Optical apparatus with dust reduction capability

Details Optical apparatus with dust reduction capability Optical apparatus with dust reduction capability

2006-03-02

2009-08-25

Perkey, W. B. (Department: 2862)

Photography

Camera combined with or convertible to diverse art device

C348S335000, C348S340000, C359S507000

Reexamination Certificate

active

07580628

ABSTRACT:
The present invention realizes efficient dust removal in an optical apparatus in such a manner that a single circuit drives a plurality of dust reduction optical elements to vibrate. When the optical elements have different resonance frequencies, it can be configured such that the vibration exciting frequency can be changed in a range including the resonance frequencies of all the optical elements. In this case, the optical element driven can also be switched according to the change in frequency so that only the optical element having a resonance frequency close to the driving frequency will be driven. Alternatively, it can be configured such that the driving time or applied voltage can be changed according to the characteristics of the optical element driven.

REFERENCES:
patent: 7006138 (2006-02-01), Kawai
patent: 2003/0214599 (2003-11-01), Ito et al.
patent: 2004/0047625 (2004-03-01), Ito et al.
patent: 2005/0174467 (2005-08-01), Kawai
patent: 2004-048665 (2004-02-01), None

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