Piezoelectrically driving device
AssigneesHiroshi Shimizu, Matsushita Electric Works, Ltd.
InventorsHiroshi Shimizu, Sumio Sugawara, Takashi Takada, Seiki Ishibashi
Life of this patent
Estimating the term…
Abstract
A piezoelectrically driving device comprises a driving part including paired opposing pole parts substantially square shaped in section, piezoelectric elements provided at least to two adjacent faces of each of the opposing pole parts for causing them to flectionally vibrate resonantly in response to an applied high frequency voltage, and a contact member contactable with one face of each of the opposing pole parts for movement relative thereto or vice versa due to the vibration, any energy loss upon which movement is thereby remarkable restrained and a mechanical driving force can be obtained highly efficiently.
Claims10
A piezoelectrically driving device comprising a vibrator including a base part and a driving part of a flexible material and contacting with a contact member for causing therebetween a relative movement, and a power supply unit for providing a high frequency voltage to said vibrator, wherein said driving part comprises at least one pair of pole parts, each pole part being substantially square shaped in section, joined at one end to the base part of the vibrator and contacting said contact member at one side face, the pair of pole parts being disposed mutually in parallel, and piezoelectric elements disposed on at least two adjacent faces of each of said pair of pole parts, the piezoelectric elements causing said pole parts to resonantly vibrate upon application of said high frequency voltage from said power supply unit to said piezoelectric elements, said high frequency voltage being applied to the piezoelectric elements sequentially with a predetermined phase difference, the pole parts vibrating with a mutual phase difference corresponding to the predetermined phase difference, whereby the pole parts alternately contact the contact member.
Dependencies are inferred from the claim text.