2025カリキュラム(改組・工学部課程化，他)

2023カリキュラム(GX科目必修化)を含む検討委員会・全4回

障がい学生支援に関するガイドライン策定

教務委員会副委員長として

STAC活用専門部会より移行

2016年度はオブザーバ参加(安否確認システム改修事案)

教務委員会副委員長として。学修成果の可視化専門部会へ移行・完了

2018.3.22学長に答申。2018.4.20教授会報告事項(8)

第5回WGより，主にポートフォリオ関連で参加

2017.06.01より新システム稼働。同月，旧システムクローズ。これをもって移行完了とする。

教学分析(2019.04よりIR推進委員に移行)

教務委員会副委員長として

教務部次長より名称変更

ポータル及び教務サブシステム，ならびにIRシステムに関して。基本設計と年次改修諸検討

2014年度は教務部次長と，T学科教務委員の兼任

河野委員の補佐として，業務引継および学科教務データ蓄積・共有システム構築等。

Language：English   Publishing type：Research paper (scientific journal)  

researchmap

Language：English  

DOI： 10.7567/1347-4065/ab1bd5

researchmap

Language：English  

DOI： 10.3390/act7010008

researchmap

Language：Japanese   Publisher：公益社団法人 精密工学会  

通常，球面超音波モータでは球状ロータが用いられてきた。本研究では球状ステータを用いて任意形状のロータを駆動する方式について検討する。本報告では，球体および球殻に複数の振動モード回転を発生させ，球体表面上より，駆動力を発生する方法について検討した結果について述べる。球体の振動モードは表面上に設けた励振源と駆動用突起を用いることに駆動力を取り出すことができる。また，球殻では内部での励振方法を検討した。

DOI： 10.11522/pscjspe.2017S.0_195

CiNii Research

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.7567/JJAP.55.07KE18

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.sna.2012.11.045

Web of Science

researchmap

Language：English   Publisher：The Japan Society of Applied Physics  

A novel linear motion ultrasonic motor, which uses a single resonance mode driven by a single phase and has the same motor characteristics for operation in reverse directions, is developed. An in-plane breathing mode in the square plate is strongly driven by the transverse effect of a piezoelectric ceramic. A stator resonator consists of twin square plates linked by V-shaped beams. Only one side of the square plate can be excited by the resonance of the breathing mode, when the other passive side plate is electrically opened so that the effective elasticities and the resonant frequencies between both plates are different; as a result, the friction edge of the resonator vibrates in a slant locus to move a load slider. The reverse operation is easily obtained by switching the driving side of the square plates. We designed the stator resonator by FEM analysis and fabricated a prototype for our experiment. The prototype motor showed good characteristics, for example, a moving slider velocity of 100 mm/s, a thrust force of 3.5 N, and an efficiency of 30% when the preload was 10 N, the input effective voltage was 5 V, and the input power was 1.2 W.

DOI： 10.7567/JJAP.52.07HE03

CiNii Research

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Applied Physics  

We investigated why the nonlinear behaviors of (Bi,Na,Ba)(Ti,Mn)O3 (BNBTM) ceramics and (Sr,Ca) 2 NaNb 5 O 15 (SCNN) ceramics occur in comparison with Pb(Zr,Ti)O3-based (PZT) ceramics by evaluating their high-power properties with the distinction between mechanical nonlinearity and temperature dependence of properties. The equivalent stiffness of PZT decreased with increasing vibration velocity and sample temperature. However, the equivalent stiffnesses of BNBTM and SCNN did not depend on vibration velocity, they decreased and increased linearly with an increase in sample temperature, respectively. The nonlinear behavior of PZT originated from the soft-spring effect through which the mechanical nonlinearity was induced and the temperature dependence of stiffness was enhanced. On the other hand, it appeared that the nonlinear behaviors of BNBTM and SCNN originated from the apparent soft- and hard-spring effects through which the temperature dependence of stiffness was induced. The temperature characteristic of elasticity is important for controlling the high-power properties. ? 2013 The Japan Society of Applied Physics.

