Vibration driven motor
January 16, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesVibration wave motor with plural projection vibrator Vibration wave motor Vibration wave motor Vibration motor Vibration wave driven motor Vibration wave motor Vibration wave driven motor Multiple-surface sensor control for a traveling wave motor Vibration wave driven motor Vibration driven motor Patent #: 5406160 InventorAssigneeApplicationNo. 387293 filed on 02/10/1995US Classes:310/323.04, Stator310/323.06Piezoelectric element or electrodeExaminersPrimary: Budd, Mark O.Attorney, Agent or FirmForeign Patent References
International ClassH01L 041/08Foreign Application Priority Data1991-11-12 JPAbstract2n (n is an integer) projections are formed per half wavelength on the driving surface of a vibration member of a disclosed vibration driven motor. The vibration member has an A driving electrode group (A1 to A8) and a B driving electrode group (B1 to B8) polarized at a λ/2 pitch so as to alternately have opposing expansion/contraction polarities with respect to a wavelength λ of a vibration wave to be excited, and λ/4-pitch vibration detection electrodes (SA, SB) and three ground common electrodes (G), which are arranged between the A and B electrode groups. The vibration detection electrodes (SA, SB) are arranged to have substantially loop positions of standing waves generated by the corresponding A and B driving electrode groups as their centers. | |
