Driving apparatus, lens driving apparatus and image pickup...

Details Driving apparatus, lens driving apparatus and image pickup... Driving apparatus, lens driving apparatus and image pickup...

Filed on

2011-06-14

Date issued

2011-06-14

Examiner

Rosenau, Derek J (Department: 2837)

Patent Class

Electrical generator or motor structure

SubClass

Non-dynamoelectric

SubSubClass

Piezoelectric elements and devices

Other Related Categories

C310S317000

Type

Reexamination Certificate

Status

active

Patent number

07960898

Description

ABSTRACT:
A driving apparatus comprises an actuator, the actuator comprising an electromechanical conversion element and a driving shaft attached to the electromechanical conversion element, wherein the driving apparatus expands and contracts the electromechanical conversion element by applying a driving signal to the electromechanical conversion element and reciprocally moves the driving shaft in accordance with expansion and contraction movement of the electromechanical conversion element so as to move a driven member frictionally engaged with the driving shaft, and wherein the driving signal is a pulse signal, and a time period corresponding to a half wavelength of a damping vibration displacement of a lowest resonance frequency in the actuator is set as a shorter output time among a high output time period and a low output time period of the driving signal.

REFERENCES:
patent: 6433459 (2002-08-01), Okada
patent: 6483226 (2002-11-01), Okada
patent: 6803699 (2004-10-01), Yuasa et al.
patent: 7564166 (2009-07-01), Onozuka et al.
patent: 2006/0238075 (2006-10-01), Manabe et al.
patent: 3646154 (2005-02-01), None

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