Lens driving device comprising magnetic circuit with high...

Details Lens driving device comprising magnetic circuit with high... Lens driving device comprising magnetic circuit with high...

2009-07-07

2011-12-13

Martinez, Joseph P (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

08077398

ABSTRACT:
A lens driving device includes a lens holder including a tubular portion for holding a lens assembly, a driving coil fixed to the lens holder so as to position around the tubular portion, and a yoke including a permanent magnet opposite to the driving coil. The yoke includes an outer hollow cylindrical portion having a rectangular cylindrical shape, the permanent magnet includes at least four permanent magnet pieces each having a rectangular cross section. Four magnetic circuit auxiliary members are disposed between four corners of the outer hollow cylindrical portion of the yoke and four ones of the permanent magnet pieces that are disposed at the four corners of the outer hollow cylindrical portion of the yoke.

REFERENCES:
patent: 2006/0028320 (2006-02-01), Osaka
patent: 101038361 (2007-09-01), None
patent: 2005-128392 (2005-05-01), None
patent: 2006-220775 (2006-08-01), None
patent: 2006-258969 (2006-09-01), None
patent: 2006-293243 (2006-10-01), None
patent: 2007-121853 (2007-05-01), None
patent: 2007-121853 (2007-05-01), None
patent: 2008-58659 (2008-03-01), None
Extended European Search Report dated Sep. 10, 2009 (6 pages), issued in counterpart European Application No. 09164727.1.

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