DOI： 10.7567/JJAP.52.07HE01

CiNii Research

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

We investigated the high-power properties of lead-free piezoelectric ceramics with (Sr,Ca) 2 NaNb 5 O 15 (SCNN), and clarified the properties of miniature cantilever-type ultrasonic motor of array-type multilayer piezoelectric ceramics of SCNN (SCNN-A-MLPC) as the lead-free-piezoelectric application. The jump phenomena of SCNN ceramics with constant-voltage driving produced mirror-reversed images relative to those of Pb(Zr,Ti)O 3 -based (PZT) ceramics. The nonlinear behavior was caused by the hard-spring effect of SCNN ceramics which possess notable elastic properties among the piezoelectric materials. Under high vibration velocity with constant-motional-current driving, SCNN ceramics showed that the temperature rise was lower than that of PZT ceramics and the degradation of the quality factor was limited, resulting in a gradual increase in the equivalent mechanical resistance. SCNN ceramics have superior high-power properties. The cantilever-type ultrasonic motor was fabricated using SCNN-A-MLPC and the driving properties were evaluated. The output power of the motor increased linearly with increasing input power up to 110 mW without heat generation. The output power density was high in comparison with that of the commercialized motor of PZT ceramics. Furthermore, the refined motor with build in preload mechanism was fabricated and the driving properties were evaluated. The motor was able to rotate with 200 rpm and 40 μN m at 2.6 V p-p . It appeared that the motors have a high potential as an environmental friendly piezoelectric device with excellent properties, reflecting the high-power properties of SCNN ceramics. ? 2012 Elsevier Ltd and Techna Group S.r.l.

DOI： 10.1016/j.ceramint.2012.10.169

researchmap

Language：Japanese   Publisher：公益社団法人 精密工学会  

超音波アクチュエータに圧電クラッチを組み合わせることで，電気的に予圧制御可能なアクチュエータを実現している。本報告では、一軸回転型ハイブリッドアクチュエータシステム（AS）を拡張し，2自由度ハイブリッドASの試作および力覚提示例について述べる。一軸回転型ハイブリッドASを２組用いることで２自由度ハイブリッドASを実現した。また，試作したASの圧電クラッチを用いて仮想壁をなぞる動作の提示を実現した。

DOI： 10.11522/pscjspe.2013A.0.177.0

CiNii Research

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Applied Physics  

The high-power piezoelectric characteristics of c-axis crystal-oriented (Sr,Ca) 2 NaNb 5 O 15 (SCNN) ceramics were studied by the constantmotional-current driving method, and compared with those of the randomly oriented ceramics superior to those of hard Pb(Ti,Zr)O 3 (PZT)ceramics. The c-axis crystal-oriented SCNN ceramic showed a large Lotgering factor of 0.98. The effective piezoelectric constant d33 was 260 pm/V, as large as those of hard PZT ceramics. In the 31-mode of the rectangular plate, the quality factor, Q, was five times larger than that of the randomly oriented ceramic, and almost constant at approximately 3300 up to the maximum vibration velocity of 1.84 m/s rms. The resonant frequency change was also stable up to a vibration velocity of 1.84 m/s rms. The change was approximately +0.05% in the driving range, which was much smaller than that of +0.8% of the randomly oriented ceramic. The high-power piezoelectric characteristics were also clarified by a comparison with the mechanical characteristics. Therefore, the highly c-axis crystal-oriented SCNN ceramics are good candidates for high-power piezoelectric applications in comparison with hard PZT ceramics. ? 2012 The Japan Society of Applied Physics.

DOI： 10.1143/JJAP.51.09LD02

CiNii Research

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1143/JJAP.51.07GE08

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Applied Physics  

The properties of miniature cantilever-type ultrasonic motors using lead-free array-type multilayer piezoelectric ceramics of (Sr,Ca) 2 NaNb 5 O 15 (SCNN) developed using the design rule were investigated under high input power by comparison with the high-power properties of SCNN ceramics. The frequency dependence of the revolution speed reflected the nonlinear behavior of SCNN ceramics with the hard-spring effect and showed a mirror-reversed image relative to that of the motor of Pb(Zr,Ti)O 3 (PZT) ceramics. The output power increased linearly with increasing input power up to 110mW without heat generation, and the driving properties were almost the same as the expectations under low input power. The output power density characteristics of the motors were high in comparison with those of the commercialized motors of PZT ceramics. It appeared that the motors have a high potential as an environmental friendly piezoelectric device with excellent properties, reflecting the highpower properties of SCNN ceramics. ? 2012 The Japan Society of Applied Physics.

