Optical apparatus

Details Optical apparatus Optical apparatus

2010-03-23

2011-11-22

Budd, Mark (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S316010, C310S324000, C310S328000, C310S366000

Reexamination Certificate

active

08063536

ABSTRACT:
An optical apparatus includes a vibrated member and a piezoelectric element. The piezoelectric element vibrates the vibrated member at a predetermined vibration mode to remove a foreign substance adhered to a surface of the vibrated member. A drive electrode, a first vibration detection electrode and a second vibration detection electrode are provided on a first face of the piezoelectric element, and a ground electrode is provided on a second face of the piezoelectric element. The first vibration detection electrode and the second vibration detection electrode have an axis-symmetrical shape, and are arranged on the first face of piezoelectric element so as to be symmetrical with respect to an axis along which a predetermined vibration node occurs when the vibrated member vibrates at the predetermined vibration mode.

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patent: 5136425 (1992-08-01), Fujie et al.
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patent: 7459831 (2008-12-01), Ludwiczak
patent: 2003-333395 (2003-11-01), None

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