamination direction of the piezoelectric material layer is defined as T, the average circle-equivalent diameter of the plurality of crystal particles is defined as D, the maximum length in the lamination direction of the plurality of void portions not contacting the electrode layers is defined as L, and the average thickness of the electrode layers contacting the at least one piezoelectric material layer is defined as T, 0.07T&#x2264;D&#x2264;0.33Tand T&#x2264;L&#x2264;0.3Tare established and the lead content is less than 1000 ppm.

Piezoelectric element, vibrator, vibration wave motor, optical device, and electronic device

Provided is an ultrasonic motor including an annular vibrator and an annular moving member that is brought into pressure-contact with the vibrator. The vibrator includes an annular vibrating plate and an annular piezoelectric element. The piezoelectric element includes an annular lead-free piezoelectric ceramic piece, a common electrode arranged on one surface of the piezoelectric ceramic piece, and a plurality of electrodes arranged on the other surface of the piezoelectric ceramic piece. The plurality of electrodes include two drive phase electrodes, one or more non-drive phase electrodes, and one or more detection phase electrodes. A second surface of the vibrating plate includes a plurality of groove regions extending radially, and the depths of the groove regions change in a circumferential direction along a curve obtained by superimposing one or more sine waves on one another. The ultrasonic motor exhibits a sufficient drive speed while suppressing generation of an unnecessary vibration wave.

Ultrasonic motor, drive control system, optical apparatus, and vibrator

An ultrasonic motor, usable in a drive control system and the like, includes an annular vibrator and an annular moving member arranged so as to be brought into pressure-contact with the vibrator. The vibrator includes an annular vibrating plate and an annular piezoelectric element. The piezoelectric element includes an annular piezoelectric ceramic piece, a common electrode arranged on one surface of the piezoelectric ceramic piece, and a plurality of electrodes arranged on the other surface of the piezoelectric ceramic piece. The piezoelectric ceramic piece contains lead in a content of less than 1,000 ppm. The plurality of electrodes include two drive phase electrodes, one or more non-drive phase electrodes, and one or more detection phase electrodes.

A vibrator and an ultrasonic motor can exhibit a sufficient drive speed even when using lead-free piezoelectric ceramics. The ultrasonic motor includes an annular vibrator and an annular moving member arranged so as to be brought into pressure-contact with the vibrator. The vibrator includes an annular vibrating plate and an annular piezoelectric element. The piezoelectric element includes an annular piezoelectric ceramic piece, a common electrode arranged on one surface of the piezoelectric ceramic piece, and a plurality of electrodes arranged on the other surface of the piezoelectric ceramic piece. The piezoelectric ceramic piece contains lead in a content of less than 1,000 ppm. The plurality of electrodes include two drive phase electrodes, at least one non-drive phase electrode, and at least one detection phase electrode.

A lead-free piezoelectric element that stably operates in a wide operating temperature range contains a lead-free piezoelectric material. The piezoelectric element includes a first electrode, a second electrode, and a piezoelectric material that includes a perovskite-type metal oxide represented by (BaCa)(TiZr)O(1.00&#x2264;a&#x2264;1.01, 0.02&#x2264;x&#x2264;0.30, 0.020&#x2264;y&#x2264;0.095, and y&#x2264;x) as a main component and manganese incorporated in the perovskite-type metal oxide. The manganese content relative to 100 parts by weight of the perovskite-type metal oxide is 0.02 parts by weight or more and 0.40 parts by weight or less on a metal basis.

Piezoelectric element, multilayered piezoelectric element, liquid discharge head, liquid discharge apparatus, ultrasonic motor, optical apparatus, and electronic apparatus

A barium titanate piezoelectric ceramic having good piezoelectric properties and mechanical strength and a piezoelectric element that includes the ceramic are provided. A method for making a piezoelectric ceramic includes forming a compact composed of an oxide powder containing barium titanate particles, sintering the compact, and decreasing the temperature of the compact after the sintering. The sintering includes (A) increasing the temperature of the compact to a first temperature within a temperature range of a shrinking process of the compact; (B) increasing the temperature of the compact to a second temperature within a temperature range of a liquid phase sintering process of the compact after (A); (C) decreasing the temperature of the compact to a third temperature within the temperature range of the shrinking process of the compact after (B); and (D) retaining the third temperature after (C).

Piezoelectric ceramic, method for making the same, piezoelectric element, liquid discharge head, ultrasonic motor, and dust cleaner

There is provided a lead-free piezoelectric material having a satisfactory piezoelectric constant and mechanical quality factor in the range of device operating temperatures (from &#x2212;30&#xb0; C. to 50&#xb0; C.). The piezoelectric material contains a main constituent containing a perovskite-type metal oxide expressed by the general formula (BaCa)(TiZr)O, where x, y and a satisfy the 0.030&#x2264;x&#x3c;0.090, 0.030&#x2264;y&#x2264;0.080, and 0.9860&#x2264;a&#x2264;1.0200. The material also contains 0.040 to 0.500 part by weight of Mn, 0.042 to 0.850 part by weight of Bi, 0 to 0.028 part by weight of Li, 0.001 to 4.000 part by weight of a third sub-constituent including at least one of Si and B, and 0.001 to 4.000 parts by weight of Cu, each in terms of element relative to 100 parts by weight of the metal oxide.

Piezoelectric material, piezoelectric element, and electronic apparatus

The piezoelectric material of the present invention includes a main component composed of a perovskite-type metal oxide represented by Formula (1), at least one of Mn and Ni, and Mg. The content of Ni is 0 mol or more and 0.05 mol or less based on 1 mol of the perovskite-type metal oxide, and the content of Mn is 0 mol or more and 0.005 mol or less based on 1 mol of the perovskite-type metal oxide, provided that the content of Mn and the content of Ni are not simultaneously 0 mol. The content of Mg is 0.001 mol or more and 0.020 mol or less based on 1 mol of the perovskite-type metal oxide. Formula (1): (NaBa)(NbTi)O(where x is 0.83 or more and 0.95 or less, y is 0.85 or more and 0.95 or less, and x/y is 0.95 or more and 1.05 or less).

Piezoelectric material, method of producing piezoelectric material, piezoelectric element, and electronic apparatus

The piezoelectric material of the present invention includes a main component composed of a perovskite-type metal oxide represented by Formula (1), Zn, and Mg. The content of Zn is 0.005 mol or more and 0.050 mol or less based on 1 mol of the perovskite-type metal oxide, and the content of Mg is 0.001 mol or more and 0.020 mol or less based on 1 mol of the perovskite-type metal oxide. Formula (1): (NaBa)(NbTi)O(where x is 0.83 or more and 0.95 or less, y is 0.85 or more and 0.95 or less, and x/y is 0.95 or more and 1.05 or less).

There is provided a lead- and potassium-free piezoelectric material having a high piezoelectric constant and a satisfactory insulation property and a piezoelectric element that includes the piezoelectric material. The piezoelectric material contains a perovskite-type metal oxide having the general formula (1): (NaBa)(NbTi)O(wherein x satisfies 0.80&#x2264;x&#x2264;0.95, and y satisfies 0.85&#x2264;y&#x2264;0.95); and at least one rare-earth element selected from La, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, wherein the rare-earth element content is more than 0 mol % and 5 mol % or less of the amount of perovskite-type metal oxide. The piezoelectric element includes the piezoelectric material.

Piezoelectric material, piezoelectric element, and electronic equipment

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Yokohama, Japan

Jumpei Hayashi