DOI： 10.1143/JJAP.51.07GE10

CiNii Research

researchmap

Language：Japanese   Publisher：The Japan Society for Precision Engineering  

DOI： 10.11522/pscjspe.2012A.0.89.0

CiNii Research

researchmap

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1063/1.3703276

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1143/JJAP.50.09ND06

Web of Science

researchmap

Language：English  

DOI： 10.1143/JJAP.50.07HE22

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1143/JJAP.50.07HC11

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1143/JJAP.50.07HE29

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1143/JJAP.50.07HE22

Web of Science

researchmap

Language：Japanese   Publisher：電気関係学会東北支部連合大会実行委員会  

DOI： 10.11528/tsjc.2011.0_188

CiNii Research

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Applied Physics  

We studied the following to clarify the design rule of the miniature cantilever-type ultrasonic motor using lead-free array-type multilayer piezoelectric ceramics, which is (Sr,Ca) 2 NaNb 5 O 15 . The relationship between the motor properties and stator vibrator dimensions was investigated by the finite element method and vibration analysis. The motor properties mainly depended on the cantilever sizes. The motor properties can be especially controlled from the revolution-speed-oriented type to the torque-oriented type by adjusting the vamplate radius of the cantilever. As a result, the design rule was clarified. In accordance with the design rule, the lead-free torque-oriented motor was fabricated and its properties were evaluated. The driving properties of this motor changed to the torque-oriented characteristics, such as the ratio of the maximum torque to the maximum speed was over 1200-fold of that of the motor fabricated in a previous study. It appeared that the driving properties of the lead-free cantilever-type motor can be controlled by using the design rule. ? 2010 The Japan Society of Applied Physics.

DOI： 10.1143/JJAP.49.07HE25

CiNii Research

researchmap

Language：English   Publishing type：Part of collection (book)   Publisher：Springer London  

DOI： 10.1007/978-1-84882-991-6_18

Scopus

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1143/JJAP.49.07HE26

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1143/JJAP.49.07HE24

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1143/JJAP.49.07HE16

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1143/JJAP.48.09KD10

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1143/JJAP.48.07GM08

Web of Science

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

Web of Science

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Other Link： http://search.jamas.or.jp/link/ui/2015338020

Language：Japanese   Publisher：日本工業出版  

CiNii Research

researchmap

Language：Japanese   Publisher：日本工業出版  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

An ordinal force-feedback device mainly employs an electromagnetic motor(EMM), and it is excellent in the expression of an elastic feeling. However, it is not easy to express the sense of hardness and roughness. An actuator system(AS) using multilayered piezoelectric actuators has a characteristic which is contrary to AS using EMM. The objective of this study is the development of ideal actuator system for a haptic display. In this paper, a hybrid actuator system combining an EMM with a piezoelectric motor was proposed and examined. As a results, it was confirmed to be able to express hardness and softness by changing the combination of actuators.

CiNii Research

researchmap

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

In this paper, we propose a novel rotor embedded disk type multi-degree-of-freedom (MDOF) spherical ultrasonic motor (SUSM). The MDOF-SUSM consists of a spherical rotor and a stator vibrator with all-in-one structure, the spherical rotor is embedded in a stator vibrator with a spherical inner surface, and a motor shaft is mounted on the rotor. The stator vibrator with piezoceramic disks and plates stuck on its surfaces can excite five vibration modes, independently and simultaneously. The spherical rotor of the motor can rotate around three axes by combining two vibration modes among the five vibration modes. This paper describes the basic construction and the operating principle of the rotor embedded type MDOF-SUSM, modal analysis results about the stator vibrator, and some measurement results from the first trial manufacture to verify the operating principle and research the Z-axis rotation. The MDOF-SUSM in this study has possibilities of a simple structure, compact and small size, lightweight, and a large torque-to-weight ratio.

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

The method of positioning of a levitated object above many aligned stator vibrators was proposed. From an experiment, an object moved to the next stator vibrator under the condition that the displacement of the next stator was over 1.5 times larger than that of the stator levitating the object. Hereafter, it is necessary to analyze the mechanism that the levitated object moves toward the next stator vibrator which has large displacement. Moreover, the reduction of an oscillation of the levitated object has to be considered for an accurate positioning. A rotary type NCS-USM shown in Fig. 7 can be proposed. Its operating principle is the same as NCS-USM. This motor has a possibility of high torque compared with ordinal non-contact USM using traveling wave.

