Investigation of Ultrasonic Motors Using Thin Piezo-Ceramics and a Metal Composite-Plate for Watches.

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  • Miyazawa Osamu
    Watch Development & Design Dept., Shiojiri Plant; Seiko Epson Corporation, 390, Shiojiri–machi, Shiojiri–shi, Nagano–ken 399–0796, Japan Graduate Program of Human Sensing and Functional Sensor Engineering Yamagata University, 4–3–1 Jonan, Yonezawa, Yamagata 992–8510 Japan
  • Hashimoto Yasuharu
    Watch Development & Design Dept., Shiojiri Plant; Seiko Epson Corporation, 390, Shiojiri–machi, Shiojiri–shi, Nagano–ken 399–0796, Japan
  • Funasaka Tsukasa
    Material Research Center, Seiko Epson Corporation, 3–3–5 owa, Suwa–shi, Nagano–ken 392–8502, Japan
  • Furuhata Makoto
    Production Development Dept., Seiko Epson Corporation, 1010 Fujimi, Fujimi–machi, Suwa–gun, Nagano–ken 399–0295 Japan

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The authors have developed a 0.4-mm-thick longitudinal bar-type ultrasonic motor for use in watches, using a thin plate stator and a rotor equipped within the same plane. The stator is driven to vibrate length wise by piezo-ceramics oscillated in the first longitudinal mode. The stator then uses a slant projection tooth to pick at the rotor, and drive it. The motor is simply constructed and is easily driven at low voltages. This paper shows that the ultrasonic motor possesses the requisite size and operating characteristics for use in driving the date wheel of a watch.

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