The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 2000
Filed:
Apr. 24, 1998
Kenichi Nakajima, Chiba, JP;
Takayuki Satodate, Chiba, JP;
Akihiro Matouge, Chiba, JP;
Akihiko Inada, Chiba, JP;
Mitsuru Ishii, Chiba, JP;
Yoshio Koyama, Chiba, JP;
Shigeo Suzuki, Chiba, JP;
Masayuki Kawata, Chiba, JP;
Yuko Sasaki, Chiba, JP;
Eriko Takakuwa, Chiba, JP;
Seiko Instruments Inc., , JP;
Abstract
A calendar electronic timepiece comprises a signal generating circuit for generating a date signal, a driving circuit for outputting a driving signal in accordance with the date signal generated by the signal generating circuit, and an ultrasonic motor driven by the driving signal outputted by the driving circuit. The ultrasonic motor is comprised of a piezoelectric vibrator having an electrode pattern and being driven by the driving signal outputted from the driving circuit to undergo expansion and contraction movement, a vibrating member connected to the piezoelectric vibrator and vibrationally driven by expansion and contraction movement of the piezoelectric vibrator, and a date dial disposed on the vibrating member to be frictionally driven by expansion and contraction movement of the piezoelectric vibrator.