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

researchmap

Other Link： http://hdl.handle.net/10258/657

researchmap

researchmap

Language：Japanese   Publisher：The Acoustical Society of Japan (ASJ)  

CiNii Research

researchmap

Other Link： http://hdl.handle.net/10258/1689

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese   Publisher：日本工業出版  

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

We have proposed the motor using a piezoelectric ceramic multilayer vibrator with diagonally symmetric form to construct a small size single-phase-drive motor. A diagonally symmetric form plate vibrating in the 1st longitudinal and the 2nd flexural modes which are coupled in the vibrator is presented. In this paper, we show a new supporting jig of small symmetrical vibrator and describe the experimental results for the trial ultrasonic motor (vibrator length: 15mm, rotor diameter: 1mm) whose revolution speed exceeds 9,000rpm, which is obtained by input voltage and power of 3Vrms and 300mW, respectively.

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

For analyzing intuitively and macroscopically the performance of an ultrasonic actuator, electromechanical equivalent circuits have been proposed and applied. However, the equivalent circuits include some nonlinear elements which are difficult to calculate directly by a circuit simulator. In this paper, to express the force transmission from a stator to rotor, the use of a voltage-controlled-voltage-source (VCVS) element provided on an ordinal circuit simulator is newly devised. Consequently, contact force and frictional one changing momentarily can be calculated with a commercial circuit simulator. As an example, the equivalent circuit of a vibrating-piece-type ultrasonic actuator was designed and simulated. It was obtained that simulated results of the transient response of rotation by preload control had good agreement with the experimental one.

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

An internal coupling effect resulting from the crystal anisotropy of LiNbO_3 can be applied to a single phase driven ultrasonic motor. We have used the rectangular stator vibrator with the length-width ratio of W/L=0.255 to obtain the mode-coupling between the in-plane longitudinal 1st and flexural 2nd modes. The rotation direction can be changed by selecting one of the two coupling-modes. However, big differences for vibration and motor characteristics exist between each coupling-mode. In this study, we inspect the motor design in another coupling condition of around W/L=0.8, and made trial motors using the stator vibrator of W/L=0.849. The new design of vibrator improved evenness of the electromechanical coupling factor between the modes. The motor which drives the rotor with a short-side of the stator shows that the rotation characteristics of both directions is similar in wide range of the preload force.

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

A rise time can be shorter by an electrical preload control with maintaining maximum revolution speed. The proposed equivalent circuit has possibility to easily simulate the performance of preload control.

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The contact type of an ultrasonic motor (USM) is usually operated under constant preload. It is well-known that a preload affects the performance of USM. However, there is no electrical preload control system, and the preload has not been utilized in a control. By a preload control, USM will possibly have a new performance e.g. the improvement of a transient response, the realization of torque free state for haptic interface. In order to change the preload of USM, the authors developed an ultrasonic actuator which can electrically control a preload. From some experiments, it was confirmed that this actuator can change a preload over wide range and that revolution speed and torque were widely controllable by a preload control.

CiNii Research

researchmap

Language：English  

DOI： 10.1143/JJAP.47.4034

Web of Science

researchmap

Language：English  

DOI： 10.1143/JJAP.47.4242

Web of Science

CiNii Research

researchmap

Language：English  

DOI： 10.1143/JJAP.47.4265

Web of Science

researchmap

Language：English  

DOI： 10.1143/JJAP.47.4015

Web of Science

researchmap

Language：English  

Web of Science

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：English  

Web of Science

researchmap

Language：Japanese   Publisher：日本工業出版  

CiNii Research

researchmap

Language：English  

Web of Science

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

The double-mode miniature cantilever-type ultrasonic motor was fabricated using the array-type multilayer piezoelectric ceramics (array-type MLPC) of (Sr, Ca)_2NaNb_5O_<15> (SCNN) such as Pb-free piezoelectric materials, and the electrical driving properties were investigated. The array-type MLPC was arranged in a 2x2 matrix on the actuators. The ultrasonic motor of SCNN array-type MLPC started to rotate at 1.7V_<p-p,>, and showed such characteristics as revolution speed of Ω_0=1000 rpm, a torque of T_0=2.6μNm at 9V_<p-p>. On the other hand, the motor using Pb (Zr, Ti)O_3-Pnb(Zn, Nb)O_3(PZT) showed Ω_0=1000 rpm, a torque of T_0=2.6μNm at 1V_<p-p>. SCNN motor was not so different from PZT motor, however the SCNN motor needed 10 times as high voltage as the PZT motor. By using the array-type MLPC, the driving voltage was reduced by a half, and the driving properties were improved.

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

We have proposed the motor using a piezoelectric ceramic multilayer vibrator with diagonally symmetric form to construct a small size single-phase-drive motor. A diagonally symmetric form plate vibrating in the 1st longitudinal and the 2nd flexural modes which are coupled in the vibrator is presented. The existence of the coupling-modes is confirmed by experimentally and the two vibration modes show the same results as the analysis by FEM. The characteristics of the trial motor using the vibrator are presented. We have confirmed that the motor using a piezoelectric multilayer vibrator is suitable for a high revolution speed motor at low input voltage and has relatively high efficiency characteristic.

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

A ring-type vibrator made of piezoelectric ceramics with an electrode divided into two along the diameter can excite an radial vibration and nonaxisymmetric one at the same time. The speed of ultrasonic linear motor can be easily controlled by the independent adjustment of each vibration mode, but that has not been considered in this linear motor. This paper describes that the excitation voltage for ((1,1))-mode can be linearly controlled with keeping the excitation voltage for (R,1)-mode constant by independently adjusting phase difference and voltages applied to both electrodes. The independent excitation of both modes can be realized and the speed of a slider can be linearly controlled.

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

This paper deals with an ultrasonic motor using single crystal LiNbO_3 as a lead-free piezo-material. A single phase drive ultrasonic motor is suitable for miniaturization. Thus, the authors have proposed a mode-coupling vibrator to obtain a single phase motor using a parallelogram shape as same construction using piezo-ceramic. However, the parallelogram vibrator has problems that the contact point for the rotor is easily sifted by a preload force. Additionally, the crystal characteristics are not utilized enough in its structure. In this paper, we propose a LiNbO_3 crystal motor of mode-couping symmetrical rectangular vibrator using an X-rotated Y-cut wafer with additional rotation in the y'-axis. The construction of a trial motor which is designed using finite element method analysis, and its experimental results are described.

CiNii Research

researchmap

Language：English  

DOI： 10.1143/JJAP.46.4709

Web of Science

CiNii Research

researchmap

Language：English  

DOI： 10.1143/JJAP.46.4698

Web of Science

CiNii Research

researchmap

Language：English  

DOI： 10.1143/JJAP.46.4921

Web of Science

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：English   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

The miniature cantilever-type ultrasonic motors were fabricated using the multilayer piezoelectric ceramics (MLPC) of PZT type piezoelectric materials and (Sr,Ca)_2NaNb_5O_<15> (SCNN) such as lead free piezoelectric materials, and investigated the properties of driving. The displacement of MLPC of PZT was 180nm at 10V and that of MLPC of SCNN was 170nm at 100V. The ultrasonic motor with MLPC of PZT was generated over 0.2 V_<p-p> and 4000rpm, 4.7μN at 6 V_<p-p>. On the other hand, the ultrasonic motor with SCNN was generated over 3 V_<p-p> and 570rpm at 20 V_<p-p>. It was confirmed that ultrasonic motor using lead free piezoelectric materials could generated at 10-fold voltage of MLPC of PZT.

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Ordinary ultrasonic actuators have an external preload mechanism using a spring. Support and preload mechanisms of a stator vibrator comprise some component parts. Such a structure prevents to make an ultrasonic actuator compact. The objective of this study is to make a small ultrasonic motor which can be easily miniaturized. Simple preload mechanism and support were realized by forming a stator vibrator and a flat spring for preload on an elastic metal plate bent into L-shape. From trial constructions of an ultrasonic spindle motor, the high-speed revolution of nearly 500rps was obtained.

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

For actualization of the monolithic triaxial gyrosensor, we have proposed a threefold rotatory symmetric form vibrator using quartz crystal Z-cut wafer which can be formed to the complex shape by the chemical etching. In the previously proposed vibrator, however, an etching residue brings the bilateral asymmetry on the detecting arms. The asymmetry causes the coupling among some vibration modes. Additionally, the previous vibrator has a high driving resistance which makes the self oscillation difficult. Therefore, we have designed the modified vibrator to improve the structural symmetry and to decrease the driving resistance. The modified vibrator has the improved mirror symmetry as well as the threefold symmetry, and also has the modified driving beams with through holes. Measurement results of electrical characteristics for the trial vibrators indicate that the improved vibrator is about 1/49 times smaller than the conventional one in the equivalent resistance of the driving-mode. Consequently, we found that the newly designed vibrator has higher symmetry and low driving resistance which will make self oscillation easy.

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Lead-free piezo-electric material is promoted to use because of its less influence to the environment. The authors selected, as a lead-free piezo-electric material, LiNbO_3 single crystal which has the high electromechanical coupling coefficient and the advanced high power characteristics, and the authors also have studied the rectangular ultrasonic motor using LiNbO_3. As the results, it has been obtained that this ultrasonic motor can achieve high speed revolution with low electric power and has the possibility of the practical use. Hence, in this study, the square plate ultrasonic motor has been investigated as another type ultrasonic motor. In the piezoelectric ceramics, the equivalent two degenerated vibrations in the square plate have been used because of the easier designing.. In the LiNbO_3 square plate, the equivalent two degenerated vibrations can be also used by selecting the suitable cutting angle. Moreover, since LiNbO_3 is the an-isotropic material, even in the non-resonance frequency range, the degenerated mode-like vibrations have been observed, and the ultrasonic motor operation has been also observed. In this paper, the experimental results which have been obtained from two trial ultrasonic motors using each vibration mode; that is, the degenerated mode or the degenerated mode-like vibrations, respectively.

CiNii Research

researchmap

Language：English  

DOI： 10.1143/JJAP.44.4504

Web of Science

CiNii Research

researchmap

Language：Japanese   Publisher：日本工業出版  

CiNii Research

researchmap

Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

A powder-supplying device using the bending vibration mode of a piezoelectric disk with a two-step cylindrical projection at its center is described. The device has simple structure by which powder on the surface of the vibrator flows out the tip of the projection. Two degeneration modes of BH vibration of the disk were considered. The structure of the vibrator and the vibration mode by FEM are shown. Two kinds of powder were tested in the study, one is fly-ash (D_<p50>=15μm), the others are several kinds of white fused alumina and their powder-supplying characteristics were measured. The results show that the device can supply the powder composed of its particle size smaller than the size of 10 urn at flow rate of less than 1 mg/s.

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：English  

DOI： 10.1143/JJAP.41.3399

Web of Science

researchmap

Language：Japanese   Publisher：日本工業出版  

CiNii Research

researchmap

Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

We investigate the gyro-sensor which is composed of a quartz crystal resonator in order to detect multi-axis angular velocities. In this case, the research point is in the vibration problem of a quartz crystal resonator in three-axis directions. In other words, when such a gyro-sensor is composed concretely, degenertion of multi-resonance modes having vibration freedoms on the three-axis directions is required. In order to make clear this composition condition, we simulated vibrational characteristics of a quartz crystal tuning fork resonator using the ready made FEM software of ANSYS. The result has proved that the couplings among multi-resonance are found due to anisotropic quartz crystal material costants. That is, such couplings can not be avoided when the gyro-sensor to detect multi-axis angular velocities is composed using a quartz crystal resonator, and therefore the realization of such a gyro-sensor has been found not to be easy. This paper deals with FEM simulation results on the construction of such a gyro-sensor using a quartz crystal trident-type tuning fork resonator, and reports some reference deta for construction of a quartz crystal multi-axis gyro-sensor.

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

researchmap

Language：English  

DOI： 10.1143/JJAP.39.3064

Web of Science

researchmap

Language：English  

Web of Science

researchmap

Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：English  

Web of Science

researchmap

Language：English  

DOI： 10.1143/JJAP.37.2859

Web of Science

researchmap

Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

This paper deals with a new construction of vibratory gyro-sensor using a flexural same-form double-mode disk resonator having an additional mass. This vibratory gyro-sensor can be supported at its center of gravity, and it is flatly equipped to meet at right angle to the axis of angular velocity. In the first part of this paper, are described the structure of vibratory gyro-sensor and its principle of operation. The second part contains the experimental result of a prototpe gyro-sensor. The result has proved that the disk-resonator proposed by us surely operated as a gyro-sensor.

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：English  

DOI： 10.1143/JJAP.36.3030

Web of Science

researchmap

Language：Japanese   Publisher：Steering committee of symposium on ultrasonic electronics  

CiNii Research

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

This paper deals with basic experiments for realization of high quality factor of a Piezoelectric vibrator applying negative elements of NIC Circuit. Based upon the method proposed here, the experiments have proved that the quality factor of a piezoelectric ceramic vibrator could be incleased to about 50 times as large as its original one, and moreover, in proportion to inclement of the quality factor, measured displacement of the vibrator has become large.

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap

Language：English  

DOI： 10.1143/JJAP.35.5018

Web of Science

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

researchmap

Language：Japanese  

CiNii Research

researchmap